CN107970988A - 一种用于合成芳烃的催化剂和其制备方法 - Google Patents
一种用于合成芳烃的催化剂和其制备方法 Download PDFInfo
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- CN107970988A CN107970988A CN201610931965.1A CN201610931965A CN107970988A CN 107970988 A CN107970988 A CN 107970988A CN 201610931965 A CN201610931965 A CN 201610931965A CN 107970988 A CN107970988 A CN 107970988A
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- Prior art keywords
- molecular sieve
- particle
- catalyst
- acidic molecular
- aromatic hydrocarbons
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- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 76
- 230000002378 acidificating effect Effects 0.000 claims abstract description 37
- 239000002131 composite material Substances 0.000 claims abstract description 37
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- 239000007789 gas Substances 0.000 claims description 19
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
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- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- FYGHSUNMUKGBRK-UHFFFAOYSA-N 1,2,3-trimethylbenzene Chemical compound CC1=CC=CC(C)=C1C FYGHSUNMUKGBRK-UHFFFAOYSA-N 0.000 claims description 4
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 4
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
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- 239000001099 ammonium carbonate Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
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- 239000008096 xylene Substances 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 2
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- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims 1
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- 238000000975 co-precipitation Methods 0.000 description 10
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- 229910002651 NO3 Inorganic materials 0.000 description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 9
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- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
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- 238000001833 catalytic reforming Methods 0.000 description 4
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- 125000003118 aryl group Chemical group 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
