CN111036280B - Fe/Cu-SSZ-13分子筛的制备方法 - Google Patents
Fe/Cu-SSZ-13分子筛的制备方法 Download PDFInfo
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 75
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000010949 copper Substances 0.000 claims abstract description 27
- 230000032683 aging Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003513 alkali Substances 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- 238000002425 crystallisation Methods 0.000 claims abstract description 5
- 230000008025 crystallization Effects 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 5
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000012452 mother liquor Substances 0.000 claims abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000499 gel Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 6
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 150000001879 copper Chemical class 0.000 claims description 4
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 3
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 230000003137 locomotive effect Effects 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 claims description 3
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 claims description 3
- 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 claims description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 2
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 2
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 229910052680 mordenite Inorganic materials 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 29
- 229910021645 metal ion Inorganic materials 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 2
- 229910002530 Cu-Y Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- GNUJKXOGRSTACR-UHFFFAOYSA-M 1-adamantyl(trimethyl)azanium;hydroxide Chemical compound [OH-].C1C(C2)CC3CC2CC1([N+](C)(C)C)C3 GNUJKXOGRSTACR-UHFFFAOYSA-M 0.000 description 2
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 description 2
- 235000019743 Choline chloride Nutrition 0.000 description 2
- -1 Cu-SSZ-13 Chemical compound 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- YAIQCYZCSGLAAN-UHFFFAOYSA-N [Si+4].[O-2].[Al+3] Chemical compound [Si+4].[O-2].[Al+3] YAIQCYZCSGLAAN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical compound [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 description 2
- 229960003178 choline chloride Drugs 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 238000002390 rotary evaporation Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- IQKLAEINENLGAG-UHFFFAOYSA-N iron oxocopper Chemical compound [Fe].[Cu]=O IQKLAEINENLGAG-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
- B01J29/10—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing iron group metals, noble metals or copper
- B01J29/14—Iron group metals or copper
- B01J29/146—Y-type faujasite
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
- B01J29/7615—Zeolite Beta
-
- B01J35/394—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
本发明涉及一种Fe/Cu‑SSZ‑13分子筛的制备方法,属于分子筛催化剂制备领域;包括以下步骤:a)将分子筛、铁源和铜源在水中混合均匀,在40~90℃下交换1~10h,将产物过滤、洗涤、烘干后得到Fe/Cu分子筛;b)将步骤a)中得到的Fe/Cu分子筛按照如下条件进行水热老化处理:c)将步骤b)中水热老化处理的Fe/Cu分子筛、铝源、碱源、模板剂和硅源在去离子水中搅拌均匀制备凝胶;d)将步骤c)中凝胶转移至晶化釜中,在120~190℃下晶化12~96h,得到产物浆液,产物浆液经脱母液、洗涤、交换、烘干、焙烧后,即可得到Fe/Cu‑SSZ‑13分子筛。本发明的特点在于制备过程中能够大幅度降低或者不使用昂贵模,制备的Fe/Cu‑SSZ‑13分子筛具有金属离子分散度高、负载量可控的特点。
Description
技术领域
本发明涉及一种Fe/Cu-SSZ-13分子筛的制备方法,属于分子筛催化剂制备领域。
背景技术
氮氧化物(NOx)是大气的主要污染物之一,主要能够造成酸雨、光化学烟雾以及破坏臭氧层等环境问题。目前国内氮氧化物主要来自于日益增多的机动车。随着国家排放法规的日益严格,如何高效的脱除机车尾气中氮氧化物成为减少污染的重中之重。
氨选择性催化还原技术(NH3-SCR)是目前国际上应用最为广泛的NOX脱除技术,其原理是以NH3或尿素作为还原剂,将NOX还原为无害的N2而排放。SCR技术的关键是开发高效稳定的催化剂体系,以适应机动车使用的特殊环境。目前该技术的商业催化剂以V2O5-WO3/TiO2为主。该催化剂弊端诸多,如低温活性差、活性温度窗口窄、高温稳定性差、SO2被氧化以及钒流失污染等问题。随着环保法规的日益严格,传统V2O5-WO3/TiO2催化剂难以满足排放法规要求。新一代负载金属离子的分子筛基催化剂已经在国内外广泛应用,在用作SCR催化剂方面,既可以使用单一离子负载分子筛,如Cu-SSZ-13,Fe-Beta,Fe-ZSM-5。也可以使用混合离子负载分子筛,如Cu/Fe-SSZ-13、Cu/Fe-Beta、Cu/Fe-ZSM-5。综合应用及研究后发现,SSZ-13分子筛负载金属制备的SCR催化剂的氨选择性催化还原性能最佳。
