CN109395782A - A kind of nano Pd catalyst of composite carrier load and preparation method thereof and the application in CO oxidation - Google Patents
A kind of nano Pd catalyst of composite carrier load and preparation method thereof and the application in CO oxidation Download PDFInfo
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- CN109395782A CN109395782A CN201811202025.4A CN201811202025A CN109395782A CN 109395782 A CN109395782 A CN 109395782A CN 201811202025 A CN201811202025 A CN 201811202025A CN 109395782 A CN109395782 A CN 109395782A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 14
- 230000003647 oxidation Effects 0.000 title claims abstract description 13
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 44
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 34
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 34
- 239000000243 solution Substances 0.000 claims abstract description 32
- 229910001507 metal halide Inorganic materials 0.000 claims abstract description 20
- 150000005309 metal halides Chemical class 0.000 claims abstract description 20
- 150000002940 palladium Chemical class 0.000 claims abstract description 18
- 150000003839 salts Chemical class 0.000 claims abstract description 17
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000001913 cellulose Substances 0.000 claims abstract description 15
- 229920002678 cellulose Polymers 0.000 claims abstract description 15
- 238000002425 crystallisation Methods 0.000 claims abstract description 13
- 230000008025 crystallization Effects 0.000 claims abstract description 13
- 239000012266 salt solution Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 13
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 13
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 13
- 239000012279 sodium borohydride Substances 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 229910052763 palladium Inorganic materials 0.000 claims description 12
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 claims description 3
- 239000011592 zinc chloride Substances 0.000 claims description 3
- 235000005074 zinc chloride Nutrition 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000006185 dispersion Substances 0.000 abstract description 8
- 239000001257 hydrogen Substances 0.000 abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 150000002941 palladium compounds Chemical class 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
- 238000006722 reduction reaction Methods 0.000 description 13
- 229910052759 nickel Inorganic materials 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000000975 co-precipitation Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 230000008030 elimination Effects 0.000 description 5
- 238000003379 elimination reaction Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 101150116295 CAT2 gene Proteins 0.000 description 2
- 101100392078 Caenorhabditis elegans cat-4 gene Proteins 0.000 description 2
- 101100326920 Caenorhabditis elegans ctl-1 gene Proteins 0.000 description 2
- 101100494773 Caenorhabditis elegans ctl-2 gene Proteins 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 101100112369 Fasciola hepatica Cat-1 gene Proteins 0.000 description 2
- 101100005271 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cat-1 gene Proteins 0.000 description 2
- 101100126846 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) katG gene Proteins 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- 101100005280 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cat-3 gene Proteins 0.000 description 1
- 101150019148 Slc7a3 gene Proteins 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000026030 halogenation Effects 0.000 description 1
- 238000005658 halogenation reaction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000006197 hydroboration reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- -1 zinc halide Chemical class 0.000 description 1
Classifications
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/28—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/20—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state
- B01J35/23—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state in a colloidal state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/396—Distribution of the active metal ingredient
- B01J35/399—Distribution of the active metal ingredient homogeneously throughout the support particle
-
- 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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/16—Reducing
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/22—Carbon dioxide
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/502—Carbon monoxide
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses nano Pd catalysts of a kind of composite carrier load and its preparation method and application, and the preparation method comprises the following steps: (1) taking Al2O3It is mixed with water, metal halide ultrasonic disperse is added, adds cellulose, ultrasonic disperse obtains mixed liquor；(2) carbonate solution is added in the mixed liquor of step (1), mixing, is dried after crystallization, obtains complex carrier；(3) complex carrier in step (2) is impregnated in palladium salt solution, adjusts the pH to 7-10 of solution, borohydride salts are added, are mixed and dried.The preparation method improves the absorption dispersion of palladium compound and stablizes；High-temperature roasting and high-temperature hydrogen reduction link are avoided, the thermal stability of Pd species is improved.The preparation method is simple, easily controllable, application value with higher, and the catalyst shows excellent CO low-temperature oxidation and eliminates performance.
