CN105562014A - 一种凝胶燃烧法制备的镍基甲烷化催化剂及其应用 - Google Patents
一种凝胶燃烧法制备的镍基甲烷化催化剂及其应用 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 97
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052759 nickel Inorganic materials 0.000 title abstract description 8
- 238000009841 combustion method Methods 0.000 title abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims description 94
- 239000007789 gas Substances 0.000 claims description 31
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 30
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 10
- 230000003179 granulation Effects 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000012752 auxiliary agent Substances 0.000 claims description 8
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 6
- QXPQVUQBEBHHQP-UHFFFAOYSA-N 5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-amine Chemical compound C1CCCC2=C1SC1=C2C(N)=NC=N1 QXPQVUQBEBHHQP-UHFFFAOYSA-N 0.000 claims description 5
- 235000006408 oxalic acid Nutrition 0.000 claims description 5
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 4
- 150000002815 nickel Chemical class 0.000 claims description 4
- 229940078494 nickel acetate Drugs 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- KUBYTSCYMRPPAG-UHFFFAOYSA-N ytterbium(3+);trinitrate Chemical compound [Yb+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O KUBYTSCYMRPPAG-UHFFFAOYSA-N 0.000 claims description 4
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 3
- GAGGCOKRLXYWIV-UHFFFAOYSA-N europium(3+);trinitrate Chemical compound [Eu+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GAGGCOKRLXYWIV-UHFFFAOYSA-N 0.000 claims description 3
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- -1 alkyl biphenyl Chemical compound 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000004305 biphenyl Substances 0.000 claims description 2
- 235000010290 biphenyl Nutrition 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims description 2
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 239000000084 colloidal system Substances 0.000 claims description 2
