? Long-term stability of Pt/Ce0.8Me0.2O2-?/Al2O3 (Me 1/4 Gd, Nb, Pr, and Zr) catalysts for steam reforming of methane

被引：13
|
作者：
Azevedo, Israel R. [1 ,2 ,3 ,4 ]
da Silva, Andressa A. A. [1 ]
Xing, Yutao T. [1 ]
Rabelo-Neto, Raimundo C. [2 ]
Luchters, Niels T. J. [4 ]
Fletcher, Jack C. Q. [4 ]
Noronha, Fabio B. [2 ,3 ]
Mattos, Lisiane V. [1 ]
机构：
[1] Fluminense Fed Univ, Dept Chem Engn, Rua Passo Patria 156, BR-24210240 Niteroi, RJ, Brazil
[2] Natl Inst Technol, Catalysis Div, Av Venezuela 82, BR-20081312 Rio De Janeiro, Brazil
[3] Mil Inst Engn, Dept Chem Engn, Praca Gal Tiburcio 80, BR-22290270 Rio De Janeiro, Brazil
[4] Univ Cape Town, Inst Catalysis, Dept Chem Engn, ZA-7701 Rondebosch, South Africa
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2022年 / 47卷 / 35期
关键词：
Steam reforming of methane; Biogas; Hydrogen production; Pt catalysts; Catalyst deactivation; Doped-ceria; PARTIAL OXIDATION; PERFORMANCE; HYDRODEOXYGENATION; CONVERSION; PROMOTER; ALUMINA; DOPANT;
D O I：
10.1016/j.ijhydene.2022.03.067
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：
This study investigated the influence of dopants (Gd, Nb, Pr, and Zr) on the performance of Pt/CexMe1-xO2-g/Al2O3 catalysts for the methane steam reforming (SRM) at 1073 K and at different space velocities. In-situ XRD, in-situ XANES, and Raman spectroscopy revealed the formation of a solid solution on the supports with Gd, Pr and Zr and an improvement in reducibility. No evidence of complete niobium inclusion into the ceria framework was observed and AlNbO4 and CeNbO4 phases were detected. All catalysts exhibited a severe initial deactivation, however, with Pt/CeNb/Al being most stable. Analyses of all spent catalysts revealed a negligible carbon deposition during the catalytic tests. TEM, XRD and N2 physisorption showed a collapse of the alumina structure and sintering of Pt particles as causing the early deactivation. The formation of segregated phases for Nb-doped ceria improved the thermal resistance of alumina and provided a closer contact with Pt crystallites, resulting in better stability. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：15624 / 15640
页数：17
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