KR20170044891A - A mesoporous nickel-copper-alumina-zirconia xerogel catalyst prepared by a single-step sol-gel method, preparation method thereof and production method of hydrogen gas by steam reforming of ethanol using said catalyst - Google Patents
A mesoporous nickel-copper-alumina-zirconia xerogel catalyst prepared by a single-step sol-gel method, preparation method thereof and production method of hydrogen gas by steam reforming of ethanol using said catalyst Download PDFInfo
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- KR20170044891A KR20170044891A KR1020150144560A KR20150144560A KR20170044891A KR 20170044891 A KR20170044891 A KR 20170044891A KR 1020150144560 A KR1020150144560 A KR 1020150144560A KR 20150144560 A KR20150144560 A KR 20150144560A KR 20170044891 A KR20170044891 A KR 20170044891A
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- nickel
- copper
- catalyst
- alumina
- ethanol
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 239000003054 catalyst Substances 0.000 title claims abstract description 134
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000629 steam reforming Methods 0.000 title claims abstract description 39
- 238000003980 solgel method Methods 0.000 title abstract description 16
- 238000002360 preparation method Methods 0.000 title description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 117
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 56
- 239000002243 precursor Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 29
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052802 copper Inorganic materials 0.000 claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 17
- 239000012691 Cu precursor Substances 0.000 claims abstract description 11
- 239000011148 porous material Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000013078 crystal Substances 0.000 claims abstract description 4
- -1 epoxide compound Chemical class 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 11
- 238000001666 catalytic steam reforming of ethanol Methods 0.000 claims description 10
- AOPCKOPZYFFEDA-UHFFFAOYSA-N nickel(2+);dinitrate;hexahydrate Chemical group O.O.O.O.O.O.[Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O AOPCKOPZYFFEDA-UHFFFAOYSA-N 0.000 claims description 7
- UJVRJBAUJYZFIX-UHFFFAOYSA-N nitric acid;oxozirconium Chemical compound [Zr]=O.O[N+]([O-])=O.O[N+]([O-])=O UJVRJBAUJYZFIX-UHFFFAOYSA-N 0.000 claims description 7
- XNDZQQSKSQTQQD-UHFFFAOYSA-N 3-methylcyclohex-2-en-1-ol Chemical group CC1=CC(O)CCC1 XNDZQQSKSQTQQD-UHFFFAOYSA-N 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- VMKYLARTXWTBPI-UHFFFAOYSA-N copper;dinitrate;hydrate Chemical compound O.[Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O VMKYLARTXWTBPI-UHFFFAOYSA-N 0.000 claims description 6
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 claims description 6
- 238000006482 condensation reaction Methods 0.000 claims description 5
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 claims description 5
- LQJMXNQEJAVYNB-UHFFFAOYSA-L dibromonickel;hydrate Chemical compound O.Br[Ni]Br LQJMXNQEJAVYNB-UHFFFAOYSA-L 0.000 claims description 4
- LAIZPRYFQUWUBN-UHFFFAOYSA-L nickel chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ni+2] LAIZPRYFQUWUBN-UHFFFAOYSA-L 0.000 claims description 4
- TXBSWQWDLFJQMU-UHFFFAOYSA-N 4-(chloromethyl)-1,2-diethoxybenzene Chemical compound CCOC1=CC=C(CCl)C=C1OCC TXBSWQWDLFJQMU-UHFFFAOYSA-N 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- JGDITNMASUZKPW-UHFFFAOYSA-K aluminium trichloride hexahydrate Chemical compound O.O.O.O.O.O.Cl[Al](Cl)Cl JGDITNMASUZKPW-UHFFFAOYSA-K 0.000 claims description 3
- 229940009861 aluminum chloride hexahydrate Drugs 0.000 claims description 3
- FIQKTHSUXBJBCQ-UHFFFAOYSA-K aluminum;hydrogen phosphate;hydroxide Chemical compound O.[Al+3].[O-]P([O-])([O-])=O FIQKTHSUXBJBCQ-UHFFFAOYSA-K 0.000 claims description 3
- NWFNSTOSIVLCJA-UHFFFAOYSA-L copper;diacetate;hydrate Chemical compound O.[Cu+2].CC([O-])=O.CC([O-])=O NWFNSTOSIVLCJA-UHFFFAOYSA-L 0.000 claims description 3
- SXTLQDJHRPXDSB-UHFFFAOYSA-N copper;dinitrate;trihydrate Chemical compound O.O.O.[Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O SXTLQDJHRPXDSB-UHFFFAOYSA-N 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 229940078487 nickel acetate tetrahydrate Drugs 0.000 claims description 3
- OINIXPNQKAZCRL-UHFFFAOYSA-L nickel(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Ni+2].CC([O-])=O.CC([O-])=O OINIXPNQKAZCRL-UHFFFAOYSA-L 0.000 claims description 3
- MPTQRFCYZCXJFQ-UHFFFAOYSA-L copper(II) chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Cu+2] MPTQRFCYZCXJFQ-UHFFFAOYSA-L 0.000 claims description 2
- 150000002118 epoxides Chemical class 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 abstract description 49
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 49
- 238000006356 dehydrogenation reaction Methods 0.000 abstract description 6
- 150000002431 hydrogen Chemical class 0.000 abstract description 6