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- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 2
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- NLQFUUYNQFMIJW-UHFFFAOYSA-N dysprosium(III) oxide Inorganic materials O=[Dy]O[Dy]=O NLQFUUYNQFMIJW-UHFFFAOYSA-N 0.000 abstract 1
- RSEIMSPAXMNYFJ-UHFFFAOYSA-N europium(III) oxide Inorganic materials O=[Eu]O[Eu]=O RSEIMSPAXMNYFJ-UHFFFAOYSA-N 0.000 abstract 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- FIXNOXLJNSSSLJ-UHFFFAOYSA-N ytterbium(III) oxide Inorganic materials O=[Yb]O[Yb]=O FIXNOXLJNSSSLJ-UHFFFAOYSA-N 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 32
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 2
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- GJKFIJKSBFYMQK-UHFFFAOYSA-N lanthanum(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GJKFIJKSBFYMQK-UHFFFAOYSA-N 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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- 239000003245 coal Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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Abstract
一种凝胶燃烧法制备的镍基甲烷化催化剂及其应用。本发明涉及一种凝胶-燃烧法制备的甲烷化镍基催化剂及其制备方法,按质量百分比计,本发明甲烷化催化剂的组成为:活性组分Ni?8~68wt%;载体Al2O3?31~90wt%;助剂为1~20wt%;所述助剂为Yb2O3、La2O3、Dy2O3、Eu2O3中的一种或两种;所述催化剂的粒度为60~250目,经还原后催化剂的金属表面积为5~30m2/g,金属镍分散度为1.5~9.0%。本发明的甲烷化催化剂使得活性组分在催化剂载体上的分散更加均匀,相互作用更强,且在浆态床甲烷化反应中表现出了高活性和选择性。
Description
技术领域
本发明属于一种镍基甲烷化催化剂的制备方法,尤其涉及一种通过凝胶燃烧法制备的用于浆态床CO甲烷化的镍基催化剂的制备方法及应用。
背景技术
天然气是一种清洁、安全、便捷的优质能源。由于我国经济的发展和能源结构的调整,天然气用量逐年上升,而产量增长相对较慢,天然气供应缺口逐年增加,需通过进口等途径弥补,影响了我国的能源安全。发展煤制天然气可以缓解我国天然气供应不足的问题,部分替代进口天然气,对我国能源安全和节能减排具有重要意义。高浓度CO甲烷化反应过程中会放出大量热,反应器绝热温升大,极易造成床层飞温和催化剂的烧结、积碳导致失活,影响催化剂使用寿命。现有甲烷化工业生产中,主要应用固定床反应器,甲烷化催化剂也主要针对固定床特点制备。在固定床反应器中,一般采用列管式换热器移除反应热,或采用多个固定床反应器串联使用,降低单个反应器内原料气的单程转化率,同时通过多步气体循环逐级冷却控制床层温度,这些措施导致工艺过程能量消耗增加,运行费用大幅上升。与固定床反应器相比,浆态床反应器引入导热系数大、热容大的惰性液相热载体,形成了高度湍动的气-液-固三相体系,床层接近等温,避免了催化剂烧结和积碳,延长了催化剂使用寿命。专利CN101979475A和CN101979476A公开了一种浆态床甲烷化工艺,该工艺在甲烷化反应过程中引入导热系数大、热容大的液相组分,使催化剂组分均匀分散在惰性液体中,实现了反应体系的等温,避免了固定床甲烷化反应中的床层飞温和催化剂的烧结失活问题,且该工艺具有单程转化率高等优点。浆态床甲烷化工艺具有与固定床工艺不同的特点,需要开发适用于该工艺的催化剂。
目前工业上应用的甲烷化催化剂多为浸渍法制备的负载型镍基催化剂,该方法制备所得的催化剂活性组分与载体的相互作用力较弱,Ni晶粒在载体表面容易团聚,且催化剂活性组分容易从载体表面脱落,降低催化剂的催化剂稳定性。
