CN108654641B - 一种二氧化碳甲烷重整催化剂及其制备方法 - Google Patents
一种二氧化碳甲烷重整催化剂及其制备方法 Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 86
- KDRIEERWEFJUSB-UHFFFAOYSA-N carbon dioxide;methane Chemical compound C.O=C=O KDRIEERWEFJUSB-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000002407 reforming Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 102
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- 239000004964 aerogel Substances 0.000 claims abstract description 43
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
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- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
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- 229910052751 metal Inorganic materials 0.000 abstract description 21
- 239000002184 metal Substances 0.000 abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 14
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
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- 238000006057 reforming reaction Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 5
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- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 4
- 241000282326 Felis catus Species 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
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- 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 3
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 3
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 3
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- GLMGLOKOFVECMS-UHFFFAOYSA-K C(C)O.[Ru](Cl)(Cl)Cl Chemical compound C(C)O.[Ru](Cl)(Cl)Cl GLMGLOKOFVECMS-UHFFFAOYSA-K 0.000 description 2
- 229910019114 CoAl2O4 Inorganic materials 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000011865 Pt-based catalyst Substances 0.000 description 2
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- 238000002411 thermogravimetry Methods 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000010439 graphite Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- IREVRWRNACELSM-UHFFFAOYSA-J ruthenium(4+);tetrachloride Chemical compound Cl[Ru](Cl)(Cl)Cl IREVRWRNACELSM-UHFFFAOYSA-J 0.000 description 1
- YBCAZPLXEGKKFM-UHFFFAOYSA-K ruthenium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Ru+3] YBCAZPLXEGKKFM-UHFFFAOYSA-K 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Abstract
一种二氧化碳甲烷重整催化剂及其制备方法,本发明首先通过溶胶‑凝胶法制备一定Co质量百分含量的Co‑Mg‑Al醇凝胶,将该醇凝胶超声分散至一定贵金属含量的乙醇溶液中,再将该凝胶‑含贵金属乙醇混合体系进行超临界干燥处理,最后在空气气氛下焙烧获得Co‑贵金属双金属气凝胶催化剂。本发明利用Co、贵金属不同的还原能力及其与载体材料不同的相互作用,通过贵金属/Co比例的变化调节催化剂中活性金属之间以及金属‑载体的相互作用,Co和贵金属产生优异的协同作用,催化活性相比于单金属Co基或贵金属基气凝胶催化剂可提高30%以上;在此区间内Co‑贵金属双金属气凝胶催化剂可获得优异的二氧化碳临氧甲烷重整活性和稳定性。
Description
技术领域
本发明属于二氧化碳和天然气催化领域,特别涉及一种钴-贵金属双金属气凝胶催化剂及其制备技术。
背景技术
近年来温室气体排放量的快速增长导致了全球气候变暖等严重的环境问题,引起了社会各界的极大关注。目前对温室效应贡献最大的两种气体为CO2和CH4。二氧化碳临氧甲烷重整技术能够利用这两种主要的温室气体反应制备可用于化学品生产的合成气,该反应中CO2-CH4重整反应所需的热量能够高效的直接由放热的CH4燃烧(或部分氧化)反应从反应器内部直接供给,因此被认为是一种清洁高效的温室气体减排技术 [T.V. Choudhary, etal., Angew. Chem. Int. Ed. 47 (2008) 1828-1847.]。
Co是二氧化碳临氧甲烷重整反应最常用的催化活性金属,具有催化活性高,廉价的特点。但是在重整反应中Co基催化剂的失活是目前无法进行工业化应用的关键难点。贵金属(Pt、Pd、Ru、Rh等)具有良好的脱氢催化活性和抗积碳能力,一般被认为是比Co更优越的二氧化碳临氧甲烷重整反应活性金属。例如Tomishige等发现在二氧化碳临氧甲烷重整反应中Pt基催化剂活性大大高于贱金属基催化剂活性[Tomishige K, et al., ApplCatal A 2002;233:35-44.]。但是贵金属的价格高昂,限制了其大规模使用。通过在Co基催化剂中掺入贵金属制备双金属催化剂能够在降低贵金属用量的同时有效提升催化剂的活性和稳定性,但是传统方法制备的催化剂活性金属分散度差,性能难以保障,例如采用浸渍法制备的Co-Pt双金属催化剂其催化活性及稳定性甚至低于Co-Ni双金属催化剂[NagaokaK, et al.. Appl Catal A 2004;268:151]。气凝胶催化剂具有较大的比表面积、孔容和热稳定性,有利于获得良好的甲烷重整催化活性 [Yang T, et al., J CO2 Util 2016;16:130-137]。但是气凝胶催化剂中金属载体相互作用与其他方法制备的催化剂存在较大差别[Chen L, et al., Int J Hydrogen Energy 2010;35:8494-8502],因此其性能并不能简单参照其他方法制备的催化剂,而可用于二氧化碳临氧甲烷重整的Co-贵金属双金属气凝胶催化剂,目前尚未见到相关的报道。