- 230000001939 inductive effect Effects 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 230000009467 reduction Effects 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000006297 dehydration reaction Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000001976 improved effect Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000003795 desorption Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 229910000365 copper sulfate Inorganic materials 0.000 description 5
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910000510 noble metal Inorganic materials 0.000 description 5
- 239000000376 reactant Substances 0.000 description 5
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 230000009849 deactivation Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 150000002924 oxiranes Chemical class 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 229910052703 rhodium Inorganic materials 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 3
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000002453 autothermal reforming Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- PBAYDYUZOSNJGU-UHFFFAOYSA-N chelidonic acid Natural products OC(=O)C1=CC(=O)C=C(C(O)=O)O1 PBAYDYUZOSNJGU-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 238000006057 reforming reaction Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012018 catalyst precursor Substances 0.000 description 1
- 230000006324 decarbonylation Effects 0.000 description 1
- 238000006606 decarbonylation reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- B01J35/1061—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
- B01J21/04—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/72—Copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/755—Nickel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/323—Catalytic reaction of gaseous or liquid organic compounds other than hydrocarbons with gasifying agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/16—Preparation of silica xerogels
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Abstract
Description
The present invention relates to a nickel-copper-alumina-zirconia (Xerogel) catalyst prepared by a single-process sol-gel process, a process for preparing the same, and a process for producing hydrogen gas by steam reforming reaction of ethanol using the catalyst. More particularly, the present invention relates to a method for producing a zirconium / aluminum alloy having an atomic ratio of zirconium / aluminum in a range of 0.01 to 1, wherein the zirconium precursor and the aluminum precursor are dissolved in a solution containing alumina- The copper precursor having a copper weight in the range of 0.01 to 10 parts per 100 parts by weight of the support is melted and then an Epoxide compound is added to the mixture to gel and then dried and calcined And the mean pore size is in the range of 2 to 50 nm and the average crystal size of the active nickel is 100 nm or less Medium-porosity nickel-copper-alumina-zirconia zero gel catalyst, to a hydrogen gas production process by the water vapor reforming of the ethanol using a method of manufacturing the same, and the catalyst. When the nickel-copper-alumina-zirconia gel catalyst according to the present invention is used, hydrogen gas can be produced at a higher yield than the nickel-alumina-zirconia gel catalyst without copper.
As global energy demand is highly dependent on fossil fuels and the accompanying environmental problems, interest in the development of alternative energy sources is increasing. Hydrogen energy, which has a high energy density (120.7 kJ / g) and can be obtained not only from pollutants but also from renewable raw materials, is being discussed as a new energy source to replace existing energy supply and demand . The interest in the development of hydrogen energy has increased since the first oil crisis in the 1970s, and the United States has been promoting hydrogen-related technology development programs around the world, such as launching the international organization IPHE. In addition, hydrogen energy is in a trend of increasing demand in petrochemical industry, electronics, materials, semiconductor manufacturing industry, steel industry and aerospace industry, and it is urgent to develop technology to produce hydrogen energy more efficiently.
The reforming reactions for producing hydrogen gas are largely divided into steam reforming, auto-thermal reforming and partial oxidation. The steam reforming reaction is an endothermic reaction in which ethanol reacts with water to produce carbon dioxide and hydrogen. Partial oxidation, on the other hand, is an exothermic reaction in which ethanol is oxidized by oxygen to form carbon dioxide and hydrogen. The autothermal reforming reaction is a reaction in which steam reforming reaction, an endothermic reaction, and partial oxidation reaction, which is an exothermic reaction, are combined and the energy required for reaction can be minimized. The selection of the reforming reaction is based on the yield of hydrogen and the selectivity of carbon monoxide. The steam reforming reaction is mainly used commercially because it has a low selectivity for carbon monoxide as well as a high yield of hydrogen (Non-Patent Document 1).