采用溶胶凝胶法制备催化剂可使凝胶形成过程中活性组分与载体实现分子水平的均匀混合,活性组分分散性较好,所得的催化剂颗粒粒径小,比表面积大,提高了催化剂的活性和稳定性。张玉红等(催化学报,1998,19(6):550-554)采用溶胶凝胶法制备了一系列NiO/γ-Al2O3催化剂用于甲烷部分氧化制合成气,该方法制备的催化剂粒度小、活性组分在载体表面分散度高,活性组分与载体间相互作用较强,催化剂稳定性好。
但是,溶胶凝胶法也存在一些缺陷,如催化剂的催化性能受反应物和催化剂孔径匹配情况的限制。凝胶中存在大量微孔,在干燥过程中产生的收缩效应使孔径和比表面积减小,限制了反应物和产物在催化剂上的扩散,减少了活性位使得催化剂活性降低。其次,由于凝胶陈化过程耗时较长,溶胶凝胶法制备催化剂过程一般需数天,不利于该方法的工业化推广。
发明内容:
本发明目的是提供一种制备简单,合成时间短,催化性能稳定的适用于浆态床甲烷化的镍基催化剂的制法及其应用。
为达上述目的,本发明通过先沉淀后燃烧的方法制备镍基催化剂。
一种浆态床镍基甲烷化催化剂,其质量百分比组成为:活性组分Ni8~68wt%;载体Al2O331~90wt%;助剂为1~20wt%;所述助剂为Yb2O3、La2O3、Dy2O3、Eu2O3中的一种或两种;所述催化剂的粒度为60~250目,经还原后催化剂的金属镍表面积为5~30m2/g,金属镍分散度为1.5~9.0%。
所述催化剂通过凝胶—燃烧法制备,具体制备方法如下:
1)分别配制溶液浓度为0.14~0.52g/mL的镍盐溶液以及溶液浓度为0.0~10.15g/mL的助剂前驱体的硝酸盐水溶液,同时配制溶液浓度为0.04~0.14g/mL的燃料水溶液;
2)将上述溶液滴加至体积10~60mL、浓度为0.01~0.45g/mL异丙醇铝的乙醇溶液中;随后,向溶液中滴加5~25mL醋酸,控制溶液pH值,将混合液置于一定温度的水浴中,缓慢搅拌至凝胶;
3)将上述凝胶在一定温度下加热点燃,将燃烧后余下粉末收集,研磨,造粒,即得到甲烷化镍基催化剂前驱体;
4)在固定床中用还原气进行还原2~8h,即得到催化剂。
如上所述的镍盐为硝酸镍、醋酸镍或氯化镍中的一种。
如上所述的助剂前驱体为硝酸镱、硝酸镧、硝酸镝或硝酸铕中的一种或两种。
如上所述的燃料为草酸、柠檬酸或甘露醇中的一种或两种。
如上所述的水浴的温度为50~80℃、溶液pH值为3~5。
如上所述的胶体加热温度为300~600℃。
如上所述的还原气由体积组成为5~85%H2与15~95%N2所组成,还原温度为350~700℃,还原压力为0.1~1.5MPa,还原气空速为1000~12000mL/(g·h)。
将本发明的浆态床镍基甲烷化催化剂应用于浆态床反应器进行合成气甲烷化,反应条件为:以石蜡烃、烷基联苯型导热油或甲基硅油等导热系数大、热容大、沸点高的物质作为惰性液相组分,反应温度250~350℃;反应压力0.5~4.0MPa;空速1000~4000mL/(g·h);浆态床催化剂浓度0.013~0.05g/mL,原料气H2/CO体积比为2.5~4.0。
本发明的技术优势如下:
本发明公开了一种先形成凝胶,后燃烧制备镍基催化剂的方法。本发明具有的实质性特点和进步在于:
(1)凝胶形成过程中,活性组分与载体实现了均匀混合,活性组分高度分散在载体上。
(2)凝胶燃烧过程中产生了大量气体,在催化剂内部产生丰富的孔结构,增大了孔径,减少了颗粒间的团聚,所得产物粒度小,比表面积大,分散性好。
(3)避免了催化剂在制备过程中长时间的老化、烘干和焙烧环节,制备周期大幅缩短,能耗降低。
具体实施方式
下面通过具体实施例进一步描述本专利中公开的制备方法,但本发明并不受下述实施例的限制。本发明以一氧化碳和氢气合成甲烷的反应为催化剂的探针反应。
实施例1
(1)分别配制溶液浓度为0.165g/mL的硝酸镍溶液,溶液浓度为0.03g/mL的硝酸镝溶液以及溶液浓度为0.125g/mL的柠檬酸溶液。
(2)将上述溶液滴加至35mL浓度为0.39g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加10mL醋酸,调节溶液pH值至4,将混合液置于70℃的水浴中,缓慢搅拌至凝胶。
(3)将上述凝胶放入马弗炉中,加热至300℃燃烧,将燃烧后余下粉末收集,研磨后造粒至80120目。
(4)在气体体积组成为5%H2与95%N2,空速为2000mL/(g·h),压力为0.2MPa的固定床中550℃条件下还原4h,即得到甲烷化镍基催化剂,该催化剂的组成为:活性组分Ni18wt.%,Al2O379wt.%,Dy2O33wt.%
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如下:
