The effects of CeO2 on the activity and stability of Pt supported catalysts for methane reforming, as addressed by in situ temperature resolved XAFS and TEM analysis

被引：43
|
作者：
Ferreira, A. P. [1 ]
Zanchet, D. [2 ]
Araujo, J. C. S. [1 ]
Liberatori, J. W. C. [1 ]
Souza-Aguiar, E. F. [4 ]
Noronha, F. B. [3 ]
Bueno, J. M. C. [1 ]
机构：
[1] Univ Fed Sao Carlos, BR-13560 Sao Carlos, SP, Brazil
[2] LNLS, BR-13083970 Campinas, SP, Brazil
[3] Inst Nacl Tecnol, Lab Catalise, BR-21081312 Rio De Janeiro, Brazil
[4] Univ Fed Rio de Janeiro, CENPES PETROBRAS, Rio De Janeiro, Brazil
来源：
JOURNAL OF CATALYSIS | 2009年 / 263卷 / 02期
关键词：
CeO2; Pt-supported catalysts; Synthesis gas; Natural gas; Autothermal reforming of methane; Partial oxidation of methane; In situ XAFS; SYNTHESIS GAS-PRODUCTION; PARTIAL OXIDATION; CERIA CONTENT; PLATINUM; MECHANISM; OXYGEN; PERFORMANCE; REACTIVITY; CLUSTERS; SURFACE;
D O I：
10.1016/j.jcat.2009.02.026
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 effects of Ce as a promoter on the activity and stability of Pt/Al2O3 and Pt/CeO2-Al2O3 Catalysts for autothermal reforming and partial oxidation of methane (POM) were investigated. The Pt/CeO2-Al2O3 catalyst exhibited higher activity and stability than the Pt/Al2O3 catalyst. Analysis by in situ X-ray absorption spectroscopy under POM conditions reveals that Pt is reduced by heating the catalysts to about 730 K. The overall first-shell coordination numbers suggest changes in Pt cluster morphology with increasing temperature. Transmission electron microscopy showed strong Pt agglomeration with time on stream for the Pt/Al2O3 catalyst. The higher stability of the Pt/CeO2-Al2O3 catalyst was attributed to a combination of different properties: (i) hindrance of carbon deposition on the Pt surface for a reactor led with low H2O/CH4 ratio; (ii) interaction of Pt-O-Ce species in the presence of oxygen, inhibiting vapor and diffusion transport Of PtO2 and mainly, (iii) thermal stability of the support, which prevents the loss of surface area, and consequently the sintering of the Pt. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码：335 / 344
页数：10
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