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- 229910000906 Bronze Inorganic materials 0.000 description 1
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
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- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
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- 229910052746 lanthanum Inorganic materials 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
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- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/405—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/02—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon
- C07C1/04—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon from carbon monoxide with hydrogen
- C07C1/0425—Catalysts; their physical properties
- C07C1/0445—Preparation; Activation
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- 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
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
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- 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
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
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- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
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- B01J23/06—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of zinc, cadmium or mercury
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- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/26—Chromium
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- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
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Abstract
本发明涉及一种用于合成芳烃的催化剂及其制备方法,还涉及一种使用该催化剂合成芳烃的方法。所述催化剂包括酸性分子筛颗粒和锌铝复合氧化物颗粒。本发明的催化剂对芳烃,尤其是BTX选择性较高,性能稳定,且单程寿命长。其特别适用于芳烃的一步合成,从而降低了分步合成带来的大量的能耗的问题。现有技术相比,本发明中失活的催化剂经过多次重生后性能无明显下降。
Description
技术领域
本发明涉及一种用于合成芳烃的催化剂及其制备方法,还涉及一种使用该催化剂合成芳烃的方法。
背景技术
芳烃尤其是苯(Benzene),甲苯(Toluene)和二甲苯(Xylene),统称为BTX,是产量和规模仅次于乙稀和丙烯的重要有机化工原料,其衍生物广泛用于燃料、石化、化纤、塑料和橡胶等化工产品和精细化工品。
目前芳烃主要以石油为原料进行生产,其中世界范围内70%的BTX芳烃来自炼油厂的催化重整工艺单元。催化重整技术是以石脑油为原料,采用半再生和连续再生重整的工艺类型,催化重整一般采用含铂催化剂。催化重整的典型工艺代表为UOP公司的CCRplatformer工艺和IFP公司的Aromizer工艺。另外,石油路线的芳烃生产工艺还有汽油加氢技术、芳烃抽提技术、重芳烃轻质化技术以及轻烃芳构化技术。
