Effect of manganese and potassium addition on CeO_2-Al_2O_3 catalyst for hydrogenation of benzoic acid to benzaldehyde
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：CHEN Fengqiu CHENG Dangguo HOU Chunyang ZHAN Xiaoli
Key words：benzaldehyde; benzoic acid; CeO_2; manganese; potassium; rare earths;
Abstract: A series of Mn/CeO_2-Al_2O_3 and K/CeO_2-Al_2O_3 catalysts for hydrogenation of benzoic acid to benzaldehyde were prepared to in-vestigate the effect of Mn, K addition on CeO_2-Al_2O_3 catalyst. X-ray diffraction (XRD) and H_2-temperature-programmed reduction (H2-TPR) results suggested that the interaction between CeO_2 and MnO_x enhanced the reducibility of catalysts and therefore benzoic acid conversion.The addition of K increased the number of basic number on the catalyst which leads to a high selectivity to benzaldehyde, but excessive addition imposed negative effects on the catalyst performance. A Mn-K/CeO_2Al_2O_3 catalyst was developed and investigated in the reaction. The simul-taneous addition of Mn and K enhanced not only the catalytic activity but also the capacity to resist the coke formation over catalyst.
CHEN Fengqiu1，CHENG Dangguo1，HOU Chunyang1，ZHAN Xiaoli1
(1.Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China)
Abstract:A series of Mn/CeO_2-Al_2O_3 and K/CeO_2-Al_2O_3 catalysts for hydrogenation of benzoic acid to benzaldehyde were prepared to in-vestigate the effect of Mn, K addition on CeO_2-Al_2O_3 catalyst. X-ray diffraction (XRD) and H_2-temperature-programmed reduction (H2-TPR) results suggested that the interaction between CeO_2 and MnO_x enhanced the reducibility of catalysts and therefore benzoic acid conversion.The addition of K increased the number of basic number on the catalyst which leads to a high selectivity to benzaldehyde, but excessive addition imposed negative effects on the catalyst performance. A Mn-K/CeO_2Al_2O_3 catalyst was developed and investigated in the reaction. The simul-taneous addition of Mn and K enhanced not only the catalytic activity but also the capacity to resist the coke formation over catalyst.
Key words:benzaldehyde; benzoic acid; CeO_2; manganese; potassium; rare earths;
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