CN109499590A - 1,1,1,3,3-五氟丙烷脱氟化氢制备1,3,3,3-四氟丙烯用镁基催化剂 - Google Patents
1,1,1,3,3-五氟丙烷脱氟化氢制备1,3,3,3-四氟丙烯用镁基催化剂 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 49
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000005796 dehydrofluorination reaction Methods 0.000 title claims abstract description 19
- CDOOAUSHHFGWSA-OWOJBTEDSA-N (e)-1,3,3,3-tetrafluoroprop-1-ene Chemical compound F\C=C\C(F)(F)F CDOOAUSHHFGWSA-OWOJBTEDSA-N 0.000 title claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 11
- 239000011777 magnesium Substances 0.000 claims abstract description 11
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 238000003682 fluorination reaction Methods 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- CDOOAUSHHFGWSA-UHFFFAOYSA-N 1,3,3,3-tetrafluoropropene Chemical class FC=CC(F)(F)F CDOOAUSHHFGWSA-UHFFFAOYSA-N 0.000 claims abstract 2
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 26
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- 239000008139 complexing agent Substances 0.000 claims description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 4
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 150000003891 oxalate salts Chemical class 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229920000858 Cyclodextrin Polymers 0.000 claims description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 claims description 2
- 239000011654 magnesium acetate Substances 0.000 claims description 2
- 229940069446 magnesium acetate Drugs 0.000 claims description 2
- 235000011285 magnesium acetate Nutrition 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- GMDNUWQNDQDBNQ-UHFFFAOYSA-L magnesium;diformate Chemical compound [Mg+2].[O-]C=O.[O-]C=O GMDNUWQNDQDBNQ-UHFFFAOYSA-L 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- 229960004063 propylene glycol Drugs 0.000 claims description 2
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 claims description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052731 fluorine Inorganic materials 0.000 abstract description 3
- 239000011737 fluorine Substances 0.000 abstract description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000002585 base Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 239000003085 diluting agent Substances 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 2
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- -1 1,3,3,3- tetrafluoropropene magnesium Chemical compound 0.000 description 1
- ZXSQEZNORDWBGZ-UHFFFAOYSA-N 1,3-dihydropyrrolo[2,3-b]pyridin-2-one Chemical compound C1=CN=C2NC(=O)CC2=C1 ZXSQEZNORDWBGZ-UHFFFAOYSA-N 0.000 description 1
- LDTMPQQAWUMPKS-UHFFFAOYSA-N 1-chloro-3,3,3-trifluoroprop-1-ene Chemical class FC(F)(F)C=CCl LDTMPQQAWUMPKS-UHFFFAOYSA-N 0.000 description 1
