工业填料γ-Al2O3催化氧化偏三甲苯制2,3,5-三甲基苯醌

doi:10.11944/j.issn.1000-0518.2016.10.160004

摘要/Abstract

摘要：

以工业填料γ-Al₂O₃为催化剂,30%H₂O₂为氧化剂,冰醋酸为溶剂,一步法催化氧化偏三甲苯(TMB)合成2,3,5-三甲基苯醌(TMBQ)。考察了催化剂用量、反应温度、反应时间、氧化剂用量对该反应的影响。条件优化的结果为:m(γ-Al₂O₃)/m(TMB)=0.005,m(30%H₂O₂)/m(TMB)=2.5,反应时间2 h,反应温度80 ℃,得到TMB转化率为21.3%,TMBQ收率为16.0%,选择性为75.2%。通过XRD、FTIR、SEM、BET等技术手段,证明γ-Al₂O₃结晶度是影响氧化反应催化活性的关键因素。填料γ-Al₂O₃具有较大孔隙结构、比表面积较大、颗粒分布不均匀,为不规则片状,是廉价易得的工业品,具有较好的应用前景。

关键词: 偏三甲苯, 三甲基苯醌, 催化氧化, 氧化铝

Abstract:

2,3,5-Trimethylbenzoquinone(TMBQ) was synthesized by one-step catalytic oxidation of 1,2,4-trimethylbenzene(TMB) with industrial packing γ-alumina as catalyst, acetic acid as solvent, and 30% H₂O₂ as oxidant. The effects of catalyst amount, oxidant dosage, reaction temperature and reaction time were investigated. 21.3% conversion of TMB, 16.0% yield of TMBQ, and 75.2% selectivity were obained under optimal conditions:m(γ-Al₂O₃)/m(TMB)=0.005, m(30%H₂O₂)/m(TMB)=2.5, reaction 2 h at 80 ℃. The catalyst's properties were characterized by SEM, XRD, FTIR and BET, indicating γ-Al₂O₃'s crystallinity is the key factor to catalytic activity. With pore structure, large specific surface area, uneven particle distribution, irregular lamellar structure, packing γ-Al₂O₃ is cheap, readily available and has bright prospects.

Key words: trimethylbenzene, trimethylbenzoquinone, catalytic oxidation, alumina

张天永, 王梦颖, 李彬, 吴武斌, 刘茜. 工业填料γ-Al₂O₃催化氧化偏三甲苯制2,3,5-三甲基苯醌[J]. 应用化学, 2016, 33(10): 1161-1167.

ZHANG Tianyong, WANG Mengying, LI Bin, WU Wubin, LIU Qian. Industrial Packing γ-Al₂O₃Catalyzed Oxidation of 1,2,4-Trimethylbenzene to 2,3,5-Trimethybenzoquinone[J]. Chinese Journal of Applied Chemistry, 2016, 33(10): 1161-1167.

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工业填料γ-Al₂O₃催化氧化偏三甲苯制2,3,5-三甲基苯醌

Industrial Packing γ-Al₂O₃Catalyzed Oxidation of 1,2,4-Trimethylbenzene to 2,3,5-Trimethybenzoquinone

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