Hydrogen production through oxidative steam reforming of ethanol over Ni-based catalysts derived from Lab>1鈭?span style='font-style: italic'>xb>Ceb>xb>NiOb>3b> perovskite-type oxides

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• 作者：Sania M. de Lima^a ; ^b ; Adriana M. da Silva^b ; Lí ; dia O.O. da Costa^b ; Jos&eacute ; M. Assaf^c ; Lisiane V. Mattos^d ; Reema Sarkari^e ; A. Venugopal^e ; Fá ; bio B. Noronha^b ; ^{fabio.bellot@int.gov.br}
• 关键词：Perovskite-type oxides ; Hydrogen production ; Ethanol oxidative steam reforming ; Deactivation mechanism ; Nickel catalyst
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：13 June, 2012
• 卷：121-122
• 期：Complete
• 页码：1-9
• 文件大小：1482 K

摘要

This paper investigates the effect of lanthanum substitution by cerium oxide on the performance of Lab>1鈭?em>xb>Ceb>xb>NiOb>3b> (x = 0, 0.05, 0.1, 0.4, 0.7 and 1.0) perovskite-type oxide precursor for the oxidative steam reforming of ethanol. All catalysts are active and selective to hydrogen but carbon deposition occurs except for Lab>0.90b>Ceb>0.10b>NiOb>3b>. Increasing the Ce content decreases the amount of carbon deposited, which passes through a minimum at around 10 wt%of Ce and then increases. The higher resistance to carbon formation on Lab>0.90b>Ceb>0.10b>NiOb>3b> catalyst is due to the smaller Ni crystallite size. Furthermore, the support also plays an important role on catalyst stability during ethanol conversion reaction. The reduced Lab>0.9b>Ceb>0.1b>NiOb>3b> sample exhibits the highest amount of oxygen vacancies, which decreases as ceria content increases. This highly mobile oxygen reacts with carbon species as soon as it forms, and thus keeps the metal surface free of carbon, inhibiting deactivation.