Combustion synthesized copper-ion substituted FeAl2O4 (Cu0.1Fe0.9Al2O4): A superior catalyst for methanol steam reforming compared to its impregnated analogue

JOURNAL OF POWER SOURCES

卷:304

Article

Maiti, Sayantani¹  Llorca, Jordi^2,3  Dominguez, Montserrat^2,3  Colussi, Sara⁴  Trovarelli, Alessandro⁴  Priolkar, Kaustubh R.⁵  Aquilanti, Giuliana⁶  Gayen, Arup¹ 

[1] Jadavpur Univ, Dept Chem, Kolkata 700032, India

[2] Univ Politecn Cataluna, Inst Tecn Energet, E-08028 Barcelona, Spain

[3] Univ Politecn Cataluna, Ctr Res Nanoengn, E-08028 Barcelona, Spain

[4] Univ Udine, Dipartimento Chim Fis & Ambiente, I-33100 Udine, Italy

[5] Goa Univ, Dept Phys, Taleigao 403206, Goa, India

[6] Elettra Sincrotrone Trieste SCpA Ss, 14 Km 163-5, I-34149 Trieste, Italy

关键词: Copper;    FeAl2O4;    Ionic substitution;    Methanol steam reforming;    Solution combustion;    Impregnation;   

DOI  :  10.1016/j.jpowsour.2015.11.066

来源: Elsevier

【 摘 要 】

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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