As a hydrogen energy source, ethanol has the advantage of being easy to store and transport, easy to biodegrade, low in toxicity, and renewable. Therefore, worldwide production of ethanol as a hydrogen energy source is increasing, and ethanol steam reforming reaction is getting popular as hydrogen production technology. In this patent, we designed and manufactured a catalyst system capable of producing hydrogen stably and efficiently through the steam reforming reaction of ethanol.
The reaction pathway in ethanol steam reforming can be classified into ethanol dehydration reaction, ethanol decomposition reaction and ethanol dehydrogenation reaction. The ethanol decomposition reaction is a reaction in which hydrogen and carbon monoxide are separated from ethanol to generate methane, and the subsequent steam reforming of methane It is a reaction that can produce hydrogen through reaction and water gas conversion reaction. The ethanol dehydrogenation reaction is a reaction in which acetaldehyde is produced by separating hydrogen from ethanol, followed by decarbonylation of acetaldehyde and formation of hydrogen through steam reforming reaction. The ethanol dehydration reaction is a reaction in which water is released from ethanol and ethylene is produced. Ethylene produced through this reaction is known as a substance that affects the deactivation of the catalyst by carbon deposition. Therefore, the ethanol dehydration reaction promotes deactivation of the catalyst Reaction. For this reason, it is important to inhibit the ethanol dehydration reaction in the reaction path of the ethanol steam reforming reaction in order to improve the stability and activity of the catalyst.
Known reforming catalysts for the production of hydrogen gas are classified into noble metal catalysts and noble metal catalysts. The noble metal catalysts include rhodium catalysts (Non-Patent Document 2), ruthenium catalysts (Patent Document 1), and platinum catalysts Patent Document 2). Particularly, rhodium is an active metal exhibiting high activity and high hydrogen selectivity in the ethanol steam reforming reaction, and in the case of a catalyst prepared by supporting rhodium on a gamma alumina (γ-Al 2 O 3 ) carrier (Non-Patent Document 2) In the steam reforming reaction, ethanol conversion of 100% and hydrogen selectivity of up to 95% were obtained, but the use of rhodium with a high reaction temperature of 800 K and high production cost is disadvantageous in terms of practical use.
Nickel catalyst systems in non-noble metal catalyst systems are widely used because of their high price competitiveness as well as their high reactivity to dehydrogenation and C-C bond decomposition reactions (Non-Patent Documents 3 and 4). In the case of a catalyst prepared by supporting nickel in lanthanum (Non-Patent Document 5), the selectivity of hydrogen was measured to be as high as 70% at a reaction temperature of 773 K in the ethanol steam reforming reaction, but the ethanol conversion rate was as low as 35% It can be said that it is not easy in point.
On the other hand, studies have been made on nickel catalysts supported on yttria, gamma-alumina and lanthanum carrier as an ethanol steam reforming catalyst composed solely of nickel and a carrier component (Non-Patent Document 6). The study was carried out at a very low temperature of 523 K, and the molar ratio of water vapor to ethanol was set at 3, and the amount of supported nickel was set at 20.6, 16.1 and 15.3 wt%, respectively. The conversion of ethanol was 80% and the selectivity of hydrogen was low at 45%. The results showed that gamma-alumina-supported nickel catalyst showed the highest activity.
The gamma-alumina-supported nickel catalysts are known to exhibit high activity due to the high nickel content due to the high specific surface area of alumina. The molar ratio of water vapor relative to ethanol was 3 and the reaction temperature was 973 K. In the case of the nickel catalyst supported on gamma-alumina (non-patent document 7), the conversion of ethanol was 77% and the hydrogen selectivity was 87% The dehydration reaction which is converted to ethylene mainly occurs due to the high acid property due to the acid sites of alumina, which is disadvantageous in that deactivation by carbon deposition occurs (Non-Patent Document 8). As an improvement method of the nickel catalyst supported on gamma-alumina, improvement of the catalyst stability through the addition of an alkaline earth metal has been studied (Non-Patent Document 9). Alkaline earth metals have the advantage of reducing carbon deposition by dehydration of ethanol by reducing the amount of alumina.
The ethanol steam reforming reaction on a catalyst prepared by adding nickel after supporting alumina with calcium has been studied (Non-Patent Document 10). Among them, 3% by weight of calcium added catalyst showed 100% ethanol conversion and 72% hydrogen yield under the conditions of steam to ethanol molar ratio of 10 and reaction temperature of 673 K, as well as high stability in catalytic activity Respectively. It is considered that the addition of calcium to the catalyst not only suppressed the ethylene production due to the dehydration reaction of the catalyst with ethanol but also improved the water reactivity.