随着社会的不断发展,世界上对芳烃的需求量不断增长,然而石油资源日益紧张造成芳烃尤其是BTX的价格居高不下。鉴于中国“富煤贫油”的能源结构现状,大力发展煤化工路线制芳烃具有非常重要的意义。在煤化工制芳烃技术中,以煤化工平台产品甲醇为原料制取芳烃的技术(MTA)研究最为广泛。甲醇制芳烃技术一般采用金属锌、镓、银等金属改性的酸性ZSM-5分子筛催化剂,然而芳烃选择性下降快,催化剂寿命短,BTX选择性不高,催化剂重生后性能下降明显等因素制约了甲醇制芳烃技术的大规模工业化应用。众所周知,工业甲醇一般以合成气为原料进行生产,如果利用合成气直接制取芳烃可以缩短反应路径、节约能耗、减少污水排放以及降低固定投资。合成气直接制取芳烃研究较少,芳烃选择性低,催化剂稳定性差以及失活催化剂不能够重生等原因制约了该技术研究的进一步发展。
因此亟需一种芳烃选择性较高,性能稳定的催化剂。
发明内容
根据现有技术中存在的技术问题,本发明开发出了一种芳烃选择性较高,性能稳定的催化剂。而且本发明的催化剂特别适用于芳烃的一步合成,从而降低了分步合成带来的大量的能耗的问题。
具体来讲,本发明之一提供了一种催化剂,所述催化剂包括酸性分子筛颗粒和锌铝复合氧化物颗粒。
在一个具体实施方式中,所述锌铝复合氧化物颗粒可以通过浸渍或不通过浸渍改性加入其他金属元素。
但是作为优选的具体实施方式,所述锌铝复合氧化物颗粒中还包括其他金属元素。
作为一个更优选的具体实施方式,所述其他金属元素为除去锌、铝和放射性元素的其他金属元素。
作为一个进一步优选的具体实施方式,所述其他金属元素包括锆、铜、铂、钯和铬中的至少一种。
在一个具体实施方式中,所述酸性分子筛颗粒与所述锌铝复合氧化物颗粒的质量比为1:19至19:1。
在一个优选的具体实施方式中,所述酸性分子筛颗粒与所述锌铝复合氧化物颗粒的质量比为4:1至1:4。
在一个最优选的具体实施方式中,所述酸性分子筛颗粒与所述锌铝复合氧化物颗粒的质量比为2:1至1:2。
在一个具体实施方式中,所述酸性分子筛颗粒和锌铝复合氧化物的粒径各自独立地小于或等于5mm。
在一个具体实施方式中,所述酸性分子筛颗粒和锌铝复合氧化物的粒径各自独立地小于或等于5mm,且大于或等于0.1mm。
在一个优选的具体实施方式中,所述酸性分子筛颗粒和锌铝复合氧化物颗粒的粒径各自独立地小于或等于1mm,且大于或等于0.1mm。
在一个更优选的具体实施方式中,所述颗粒的粒径小于或等于0.5mm,且大于或等于0.1mm。
在一个最优选的具体实施方式中,所述颗粒的粒径小于或等于0.5mm,且大于或等于0.25mm。
在一个具体实施方式中,所述酸性分子筛为具有尺度大于或等于十元环的孔道结构的酸性分子筛。
在一个具体实施方式中,所述酸性分子筛包括具有MFI、BEA、FAU、EMT、MOR、FER和MWW中的至少一种结构的酸性分子筛。
在一个优选的具体实施方式中,所述酸性分子筛为具有MFI结构的酸性分子筛。
在一个更优选的具体实施方式中,所述酸性分子筛为酸性ZSM-5分子筛。
在一个最优选的具体实施方式中,所述酸性分子筛为未经过金属元素改性的酸性ZSM-5分子筛。
在一个具体实施方式中,所述酸性ZSM-5分子筛中硅和铝的原子比为Si/Al=3-200,优选Si/Al=10-40。
在一个具体实施方式中,所述酸性ZSM-5分子筛可经过或不经过脱硅后处理和/或脱铝后处理。
在一个具体实施方式中,所述脱硅后处理是碱溶液处理。常用碱溶液有氢氧化钠、氢氧化钾、氢氧化铵、碳酸钠、碳酸氢钠的水溶液。
在一个具体实施方式中,所述脱铝后处理是酸溶液处理或水蒸气处理。常用酸溶液有盐酸、硝酸、草酸、柠檬酸、醋酸的水溶液。常规的水蒸气处理的温度为400℃至700℃。
在一个具体实施方式中,所述酸性ZSM-5分子筛具有微米结构、纳米结构、微孔结构、介孔-微孔结构中的一种或几种。
在一个具体实施方式中,所述酸性ZSM-5分子筛中可以不含或含有锌、镓、银、铜、铁、钼、镧、铈等金属元素中的一种或者多种。
在一个具体实施方式中,所述酸性ZSM-5分子筛中含有的金属质量分数为0-10%。
在一个具体实施方式中,所述金属在所述酸性分子筛中的位置是分子筛的离子交换位置,或所述酸性分子筛的孔道或表面上,或所述酸性分子筛的骨架上的一种或者多种。
在一个具体实施方式中,所述金属引入所述酸性分子筛的方式是原位合成、浸渍或者离子交换中的一种或者多种。
在一个具体实施方式中,所述催化剂的颗粒形状可以为球形、条形或三叶草形,还可以为大颗粒破碎并筛分后得到的不规则形状。
在一个具体实施方式中,所述颗粒可以为锌铝复合氧化物和酸性分子筛制备过程中未经过进一步成型而自然形成的粉状颗粒。进一步地,所述粉状颗粒的粒径小于或等于5mm;优选地,所述粉状颗粒的粒径小于或等于5mm,且大于或等于0.1mm;更优选地,所述粉状颗粒的粒径小于或等于0.5mm,且大于或等于0.1mm;最优选地,所述粉状颗粒的粒径小于或等于0.5mm,且大于或等于0.25mm。
本发明之二提供了一种制备本发明之一所述的催化剂的方法,包括如下步骤:
1)将含锌元素和铝元素的盐配成水溶液,然后利用沉淀剂的水溶液将所述含锌元素和铝元素的盐中的金属离子共沉淀,老化,再将沉淀物洗涤、干燥后煅烧制得所述锌铝复合氧化物颗粒;
2)将所述锌铝复合氧化物颗粒与所述酸性分子筛颗粒混合均匀。
在一个具体实施方式中,所述沉淀剂包括碳酸钠、碳酸钾、碳酸铵、碳酸氢钠、碳酸氢钾、碳酸氢铵、氨水、氢氧化钠和氢氧化钾中的至少一种。
在一个具体实施方式中,所述混合方式一般通过机械搅拌实现。
在一个具体实施方式中,在所述步骤1)中,共沉淀的条件为:温度为60℃至80℃,pH为6.0至8.0。
在一个具体实施方式中,在所述步骤1)中,在400℃至600℃煅烧1h至4h。
