Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

Catalysts

Bernay Cifuentes²  Manuel F. Valero²  Juan A. Conesa¹  Martha Cobo² 

[1] Department of Chemical Engineering, Universidad de Alicante, P.O. Box 99, Alicante E-03080, Spain; E-Mail:;Energy, Materials and Environment Laboratory, Department of Chemical Engineering, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá 250001, Colombia; E-Mails:

关键词: basic supports;    ethanol;    hydrogen;    Rh-Pt catalyst;    steam reforming;   

DOI  :  10.3390/catal5041872

来源: mdpi

【 摘 要 】

CeO₂-, ZrO₂-, and La₂O₃-supported Rh-Pt catalysts were tested to assess their ability to catalyze the steam reforming of ethanol (SRE) for H₂ production. SRE activity tests were performed using EtOH:H₂O:N₂ (molar ratio 1:3:51) at a gaseous space velocity of 70,600 h⁻¹ between 400 and 700 °C at atmospheric pressure. The SRE stability of the catalysts was tested at 700 °C for 27 h time on stream under the same conditions. RhPt/CeO₂, which showed the best performance in the stability test, also produced the highest H₂ yield above 600 °C, followed by RhPt/La₂O₃ and RhPt/ZrO₂. The fresh and aged catalysts were characterized by TEM, XPS, and TGA. The higher H₂ selectivity of RhPt/CeO₂ was ascribed to the formation of small (~5 nm) and stable particles probably consistent of Rh-Pt alloys with a Pt surface enrichment. Both metals were oxidized and acted as an almost constant active phase during the stability test owing to strong metal-support interactions, as well as the superior oxygen mobility of the support. The TGA results confirmed the absence of carbonaceous residues in all the aged catalysts.

【 授权许可】

CC BY   
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