Effect of manganese and potassium addition on CeO 2-Al 2O 3 catalyst for hydrogenation of benzoic acid to benzaldehyde

• Published in: Journal of rare earths Vol. 27; no. 5; pp. 723 - 727
• Main Authors: CHENG, Dangguo, HOU, Chunyang, CHEN, Fengqiu, ZHAN, Xiaoli
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2009; Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, China
• Subjects: benzaldehyde; benzoic acid; CeO 2; manganese; potassium; rare earths; CeO 2; benzaldehyde; potassium; benzoic acid; manganese; rare earths; CeO_2
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(08)60323-3

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 investigate the effect of Mn, K addition on CeO 2-Al 2O 3 catalyst. X-ray diffraction (XRD) and H 2-temperature-programmed reduction (H 2-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 2-Al 2O 3 catalyst was developed and investigated in the reaction. The simultaneous addition of Mn and K enhanced not only the catalytic activity but also the capacity to resist the coke formation over catalyst.