Description
Technical field
The present invention relates to nano Pd catalysts, and in particular, to a kind of nano Pd catalyst of composite carrier load and its
Preparation method and the application in CO oxidation.
Background technique
With the consumption of the expansion development and fossil energy of modern industry, problem of environmental pollution is on the rise.It is wherein industrial
The harm of hydrocarbon environmental pollution is concerned in exhaust gas, communications and transportation exhaust and coal mine tunnel, especially CO's
It eliminates.CO is colourless, odorless, poisonous gas, and toxicity is extremely strong, serious to the harm of human health.Currently, the elimination to CO
Mainly by physics null method and chemical null method.Physics null method is primarily referred to as right using some porous masses (such as active carbon)
CO is adsorbed, and to reduce the aerial residual of CO, but is difficult to select suitable adsorbent material, and since adsorption efficiency is low
Cause equipment volume big, therefore the application of the method is restricted.And chemical null method mainly includes catalytic reduction method and catalysis oxygen
Change method makes O in CO and air wherein the elimination best way to low concentration CO is catalytic oxidation2Reaction generates avirulent
CO2.However, the aerial burning point of CO is 700 DEG C, thus catalyst must be used to realize and aoxidize elimination under low temperature.It is this kind of to urge
Agent is mainly with noble metal (Pd, Pt, Rh and Au) for active component.And it is often more complicated for the mode of rugged catalyst,
Such as package or template, manufacturing cycle is longer, and technique is relatively complicated.
Thus, it is most important that high performance nano Pd catalyst is prepared using straightforward procedure.
Summary of the invention
The object of the present invention is to provide nano Pd catalyst of a kind of composite carrier load and preparation method thereof and in CO oxygen
Application in change, the nano Pd catalyst is by being supported on Al for palladium compound2O3It is made on complex carrier, (1) this method passes through
Metal halide is implanted to carrier Al using coprecipitation2O3In structure；(2) by cellulose to compound Al2O3Carrier changes
Property, improve Al2O3The surface group characteristic of carrier improves the absorption dispersion of palladium compound and stablizes；(3) sodium borohydride is utilized
Low-temperature reduction, avoid high-temperature roasting and high-temperature hydrogen reduction link, improve the thermal stability of Pd species.The preparation method
Simply, easily controllable, application value with higher, and the catalyst shows the excellent CO low-temperature oxidation property eliminated
Energy.
To achieve the goals above, the present invention provides a kind of preparation sides of the nano Pd catalyst of composite carrier load
Method, the preparation method comprises the following steps: (1) taking Al2O3It is mixed with water, metal halide ultrasonic disperse is added, adds fibre
Dimension element, ultrasonic disperse obtain mixed liquor；(2) carbonate solution is added in the mixed liquor of step (1), mixing, is dried after crystallization,
Obtain complex carrier；(3) complex carrier in step (2) is impregnated in palladium salt solution, adjusts the pH to 7-10 of solution, boron is added
Salt is hydrogenated, is mixed and dried.
The present invention also provides a kind of Technique of Nano Pd of composite carrier load being prepared according to previously described preparation method
Catalyst.
Moreover, the present invention also provides a kind of nano Pd catalysts of previously described composite carrier load aoxidizes in CO
In application.