综上所述,之前文献公开的方法既没有提供可用于二氧化碳临氧甲烷重整的Co-贵金属双金属气凝胶催化剂的制备方法,也没有阐明影响Co-贵金属双金属气凝胶催化性能的主要机理,因此高性能Co-贵金属双金属气凝胶催化剂的开发仍有待于通过深入的理论分析和大量实验进行研究。
发明内容
本发明的目的是提供一种具有良好二氧化碳临氧甲烷重整催化性能的Co-贵金属双金属气凝胶催化剂的制备方法。
本发明采用的技术方案为:首先通过溶胶-凝胶法制备一定Co质量百分含量的Co-Mg-Al醇凝胶,将该醇凝胶超声分散至一定贵金属含量的乙醇溶液中,再将该凝胶-含贵金属乙醇混合体系进行超临界干燥处理,最后在空气气氛下焙烧获得Co-贵金属双金属气凝胶催化剂。本发明的实质是在超临界干燥过程中同步将与基体中Co含量成一定比例的贵金属沉积在以溶胶-凝胶法制备的含Co凝胶上,同时实现活性金属的结合和催化剂的干燥。发明利用Co、贵金属不同的还原能力及其与载体材料不同的相互作用,通过贵金属/Co比例的变化调节催化剂中活性金属之间以及金属-载体的相互作用,意外地发现Co-贵金属双金属气凝胶催化剂性能并不随贵金属含量的提高而单调上升,而是随Co含量的不同存在不同的贵金属含量最优化区间,在此区间内Co-贵金属双金属气凝胶催化剂可获得优异的二氧化碳临氧甲烷重整活性和稳定性。
本发明的具体过程及参数如下:
Co-Pt双金属气凝胶催化剂成分按质量百分含量计,Co含量为8-18%,MgO含量为5-15%,贵金属含量为0.002-0.5%,余量为Al2O3,所述贵金属为Pt、Pd、Ru、Rh、Ir中的一种或多种;
贵金属与Co的优化质量百分含量关系为:
贵金属%=0.0017(Co%)2-0.072(Co%)+0.75;
上述催化剂的制备方法,包括以下步骤:
(1)以Co、Mg和Al的无机盐为原料,采用溶胶-凝胶法制备Co-Mg-Al水凝胶,并使用去离子水和无水乙醇抽滤洗涤,得到Co-Mg-Al醇凝胶;Co、Mg和Al的无机盐为其硝酸盐、硫酸盐和氯化物中的一种或多种。
(2)使用贵金属的无机盐和无水乙醇,配制贵金属的乙醇溶液,根据Co-Mg-Al凝胶中Co质量百分含量调整乙醇溶液中贵金属的质量,贵金属的无机盐是贵金属氯化物、氯酸盐中的一种或多种。
(3)将步骤(1)所得的Co-Mg-Al醇凝胶混入步骤(2)所得含贵金属的乙醇溶液中,并超声分散10-30min;
(4)将超声分散后的醇凝胶和含贵金属乙醇溶液混合物移入高压反应釜,在260℃,8-10MPa条件下进行超临界干燥2-4h,然后维持温度,以8-15mL/min速度将乙醇放出以干燥产品,制备Co-贵金属-Mg-Al气凝胶粉体;
(5)将Co-贵金属-Mg-Al气凝胶粉体在空气气氛中600-850℃焙烧2-6h,在氢气体积比例为50-100%的氢气/惰性气体混合气体中750-800℃还原2-3h,得到Co-贵金属双金属气凝胶催化剂,所述惰性气体为氮气、氩气或氦气中的一种或多种。
与现有的技术相比,本发明催化剂制备方法具有以下优点:
(1)通过含Co醇凝胶在含贵金属乙醇溶液中超临界处理进行活性金属的结合,使Co和贵金属产生优异的协同作用,催化活性相比于单金属Co基或贵金属基气凝胶催化剂可提高30%以上;
(2)通过优化贵金属/Co质量比例控制了催化剂表面活性物种和还原性能的变化,在提高催化剂表面活性的同时保证了催化剂稳定性;
(3)Co-贵金属双金属气凝胶催化剂具有优异的抗积碳性能,反应后催化剂上仅存在可低温氧化脱除的中间活性碳物种,不积累需500℃以上氧化脱除的不活泼积碳。
附图说明
图1为Co-Pt双金属气凝胶催化剂与单金属及浸渍法催化剂活性对比;
图2为不同Co-Pt比例的Co-Pt双金属气凝胶催化剂性能对比;
图3为Co-Pt双金属气凝胶催化剂反应后样品扫描电镜图;
图4 Co-Pt双金属气凝胶催化剂反应后样品差热分析图;
图5为Co-Ru双金属气凝胶催化剂与单金属催化剂活性对比图;
图6为Co-Ru双金属气凝胶催化剂反应后样品扫描电镜图;
图7为Co-Ru双金属气凝胶反应后样品热重分析图;
图8为Co-Pd双金属气凝胶催化剂与单金属催化剂活性对比图;
图9为不同Co-Pd比例的Co-Pd双金属气凝胶催化剂性能对比图;