专利CN201910218619.2公开一种在无钠体系下一步合成Cu-SSZ-13的方法,通过将铝源、硅源、铜氨络合物(氨水)、铜离子负载量调节剂(乙醇)制成初始凝胶,晶化后得到Cu-SSZ-13分子筛。专利CN201810643979.2公开一种Cu-SSZ-13分子筛催化剂的制备方法。专利采用添加晶种并使用多模板剂的方法一步原位制备Cu-SSZ-13催化剂。专利中有机胺模板剂(四乙烯五胺、氯化胆碱)与铜离子络合,并加入SSZ-13晶种,晶化得到Cu-SSZ-13分子筛催化剂。专利CN201810506476.0使用NNN三甲基金刚烷基氢氧化铵或氯化胆碱作为模板剂,Cu-四乙烯五胺作为铜源,添加十六烷基三甲基溴化铵作为促进剂,合成Cu-SSZ-13分子筛专利CN201710721073.3提供了一种旋蒸法负载铜制备Cu-SSZ-13分子筛催化剂的方法。专利在抽真空的状态下采用旋转蒸发的方法将铜负载在SSZ-13分子筛催化剂上。专利CN201210532005.X公开一种Fe和Cu复合分子筛催化剂的制备方法,专利首先制备Fe分子筛催化剂和Cu分子筛催化剂,然后采用机械式串联复合Cu分子筛催化剂和Fe分子筛催化剂,得到Fe和Cu复合分子筛催化剂,即采用机械混合方式制备Fe/Cu分子筛催化剂,该类催化剂的NOx的去除效率在95%以上。专利CN201710840939.2公开一种铁-铜氧化物和分子筛复合蜂窝式脱硝催化剂的制备方法。专利利用铁/铜氧化物-铁/铜负载分子筛-钛基载体之间的协同效应,提高了蜂窝式脱硝催化剂的脱硝活性和抗水硫中毒性能。
上述专利在实际工业化应用上均有诸多限制因素,如原料安全问题,原料成本问题,水处理问题以及设备问题等。因此,开发成本低、工艺易于实现的Fe/Cu-SSZ-13分子筛的合成路线具有重要意义。
发明内容
根据现有技术的不足,本发明要解决的技术问题是:提供一种Fe/Cu-SSZ-13分子筛的制备方法,本方法工业可行度高,并且成本低廉,无安全问题。
本发明解决其技术问题所采用的技术方案是:提供一种Fe/Cu-SSZ-13分子筛的制备方法,包括以下步骤:
a)将分子筛、铁源和铜源在水中混合均匀,在40~90℃下交换1~10h,将产物过滤、洗涤、烘干后得到Fe/Cu分子筛;优选方案为:70~90℃下交换1~5h;
b)将步骤a)中得到的Fe/Cu分子筛按照如下条件进行水热老化处理:
(1)水热老化处理温度320~600℃;
(2)蒸汽质量空速0.1~10h-1;
(3)水热老化处理时间1~8h;
优选方案中水热老化处理条件为:
(1)水热老化处理温度420~600℃;
(2)蒸汽质量空速0.5~5h-1;
(3)水热老化处理时间1~4h。
c)将步骤b)中水热老化处理的Fe/Cu分子筛、铝源、碱源、模板剂和硅源在去离子水中搅拌均匀制备凝胶;
d)将步骤c)中凝胶转移至晶化釜中,在120~190℃下晶化12~96h,得到产物浆液,产物浆液经脱母液、洗涤、交换、烘干、焙烧后,即可得到Fe/Cu-SSZ-13分子筛。
步骤a)中所述的分子筛为具有FAU、BEA或MOR拓扑结构的分子筛;铁源为+2或+3价可溶性铁盐;铜盐为+2价可溶性铜盐。
步骤a)中所述的分子筛为Beta分子筛、Y型分子筛、X型分子筛和丝光沸石中的一种或多种;铁源为硫酸亚铁、硫酸铁、氯化亚铁、氯化铁和硝酸铁中的一种或几种;铜盐为硫酸铜、氯化铜、硝酸铜和醋酸铜中的一种或多种。
步骤a)中所述的Fe/Cu分子筛中各组分的物质的量比为:Al2O3:SiO2:Fe2O3:CuO=0.01~0.2:1:0~0.1:0~0.1。
步骤c)中所述的铝源为偏铝酸钠、拟薄水铝石和硫酸铝的一种或多种;碱源为氢氧化钠和氢氧化钾的一种或两种;模板剂为四乙基氢氧化铵、三乙胺和N,N,N-三甲基金刚烷基氢氧化铵的一种或多种;硅源为硅溶胶、硅胶、白炭黑和水玻璃的一种或多种。
步骤c)中所述的凝胶中各组分的物质的量比如下:Fe2O3:CuO2:Al2O3:SiO2:X2O:R:H2O=0~0.1:0~0.1:0.01~0.1:1:0.01~0.5:0.01~0.5:5~100。
所制备的Fe/Cu-SSZ-13分子筛应用在净化机车尾气中氮氧化物的氨选择性催化还原反应中。
本发明的有益效果是:
本发明的特点在于制备过程中能够大幅度降低或者不使用昂贵模,制备的Fe/Cu-SSZ-13分子筛具有金属离子分散度高、负载量可控的特点。
本发明的特点还在于制备的Fe/Cu-SSZ-13分子筛具有结晶度高、收率高、制造成本低的特点。
本发明制备的Fe/Cu-SSZ-13分子筛用在氨选择性催化还原(NH3-SCR)反应中,表现出较宽的活性窗口温度、较高的氮气选择性、优异的水热稳定性和抗硫中毒能力。
附图说明
图1为实施例1~10中样品的X-射线衍射谱图。
图2-4为实施例1、9、10样品的扫描电子显微镜照片(SEM)。
具体实施方式
下面对本发明的实施例做进一步描述:
实施例1
