【摘要】 考察了不同温度水蒸气处理的 Hβ分子筛在苯胺甲基化反应中的催化性能 ,及其在不同反应温度、不同进料空速下的变化。结果表明 ,在苯胺甲基化过程中 ,催化剂酸性起了重要作用 ,N-甲基化反应所需的催化活性中心为较弱的酸性中心 ,C-甲基化反应所需的催化活性中心为较强的酸性中心。较高的反应温度有利于 C-甲基化产物的生成 ,较低的反应温度有利于 N-甲基化产物的选择性更多还原

【Abstract】 Methylation of aniline with methanol over hydrothermal treated H β molecular sieves in vapor phase was studied. The reaction was also investigated by varying reaction temprature and MHSV. Catalyst acidity played an important role in the methylation of aniline. N methylation of aniline occurred on weaker acid sites of catalyst, while C methylation of aniline occurred on stronger acid sites. Within the range of 240～340 ℃, higher temperature favored the formation of C methylated products and lower temperature favored the formation of N methylated products.更多还原