Supported Pd catalysts for solvent-free benzyl alcohol selective oxidation: Effects of calcination pretreatments and reconstruction of Pd sites

详细信息	查看全文 | 推荐本文 |

• 作者：Xueming Wang ; Guangjun Wu ; Naijia Guan ; Landong Li ; ^{lild@nankai.edu.cn}
• 关键词：Supported Pd catalysts ; Selective oxidation ; Calcination pretreatments ; Reconstruction
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：5 April, 2012
• 卷：115-116
• 期：Complete
• 页码：7-15
• 文件大小：1079 K

摘要

Pd catalysts supported on Al₂O₃ and TiO₂ have been prepared by wet impregnation and studied for the solvent-free selective oxidation of benzyl alcohol by molecular oxygen. High activity as well as high selectivity to benzaldehyde can be obtained and the calcination pretreatments show distinct effects on the catalytic activities of supported Pd catalysts. Supported Pd catalysts before and after benzyl alcohol oxidation are characterized by means of XPS, FTIR spectra of CO adsorption and O₂-TPD. The results clearly show that the palladium sites in supported Pd catalysts undergo reconstruction during benzyl alcohol oxidation. Based on the catalytic and characterization results, the possible benzyl alcohol oxidation reaction pathways and the active palladium sites in supported Pd catalysts for benzyl alcohol oxidation are discussed.