The stability of the catalyst and the reactivity to water can be improved by adding zirconia to the nickel-based catalyst. The steam reforming reaction of ethanol on the catalyst added with zirconia in nickel-alumina has been studied (Patent Document 3).
As described above, the nickel-based catalysts developed until now have been improved in their physico-chemical properties and activity in the ethanol steam reforming reaction through various production methods, but some drawbacks have been pointed out in direct utilization. In order to solve this problem, the present invention proposes a method of preparing a mesoporous nickel-copper-alumina-zirconia gel catalyst having improved activity for ethanol steam reforming reaction as compared with general non-noble metal catalysts.
The present invention provides a method for producing a mesoporous nickel-copper-alumina-zirconia gel catalyst for the production of hydrogen gas by steam reforming reaction of ethanol.
Another object of the present invention is to provide a method for efficiently producing high purity hydrogen gas from the steam reforming reaction of ethanol using the catalyst.
According to an aspect of the present invention, there is provided a process for producing a hydrogen gas by the steam reforming reaction of ethanol, comprising the steps of: mixing a zirconium precursor and an aluminum precursor mixed in an atomic ratio of zirconium / As a support, a nickel precursor mixed with nickel in a range of 5 to 60 parts by weight with respect to 100 parts by weight of the support was melted, and a copper precursor mixed in a range of 0.01 to 10 parts by weight of copper was dissolved in 100 parts by weight of the support. Epoxide ) System compound is added and gelated, followed by drying and firing. The average pore size is in the range of 2 to 50 nm, and the average crystal size of the active nickel is 100 nm or less. Nickel-copper-alumina-zirconia Zerogel catalyst, process for its preparation, and process for preparing It provides a method for producing hydrogen gas by steam reforming of all.
The present invention also relates to a process for preparing a copper alloy, comprising the steps of: i) dissolving an aluminum precursor, a zirconium precursor, a nickel precursor and a copper precursor in an alcohol solvent; Ii) injecting an epoxide-based compound into the solution to cause a hydroxyl group to occur in aluminum, zirconium, nickel and copper in the solution, and to conduct a condensation reaction therebetween to obtain a hybrid gel; Iii) aging the hybrid gel at room temperature; Iv) drying the aged hybrid gel to remove the alcohol solvent; (V) a process for preparing a mesoporous nickel-copper-alumina-zirconia gel catalyst prepared through a single-process sol-gel process for producing hydrogen gas by steam reforming reaction of ethanol, comprising the step of heat treating the dried hybrid gel to provide.
The present invention also relates to a process for preparing the aluminum precursor, wherein the aluminum precursor is selected from the group consisting of Aluminum Nitrate Nonahydrate, Aluminum Chloride Hexahydrate, Aluminum Fluoride Trihydrate, Aluminum Phosphate Hydrate, Wherein the zirconium precursor is at least one selected from the group consisting of Zirconium Chloride, Zirconium Oxynitrate Hydrate and Zirconium Oxychloride precursors, wherein the zirconium precursor is at least one selected from the group consisting of Aluminum Hydroxide, Zirconium Chloride, Zirconium Oxynitrate Hydrate and Zirconium Oxychloride precursor. Wherein the nickel precursor is selected from the group consisting of Nickel Nitrate Hexahydrate, Nickel Chloride Hexahydrate, Wherein the copper precursor is at least one selected from the group consisting of copper nitrate hydrate, copper nitrate trihydrate, copper nitrate hydrate, and nickel bromide hydrate. ) By a single process sol-gel process for the production of hydrogen gas by steam reforming reaction of ethanol, characterized in that it is at least one selected from the group consisting of copper sulfate, copper sulfate, copper sulfate, copper sulfate, copper sulfate and copper acetate hydrate. To provide a process for preparing a mesoporous nickel-copper-alumina-zirconia gel catalyst.
The present invention also relates to a process for the preparation of zeolites having a volume ratio of ethanol / water vapor at a reaction temperature of 300 to 900 ° C in the presence of a mesoporous nickel-copper-alumina-zirconia gel catalyst prepared by a single-process sol- 3 is a flow rate of 1,000 to 500,000 ml / hg of a catalyst. The method for producing hydrogen gas by the steam reforming reaction of ethanol according to the present invention is characterized in that
According to the present invention, the mesoporous nickel-copper-alumina-zirconia gel catalyst (Xerogel) according to the present invention is a catalyst for the production of hydrogen gas by the steam reforming reaction of ethanol, And exhibited improved activity of nickel.
