改变“酸醇酯水”传统化学反应途径.pdf

改变“酸+醇 酯+水”传统化学反应途径 潘国祥 倪哲明 周银娟 李小年∗ （浙江工业大学化学工程与材料学院 工业催化研究所，杭州 310032 ） 摘要：本文以苯甲酸甲酯、甲醇、水为起始原料，以 CuMnAl-LDHs 为前躯体制备 Cu-Mn 双功能催化剂，用于苯甲酸甲酯“原位”气相加氢( 甲醇制氢与苯甲酸甲酯加氢耦合)制备苯甲 醛。催化剂表征与产物分析可推测反应机理如下：该新型耦合反应体系的实现，主要通过甲 醇在活性Cu 组分上发生水蒸气重整反应得到活化氢，然后活化氢转移到MnO 组分上，苯 甲酸甲酯发生脱氧加氢生成苯甲醛。而其他副产物含量相对较小，在优化条件下苯甲醛选择 性可达到 95.63%，要明显优于传统的外加氢方法。原位加氢方法，避免了使用外加氢气， 因此在生产工艺及其安全性上具有优势。 关键词：苯甲酸甲酯；苯甲醛；重整制氢；气相加氢 中图分类号：TQ031.4 文献标识码：A 文章编号： （2008 ）00-0000-00 Changing traditional reaction pathway of “acid + alcohol ester + water” through coupling hydrogen production and hydrogenation reaction PAN Guoxiang NI Zheming ZHOU Yinjuan LI Xiaonian* (Institute of catalysis ，College of chemical engineering and materials science， Zhejiang University of Technology ，Hangzhou 310032，Zhejiang ，China) Abstract ：Benzaldehyde was produced through in situ gas-phase hydrogenation, namely coupling hydrogen production from steam reforming of methanol with hydrogenation of methyl benzoate, over Cu-Mn bi-functional catalysts prepared from CuMnAl-LDHs precursor. The reaction mechanism is proposed through catalysts characterization and products analysis. Firstly, the active hydrogen is produced through steam reforming of methanol over Cu component of catalyst. And later, the active hydrogen transfer to the MnO component. On the same time, methyl benzoate happens de-oxygen and hydrogenation to produce benzaldehyde. In this reaction, the content of by-product is relatively minor, and the selectivity of benzaldehyde reaches 95.63%, which has an advantage over traditional external hydrogenation methods. ‘In situ’ hydrogenation can avoid using additional hydrogen, so it has advantage in manufacture and security Key words ：methyl benzoate ；benzaldehyde ；hydrogen production from steam reforming ； gas-