- QJMGASHUZRHZBT-UHFFFAOYSA-N 2,3-dichloro-1,1,1-trifluoropropane Chemical compound FC(F)(F)C(Cl)CCl QJMGASHUZRHZBT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007033 dehydrochlorination reaction Methods 0.000 description 1
- VKFAUCPBMAGVRG-UHFFFAOYSA-N dipivefrin hydrochloride Chemical compound [Cl-].C[NH2+]CC(O)C1=CC=C(OC(=O)C(C)(C)C)C(OC(=O)C(C)(C)C)=C1 VKFAUCPBMAGVRG-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(III) nitrate Inorganic materials [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002680 magnesium Chemical class 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(II) nitrate Inorganic materials [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 1
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- LKZMBDSASOBTPN-UHFFFAOYSA-L silver carbonate Substances [Ag].[O-]C([O-])=O LKZMBDSASOBTPN-UHFFFAOYSA-L 0.000 description 1
- 229910001958 silver carbonate Inorganic materials 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Inorganic materials [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
- B01J27/138—Halogens; Compounds thereof with alkaline earth metals, magnesium, beryllium, zinc, cadmium or mercury
-
- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
-
- 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
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
-
- 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
- B01J37/22—Halogenating
- B01J37/26—Fluorinating
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/25—Preparation of halogenated hydrocarbons by splitting-off hydrogen halides from halogenated hydrocarbons
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
本发明公开了一种1,1,1,3,3‑五氟丙烷脱氟化氢制备1,3,3,3‑四氟丙烯的氟化镁基催化剂,催化剂组成为:n%X/MgF2,其中,X表示活性组分,选自Al、Cr、Zn、Fe、Ni或Co的可溶性盐;n表示活性组分用量,氟化镁载体采用多元醇氟化法制备,活性组分选用体相掺杂法引入到催化剂,该催化剂主要用于但不仅限于含氟烯烃的制备。
Description
技术领域
本发明涉及系列脱氟化氢催化剂,特别是用于1,1,1,3,3-五氟丙烷脱氟化氢制备1,3,3,3-四氟丙烯的镁基催化剂。
背景技术
HFO-1234ze(1,3,3,3-四氟丙烯)不可燃,ODP值为0,GWP值为6。研究发现,HFO-1234ze能够在单组分泡沫及气雾剂中直接替代HFC-134a,因此具有非常大的应用前景。目前HFO-1234ze的合成主要分为以1,1,1,3,3-五氟丙烷(HFC-245fa)为原料脱氟化氢法、三氟丙炔直接加成法、三氟氯丙烯直接取代法和热裂解法等,其中HFC-245fa气相脱氟化氢制备HFO-1234ze合成路线简洁,目标产物收率高,是最具发展潜力的合成路线。
罗孟飞课题组以Pd/AlF3为催化剂考察其在HFC-245fa气相脱氟化氢制备HFO-1234ze反应中的催化性能,反应中通氮气为稀释气,最优催化剂于300℃反应100h后,原料转化率由95%下降至79.5%,反应温度较高且催化剂需要使用昂贵的硝酸钯为原料(LuoMengfei,Chem.Res.Chin.Univ.,2015,31,1003);随后该课题组报道了以NiO/Cr2O3为催化剂考察其在该反应中的催化性能,在稀释气体氮气存在下于320℃反应,10h内原料转化率由89%降至76%,反应温度较高,且催化剂在短时间内存在明显失活(Luo Mengfei,Appl.Surf.Sci.,2015,145,654)。
专利CN103537305B报道了Ni-Ag-Cr2O3-AlF3作为HFC-245fa裂解联产HFO-1234ze和2,3,3,3-四氟丙烯(HFO-1234yf)的催化剂,在稀释气体氮气存在下于400℃下反应,HFC-245fa转化率最高为98.5%,HFO-1234ze选择性最高为90%,反应温度较高,并且催化剂制备中需使用昂贵的氧化银或碳酸银。
目前催化剂制备过程中需使用贵金属化合物,反应过程中需通入氮气等稀释气,增加后续分离成本,且催化剂在反应过程中存在明显失活。
发明内容
针对现有技术中存在的缺陷或不足,本发明的目的在于,提供一种制备过程中不需使用贵金属化合物,成本低,反应过程中不需通入稀释气体,使用寿命长的HFC-245fa脱氟化氢制备HFO-1234ze的镁基催化剂。
为了实现上述任务,本发明采用如下的技术解决方案予以实现:
本发明的HFC-245fa脱氟化氢制备HFO-1234ze用的镁基催化剂,催化剂组成为n%X/MgF2,其中,X表示活性组分,选自Al、Cr、Zn、Fe、Co或Ni的可溶性盐;n表示活性组分的用量。氟化镁载体选用多元醇氟化法制备,载体与助剂结合选用体相掺杂法。
