Structural and surface features of PtNi catalysts for reforming of methane with CO2

被引:203
作者
Pawelec, B.
Damyanova, S. [1 ]
Arishtirova, K.
Fierro, J. L. G.
Petrov, L.
机构
[1] Bulgarian Acad Sci, Inst Catalysis, BU-1113 Sofia, Bulgaria
[2] CSIC, Inst Catalisis & Petroleoquim, E-28049 Madrid, Spain
关键词
dry reforming; bimetallic catalysts; nickel; platinum; coke; characterization;
D O I
10.1016/j.apcata.2007.02.017
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of Ni content (1-12 wt%) on the surface and catalytic behavior of bimetallic PtNi catalysts supported on ZSM-5 for reforming of. methane with CO2 was studied. The properties of the catalysts, before and after exposure to reaction conditions, were investigated employing NZ adsorption-desorption isotherms, XRD, TGA/DTA, FTIR spectroscopy of framework vibrations, DRIFT spectroscopy of adsorbed CO, XPS and TPR. It was shown that addition of a small amount of Pt (0.5%) to Ni catalyst leads to formation of small nano-sized NiO particles and easy reduction of NiO. It was found that the amount of Ni precursor plays an important role on the surface and catalytic properties of bimetallic catalysts. The improvement of catalytic activity and stability observed for bimetallic catalyst was attributed to an increase of the nickel metallic dispersion caused by an intimate contact between nickel and platinum at Ni-loading of 6 wt%. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:188 / 201
页数:14
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