在一个具体实施方式中,在所述步骤1)中,锌元素在水溶液中的浓度为0.1mol/L至2.0mol/L;铝元素在水溶液中的浓度为0.1mol/L至2.0mol/L。
在一个具体实施方式中,还包括在步骤1)之后,步骤2)之前的步骤1-2)将所述锌铝复合氧化物颗粒置于除去锌、铝和放射性元素的其他金属元素的盐溶液中改性。
在一个具体实施方式中,在所述步骤1-2)中,其他金属元素包括锆、铜、铂、钯和铬中的至少一种。
在一个具体实施方式中,在所述步骤1-2)中,所述其他金属元素的单种金属元素在水溶液中的浓度为0.1mol/L至2.0mol/L。
在一个具体实施方式中,在所述步骤1-2)中,锆元素在水溶液中的浓度为0.1mol/L至2.0mol/L;铜元素在水溶液中的浓度为0.1mol/L至2.0mol/L;铂元素在水溶液中的浓度为0.1mol/L至2.0mol/L;钯元素在水溶液中的浓度为0.1mol/L至2.0mol/L;铬元素在水溶液中的浓度为0.1mol/L至2.0mol/L。
本发明之三提供了一种制备芳烃的方法,将含有合成气的原料通过载有催化剂的反应器,在反应条件下制备所述芳烃,其中,所述催化剂为本发明之一中所述的催化剂。
在一个具体实施方式中,所述合成气包括氢气和一氧化碳。
在一个优选的具体实施方式中,在所述合成气中,氢气与一氧化碳的摩尔比为1:9至9:1。
在一个更优选的具体实施方式中,在所述合成气中,氢气与一氧化碳的摩尔比为1:3至3:1。
在一个具体实施方式中,所述反应条件为:反应温度300℃至450℃,反应压力0.5MPa至10.0MPa,合成气标准状态下体积空速2000h-1至20000h-1。
在一个优选的具体实施方式中,所述反应条件为:反应温度380℃至420℃,反应压力3MPa至5MPa,合成气标准状态下体积空速4000h-1至8000h-1。
本发明中,芳烃是指分子中含有苯环结构的碳氢化合物。
优选地,本发明中,芳烃选自苯、甲苯、乙苯、甲乙苯、二甲苯、三甲苯、苯乙烯中的至少一种。
在一个具体实施方式中,所述芳烃选自苯、甲苯、二甲苯中的一种。
在一个优选的具体实施方式中,所述反应器为一个或多个固定床反应器。可以采用连续反应的形式。固定床反应器可以为一个,也可以为多个。当采用多个固定床反应器时,反应器之间可以是串联、并联、或者串联与并联相结合的形式。
在本发明中,“粉末”、“颗粒”和“粉状颗粒”的概念可以互换。
在本发明中,常温是指20℃至30℃的温度范围。
本发明能产生的有益效果包括:
1)本发明的催化剂对芳烃,尤其是BTX选择性较高,性能稳定,且单程寿命长。
2)本发明的催化剂特别适用于芳烃的一步合成,从而降低了分步合成带来的大量的能耗的问题。
3)本发明所提供的方法与现有技术相比,失活的催化剂经过多次重生后性能无明显下降。
具体实施方式
下面结合实施例详述本发明,但本发明并不局限于这些实施例。
如无特别说明,本发明的实施例中的原料均通过商业途径购买。
实施例中分析方法以及转化率、选择性计算如下:
利用带有气体自动进样器、连接TDX-1填充柱的TCD检测器以及连接FFAP毛细管柱的FID检测器的Agilent7890气相色谱仪进行自动分析。
在本发明的一些实施例中,转化率和选择性均基于碳摩尔数进行计算:
一氧化碳转化率=[(进料中的一氧化碳碳摩尔数)-(出料中的一氧化碳碳摩尔数)]÷(进料中的一氧化碳碳摩尔数)×100%
芳烃选择性=(出料中的芳烃碳摩尔数)÷(出料中的所有烃类产物的碳摩尔数)×100%
BTX选择性=(出料中的BTX碳摩尔数)÷(出料中的所有烃类产物碳摩尔数)×100%
下面通过实施例详述本发明,但本发明并不局限于这些实施例。
催化剂制备
实施例1
将Si/Al=19(原子比)的钠型ZSM-5(南开大学催化剂厂)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25mm-0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含0.25mol/L Zn2+与0.50mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,压片、破碎后筛分得到0.25mm-0.50mm尺度的锌铝复合氧化物(ZnAlOx)颗粒。
取上述酸性ZSM-5分子筛颗粒4g与上述ZnAlOx颗粒1g均匀混合,制备成催化剂A。
实施例2
将Si/Al=19(原子比)的钠型ZSM-5(南开大学催化剂厂)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25mm-0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含0.25mol/L Zn2+和0.50mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸铵溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,得到锌铝复合氧化物粉末。利用Cr2+浓度为0.25mol/L的Cr(NO3)3溶液常温浸渍此锌铝复合氧化物粉末24h,干燥,500℃煅烧2h,得到含5%铬改性的锌铝复合氧化物(5%Cr-ZnAlOx)粉末。将5%Cr-ZnAlOx粉末压片、破碎后筛分得到0.25mm-0.50mm尺度颗粒。
取上述酸性ZSM-5分子筛颗粒4g与上述5%Cr-ZnAlOx颗粒1g均匀混合,制备成催化剂B。
实施例3
