Abstract Biogas conversion to syngas by steam reforming was studied over metal-foam-coated Pd–Rh catalysts with variable CeZrO2–Al2O3 support compositions. Catalysts with a higher CeZrO2/Al2O3 ratio exhibited greater CH4 and CO2 conversions and higher H2/CH4 yields, while displaying lower H2/CO ratios and reduced coke formation. Catalytic stability tests over 200 h showed CH4 and CO2 conversion rates of 93–97% and 0–5%, respectively. CeZrO2-modification of the catalyst leads to reduction in the BET area and metal dispersion. Sintering was observed in used catalysts; however there was no clear correlation between the extent of morphological deterioration and the CeZrO2/Al2O3 ratio of the catalyst support.

中文翻译：

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CeZrO 2 -Al 2 O 3 载体组成对金属泡沫包覆Pd-Rh催化剂对蒸汽-沼气重整反应的影响

摘要 研究了在金属泡沫涂层 Pd-Rh 催化剂上通过蒸汽重整将沼气转化为合成气，该催化剂具有可变的 CeZrO2-Al2O3 载体组成。具有较高 CeZrO2/Al2O3 比率的催化剂表现出更高的 CH4 和 CO2 转化率和更高的 H2/CH4 产率，同时显示出较低的 H2/CO 比率和减少的焦炭形成。超过 200 小时的催化稳定性测试显示 CH4 和 CO2 转化率分别为 93-97% 和 0-5%。催化剂的 CeZrO2 改性导致 BET 面积和金属分散的减少。在使用过的催化剂中观察到烧结；然而，形态劣化程度与催化剂载体的 CeZrO2/Al2O3 比率之间没有明显的相关性。