将一定质量上述催化剂和120mL惰性液体介质注入250mL浆态床反应釜中。在室温条件下,用N2向系统充压至反应压力,以10℃/min升温至反应温度,然后向反应器通入25mL/minCO和一定量的H2,并在750r/min搅拌下开始反应,反应一段时间后取样分析。
实施例2
(1)分别配制溶液浓度为0.25g/mL的醋酸镍溶液,溶液浓度为0.01g/mL的硝酸镱溶液以及溶液浓度为0.14g/mL的甘露醇溶液。
(2)将上述溶液滴加至40mL浓度为0.43g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加15mL醋酸,调节溶液pH值至3,将混合液置于50℃的水浴中,缓慢搅拌至凝胶。
(3)将上述凝胶放入马弗炉中,加热至600℃燃烧,将燃烧后余下粉末收集,研磨后造粒至160~200目。
(4)在气体体积组成为35%H2与65%N2,空速为3000mL/(g·h),压力为0.5MPa的固定床中650℃条件下还原6h,即得到甲烷化镍基催化剂,该催化剂组成为:活性组分Ni30wt.%,Al2O369wt.%,Yb2O31wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
实施例3
(1)分别配制溶液浓度为0.23g/mL的硝酸镍溶液,溶液浓度为0.15g/mL的硝酸镝溶液以及溶液浓度为0.09g/mL的草酸溶液。
(2)将上述溶液滴加至50mL浓度为0.35g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加8mL醋酸,调节溶液pH值至5,将混合液置于80℃的水浴中,缓慢搅拌至凝胶。
(3)将凝胶放入马弗炉中,加热至400℃燃烧,将燃烧后余下粉末收集,研磨后造粒至120~160目。
(4)在气体体积组成为80%H2与20%N2,空速为7000mL/(g·h),压力为0.4MPa的固定床中500℃条件下还原8h,即得到甲烷化镍基催化剂,该催化剂组成为:活性组分Ni22wt.%,Al2O358wt.%,Dy2O315wt.%,La2O35wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
实施例4
(1)分别配制溶液浓度为0.14g/mL的硝酸镍溶液,溶液浓度为0.08g/mL的硝酸镧溶液以及溶液浓度为0.07g/mL的甘露醇溶液。
(2)将上述溶液滴加至20mL浓度为0.45g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加20mL醋酸,调节溶液pH值至3,将混合液置于60℃的水浴中,缓慢搅拌至凝胶。
(3)将上述凝胶放入马弗炉中,加热至500℃燃烧,将燃烧后余下粉末收集,研磨后造粒至100~140目。
(4)在气体体积组成为60%H2与40%N2,空速为8000mL/(g·h),压力为0.6MPa的固定床中600℃条件下还原5h,即得到甲烷化镍基催化剂,该催化剂组成为:活性组分Ni8wt.%,Al2O382wt.%,La2O310wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
实施例5
(1)分别配制溶液浓度为0.27g/mL的醋酸镍溶液,溶液浓度为0.03g/mL的硝酸铕溶液以及溶液浓度为0.05g/mL的草酸溶液。
(2)将上述溶液滴加至20mL浓度为0.40g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加5mL醋酸,调节溶液pH值至5,将混合液置于50℃的水浴中,缓慢搅拌至凝胶。
(3)将上述凝胶放入马弗炉中,加热至400℃燃烧,将燃烧后余下粉末收集,研磨后造粒至80~120目。
(4)在气体体积组成为40%H2与60%N2,空速为3000mL/(g·h),压力为1.0MPa的固定床中550℃条件下还原7h,即得到甲烷化镍基催化剂,该催化剂组成为:活性组分Ni38wt.%,Al2O354wt.%,Eu2O36wt.%,La2O32wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
实施例6
(1)分别配制溶液浓度为0.52g/mL的氯化镍溶液,溶液浓度为0.02g/mL的硝酸镧溶液以及溶液浓度为0.13g/mL的柠檬酸溶液。
(2)将上述溶液滴加至30mL浓度为0.20g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加15mL醋酸,调节溶液pH值至4,将混合液置于55℃的水浴中,缓慢搅拌至凝胶。
(3)将上述凝胶放入马弗炉中,加热至350℃燃烧,将燃烧后余下粉末收集,研磨后造粒至100~140目。
(4)在气体体积组成为55%H2与45%N2,空速为10000mL/(g·h),压力为1.5MPa的固定床中400℃条件下还原3h,即得到甲烷化镍基催化剂,该催化剂组成为:活性组分Ni60wt.%,Al2O339wt.%,La2O31wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