将Si/Al=19(原子比)的钠型ZSM-5(南开大学催化剂厂)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25mm-0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含0.1mol/L Zn2+和2.0mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,得到锌铝复合氧化物粉末。利用Cu2+浓度为0.4mol/L Cu(NO3)2溶液常温浸渍此锌铝复合氧化物粉末24h,干燥,500℃煅烧2h,得到含7%铜改性的锌铝复合氧化物(7%Cu-ZnAlOx)粉末。将7%Cu-ZnAlOx粉末压片、破碎后筛分得到0.25mm-0.50mm尺度颗粒。
取上述酸性ZSM-5分子筛颗粒4g与上述7%Cu-ZnAlOx颗粒1g均匀混合,制备成催化剂C。
实施例4
将Si/Al=19(原子比)的钠型ZSM-5(南开大学催化剂厂)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25mm-0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含2.0mol/L Zn2+和0.1mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,得到锌铝复合氧化物粉末。利用Cr2+浓度为0.1mol/L的Cr(NO3)3与Zr4+浓度为0.2mol/L的Zr(NO3)4混合溶液常温浸渍此锌铝复合氧化物粉末24h,干燥,500℃煅烧2h,得到含2%铬和4%锆改性的锌铝复合氧化物(2%Cr-4%Zr-ZnAlOx)粉末。将2%Cr-4%Zr-ZnAlOx粉末压片、破碎后筛分得到0.25mm-0.50mm尺度颗粒。
取上述酸性ZSM-5分子筛颗粒4g与上述3%Cr-4%Zr-ZnAlOx颗粒1g均匀混合,制备成催化剂D。
实施例5
将Si/Al=19(原子比)的钠型ZSM-5(南开大学催化剂厂)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25mm-0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含0.1mol/L Zn2+和0.50mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,得到锌铝复合氧化物粉末。利用Pd2+浓度为0.1mol/L的Pd(NO3)3与Zr4+浓度为0.2mol/L的Zr(NO3)4混合溶液常温浸渍此锌铝复合氧化物粉末24h,干燥,500℃煅烧2h,得到含3%钯和4%锆改性的锌铝复合氧化物(3%Pd-4%Zr-ZnAlOx)粉末。将3%Pd-4%Zr-ZnAlOx粉末压片、破碎后筛分得到0.25mm-0.50mm尺度颗粒。
取上述酸性ZSM-5分子筛颗粒4g与上述3%Pd-4%Zr-ZnAlOx颗粒1g均匀混合,制备成催化剂E。
实施例6
将Si/Al=19(原子比)的钠型ZSM-5(南开大学催化剂厂)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,得到酸性ZSM-5分子筛粉末,粉末尺寸小于0.1mm。
配制含0.25mol/L Zn2+与0.50mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,得到锌铝复合氧化物(ZnAlOx)粉末,粉末尺寸小于0.1mm。
取上述酸性ZSM-5分子筛煅烧后的粉末1g与上述ZnAlOx粉末4g均匀混合,压片、破碎后筛分得到0.25~0.50mm尺度催化剂F。
实施例7
将Si/Al=35(原子比)的钠型ZSM-5(奥科公司)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25~0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含0.25mol/L Zn2+与0.50mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,压片、破碎后筛分得到0.25mm-0.50mm尺度的锌铝复合氧化物(ZnAlOx)颗粒。
取上述酸性ZSM-5分子筛颗粒2.5g与上述ZnAlOx颗粒2.5g均匀混合,制备成催化剂G。
实施例8
将Si/Al=40(原子比)的钠型ZSM-5(复旭公司)用0.8mol/L的硝酸铵水溶液在80℃交换3次得到铵型ZSM-5分子筛,在空气气氛下550℃煅烧4h,压片、破碎后筛分得到0.25~0.50mm尺度的酸性ZSM-5分子筛颗粒。
配制含0.25mol/L Zn2+与0.50mol/L Al3+混合硝酸盐水溶液1L,将0.5mol/L的碳酸钠溶液缓慢加入其中,控制共沉淀反应温度为70℃,pH值约为7.0,使金属离子共沉淀,并在此温度下老化2h,过滤、洗涤后干燥,500℃煅烧2h,压片、破碎后筛分得到0.25mm-0.50mm尺度的锌铝复合氧化物(ZnAlOx)颗粒。
取上述酸性ZSM-5分子筛颗粒4g与上述ZnAlOx颗粒1g均匀混合,制备成催化剂H。
实施例9
取实施例1中制备的酸性ZSM-5分子筛颗粒1g与实施例1中制备的ZnAlOx颗粒19g均匀混合,制备成催化剂I。