本发明的HFC-245fa脱氟化氢制备HFO-1234ze用的镁基催化剂的制备方法,包含以下步骤:
(1)将镁源、络合剂、活性组分、多元醇混合,30℃~60℃搅拌后形成无色清亮溶液A;
所述镁源为甲酸镁、乙酸镁、硝酸镁、氯化镁中的一种或几种的任意组合;
所述络合剂为聚乙二醇、聚乙烯醇、聚乙烯吡咯烷酮、环糊精、环氧乙烷中的一种或几种的任意组合;
所述活性组分是Al、Cr、Zn、Fe、Co或Ni的硝酸盐、硫酸盐、氯化盐或草酸盐中的一种或几种的任意组合;
所述多元醇为乙二醇、1,3-丙二醇、1,2-丙二醇、1,4-丁二醇、二缩二乙二醇中的一种或几种的任意组合;
(2)在搅拌下,将氢氟酸滴加至反应液A中进行氟化处理,继续搅拌6h以上,得到反应液B;
所述氢氟酸为40~100wt.%的氢氟酸水溶液;
(3)将反应液B转移至80~100℃烘箱中加热24h以上,得到凝胶状固体C;
(4)将凝胶固体C转移至110~150℃烘箱中烘干24h,得到干凝胶固体,最后在350℃~500℃条件下焙烧4h以上,得到催化剂粉体,造粒成型,即通过体相掺杂法制得镁基催化剂。
本发明的HFC-245fa脱氟化氢制备HFO-1234ze的镁基催化剂,体相掺杂法的优选组成为:活性组分选择硝酸铝,硝酸铝和氟化镁载体的摩尔比为0.05~0.3:1。
本发明的镁基催化剂除用于HFC-245fa脱氟化氢制备HFO-1234ze外,还可用于其他气相条件下卤氟烷烃脱卤化氢制备含氟烯烃的反应,如四氟乙烷脱氟化氢制备三氟乙烯,2,3-二氯-1,1,1-三氟丙烷脱氯化氢得到1-氯-3,3,3-三氟丙烯等。
本发明的HFC-245fa脱氟化氢制备HFO-1234ze的镁基催化剂,与现有技术相比,具有如下有益效果:①催化剂不使用贵金属化合物;②本发明制备的镁基催化剂具有较大的比表面积,400℃焙烧后氟化镁载体的比表面积大于150m2/g,掺杂活性组分后比表面积大于250m2/g;③本发明采用弱酸性氟化镁为催化剂载体,能够避免因催化剂表面路易斯酸性过强造成的“结碳”问题,因此催化剂具有较好的寿命和较高的催化活性,在催化HFC-245fa脱氟化氢制备HFO-1234ze反应中,催化剂连续运行1000h,催化剂活性基本保持不变,HFC-245fa转化率维持在70%以上;④具有较高的选择性,HFO-1234ze选择性接近100%。
具体实施方式
下列结合实施例对本发明进一步详述,但并不限制本发明的范围。
催化剂性能评价:量取5mL催化剂装入反应管中,待反应温度稳定在260℃后,通入HFC-245fa原料,保持接触时间为6s,运行时间为24h,反应产物经水洗、碱洗后,再经干燥采用气相色谱进行分析。
实施例1:
将1mol镁源、一定量的活性组分与等质量的络合剂溶解于50mL多元醇中,水浴温度60℃及磁力搅拌后形成无色清亮溶液;添加计量比的40wt.%氢氟酸,继续反应6h;80℃~100℃老化24h后得到固体凝胶;继续于110~150℃干燥得到氟化镁干凝胶,研磨成粉,最后在400℃条件下焙烧5h,得到催化剂粉体,再造粒成型,即通过体相掺杂法制得镁基催化剂。将催化剂应用到HFC-245fa气相脱氟化氢合成HFO-1234ze反应中,运行24h后,反应结果见表1所示。
在实施例1中引入的活性组分分别为Al(NO3)3·9H2O、Cr(NO3)3·9H2O、Zn(NO3)2·6H2O、Fe(NO3)3·6H2O、Ni(NO3)2·6H2O和Co(NO3)2·6H2O,活性组分与载体摩尔比为0.1。
表1实施例1的镁基催化剂的反应评价结果
实施例2
在本实施例中引入的活性组分为Al(NO3)3·9H2O,活性组分与载体摩尔比为0.05~0.3不等。
催化剂性能评价条件与实施例1相同,催化剂评价结果见表2所示。
表2
编号 | 催化剂 | HFC-245转化率/% | HFO-1234ze选择性/% |
1 | 5%Al/MgF<sub>2</sub> | 68 | 100 |
2 | 10%Al/MgF<sub>2</sub> | 70 | 100 |
3 | 15%Al/MgF<sub>2</sub> | 71 | 100 |
4 | 20%Al/MgF<sub>2</sub> | 75 | 100 |
5 | 25%Al/MgF<sub>2</sub> | 75 | 100 |
6 | 30%Al/MgF<sub>2</sub> | 75 | 99.9 |
实施例3
以实施例2中编号4的20%Al/MgF2催化剂进行寿命实验,催化剂性能评价条件与实施例1相同,反应连续运行1000h,评价结果见表3。
表3
实施例4
以实施例2中编号4的20%Al/MgF2催化剂考察不同反应温度和接触时间下催化剂的性能,催化剂评价结果见表4
表4
Claims (2)
1.一种1,1,1,3,3-五氟丙烷脱氟化氢制备1,3,3,3-四氟丙烯用镁基催化剂,其特征在于,催化剂组成为n%X/MgF2,其中,X表示活性组分,n表示活性组分的用量;
所述活性组分选自Al、Cr、Zn、Fe、Co或Ni的可溶性硝酸盐、硫酸盐、氯化盐或草酸盐,活性组分通过体相掺杂法引入催化剂,所用活性组分与氟化镁载体摩尔比为0.05~0.3:1;
催化剂制备方法包括以下步骤:
(1)将镁源、络合剂、活性组分、多元醇混合,30℃~60℃搅拌后形成无色清亮溶液;
所述镁源为甲酸镁、乙酸镁、硝酸镁、氯化镁中的一种或几种的任意组合;
所述络合剂为聚乙二醇、聚乙烯醇、聚乙烯吡咯烷酮、环糊精、环氧乙烷中的一种或几种的任意组合;
所述活性组分是Al、Cr、Zn、Fe、Co或Ni的硝酸盐、硫酸盐、氯化盐或草酸盐中的一种或几种的任意组合;
所述多元醇为乙二醇、1,3-丙二醇、1,2-丙二醇、1,4-丁二醇、二缩二乙二醇中的一种或几种的任意组合;
(2)在搅拌下,将氢氟酸滴加至上述溶液中进行氟化处理,继续搅拌6h以上,得到溶胶;
所述氢氟酸为40~100wt.%的氢氟酸水溶液;
(3)将溶胶转移至80~100℃烘箱中加热24h以上,得到凝胶状固体;
(4)将凝胶状固体转移至110~150℃烘箱中烘干24h,得到干凝胶固体,最后在350℃~500℃条件下焙烧4h以上,得到催化剂粉体,造粒成型,即通过体相掺杂法制得镁基催化剂。
2.根据权利要求1所述1,1,1,3,3-五氟丙烷脱氟化氢制备1,3,3,3-四氟丙烯用镁基催化剂,用于1,1,1,3,3-五氟丙烷气相催化脱氟化氢合成1,3,3,3-四氟丙烯反应。
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