图10为Co-Pd双金属气凝胶催化剂反应后样品扫描电镜图。
具体实施方式
下面结合附图和具体实施方式对本发明做进一步的详细说明。
实施例1
以硝酸钴、硝酸镁和硝酸铝为原料,采用溶胶-凝胶法制备Co质量百分含量为10%,MgO质量百分含量为10%的Co-Mg-Al水凝胶,并使用去离子水和无水乙醇抽滤洗涤,得到Co-Mg-Al醇凝胶。使用无水乙醇和氯铂酸铵配制氯铂酸铵的乙醇溶液,控制溶液中Pt与Co-Mg-Al醇凝胶中Co的质量比为0.02。将Co-Mg-Al醇凝胶氯铂酸铵乙醇溶液中,超声分散20min。将超声分散后的醇凝胶和氯铂酸铵乙醇溶液混合物移入高压反应釜,在260℃,9MPa条件下进行超临界干燥3h,然后维持温度,以10mL/min速度将乙醇放出,获得Co-Pt-Mg-Al气凝胶粉体。将Co-Pt-Mg-Al气凝胶粉体在空气气氛中750℃焙烧4小时。
将混合催化剂置于管式反应管内,通入氢氮混合气体在800℃进行预还原2h,所述氢氮混合气体中氢气体积百分含量为80%。预还原完成后通入CO2,CH4和O2的混合反应气体进行二氧化碳甲烷临氧重整反应,混合反应气体中CO2,CH4和O2的体积比为0.4:1:0.3,反应空速为180 L/(h·gcat),CH4转化率为94%,CO2转化率为89%。如图1所示,Co-Pt双金属气凝胶催化剂(图1d)800℃时活性相比于单金属Co基催化剂(图1a)提高50%,相比于单金属Pt基催化剂(图1b)提高55%,相比于Co-Pt双金属浸渍催化剂(图1c)提高20%以上。
不同Pt/Co比例催化剂稳定性对比如图2所示,优化Pt/Co比例催化剂(Pt/Co=0.02)稳定性高于其他比例催化剂。优化比例催化剂上Co以CoAl2O4形式存在,且还原温度降低至800℃。反应后样品的扫描电镜图如图3所示,反应后催化剂上没有检测到石墨碳或碳纤维。反应后催化剂差热分析如图4所示,催化剂表面碳物种可在275℃氧化消除,说明其为反应过程中间活性碳物种。
实施例2
以硫酸钴、硫酸镁和硫酸铝为原料,采用溶胶-凝胶法制备Co质量百分含量为17%,MgO质量百分含量为15%的Co-Mg-Al水凝胶,并使用去离子水和无水乙醇抽滤洗涤,得到Co-Mg-Al醇凝胶。使用无水乙醇和氯铂酸配制氯铂酸的乙醇溶液,控制溶液中Pt与Co-Mg-Al醇凝胶中Co的质量比为0.0035。将Co-Mg-Al醇凝胶氯铂酸乙醇溶液中,超声分散30min。将超声分散后的醇凝胶和氯铂酸乙醇溶液混合物移入高压反应釜,在260℃,10MPa条件下进行超临界干燥2h,然后维持温度,以8mL/min速度将乙醇放出,获得Co-Pt-Mg-Al气凝胶粉体。将Co-Pt-Mg-Al气凝胶粉体在空气气氛中850℃焙烧6小时。
将混合催化剂置于管式反应管内,通入氢氩混合气体在750℃还原2h,所述氢氩混合气体中氢气体积百分含量为50%。还原完成后通入CO2,CH4和O2的混合反应气体进行二氧化碳甲烷临氧重整反应,混合反应气体中CO2,CH4和O2的体积比为0.4:1:0.3,反应空速为108 L/(h·gcat),CH4转化率为93%,CO2转化率为85%。反应后催化剂上没有检测到石墨碳或碳纤维。反应后催化剂差热分析显示催化剂表面碳物种可在300℃氧化消除,说明其为反应过程中间活性碳物种。
实施例3
以硝酸钴、硝酸镁和硝酸铝为原料,采用溶胶-凝胶法制备Co质量百分含量为10%,MgO质量百分含量为10%的Co-Mg-Al水凝胶,并使用去离子水和无水乙醇抽滤洗涤,得到Co-Mg-Al醇凝胶。使用无水乙醇和三氯化钌配制四氯化钌的乙醇溶液,控制溶液中Ru与Co-Mg-Al醇凝胶中Co的质量比为0.02。将Co-Mg-Al醇凝胶放入三氯化钌乙醇溶液中,超声分散20min。将超声分散后的醇凝胶和三氯化钌乙醇溶液混合物移入高压反应釜,在260℃,8MPa条件下进行超临界干燥3h,然后维持温度,以15mL/min速度将乙醇放出,获得Co-Ru-Mg-Al气凝胶粉体。将Co-Ru-Mg-Al气凝胶粉体在空气气氛中750℃焙烧4小时。