实施例10
取实施例1中制备的酸性ZSM-5分子筛颗粒19g与实施例1中制备的ZnAlOx颗粒1g均匀混合,制备成催化剂J。
实施例11
将实施例1中的酸性ZSM-5分子筛颗粒的粒径制为4.5mm-5mm,将实施例1中的ZnAlOx颗粒的粒径制为4.5mm-5mm。其他同实施例1。制备成催化剂K。
实施例12
将实施例1中的酸性ZSM-5分子筛颗粒的粒径制为0.8mm-1mm,将实施例1中的ZnAlOx颗粒的粒径制为0.8mm-1mm。其他同实施例1。制备成催化剂L。
实施例13
将实施例1中的酸性ZSM-5分子筛颗粒的粒径制为0.1mm-0.2mm,将实施例1中的ZnAlOx颗粒的粒径制为0.1mm-0.2mm。其他同实施例1。制备成催化剂M。
催化剂性能测试
实施例14
将催化剂A 5g装入内径为8mm的不锈钢反应管内,用50ml/min氢气在300在℃下活化4h,以下条件下反应:反应温度(T)=400℃,反应压力(P)=4.0MPa,标准状况下体积空速(GHSV)=5000h-1,合成气(CO与H2混合气)中氢气的体积分数V(H2)%=50%。反应500h后,用气相色谱分析产物,反应结果见表1。
实施例15-26
反应条件和反应结果见表1。其他操作同实施例14。
表1实施例14-26中的催化反应结果
催化剂重生性能测试
实施例27
将实施例14中失活后的催化剂利用体积分数为2%氧气和98%氮气的混合气,在550℃处理10h,使得催化剂重生一轮,在实施例14的条件下反应。按照同样的方式重生五轮,选取每轮反应500h后的催化活性数据进行比较,结果见表2。
表2实施例27中的催化反应结果
重生次数 | 一氧化碳转化率(%) | 芳烃选择性(%) | BTX选择性(%) | 每轮寿命(h) |
1 | 31.7 | 80.5 | 75.8 | 4000 |
2 | 30.8 | 81.3 | 74.9 | 4200 |
3 | 32.1 | 80.0 | 75.9 | 3900 |
4 | 31.0 | 79.6 | 74.8 | 3700 |
5 | 31.5 | 80.7 | 72.9 | 4100 |
以上所述,仅是本发明的几个实施例,并非对本发明做任何形式的限制,虽然本发明以较佳实施例揭示如上,然而并非用以限制本发明,任何熟悉本专业的技术人员,在不脱离本发明技术方案的范围内,利用上述揭示的技术内容做出些许的变动或修饰均等同于等效实施案例,均属于技术方案范围内。
Claims (10)
1.一种催化剂,其特征在于,所述催化剂包括酸性分子筛颗粒和锌铝复合氧化物颗粒。
2.根据权利要求1所述的催化剂,其特征在于,所述锌铝复合氧化物颗粒中还包括其他金属元素;
优选所述其他金属元素为除去锌、铝和放射性元素的其他金属元素;
更优选所述其他金属元素包括锆、铜、铂、钯和铬中的至少一种。
3.根据权利要求1或2所述的催化剂,其特征在于,所述酸性分子筛颗粒与所述锌铝复合氧化物颗粒的质量比为1:19至19:1;
优选所述酸性分子筛颗粒与所述锌铝复合氧化物颗粒的质量比为4:1至1:4;
最优选所述酸性分子筛颗粒与所述锌铝复合氧化物颗粒的质量比为2:1至1:2。
4.根据权利要求1至3中任意一项所述的催化剂,其特征在于,所述酸性分子筛颗粒和锌铝复合氧化物颗粒的粒径各自独立地小于或等于5mm;
优选所述酸性分子筛颗粒和锌铝复合氧化物颗粒的粒径各自独立地小于或等于1mm,且大于或等于0.1mm。
5.根据权利要求1至4中任意一项所述的催化剂,其特征在于,所述酸性分子筛为具有尺度大于或等于十元环的孔道结构的酸性分子筛。
6.根据权利要求1至5中任意一项所述的催化剂,其特征在于,所述酸性分子筛包括具有MFI、BEA、FAU、EMT、MOR、FER和MWW中的至少一种结构的酸性分子筛;
优选所述酸性分子筛为具有MFI结构的酸性分子筛;
更优选所述酸性分子筛为酸性ZSM-5分子筛;
最优选所述酸性分子筛为未经过金属元素改性的酸性ZSM-5分子筛。
7.一种制备根据权利要求1至6中任意一项所述的催化剂的方法,其特征在于,包括如下步骤:
1)将含锌元素和铝元素的盐配成水溶液,然后利用沉淀剂的水溶液将所述含锌元素和铝元素的盐中的金属离子共沉淀,老化,再将沉淀物洗涤、干燥后煅烧制得所述锌铝复合氧化物颗粒;
2)将所述锌铝复合氧化物颗粒与所述酸性分子筛颗粒混合均匀;
优选所述沉淀剂包括碳酸钠、碳酸钾、碳酸铵、碳酸氢钠、碳酸氢钾、碳酸氢铵、氨水、氢氧化钠和氢氧化钾中的至少一种。
8.一种制备芳烃的方法,其特征在于,将含有合成气的原料通过载有根据权利要求1至6中任意一项所述的催化剂的反应器,在反应条件下制备所述芳烃。
9.根据权利要求8所述的方法,其特征在于,
所述合成气包括氢气和一氧化碳;
优选在所述合成气中,氢气与一氧化碳的摩尔比为1:9至9:1;
更优选在所述合成气中,氢气与一氧化碳的摩尔比为1:3至3:1;
所述反应条件为:反应温度300℃至450℃,反应压力0.5MPa至10.0MPa,合成气标准状态下体积空速2000h-1至20000h-1;
优选所述反应条件为:反应温度380℃至420℃,反应压力3MPa至5MPa,合成气标准状态下体积空速4000h-1至8000h-1。
10.根据权利要求7或8所述的方法,其特征在于,所述芳烃选自苯、甲苯、乙苯、甲乙苯、二甲苯、三甲苯、苯乙烯中的至少一种;
优选所述芳烃选自苯、甲苯、二甲苯中的至少一种。
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