一种Fe/Cu-SSZ-13分子筛的制备方法,包括以下步骤:
a)Fe/Cu-Y分子筛制备
在去离子水中依次加入Y(SAR=5.6)、硫酸亚铁和硫酸铜混合搅拌均匀,升温至70℃,负载交换2h。负载交换完成后,将产物过滤、洗涤、烘干后得到Fe/Cu-Y分子筛。Fe/Cu-Y分子筛中有效组分的物质的量比为:Al2O3:SiO2:Fe2O3:CuO=0.1786:1:0.01786:0.0893。
b)Fe/Cu-Y分子筛水热老化
将步骤a)得到的Fe/Cu-Y分子筛按照如下条件老化:1.水热老化处理温度580℃;2.蒸汽质量空速1h-1;3.水热老化处理时间2h。
c)Fe/Cu-SSZ-13分子筛合成
将步骤b)得到的Fe/Cu-Y分子筛、氢氧化钠、四乙基氢氧化铵、N,N,N-三甲基金刚烷基氢氧化铵、硅溶胶在去离子水中搅拌均匀制备凝胶。凝胶在170℃下晶化36h,得到产物浆液。产物浆液经脱母液、洗涤、交换、烘干、焙烧后,即可得到Fe/Cu-SSZ-13分子筛(S-1)。凝胶中各组分的物质的量比如下:Fe2O3:CuO:Al2O3:SiO2:Na2O:TEAOH:TMAdaOH:H2O=0.004:0.02:0.04:1:0.1:0.12:0.01:20;
实施例2~10及对比例
实施例2~10按照实施例1步骤进行,原料及其加入比例、处理工艺、晶化参数等数据按照表1及表2执行。对比例为常规离子交换方法制备的Fe/Cu-SSZ-13分子筛。
SCR活性测试
将实施例催化剂样品进行水热老化处理。水热老化条件如下:860℃,100%水蒸气,质量空速3h-1,老化时间20h。
在氨选择性催化还原装置上对催化剂进行活性测试,称量催化剂5g。测试条件为:40-60目分子筛催化剂;气氛为:0.05%NO,0.05%NH3,5%O2,10%H2O,氮气为平衡气;总气体流量为500ml/min,体积空速为50000h-1;反应温度100~700℃。
表1实施例1~10中Fe/Cu分子筛负载交换及水热老化条件
表2实施例1~10中Fe/Cu-SSZ-13制备原料及参数
表3实施例1~10与对比例样品物性参数及SCR催化性能
收率=M产物硅铝氧化物干基/M投料硅铝氧化物干基*100%
结晶度=样品峰面积(2θ=20.7°)/对比例样品峰面积(2θ=20.7°)*100%
活性窗口:NOX转化率大于85%时的温度范围(N2选择性>99%)
Claims (4)
1.一种Fe/Cu-SSZ-13分子筛的制备方法,其特征在于包括以下步骤:
a)将分子筛、铁源和铜源在水中混合均匀,在40~90℃下交换1~10h,将产物过滤、洗涤、烘干后得到Fe/Cu分子筛;
b)将步骤a)中得到的Fe/Cu分子筛按照如下条件进行水热老化处理:
(1)水热老化处理温度320~600℃;
(2)蒸汽质量空速0.1~10h-1;
(3)水热老化处理时间1~8h;
c)将步骤b)中水热老化处理的Fe/Cu分子筛、铝源、碱源、模板剂和硅源在去离子水中搅拌均匀制备凝胶;
d)将步骤c)中凝胶转移至晶化釜中,在120~190℃下晶化12~96h,得到产物浆液,产物浆液经脱母液、洗涤、交换、烘干、焙烧后,即可得到Fe/Cu-SSZ-13分子筛;
步骤a)中所述的分子筛为Beta分子筛、Y型分子筛、X型分子筛和丝光沸石中的一种或多种;铁源为硫酸亚铁、硫酸铁、氯化亚铁、氯化铁和硝酸铁中的一种或几种;铜盐为硫酸铜、氯化铜、硝酸铜和醋酸铜中的一种或多种;
步骤a)中所述的Fe/Cu分子筛中各组分的物质的量比为:Al2O3:SiO2:Fe2O3:CuO=0.01~0.2:1:0~0.1:0~0.1,其中Fe2O3和CuO不能为0。
2.根据权利要求1所述的一种Fe/Cu-SSZ-13分子筛的制备方法,其特征在于步骤c)中所述的铝源为偏铝酸钠、拟薄水铝石和硫酸铝的一种或多种;碱源为氢氧化钠和氢氧化钾的一种或两种;模板剂为四乙基氢氧化铵、三乙胺和N,N,N-三甲基金刚烷基氢氧化铵的一种或多种;硅源为硅溶胶、硅胶、白炭黑和水玻璃的一种或多种。
3.根据权利要求1所述的一种Fe/Cu-SSZ-13分子筛的制备方法,其特征在于步骤c)中所述的凝胶中各组分的物质的量比如下:Fe2O3:CuO:Al2O3:SiO2:X2O:R:H2O=0~0.1:0~0.1:0.01~0.1:1:0.01~0.5:0.01~0.5:5~100,其中Fe2O3和CuO不能为0,X为碱源,R为模板剂。
4.根据利要求1所制备的Fe/Cu-SSZ-13分子筛的制备方法,其特征在于所制备的Fe/Cu-SSZ-13分子筛应用在净化机车尾气中氮氧化物的氨选择性催化还原反应中。
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