1 is a graph showing the results of measurement of the adsorption capacity of the mesoporous nickel-copper-alumina-zirconia gel catalyst (CNAZ) according to Production Example 1 of the present invention and the nitrogen adsorption of the mesoporous nickel-alumina-zirconia gel catalyst (NAZ) Desorption isotherm graph
FIG. 2 is a graph showing the results of the temperature-dependent reduction (reduction) of the mesoporous nickel-copper-alumina-zirconia gel catalyst (CNAZ) according to Production Example 1 of the present invention and the mesoporous nickel- graph
3 is a graph showing the results of the reduction of the mesoporous nickel-copper-alumina-zirconia gel catalyst (CNAZ) according to Production Example 1 of the present invention and the mesoporous nickel-alumina-zirconia gel catalyst (NAZ) Transmission electron microscope photograph
FIG. 4 is a graph showing the results of measurement of the activity of the mesoporous nickel-copper-alumina-zirconia gel catalyst (CNAZ) according to Production Example 1 of the present invention and the mesoporous nickel- Changes in Hydrogen Yield of Zirconia Zero Gel Catalyst (NAZ)
Hereinafter, the present invention will be described in detail.
The mesoporous nickel-copper-alumina-zirconia Xerogel catalyst prepared by the single-process sol-gel process of the present invention is used for producing hydrogen gas by steam reforming reaction of ethanol.
The mesoporous nickel-copper-alumina-zirconia gel catalyst prepared by the single-process sol-gel method has an atomic ratio of zirconium / aluminum of 0.01 to 1 in view of catalyst activity and economy, more preferably 0.1 to 0.3 If the atomic ratio of zirconium / aluminum is less than 0.01, a large amount of ethylene is produced due to an excessive dehydration reaction, which not only shows a high carbon deposition amount but also exhibits a low reducing property due to strong interaction between alumina and nickel, which is not preferable If it is 1 or more, the surface area of the catalyst is too low and the water gas conversion reaction is not smoothly performed.
The mesoporous nickel-copper-alumina-zirconia gel catalyst prepared by the single-step sol-gel method of the present invention has an alumina-zirconia composite oxide as a carrier and has a nickel weight of 5 to 60 parts by weight per 100 parts by weight of the support. However, it is more preferable that the weight ratio of nickel is less than 5, so that the concentration of nickel is too low on the catalyst so that the number of active sites is small, which is disadvantageous in the production of hydrogen gas. As the positive nickel is aggregated, the particle size becomes large, which is disadvantageous for sintering and carbon deposition, which is not preferable.
The mesoporous nickel-copper-alumina-zirconia gel catalyst prepared by the single-step sol-gel method of the present invention has an alumina-zirconia composite oxide as a carrier and has a copper weight of 0.01 to 10 parts by weight per 100 parts by weight of the support. But it is more preferable that it is in the range of 0.1 to 1. However, if the weight percentage of copper is less than 0.1, the dispersion degree of nickel is low, which is disadvantageous in the production of hydrogen gas. When the weight ratio of copper is more than 1, The ability to adsorb to the reactants is reduced and the selectivity to hydrogen is lowered, which is not preferable.
The mesoporous nickel-copper-alumina-zirconia gel catalyst prepared by the single process sol-gel process of the present invention is characterized in that (i) an aluminum precursor, a zirconium precursor, a nickel precursor and a copper precursor are dissolved in an alcohol solvent step; Ii) injecting an epoxide-based compound into the solution to cause a hydroxyl group to occur in aluminum, zirconium, nickel and copper in the solution, and to conduct a condensation reaction therebetween to obtain a hybrid gel; Iii) aging the hybrid gel at room temperature; Iv) drying the aged hybrid gel to remove the alcohol solvent; (V) preparing a mesoporous nickel-copper-alumina-zirconia gel catalyst by a sol-gel process for preparing hydrogen gas by steam reforming reaction of ethanol, comprising the step of heat treating the dried hybrid gel do.
Examples of the alcohol solvent include alcohols such as methanol, ethanol, propanol, isopropanol, 1-butanol and 2-butanol. Although ethanol is most preferred.
Examples of the aluminum precursor include aluminum nitrate nonahydrate, aluminum chloride hexahydrate, aluminum fluoride trihydrate, aluminum phosphate hydrate, aluminum hydrate, And aluminum hydroxide. It is more preferable to use aluminum nitrate nonahydrate (AlN).
