采用脉冲反应技术、原位CO吸附和吡啶吸附红外光谱,考察了Al2O3和SiO2负载的Rh基催化剂上Rh-CeO2相互作用和CH4解离活性. 结果表明,载体酸性对Rh-CeO2相互作用有显著影响. Rh/Al2O3催化剂中添加CeO2增加了载体Al2O3的Lewis酸位,使Al2O3接受电子的能力增强,从而降低Rh的电子密度,有利于CH4解离活化. 相反, Rh/SiO2催化剂中添加CeO2减少了载体SiO2的Lewis酸位和酸强度,使SiO2难于接受电子,导致Rh的电子密度增加,不利于CH4解离活化.
参考文献
[1] | Jin T;Okuhara T;Mains G J;White J M .[J].Journal of Physical Chemistry,1987,91(12):3310. |
[2] | Deleitenburg C.;Kaspar J.;Trovarelli A. .A TEMPERATURE-PROGRAMMED AND TRANSIENT KINETIC STUDY OF CO2 ACTIVATION AND METHANATION OVER CEO2 SUPPORTED NOBLE METALS[J].Journal of Catalysis,1997(1):98-107. |
[3] | Bernal S;Calvino J J;Cauqui M A;Gatica J M Larese C Omil J A P Pintado J M .[J].Catalysis Today,1999,50(02):175. |
[4] | Yang Y L;Li W Z;Xu H Y .[J].Reaction Kinetics & Catalysis Letters,2002,77(01):155. |
[5] | Wang R;Xu H Y;Liu X B;Ge Q J Li W Z .[J].Applied Catalysis A-general,2006,305(02):204. |
[6] | Blyholder G .[J].Journal of Physical Chemistry,1964,68(10):2772. |
[7] | Karpinski Z;Gandhi S N;Sachtler W H M .[J].Journal of Catalysis,1993,141(02):337. |
[8] | Larsen G;Haller G L .[J].Catalysis Letters,1989,3(01):103. |
[9] | Morterra C;Bolis V;Magnacca G .[J].Journal of the Chemical Society Faraday Transactions,1996,92(11):1991. |
[10] | Vazquez A;Lopez T;Gomez R;Bokhimi Morales A Novarot O .[J].Journal of Solid State Chemistry,1997,128(02):161. |
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