硼酸改性Hβ沸石分子筛催化2-（4’-乙基苯甲酰基）苯甲酸脱水合成2-乙基蒽醌

采用离子交换法制备由不同浓度硼酸改性的Hβ沸石分子筛，并利用XRD、NH₃-TPD和红外-吡啶对催化剂进行表征。结果表明，硼酸改性后的Hβ沸石分子筛弱酸中心强度有所增加，强酸中心强度略有下降，产生的总酸量增加且以L酸为主，L酸中心有利于反应。研究了改性后的Hβ沸石分子筛对2-（4’-乙基苯甲酰基）苯甲酸脱水合成2-乙基蒽醌反应催化性能的影响。系统考察了反应温度、反应时间和进料速率对2-（4’-乙基苯甲酰基）苯甲酸转化率和2-乙基蒽醌选择性的影响，最佳反应条件为：反应温度240 ℃，催化剂用量1.0 g，进料速率0.5 mL·min-1，反应时间1 h。在此条件下，2-（4’-乙基苯甲酰基）苯甲酸转化率为44.59%，2-乙基蒽醌选择性为77.56%。

Catalytic dehydration of 2-(4’-ethylbenzoyl) benzoic acid to 2-ethylanthraquinone over Hβ zeolite molecular sieve modified by boric acid

Hβ zeolite molecular sieves modified by boric acid with different concentrations were prepared by ionic exchange method and were characterized by means of XRD,NH₃-TPD and pyridine desorbed FT-IR.The results showed that after boric acid modification the strength of weak acid sites of Hβ zeolite increased and the strength of strong acid sites decreased; the total acid content increased and L acid was in the majority; L acid center was beneficial to the reaction.The effects of the modified Hβ zeolite,reaction temperature, reaction time and feed speed on the catalytic performance of the catalyst for the dehydration of 2-(4’-ethylbenzoyl)benzoic acid (BEA) to 2-ethylanthraquinone (2-EAQ) were investigated.The results indicated that BEA conversion of 44.59% and the selectivity to 2-EAQ of 77.56% were attained under the optimum condition as follows:reaction temperature 240 ℃,catalyst dosage 1.0 g,feed speed 1.0 mL·min^-1,and reaction time 1 h.