Through the above technical solutions, (1) present invention is by being implanted to carrier Al for metal halide using coprecipitation2O3
In structure, effectively change Al2O3With the mode of action of metal oxide, the electronics of carrier is activated to enliven ability；(2) by fiber
Element is to compound Al2O3The modification of carrier, improves Al2O3The surface group characteristic of carrier, improve palladium compound absorption dispersion with
Stablize；(3) low-temperature reduction for utilizing sodium borohydride, avoids high-temperature roasting and high-temperature hydrogen reduction link, improves Pd species
Thermal stability.The preparation method is simple, easily controllable, application value with higher, and the catalyst show it is excellent
Different CO low-temperature oxidation eliminates performance.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the transmission electron microscope picture of catalyst in embodiment 7；
Fig. 2 is that catalyst aoxidizes elimination performance map to CO in embodiment 7.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
To achieve the goals above, the present invention provides a kind of preparation sides of the nano Pd catalyst of composite carrier load
Method, the preparation method comprises the following steps: (1) taking Al2O3It is mixed with water, metal halide ultrasonic disperse is added, adds fibre
Dimension element, ultrasonic disperse obtain mixed liquor；(2) carbonate solution is added in the mixed liquor of step (1), mixing, is dried after crystallization,
Obtain complex carrier；(3) complex carrier in step (2) is impregnated in palladium salt solution, adjusts the pH to 7-10 of solution, boron is added
Salt is hydrogenated, is mixed and dried.
Through the above technical solutions, the present invention is by being implanted to carrier Al for metal halide using coprecipitation2O3Structure
In, effectively change Al2O3With the mode of action of metal oxide, the electronics of carrier is activated to enliven ability；(2) by cellulose pair
Compound Al2O3The modification of carrier, improves Al2O3The surface group characteristic of carrier, improve the absorption dispersion of palladium compound with it is steady
It is fixed；(3) low-temperature reduction for utilizing sodium borohydride, avoids high-temperature roasting and high-temperature hydrogen reduction link, improves Pd species
Thermal stability.The preparation method is simple, easily controllable, application value with higher, and the catalyst show it is excellent
CO low-temperature oxidation eliminate performance.
It for the dosage and adding proportion of each raw material, can be selected in a wider range, of the invention a kind of preferred
In embodiment, in order to which metal halide is implanted into Al2O3On carrier, eliminating to CO low-temperature oxidation for catalyst is further increased
Performance, in a kind of preferred embodiment of the present invention, Al2O3In Al element, metallic element and carbonic acid in metal halide
The ratio between amount of substance of salt is 3-20:1:0.9-1.1.
In a kind of preferred embodiment of the present invention, in order to which that improves catalyst eliminates performance, phase to CO low-temperature oxidation
For the complex carrier in 10g step (2), the mass content of palladium element is 0.01-0.5g in palladium salt solution.
For cellulose, the dosage of water and borohydride salts, can be selected in a wider range in step (1), be terrible
To epigranular, the catalyst of the low-temperature catalyzed better performances of CO, in a kind of preferred embodiment of the present invention, relative to
The Al of 10g2O3, the dosage of cellulose is 0.1-2g, and the dosage of water is 10-20mL in step (1)；Relative in 10g step (2)
Complex carrier, the dosages of borohydride salts is 0.5-6.0mmol for the volume of carbonate solution, can be carried out in a wider range
Selection, epigranular in order to obtain, the catalyst of the low-temperature catalyzed better performances of CO, in a kind of preferred embodiment of the present invention
In, the volume ratio of water and carbonate solution in step (1) is 1:0.8-1.2.
It for the volume of palladium salt solution, can be selected in a wider range, in order to obtain epigranular, CO is low-temperature catalyzed
The catalyst of better performances, in a kind of preferred embodiment of the present invention, relative to the complex carrier in 10g step (2),
The volume of palladium salt solution is 10-20mL.
For the condition of crystallization in step (2), can be selected in a wider range, in order to obtain epigranular, CO is low
The warm preferable catalyst of catalytic performance, it is preferable that the temperature of crystallization is 60-100 DEG C in step (2).
For the condition of crystallization in step (2), can be selected in a wider range, in order to obtain epigranular, CO is low
The warm preferable catalyst of catalytic performance, it is preferable that the crystallization time in step (2) is 6-24h.
For the condition mixed in step (3), can be selected in a wider range, in order to obtain the low-temperature catalyzed performance of CO
Preferable catalyst, it is preferable that the mixing temperature after borohydride salts are added in step (3) is 20-80 DEG C.
