以类层柱CuZnAl水滑石为前体,经不同温度焙烧制备了一系列甲醇水蒸气重整制氢催化剂.在250℃、水/甲醇比1.3和重时空速2.5 h-1下的反应结果表明,600℃焙烧的催化剂具有优异的活性和稳定性,而≤500℃和≥700℃焙烧后的催化剂活性较差.热重、X射线衍射、傅里叶变换红外光谱和程序升温还原分析结果表明,600℃焙烧时水滑石分解较为完全,析出纳米CuO粒子的同时伴生CuAl2O4尖晶石相,进而在反应过程中对金属Cu纳米粒子和ZnO起到良好的隔离和稳定作用.焙烧温度≥700℃时CuO纳米粒子发生二次团聚,同时CuAl2O4尖晶石相大量生成,造成催化活性位减少,活性较低;而焙烧温度≤500℃时水滑石分解不完全,生成(Cu,Zn)AlxOy(CO3)z复合物且无尖晶石相伴生,造成反应中金属Cu纳米粒子和ZnO聚集,导致催化剂活性较低.
参考文献
[1] | de Wild P.J. .Catalytic production of hydrogen from methanol[J].Catalysis Today,2000(1/2):3-10. |
[2] | Turco M;Bagnasco G;Costantino U;Marmottini F;Montanari T;Ramis G;Busca G .Production of hydrogen from oxidative steam reforming of methanol - I. Preparation and characterization of Cu/ZnO/Al2O3 catalysts from a hydrotalcite-like LDH precursor[J].Journal of Catalysis,2004(1):43-55. |
[3] | Murcia-Mascaros S;Navarro R M;Gomez-Sainero L;Costantino U Nocchetti M Fierro J L G .[J].Journal of Catalysis,2001,198(02):338. |
[4] | 李永峰,林维明,余林.两种甲醇水蒸气重整制氢催化剂的研究[J].燃料化学学报,2004(05):617-621. |
[5] | Davda RR;Shabaker JW;Huber GW;Cortright RD;Dumesic JA .A review of catalytic issues and process conditions for renewable hydrogen and alkanes by aqueous-phase reforming of oxygenated hydrocarbons over supported metal catalysts[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2005(1/2):171-186. |
[6] | Zavoianu R;Birjega R;Pavel O D;Cruceanu A Alifanti M .[J].Applied Catalysis A:General,2005,286(02):211. |
[7] | Cwik A;Fuchs A;Hell Z;Clacens J M .[J].Journal of Molecular Catalysis A:Chemical,2004,219(02):377. |
[8] | Narayanan S;Krishna K .[J].Catalysis Today,1999,49(1-3):57. |
[9] | Wang L S;Murata K;Inada M .[J].Applied Catalysis A:General,2004,257(01):43. |
[10] | Kannan S;Rives V;Knozinger H .[J].Journal of Solid State Chemistry,2004,177(01):319. |
[11] | Melian-Cabrera 1;Granados M L;Fierro J L G .[J].Chemical Physics and Physical Chemistry,2002,4(13):3122. |
[12] | Idem R O;Bakhshi N N .[J].Industrial and Engineering Chemistry Research,1994,33(09):2047. |
[13] | Kurtz M;Wilmer H;Genger T;Hinrichsen O Muhler M .[J].Catalysis Letters,2003,86(1-3):77. |
[14] | Idem R O;Bakhshi N N .[J].Industrial and Engineering Chemistry Research,1995,34(05):1548. |
[15] | Ressler T;Kniep B L;Kasatkin I;Schlogl R .[J].Angewandte Chemie International Edition,2005,44(30):4704. |
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