中文摘要：

研究了Cu-HZSM-5催化剂上的氯苯气相羟化合成苯酚反应及催化剂的失活情况.发现在773 K和水/氯苯体积比为3的反应条件下,1.6%Cu-HZSM-5催化剂上氯苯转化率高达82.4%,苯酚选择性为98.2%,但催化性能随着反应的进行有逐渐下降的趋势.采用X射线衍射、氮气静态吸附、X射线能谱和吡啶吸附红外光谱等手段对反应前后的催化剂进行了表征.结果表明,铜的流失、HZSM-5分子筛骨架脱铝、晶格塌陷和积炭是导致催化剂失活的主要原因.

英文摘要：

Catalytic performance and deactivation of the Cu-HZSM-5 catalyst for gas-phase hydroxylation of chlorobenzene to phenol were studied. Under the conditions of 773 K and water/chlorobenzene volume ratio of 3, a chlorobenzene conversion of 82.4 % and a phenol selectivity of 98.2 % were obtained. Deactivation of the Cu-HZSM-5 catalyst was observed during the reaction. Characterization by X-ray diffraction, N2 static adsorption, energy dispersive X-ray spectroscopy, and infrared spectroscopy of adsorbed pyridine was performed on fresh, used, and regenerated catalysts to study the essence of the catalytic reaction and catalyst deactivation. The leaching of copper from the catalyst, framework dealumination of HZSM-5, and coking were the main causes for the catalyst deactivation.