A Promising Coupled Process of Pd/¦Ã-Al₂O₃¨CNH₄VO₃ Catalyzing the Hydroxylation of Benzene with Hydrogen Peroxide Produced In?Situ by an Anthraquinone Redox Route

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• 作者：Guosheng Peng ; Zaihui Fu ; Dulin Yin ; Sheng Zhong ; Yan Yang ; Ningya Yu and Donghong Yin
• 关键词：Benzene ; Phenol ; Anthraquinone ; In situ ; Hydrogen peroxide
• 刊名：Catalysis Letters
• 出版年：2007
• 出版时间：October, 2007
• 年：2007
• 卷：118
• 期：3-4
• 页码：270-274
• 全文大小：317 KB

文摘

A coupled process, of which Pd/γ-Al₂O₃–NH₄VO₃ catalyzed the hydroxylation of benzene with hydrogen peroxide produced in situ by an anthraquinone (AQ) redox route, was carried out via a sealed gaseous inner-circulated device under the atmospheric pressure. By means of such process, 0.57 % of benzene conversion, 100 % of phenol selectivity and 26.6 % of anthraquinone-utilized efficiency were achieved upon the mixed Pd/γ-Al₂O₃–NH₄VO₃ (V/Pd molar ratio for 4) in the presence of benzene/acetic acid (4v/10v). Above all, after the coupled reaction system was recycled three times, the accumulated phenol amount could achieve ca. 0.833 mmol and its average value (ca. 0.278 mmol) was slightly higher than phenol amount obtained in the first run (ca. 0.255 mmol), indicating that such coupled reaction system could be recycled efficiently. In addition, a synergistic mechanism was proposed to explain the favorable effect of V compound on the Pd/γ-Al₂O₃ catalyst.