For the condition mixed in step (3), can be selected in a wider range, in order to obtain the low-temperature catalyzed performance of CO
Preferable catalyst, it is preferable that incorporation time 5-24h.
It for metal halide, can be selected in a wider range, the low-temperature catalyzed better performances of CO are urged in order to obtain
Agent, it is preferable that metal halide is one of nickel halogenide, halogenation cobalt and zinc halide or a variety of；It is further preferred that metal
Halide is one of nickel chloride, cobalt chloride and zinc chloride or a variety of.
It for carbonate, can be selected in a wider range, in order to obtain the catalyst of the low-temperature catalyzed better performances of CO,
Preferably, carbonate is water-soluble carbonate, it is further preferred that carbonate is sodium carbonate and/or potassium carbonate.
It for palladium salt, can be selected in a wider range, the catalyst of the low-temperature catalyzed better performances of CO, excellent in order to obtain
Selection of land, palladium salt is water-soluble palladium salt, it is further preferred that palladium salt is one of palladium chloride, palladium nitrate and palladium acetate or a variety of.
It for borohydride salts, can be selected in a wider range, in order to obtain the catalysis of the low-temperature catalyzed better performances of CO
Agent, it is preferable that borohydride salts are water-soluble borohydride salts, it is further preferred that borohydride salts are sodium borohydride and/or hydroboration
Potassium.
In the above-mentioned technical solutions, for Al2O3Can there are many selection, for example, it may be acidic alumina, can also be with
It is alkalinity or neutral alumina, is therefore further to be conducive to the dissolution of metal halide under acidic or neutral conditions
The step of adjusting acidity is reduced, in a kind of preferred embodiment of the present invention, for Al2O3Raw material selection, preferably
Acid Al2O3.Further, in order to be conducive to Al2O3Dispersion and metal halide co-precipitation, it is preferable that Al2O3Granularity
Range is selected below 200 mesh, and in a kind of preferred embodiment of the present invention, selection is commercial, 100-200 mesh acidity Al2O3。
In the above-mentioned technical solutions, there are many adding speeds and mode of carbonate solution, addition can disposably be toppled over
In the mixed liquor of step (1), the mode that dropwise addition can also be used is added in the mixed liquor of step (1), of the invention a kind of preferred
In embodiment, even-grained catalyst in order to obtain, it is preferable that carried out by the way of being added dropwise.
In the above-mentioned technical solutions, the frequency of ultrasonic disperse can be selected in a wider range, such as 20-60kHz,
Even-grained catalyst can be obtained, in the following embodiment of the present invention, supersonic frequency 40kHz.
In the above-mentioned technical solutions, for the hybrid mode in step (2), can there are many selections, such as stir, shake
It shakes, the present invention can be achieved in concussion etc., and details are not described herein.
In the above-mentioned technical solutions, it in step (2), for the product after crystallization, can directly dry, also washable middle neutrality
After dry, as intermediate product, will not influence the generation of the final product of the present invention.
Selection for reactor can take various forms, such as beaker, flask, reaction kettle etc., of the invention a kind of
In preferred embodiment, reaction kettle is selected.And in step (3), it is preferable that the mixing step after borohydride salts are added
In, reaction process carries out under conditions of reaction kettle seals.
For the product in step (3), it can directly dry and be used as catalyst, be washed to neutrality before can also drying again,
Then drying uses, and all has in good catalytic effect, then a kind of preferred embodiment of the invention, and selection is washed to
Property, then the mode dried carry out.
In the above-mentioned technical solutions, there are many modes that the pH of solution is adjusted in step (3), such as can add a small amount of salt
Acid solutions such as acid, nitric acid, citric acid etc., or a small amount of lye etc. is added dropwise, the adjusting for pH belongs to the conventional skill of this field
Art means, details are not described herein.
The present invention also provides a kind of Technique of Nano Pd of composite carrier load being prepared according to previously described preparation method
Catalyst.
