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Catalytic Performance and Characterization of Pt‐Co/Al 2 O 3 Catalysts for CO 2 Reforming of CH 4 to Synthesis Gas
Author(s) -
Huang ChuanJing,
Zheng XiaoMing,
Mo LiuYe,
Fei JinHua
Publication year - 2001
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20010190404
Subject(s) - catalysis , calcination , bimetallic strip , chemistry , platinum , syngas , cobalt , dispersion (optics) , inorganic chemistry , catalyst support , organic chemistry , physics , optics
Pt‐Co/Al 2 O 2 catalyst has been studied for CO 2 reforming of CH 4 to synthesis gas. It was found that the catalytic performance of me catalyst was sensitive to calcination temperature. When Co/Al 2 O 3 was calcined at 1473 K prior to adding a small amount of Pt to it, the resulting bimetallic catalyst showed high activity, optimal stability and excellent resistance to carbon deposition, which was more effective to the reaction than Co/Al 2 O 3 and Pt/Al 2 O 3 catalysts. At lower metal loading, catalyst activity decreased in the following order: Pt‐Co/ Al 2 O 3 > Pt/Al 2 O 3 > Co/Al 2 O 3 . With 9% Co, the Co/Al 2 O 3 calcined at 923 K was also active for CO 2 reforming of CH 4 , however, its carbon formation was much more fast man that of the Pt‐Co/Al 2 O 3 catalyst. The XRD results indicated that Pt species well dispersed over the bimetallic catalyst. Its high dispersion was related to the presence of CoAl 2 O 4 , formed during calcining of Co/Al 2 O 3 at high temperature before Pt addition. Promoted by Pt, Co/Al 2 O 4 in the catalyst could be reduced partially even at 923 K, the temperature of pre‐reduction for the reaction, confirmed by TPR. Based on these results, it was considered that the zerovalent platinum with high dispersion over the catalyst surface and the zerovalent cobalt resulting from Co/Al 2 O 4 reduction are responsible for high activity of the Pt‐Co/Al 2 O 3 catalyst, and the remain Co/Al 2 O 4 is beneficial to suppression of carbon deposition over the catalyst.