实施例7
(1)分别配制溶液浓度为0.31g/mL的硝酸镍溶液,溶液浓度为0.01g/mL的硝酸镱溶液以及溶液浓度为0.04g/mL的草酸溶液。
(2)将上述溶液滴加至50mL浓度为0.23g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加15mL醋酸,调节溶液pH值至5,将混合液置于65℃的水浴中,缓慢搅拌至凝胶。
(3)将上述凝胶凝胶放入马弗炉中,加热至500℃燃烧,将燃烧后余下粉末收集,研磨后造粒至200~240目。
(4)在气体体积组成为70%H2与30%N2,空速为4000mL/(g·h),压力为1.2MPa的固定床中350℃条件下还原4h,即得到甲烷化镍基催化剂,该催化剂组成为:活性组分Ni40wt.%,Al2O358wt.%,Yb2O22wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
对比例1
溶胶凝胶法制备的甲烷化镍基催化剂,具体步骤如下:
分别配制溶液浓度为0.165g/mL的硝酸镍溶液,溶液浓度为0.03g/mL的硝酸镝溶液以及溶液浓度为0.125g/mL的柠檬酸溶液。将上述溶液滴加至35mL浓度为0.39g/mL的异丙醇铝的乙醇溶液。随后,向溶液中滴加10mL醋酸,调节溶液pH至4。混合液置于70℃水浴中搅拌1h,室温放置两天使其凝结成为凝胶,再于70℃水浴中老化1h。将得到的凝胶置于110℃烘箱中干燥12h,得到的固体研磨后造粒至80120目,放入450℃马弗炉焙烧4h。
在气体体积组成为5%H2与95%N2,空速为2000mL/(g·h),压力为0.2MPa的固定床中550℃条件下还原4h,即得到甲烷化镍基催化剂,,该催化剂的组成为:Ni18wt.%,Al2O379wt.%,Dy2O33wt.%。
催化剂在合成气制甲烷反应中的活性评价具体条件及结果见附表1。具体步骤如实施例1所示。
附表说明:
表1为各实施例和对比例1制备的催化剂在合成气甲烷化反应的评价结果。
表2为实施例1和对比例1制备的催化剂的比表面积和粒径测定结果比较。
附表1
附表2
Claims (9)
1.一种浆态床镍基甲烷化催化剂,其质量百分比组成为:活性组分Ni868wt%;载体Al2O33190wt%;助剂为120wt%;所述助剂为Yb2O3、La2O3、Dy2O3、Eu2O3中的一种或两种;所述催化剂的粒度为60~250目,经还原后催化剂的金属镍表面积为5~30m2/g,金属镍分散度为1.5~9.0%。
2.如权利要求1所述的浆态床镍基甲烷化催化剂,其特征在于,所述催化剂的制备方法,包括如下步骤:
1)分别配制溶液浓度为0.140.52g/mL的镍盐溶液以及溶液浓度为0.010.15g/mL的助剂前驱体的硝酸盐水溶液,同时配制溶液浓度为0.040.14g/mL的燃料水溶液;
2)将上述溶液滴加至体积1060mL、浓度为0.010.45g/mL异丙醇铝的乙醇溶液中;随后,向溶液中滴加525mL醋酸,控制溶液pH值,将混合液置于一定温度的水浴中,缓慢搅拌至凝胶;
3)将上述凝胶在一定温度下加热点燃,将燃烧后余下粉末收集,研磨,造粒,即得到甲烷化镍基催化剂前驱体;
4)在固定床中用还原气进行还原28h,即得到催化剂。
3.如权利要求2所述的浆态床镍基甲烷化催化剂,其特征在于,在催化剂的制备过程中,所述的镍盐为硝酸镍、醋酸镍或氯化镍中的一种。
4.如权利要求2所述的浆态床镍基甲烷化催化剂,其特征在于,在催化剂的制备过程中,所述的助剂前驱体为硝酸镱、硝酸镧、硝酸镝或硝酸铕中的一种或两种。
5.如权利要求2所述的浆态床镍基甲烷化催化剂,其特征在于,在催化剂的制备过程中,所述的燃料为草酸、柠檬酸或甘露醇中的一种或两种。
6.如权利要求2所述的浆态床镍基甲烷化催化剂,其特征在于,在步骤2)中,水浴的温度为5080℃、溶液pH值为35。
7.如权利要求2所述的浆态床镍基甲烷化催化剂,其特征在于,在步骤3)中,胶体的加热温度为300600℃。
8.如权利要求2所述的浆态床镍基甲烷化催化剂,其特征在于,在步骤4)中,所述还原气由体积组成为5~85%H2与15~95%N2所组成,还原温度为350~700℃,还原压力为0.1~1.5MPa,还原气空速为1000~12000mL/(g·h)。
9.将上述任一项权利要求所述的浆态床镍基甲烷化催化剂应用于浆态床反应器进行合成气甲烷化,反应条件为:以石蜡烃、烷基联苯型导热油或甲基硅油等导热系数大、热容大、沸点高的物质作为惰性液相组分,反应温度250~350℃;反应压力0.5~4.0MPa;空速1000~4000mL/(g·h);浆态床催化剂浓度0.013~0.05g/mL,原料气H2/CO体积比为2.5~4.0。
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