Methane conversion reactions on Ni catalysts promoted with Rh: Influence of support

被引:73
作者
Lucredio, Alessandra F. [1 ]
Assaf, Jose M. [2 ]
Assaf, Elisabete M. [1 ]
机构
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, BR-13565905 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Catalyst; Nickel; Hydrotalcite; Methane; Reforming; SOLID-SOLUTION CATALYSTS; PARTIAL OXIDATION; HYDROGEN-PRODUCTION; DIMETHYL ETHER; NOBLE-METALS; CO2; TEMPERATURE; ACTIVATION; LANTHANUM; SYSTEMS;
D O I
10.1016/j.apcata.2011.04.035
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
Ni catalysts supported on gamma-Al(2)O(3) and Mg(Al)O were prepared with and without Rh as a promoter and tested in the reforming of methane in the presence of excess methane, simulating a model biogas. The effects of adding synthetic air on the methane conversion and the formation of carbon were assessed. The catalysts were characterized by X-ray spectroscopy (EDS), surface area (BET), X-ray diffraction (XRD), Temperature-programmed reduction (TPR), X-ray absorption near-edge structure (XANES) and XPD. The results showed that in catalysts without Rh, the Ni interacts strongly with the supports, showing high reduction temperatures in TPR tests. The addition of Rh increased the amount of reducible Ni and facilitated the reduction of the species interacting strongly with the support. In the catalytic tests, the samples promoted with Rh suffered higher carbon deposition. The in situ XPD suggested that on the support gamma-Al(2)O(3), the presence of Rh probably led to a segregation of Ni species with time on stream, leading to carbon deposition. On the support MgAlO, the presence of Rh improved the dispersion of Ni, by reducing the Ni(0) crystallite size, suggesting that in this case the carbon deposition was due to a favoring of CH(4) decomposition by Rh. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:156 / 165
页数:10
相关论文
共 25 条
[1]   Noble metal promoted Ni0.03Mg0.97O solid solution catalysts for the reforming of CH4 with CO2 [J].
Chen, YG ;
Yamazaki, O ;
Tomishige, K ;
Fujimoto, K .
CATALYSIS LETTERS, 1996, 39 (1-2) :91-95
[2]  
Chmielarz L, 2003, THERMOCHIM ACTA, V395, P225
[3]   Influence of calcium content in Ni/CaO/γ-Al2O3 catalysts for CO2-reforming of methane [J].
Dias, JAC ;
Assaf, JM .
CATALYSIS TODAY, 2003, 85 (01) :59-68
[4]   Production of the hydrogen by methane steam reforming over nickel catalysts prepared from hydrotalcite precursors [J].
Fonseca, A ;
Assaf, EM .
JOURNAL OF POWER SOURCES, 2005, 142 (1-2) :154-159
[5]   Methanol or ethanol produced from woody biomass: Which is more advantageous? [J].
Hasegawa, Fumio ;
Yokoyama, Shinya ;
Imou, Kenji .
BIORESOURCE TECHNOLOGY, 2010, 101 :S109-S111
[6]   Production of synthesis gas via methane reforming with CO2 on noble metals and small amount of noble-(Rh-) promoted Ni catalysts [J].
Hou, ZY ;
Chen, P ;
Fang, HL ;
Zheng, XM ;
Yashima, T .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2006, 31 (05) :555-561
[7]   Hydrogen production using Ni-Rh on La2O3 as potential low-temperature catalysts for membrane reactors [J].
Irusta, S ;
Cornaglia, LM ;
Lombardo, EA .
JOURNAL OF CATALYSIS, 2002, 210 (01) :7-16
[8]   Nickel catalyst activation in the carbon dioxide reforming of methane Effect of pretreatments [J].
Juan-Juan, J. ;
Roman-Martinez, M. C. ;
Illan-Gomez, M. J. .
APPLIED CATALYSIS A-GENERAL, 2009, 355 (1-2) :27-32
[9]   Biogas upgrade to syn-gas (H2-CO) via dry and oxidative reforming [J].
Lau, C. S. ;
Tsolakis, A. ;
Wyszynski, M. L. .
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2011, 36 (01) :397-404
[10]   Self-activation and self-regenerative activity of trace Rh-doped Ni/Mg(Al)O catalysts in steam reforming of methane [J].
Li, Dalin ;
Shishido, Tetsuya ;
Oumi, Yasunori ;
Sano, Tsuneji ;
Takehira, Katsuomi .
APPLIED CATALYSIS A-GENERAL, 2007, 332 (01) :98-109