Effect of the synthesis conditions of Ni/Al2O3 catalysts on the biogas decomposition to produce H2-rich gas and carbon nanofibers

被引：20
作者：
de Llobet, S. [1 ]
Pinilla, J. L. [1 ]
Moliner, R. [1 ]
Suelves, I. [1 ]
机构：
[1] CSIC, Inst Carboquim, Zaragoza 50018, Spain
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2015年 / 165卷
关键词：
Biogas; Catalytic decomposition; H2-rich gases; Ni-catalysts; Carbon nanofibers; TEMPERATURE-PROGRAMMED-REDUCTION; METHANE DECOMPOSITION; HYDROGEN-PRODUCTION; BIMETALLIC CATALYSTS; FILAMENTOUS CARBON; NICKEL-CATALYSTS; NI; DEACTIVATION; CH4; NANOTUBES;
D O I：
10.1016/j.apcatb.2014.10.014
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 utilization of biogas as carbon source for the co-production of filamentous-like materials and syngas is proposed. Catalysts with different Ni:Al molar ratios, Al2O3 supports and preparation methods were synthesized. The suitability of the catalysts was analyzed considering activity, stability and carbon yield. Catalysts showed a good performance and similar results according to syngas compositions were obtained. However, some differences related to stability over time and carbon yields were detected. TPR analysis and TEM micrographs of the fresh catalysts revealed the presence of two different Ni particles: large Ni particles with low metal support interaction (MSI) that favoured the formation of encapsulating carbon and small Ni particles inserted in the Al2O3 structure with a greater MSI that lead to nanofilamentous carbons formation. Generally both kinds of Ni particles were observed in all catalysts, however their relative abundance was dramatically affected by the Al2O3 employed, the preparation method and the Ni:Al molar ratio. (C) 2014 Elsevier B.V. All rights reserved.
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页码：457 / 465
页数：9
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