将混合催化剂置于管式反应管内,通入氢氮混合气体在800℃进行预还原2h,所述氢氮混合气体中氢气体积百分含量为80%。预还原完成后通入CO2,CH4和O2的混合反应气体进行二氧化碳甲烷临氧重整反应,混合反应气体中CO2,CH4和O2的体积比为0.4:1:0.3,反应空速为180 L/(h·gcat),CH4转化率为90%,CO2转化率为86%。如图5所示,Co-Ru双金属气凝胶催化剂(图5d)800℃时活性相比于单金属Co基催化剂(图5a)提高70%,相比于单金属Ru基催化剂(图5b)提高63%。优化Ru/Co比例催化剂(图5d)活性高于其他比例催化剂(图5c、e)。优化比例催化剂上Co以CoAl2O4形式存在。反应后样品的扫描电镜图如图6所示,反应后催化剂上没有检测到石墨碳或碳纤维。反应后催化剂热重分析如图7所示,催化剂表面碳物种可在357℃氧化消除,说明其为反应过程中间活性碳物种。
实施例4
以硝酸钴、硝酸镁和硝酸铝为原料,采用溶胶-凝胶法制备Co质量百分含量为10%,MgO质量百分含量为10%的Co-Mg-Al水凝胶,并使用去离子水和无水乙醇抽滤洗涤,得到Co-Mg-Al醇凝胶。使用无水乙醇和氯钯酸配制氯钯酸的乙醇溶液,控制溶液中Pd与Co-Mg-Al醇凝胶中Co的质量比为0.02。将Co-Mg-Al醇凝胶放入氯钯酸乙醇溶液中,超声分散20min。将超声分散后的醇凝胶和氯钯酸乙醇溶液混合物移入高压反应釜,在260℃,8.5MPa条件下进行超临界干燥3h,然后维持温度,以12mL/min速度将乙醇放出,获得Co-Pd-Mg-Al气凝胶粉体。将Co-Pd-Mg-Al气凝胶粉体在空气气氛中650℃焙烧4小时。
将混合催化剂置于管式反应管内,通入氢氮混合气体在800℃进行预还原2h,所述氢氮混合气体中氢气体积百分含量为80%。预还原完成后通入CO2,CH4和O2的混合反应气体进行二氧化碳甲烷临氧重整反应,混合反应气体中CO2,CH4和O2的体积比为0.4:1:0.3,反应空速为180 L/(h·gcat),CH4转化率为89.4%,CO2转化率为78.6%。如图8所示,Co-Pd双金属气凝胶催化剂(图8d)800℃时活性相比于单金属Co基(图8a)提高60%,相比于单金属Pd基催化剂(图8b)提高44%。不同Pd/Co比例催化剂稳定性对比如图9所示,优化Pd/Co比例催化剂(Pd/Co=0.02)稳定性高于其他比例催化剂。反应后样品的扫描电镜图如图10所示,反应后催化剂上没有检测到石墨碳或碳纤维,说明其为反应过程中间活性碳物种。
Claims (3)
1.一种二氧化碳甲烷重整催化剂的制备方法,Co-Pt双金属气凝胶催化剂成分按质量百分含量计,Co含量为8-18%,MgO含量为5-15%,贵金属含量为0.002-0.5%,余量为Al2O3,所述贵金属为Pt、Pd、Ru、Rh、Ir中的一种或多种,其特征在于包括以下步骤:
(1)以Co、Mg和Al的无机盐为原料,采用溶胶-凝胶法制备Co-Mg-Al水凝胶,并使用去离子水和无水乙醇抽滤洗涤,得到Co-Mg-Al醇凝胶;Co、Mg和Al的无机盐为其硝酸盐、硫酸盐和氯化物中的一种或多种;
(2)使用贵金属的无机盐和无水乙醇,配制贵金属的乙醇溶液,根据Co-Mg-Al凝胶中Co质量百分含量调整乙醇溶液中贵金属的质量,贵金属的无机盐是贵金属氯化物、氯酸盐中的一种或多种;
(3)将步骤(1)所得的Co-Mg-Al醇凝胶混入步骤(2)所得含贵金属的乙醇溶液中,并超声分散10-30min;
(4)将超声分散后的醇凝胶和含贵金属乙醇溶液混合物移入高压反应釜,在260℃,8-10MPa条件下进行超临界干燥2-4h,然后维持温度,以8-15mL/min速度将乙醇放出以干燥产品,制备Co-贵金属-Mg-Al气凝胶粉体;
(5)将Co-贵金属-Mg-Al气凝胶粉体在空气气氛中600-850℃焙烧2-6h,在氢气体积比例为50-100%的氢气/惰性气氛混合气体中750-800℃还原2-3h,得到Co-贵金属双金属气凝胶催化剂。
2.如权利要求1所述的二氧化碳甲烷重整催化剂的制备方法,其特征在于:贵金属与Co的质量百分含量关系为:
贵金属%=0.0017(Co%)2-0.072(Co%)+0.75。
3.如权利要求1所述的二氧化碳甲烷重整催化剂的制备方法,其特征在于,步骤(5)所述的惰性气氛为氮气、氩气或氦气中的一种或多种。
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