Through the above technical solutions, the present invention is by being implanted to carrier Al for metal halide using coprecipitation2O3Structure
In, effectively change Al2O3With the mode of action of metal oxide, the electronics of carrier is activated to enliven ability；(2) by cellulose pair
Compound Al2O3The modification of carrier, improves Al2O3The surface group characteristic of carrier, improve the absorption dispersion of palladium compound with it is steady
It is fixed；(3) low-temperature reduction for utilizing sodium borohydride, avoids high-temperature roasting and high-temperature hydrogen reduction link, improves Pd species
Thermal stability.The preparation method is simple, easily controllable, application value with higher, and the catalyst show it is excellent
CO low-temperature oxidation eliminate performance.
Moreover, the present invention also provides a kind of nano Pd catalysts of previously described composite carrier load aoxidizes in CO
In application.
Through the above technical solutions, the present invention is by being implanted to carrier Al for metal halide using coprecipitation2O3Structure
In, effectively change Al2O3With the mode of action of metal oxide, the electronics of carrier is activated to enliven ability；(2) by cellulose pair
Compound Al2O3The modification of carrier, improves Al2O3The surface group characteristic of carrier, improve the absorption dispersion of palladium compound with it is steady
It is fixed；(3) low-temperature reduction for utilizing sodium borohydride, avoids high-temperature roasting and high-temperature hydrogen reduction link, improves Pd species
Thermal stability.The preparation method is simple, easily controllable, application value with higher, and the catalyst show it is excellent
CO low-temperature oxidation eliminate performance.
The present invention will be described in detail by way of examples below.
Embodiment 1
1.7g sodium carbonate is weighed, is completely dissolved in 15g water, sodium carbonate liquor is obtained, it is spare.
Weigh 16.5g acidity Al2O3(commercial, 100-200 mesh) mixes with 16.5g water to be placed in reaction kettle, is added
Then 3.8g nickel chloride, ultrasonic disperse 10min add 0.4g cellulose again, after abundant ultrasonic disperse, then above-mentioned carbon is gradually added dropwise
Acid sodium solution stirs, and the crystallization 10h at 80 DEG C is washed to neutrality later, spare after drying, obtains nickel doping
Al2O3Complex carrier, Al and Ni molar ratio be 10:1, be denoted as A.
Weigh the above-mentioned Al of 10g2O3Complex carrier be impregnated in 17mL palladium concentration be 10mg/ml palladium chloride solution in (control
The load capacity for making Pd in dry rear catalyst is 1%), to adjust the pH to 8 of solution, adds 0.8g sodium borohydride, seals, 40
10h is stirred at DEG C, is washed to neutrality, is placed in drier, drying at room temperature obtains 1%Pd/A-C catalyst, is denoted as Cat 1.
Embodiment 2
Implementation steps and condition only adjust the additive amount of nickel chloride with embodiment 1, i.e. addition 12.5g nickel chloride, i.e., will
Al and Ni molar ratio is adjusted to 3:1, is denoted as B, obtains 1%Pd/B-C catalyst, is denoted as Cat 2.
Embodiment 3
Implementation steps and condition are with embodiment 2, and only palladium chloride is adjusted to palladium acetate, obtain 1%PdC/B-C catalyst,
It is denoted as Cat3.
Embodiment 4
Implementation steps and condition are with embodiment 2, and only palladium chloride is adjusted to nitric acid acid palladium, obtain 1%PdN/B-C catalysis
Agent is denoted as Cat4.
Embodiment 5
Implementation steps and condition only adjust the additive amount of palladium chloride, Pd load capacity are adjusted to 0.5%, is obtained with embodiment 2
To 0.5%Pd/B-C1 catalyst, it is denoted as Cat 5.
Embodiment 6
Cellulose additive amount is only adjusted to 2.0g with embodiment 2 by implementation steps and condition, obtains 1%Pd/B-C2 catalysis
Agent is denoted as Cat 6.
