Abstract De-methoxylation of lignin-derived 4-propylguaiacol over molybdenum oxide catalysts on five common supports (SiO2, CeO2, Al2O3, TiO2 and active carbon (AC)) is investigated in a flow system. TEM, H2-TPR and TGA characterizations are conducted to understand the structural features of these Mo catalysts. Positive correlations between electronegativity of the cation in the support and catalyst activity is established, i.e., catalyst support with high cation electronegativity such as Si best promote the conversion of 4-propyiguaicaol into 4-propylphenol. Following this discovery, we further investigated the effect MoO3 loading on SiO2 and the reaction conditions to identify the most suitable parameters for the de-methoxylation of 4-propylguaiacol. The optimized MoO3/SiO2 catalyst constantly afforded >80% selectivity towards 4-propylphenol at >60% conversion for >10 h, and the lost activity could be regenerated by removing coke via simple high temperature calcination.

中文翻译：

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钼基催化剂对木质素单体 4-丙基愈创木酚脱甲氧基化的支持作用

摘要 在流动系统中研究了木质素衍生的 4-丙基愈创木酚在五种常见载体（SiO2、CeO2、Al2O3、TiO2 和活性炭 (AC)）上的氧化钼催化剂上的脱甲氧基化反应。进行 TEM、H2-TPR 和 TGA 表征以了解这些 Mo 催化剂的结构特征。载体中阳离子的电负性与催化剂活性之间建立了正相关，即具有高阳离子电负性的催化剂载体如Si最能促进4-丙基愈创木酚向4-丙基苯酚的转化。在这一发现之后，我们进一步研究了 MoO3 负载对 SiO2 的影响和反应条件，以确定最适合 4-丙基愈创木酚脱甲氧基化的参数。优化的 MoO3/SiO2 催化剂不断提供 >