The zirconium precursor is preferably at least one selected from the group consisting of zirconium chloride, zirconium oxynitrate hydrate and zirconium oxychloride precursor, and zirconium oxynitrate hydrate ) Is more preferably used.
The nickel precursor may also be selected from the group consisting of Nickel Nitrate Hexahydrate, Nickel Chloride Hexahydrate, Nickel Acetate Tetrahydrate and Nickel Bromide Hydrate. The nickel precursor may be selected from the group consisting of Nickel Nitrate Hexahydrate, Nickel Chloride Hexahydrate, Nickel Acetate Tetrahydrate and Nickel Bromide Hydrate. It is more preferable to use at least one selected from the group consisting of nickel nitrate hexahydrate and nickel nitrate hexahydrate.
The copper precursor may also be selected from the group consisting of copper nitrate hydrate, copper nitrate trihydrate, copper chloride dihydrate and copper acetate hydrate. And it is more preferable to use one or more kinds of copper nitrate hydrate.
The present invention also relates to a process for the preparation of catalysts for the preparation of catalyst precursors in the presence of mesoporous nickel-copper-alumina-zirconia gel catalysts prepared by a single-process sol-gel process at a reaction temperature of 300-900 ° C in a volume ratio of 1/15 to 1/3 And hydrogen gas is produced from ethanol by flowing ethanol and water vapor at a space velocity of 1,000 to 500,000 ml / g-catalyst h. In the steam reforming reaction, while the temperature of the reactor is maintained at 300-900 ° C, the reaction is performed while flowing ethanol and water vapor together with nitrogen. If the reaction temperature is less than 300 ° C, the temperature is too low, Sufficient catalytic activity can not be expected. If it is 900 o C or higher, deactivation phenomenon due to sintering of nickel, which is an active phase, occurs at a high temperature, which is not preferable. If the volume ratio of ethanol / water vapor as the reactant is less than 1/15, the amount of ethanol is too small, so that the amount of ethanol / It is difficult to evaluate the activity. If the volume ratio is more than 1/3, the selectivity of methane and carbon monoxide due to the steam reforming reaction becomes high, which is not efficient.
The hydrogen gas production method includes a pretreatment step of reducing the gel catalyst of mesoporous nickel-copper-alumina-zirconia gel prepared by a single-process sol-gel method filled in the reactor before the reaction to a mixed gas of nitrogen and hydrogen. In general, in the steam reforming reaction of ethanol, since the active phase is a nickel species that is not a nickel oxidation species but a reduced nickel species, it is preferable that all nickel-based catalysts undergo a pretreatment process in which hydrogen is used for reduction before the reaction is carried out. Particularly, it is preferable that the volume ratio of hydrogen / nitrogen used in the pretreatment process is 1/10 to 1/2. When the volume ratio is less than 1/10, the amount of hydrogen required for reduction of nickel is small, It is difficult to expect a high activity, and when it is more than 1/2, the amount of hydrogen required for reduction exceeds the amount of hydrogen, which is not economical.
Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
Manufacturing example One. Medium porosity Nickel-copper-alumina- Zirconia Zero Gel ( Xerogel ) Preparation of Catalyst
Ethanol (Fisher product) was used as the alcohol solvent in this Production Example 1, and aluminum precursor was aluminum nitrate nonahydrate (product of Junsei), zirconium oxynitrate hydrate (zirconium oxynitrate hydrate (Aldrich), Copper nitrate hydrate (Aldrich) as a copper precursor, and Nickel nitrate hexahydrate (Aldrich) as a nickel precursor were added to dissolve the metal precursor Hydrochloric acid (product of Samchun) was used as the acid solution. First, 6.0 g of an aluminum precursor and 0.93 g of a zirconium precursor were added to 30 ml of an ethanol solvent, and 3 ml of hydrochloric acid was added thereto, followed by stirring for 3 hours so as to be dissolved sufficiently. Then, 0.97 g of the nickel precursor and 0.01 g of the copper precursor were dissolved in the solution, and then 15 ml of propylene oxide (product of Acros) was gradually added to induce the condensation reaction between the metal ions. The solution was further stirred for 20 minutes to obtain a blue opaque nickel-copper-alumina-zirconia hybrid gel. The resulting nickel-copper-alumina-zirconia hybrid gel was aged at room temperature for 2 days. Thereafter, the aged gel was placed in an oven at 80 ° C and dried for 5 days to obtain a gel (Xerogel) of medium-porosity nickel-copper-alumina-zirconia. The nickel-copper-alumina-zirconia gel thus obtained was heat-treated at 550 ° C. for 5 hours in an air atmosphere using an electric furnace, and finally, a medium-sized porous nickel-copper-alumina-zirconia The gel catalyst was obtained and named CNAZ.
