Mechanism of Ethanol Steam Reforming Over Pt/(Ni+Ru)-Promoted Oxides by FTIRS In Situ

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• 作者：Vladislav A. Sadykov ; Olga V. Chub ; Yurii A. Chesalov…
• 关键词：Ethanol ; Steam reforming ; Mechanism ; DRIFT in situ ; Surface species ; Reactivity
• 刊名：Topics in Catalysis
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：59
• 期：15-16
• 页码：1332-1342
• 全文大小：1,461 KB
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028
• 卷排序：59

文摘

Mechanism of ethanol steam reforming into syngas over Pt/Pr_0.15Sm_0.15Ce_0.35Zr_0.35O₂ and 10 wt% LaNi_0.9Ru_0.1O₃/Mg-Al₂O₃ catalysts was studied by in situ FTIRS and pulse titration experiments. Surface species (ethoxy, adsorbed ethanol, acetaldehyde, acetate, etc.) were identified and their thermal stability, routers of transformation and reactivity were characterized. Acetate species were shown to be spectators for both types of catalysts. Transformation of ethoxy species by dehydrogenation is a fast step, while the rate-determining stage is the C–C bond rupture in thus formed acetaldehyde on metal sites. For Pt/Pr_0.15Sm_0.15Ce_0.35Zr_0.35O₂ catalyst with a high mobility and reactivity of the surface/lattice oxygen of support, efficient oxidative transformation of acetaldehyde at the metal-support interface provides a high yield of syngas at short contact times in the intermediate temperature range with a minor amount of CH₄ by-product. Transformation of ethoxy species on the acid sites of alumina-supported catalyst produces C₂H₄ and (C₂H₅)₂O via dehydration route dominating at temperatures below 400 °C. In addition, for alumina-supported catalyst acetone is produced via aldol formation in the temperature range 400–500 °C due to combined action of metal and support sites. For this catalyst syngas yield is improved at high temperatures when steam reforming of these byproducts efficiently proceeds accompanied by cracking reactions producing also methane as by-product.