期刊
JOURNAL OF POWER SOURCES
卷 304, 期 -, 页码 319-331出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.11.066
关键词
Copper; FeAl2O4; Ionic substitution; Methanol steam reforming; Solution combustion; Impregnation
资金
- Department of Science and Technology, Government of India [SR/S1/PC-28/2010]
- DST
- Italian Ministry under FIRB [RBFR10S4OW]
- Spanish Ministry under MINECO [ENE2012-36368]
A series of copper ion substituted MAl2O4 (M = Mg, Mn, Fe and Zn) spinels is prepared by a single step solution combustion synthesis (SCS) and tested for methanol steam reforming (MSR). The copper ion substituted Cu0.1Fe0.9Al2O4 appears to be the most active, showing similar to 98% methanol conversion at 300 degrees C with similar to 5% CO selectivity at GHSV = 30,000 h(-1) and H2O:CH3OH =1.1. The analogous impregnated catalyst, CuO (10 at%)/FeAl2O4, is found to be much less active. These materials are characterized by XRD, H-2-TPR, BET, HRTEM, XPS and XANES analyses. Spinel phase formation is highly facilitated upon Cu-ion substitution and Cu loading beyond 10 at% leads to the formation of CuO as an additional phase. The ionic substitution of copper in FeAl2O4 leads to the highly crystalline SCS catalyst containing Cu2+ ion sites that are shown to be more active than the dispersed CuO nano-crystallites on the FeAl2O4 impregnated catalyst, despite its lower surface area. The as prepared SCS catalyst contains also a portion of copper as Cu1+ that increases when subjected to reforming atmosphere. The MSR activity of the SCS catalyst decreases with time-on-stream due to the sintering of catalyst crystallites as established from XPS and HRTEM analyses. (C) 2015 Elsevier B.V. All rights reserved.
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