Comparative Example One. Medium porosity Nickel-alumina- Zirconia Zero Gel ( Xerogel ) Preparation of Catalyst
The alcohol solvent, the aluminum precursor, the zirconium precursor, the nickel precursor, the acid solution and the epoxide-based compound used in Comparative Example 1 are the same as those used in Production Example 1 above. First, 6.0 g of an aluminum precursor and 0.93 g of a zirconium precursor were added to 30 ml of an ethanol solvent, and 3 ml of hydrochloric acid was added thereto, followed by stirring for 3 hours so as to be dissolved sufficiently. After dissolving 0.97 g of the nickel precursor in the solution, 15 ml of propylene oxide (product of Acros) was slowly added to induce a condensation reaction between the metal ions. The solution was further stirred for 20 minutes to obtain a blue opaque nickel-alumina-zirconia hybrid gel (Gel), and the resulting nickel-alumina-zirconia hybrid gel was aged at room temperature for 2 days. Then, the aged gel was placed in an oven at 80 ° C and dried for 5 days to obtain a gel of medium-porosity nickel-alumina-zirconia (Xerogel). The thus obtained nickel-alumina-zirconia gel was heat-treated at 550 ° C. for 5 hours in an air atmosphere using an electric furnace to finally obtain a gel catalyst of medium-porosity nickel-alumina-zirconia prepared by a single-process sol- This was named NAZ.
1 is a graph showing the results of measurement of the adsorption capacity of the mesoporous nickel-copper-alumina-zirconia gel catalyst (CNAZ) according to Production Example 1 of the present invention and the nitrogen adsorption of the mesoporous nickel-alumina-zirconia gel catalyst (NAZ) Desorption isotherm. As can be seen from FIG. 1, the NAZ and CNAZ catalysts exhibit IV-type adsorption / desorption curves and H2-type hysteresis loops, indicating that the medium-sized, ink- It can be seen that a porous structure is formed.
Table 1 shows the composition and physical properties of the CNAZ and NAZ catalysts according to Preparation Example 1 and Comparative Example 1, respectively. In both CNAZ and NAZ catalysts prepared from Table 1, a high specific surface area of more than 240 m 2 g -1 was observed and the average pore size was about 6.0 nm. It was confirmed that the mesoporous structure was formed in the CNAZ and NAZ catalysts, and the physical properties of the two catalysts were similar.
FIG. 2 is a graph showing the results of the temperature-dependent reduction (reduction) of the mesoporous nickel-copper-alumina-zirconia gel catalyst (CNAZ) according to Production Example 1 of the present invention and the mesoporous nickel- FIG. As a result, both catalysts exhibited a single peak near 600 ° C, which corresponds to the reduction peak of nickel oxide interacting with the alumina-zirconia composite carrier. The reduction peak on the CNAZ catalyst was observed at a lower temperature than the NAZ catalyst, indicating that the added copper promoted the reduction of nickel species by transferring hydrogen to nickel in the reduction process.
3 is an enlarged photograph of a CNAZ catalyst according to Production Example 1 of the present invention and a state after reduction of the NAZ catalyst according to Comparative Example 1 by a transmission electron microscope. FIG. 3 shows that nickel particles are more uniformly distributed on the CNAZ catalyst.
Table 2 shows the hydrogen-elevated temperature desorption analysis results of the CNAZ and NAZ catalysts according to Production Example 1 and Comparative Example 1. Compared with the NAZ catalyst, the CNAZ catalyst showed a higher value than the NAZ catalyst because the added copper improved dispersibility of nickel by acting as dispersant. Calculating the nickel active surface area using the amount of hydrogen desorption in the hydrogen-temperature desorption analysis shows that the CNAZ catalyst has a higher nickel active surface area than the NAZ catalyst. Therefore, it can be predicted that CNAZ catalyst shows higher activity than NAZ catalyst in the steam reforming reaction of ethanol from the above.