Embodiment 7
Implementation steps and condition only adjust the additive amount of nickel chloride with embodiment 1, i.e. addition 2.0g nickel chloride, i.e., will
Al and Ni molar ratio is adjusted to 20:1, is denoted as C, obtains 1%Pd/C-C catalyst, is denoted as Cat 7.The transmission electricity of catalyst particle size
Mirror figure, as shown in Figure 1.
As seen from Figure 1, palladium grain diameter is small in catalyst, and is dispersed on carrier.According to the method in application examples 1
CO conversion ratio under different temperatures is detected, as a result sees Fig. 2.
Embodiment 8
Implementation steps and condition only adjust the additive amount of palladium chloride with embodiment 2, Pd load capacity are adjusted to 0.5%, fibre
It ties up plain additive amount and is adjusted to 0.8g, obtain 0.5%Pd/C-C0 catalyst, be denoted as Cat 8.
Embodiment 9
Implementation steps are in the same manner as in Example 2, nickel chloride are only adjusted to cobalt chloride, and Al and Co molar ratio is adjusted
For 3:1, catalyst is obtained, is denoted as Cat 9.
Embodiment 10
Implementation steps are in the same manner as in Example 2, nickel chloride are only adjusted to zinc chloride, and Al and Zn molar ratio is adjusted
For 3:1, catalyst is obtained, is denoted as Cat 10.
Embodiment 11
(1) 10g Al is taken2O3It is mixed with 10mL water, nickel chloride ultrasonic disperse is added, add 0.1g cellulose, ultrasound point
It dissipates, obtains mixed liquor；
(2) 8mL carbonate solution is added in the mixed liquor of step (1), mixing, after 60-100 DEG C of stirring 6-24h crystallization
Drying, obtains complex carrier；
Wherein, Al2O3In Al element, the nickel element in nickel chloride and sodium carbonate the ratio between the amount of substance be 3:1:0.9,
(3) it takes the complex carrier in 10g step (2) to be impregnated in 15mL palladium salt solution, adjusts the pH to 10 of solution, be added
0.01mol sodium borohydride, for 24 hours in 20 DEG C of mixing, drying, wherein the mass content of palladium element is 0.01g in palladium salt solution.?
To catalyst, it is denoted as Cat 11.
Embodiment 12
(1) 10g Al is taken2O3It is mixed with 20mL water, nickel chloride ultrasonic disperse is added, adds 2g cellulose, ultrasonic disperse,
Obtain mixed liquor；
(2) 24mL carbonate solution is added in the mixed liquor of step (1), mixing, is dried after 100 DEG C of stirring 6h crystallization,
Obtain complex carrier；
Wherein, Al2O3In Al element, the nickel element in nickel chloride and sodium carbonate the ratio between the amount of substance be 20:1:1.1,
(3) it takes the complex carrier in 10g step (2) to be impregnated in 10mL palladium salt solution, adjusts the pH to 8 of solution, be added
0.05mol sodium borohydride, in 80 DEG C of mixing 5h, drying, wherein the mass content of palladium element is 0.5g in palladium salt solution.It obtains
Catalyst is denoted as Cat 12.
Comparative example 1
Implementation steps and condition do not add sodium borohydride only, obtain catalyst, be denoted as Cat-D1 with embodiment 2.
Application examples 1
The catalyst weighed in 30mg embodiment 1- embodiment 12 and comparative example 1-4 is fitted into micro fixed-bed reactor,
Catalyst is down to room temperature after 200 DEG C of prereduction 0.5h in a hydrogen atmosphere, and inert gas Ar purges 20min, then switches to CO/
O2/ Ar reaction gas (volume ratio, 1/1/98) is reacted.Unstripped gas air speed 50000h-1, CO oxidation elimination results of property such as table 1
It is shown.