Example One. Medium porosity Nickel-copper-alumina- Zirconia Zero Gel ( Xerogel Characteristics of Steam Reforming of Ethanol Using Catalysts
The hydrogen gas production reaction by the steam reforming reaction of ethanol was carried out using the CNAZ and NAZ catalysts prepared in Production Example 1 and Comparative Example 1. The catalyst was packed in a quartz reactor for the steam reforming reaction of ethanol and a reduction process was performed to activate the catalyst prior to the reaction. In the reduction process, the mixed gas of nitrogen and hydrogen at 30 ml / min and 3 ml / min was passed through the catalyst layer, and the temperature of the reactor was set at 650 ° C for 3 hours. Thereafter, the temperature of the reactor was lowered to 450 ° C, and the steam reforming reaction was carried out by passing the reactants, ethanol and water vapor, through the catalyst bed. At this time, the volume ratio of ethanol to steam was maintained at 1/6, and the gas hourly space velocity (GHSV) of the reactant was maintained at 28,280 ml / hg-catalyst. In this example, the conversion of ethanol, the yield of hydrogen, and the selectivity of the product were calculated by the following equations (1), (2) and (3), respectively. In Equation (3), x denotes the number of carbons contained in the compound.
(1)
(2)
(3)
FIG. 4 is a graph showing changes in hydrogen yields of CNAZ and NAZ catalysts according to Production Example 1 and Comparative Example 1 of the present invention with respect to reaction time. The CNAZ catalyst showed improved hydrogen yield and stability compared to the NAZ catalyst in the steam reforming of ethanol for 1000 minutes. This shows that the addition of copper acts as a dispersant to improve the activity of the catalyst by enhancing the dispersibility of nickel.
Table 3 shows the ethanol conversion, hydrogen yield and product selectivity of the CNAZ and NAZ catalysts in the steam reforming reaction of ethanol after 1000 minutes. Both catalysts showed 100% ethanol conversion and stable hydrogen yield without significant inactivation. Through this, not only the mass transfer of the reactant and the product is smoothly performed by the mesopores developed in the catalyst, but also it can be deduced that the active phase stably exists during the reaction time. The CNAZ catalyst showed higher hydrogen yield and lower methane selectivity than the NAZ catalyst, indicating that copper added on the CNAZ catalyst enhanced ethanol selectivity by inducing ethanol dehydrogenation over the ethanolic steam reforming reaction .
In conclusion, according to the present invention, the mesoporous nickel-copper-alumina-zirconia gel catalyst produced by the single-process sol-gel method showed higher nickel dispersion than the gel catalyst of nickel-alumina-zirconia, It is a very effective catalyst in the hydrogen gas production process through the steam reforming reaction of ethanol because it increases the yield of hydrogen by inducing dehydrogenation reaction.
The embodiments of the present invention described above should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.
Claims (8)
Wherein the average pore is 2 to 50 nm and the average crystal size of nickel is 100 nm or less.
Ii) introducing an epoxide-based compound into the solution of step i) to cause a hydroxyl group to occur in aluminum, zirconium, nickel and copper in the solution, and to conduct a condensation reaction therebetween to obtain a hybrid gel step;
Iii) aging the hybrid gel of step ii) at room temperature;
Iv) drying the aged hybrid gel of step iii) to remove the alcohol solvent;
And (v) a step of heat-treating the dried hybrid gel obtained in step (iv) to prepare a medium-porosity nickel-copper-alumina-zirconia catalyst for producing hydrogen gas by steam reforming reaction of ethanol.
Wherein the aluminum precursor is selected from the group consisting of Aluminum Nitrate Nonahydrate, Aluminum Chloride Hexahydrate, Aluminum Fluoride Trihydrate, Aluminum Phosphate Hydrate and Aluminum Hydroxide Wherein the catalyst is at least one selected from the group consisting of aluminum hydroxide and aluminum hydroxide.
Characterized in that the zirconium precursor is at least one selected from the group consisting of zirconium chloride, zirconium oxynitrate hydrate and zirconium oxychloride precursors, wherein the zirconium precursor is at least one selected from the group consisting of zirconium chlorides, zirconium chlorides, zirconium oxynitrate hydrates and zirconium oxychloride precursors. ≪ / RTI >
Wherein the nickel precursor is selected from the group consisting of Nickel Nitrate Hexahydrate, Nickel Chloride Hexahydrate, Nickel Acetate Tetrahydrate, and Nickel Bromide Hydrate. By weight based on the total weight of the nickel-copper-alumina-zirconia catalyst.
The copper precursor may be one selected from the group consisting of copper nitrate hydrate, copper nitrate trihydrate, copper chloride dihydrate and copper acetate hydrate. By weight based on the total weight of the nickel-copper-alumina-zirconia catalyst.
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