Table 1
| Catalyst | CO conversion ratio (%) | Initiation temperature (DEG C) |
| Cat 1 | 100 | 150 |
| Cat 2 | 100 | 180 |
| Cat 3 | 100 | 180 |
| Cat 4 | 100 | 180 |
| Cat 5 | 100 | 150 |
| Cat 6 | 100 | 180 |
| Cat 7 | 100 | 130 |
| Cat 8 | 100 | 160 |
| Cat 9 | 100 | 170 |
| Cat 10 | 100 | 170 |
| Cat 11 | 100 | 160 |
| Cat 12 | 100 | 150 |
| Cat D1 | 100 | 290 |
Pass through above-mentioned testing result, it is seen that:
(1) using coprecipitation by metal halide (nickel, cobalt or zinc), CO initiation temperature can be decreased obviously, to find out its cause,
It is presumed that metal halide (nickel, cobalt or zinc) is implanted to carrier Al2O3In structure, effectively change Al2O3It is aoxidized with metal
The mode of action of object activates the electronics of carrier to enliven ability.
(2) CO initiation temperature can be decreased obviously after adding cellulose, to find out its cause, it is presumed that, by cellulose to multiple
Close Al2O3The modification of carrier, improves Al2O3The surface group characteristic of carrier improves the absorption dispersion of palladium compound and stablizes
Property；
(3) in the case where not adding sodium borohydride reduction, obtained catalyst precarsor need to pass through high-temperature roasting and hydrogen
Gas reduction, catalyst granules sintering easy to reunite, and the low-temperature reduction of sodium borohydride is utilized, avoid high-temperature roasting and high-temperature hydrogen
Link is restored, the thermal stability of Pd species is improved.
The preparation method is simple, easily controllable, application value with higher, and the catalyst show it is excellent
CO low-temperature oxidation eliminates performance.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of preparation method of the nano Pd catalyst of composite carrier load, which is characterized in that the preparation method include with
Lower step:
(1) Al is taken2O3It is mixed with water, metal halide ultrasonic disperse is added, adds cellulose, ultrasonic disperse obtains mixed liquor；
(2) carbonate solution is added in the mixed liquor of step (1), mixing, is dried after crystallization, obtains complex carrier；
(3) complex carrier in step (2) is impregnated in palladium salt solution, adjusts the pH to 7-10 of solution, borohydride salts are added,
It is mixed and dried.
2. preparation method according to claim 1, wherein Al2O3In Al element, the metallic element in metal halide
It is 3-20:1:0.9-1.1 with the ratio between the amount of substance of carbonate.
3. preparation method according to claim 2, wherein relative to the complex carrier in 10g step (2), palladium salt solution
The mass content of middle palladium element is 0.01-0.5g.
4. preparation method according to any one of claim 1-3, wherein the Al relative to 10g2O3, the dosage of cellulose
For 0.1-2g, the dosage of water is 10-20mL in step (1)；Relative to the complex carrier in 10g step (2), the use of borohydride salts
Amount is 0.5-5.0mmol.
5. the preparation method according to claim 4, wherein the volume ratio of water and carbonate solution in step (1) is 1:
0.8-1.2；
And/or relative to the complex carrier in 10g step (2), the volume of palladium salt solution is 10-20mL.
6. preparation method according to claim 1, wherein it is 60-100 that the condition of crystallization, which includes: temperature, in step (2)
℃；And/or time 6-24h.
7. preparation method according to claim 1, wherein the mixing condition after borohydride salts is added in step (3) are as follows: temperature
Degree is 20-80 DEG C；And/or time 5-24h.
8. preparation method according to claim 1, wherein metal halide is in nickel chloride, cobalt chloride and zinc chloride
It is one or more；
And/or carbonate is sodium carbonate and/or potassium carbonate；
And/or palladium salt is one of palladium chloride, palladium nitrate and palladium acetate or a variety of；
And/or borohydride salts are sodium borohydride and/or potassium borohydride.
9. the nanometer palladium chtalyst for the composite carrier load that preparation method according to claim 1-8 is prepared
Agent.
10. a kind of application of nano Pd catalyst of composite carrier load as claimed in claim 9 in CO oxidation.
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