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首页> 外文期刊>Catalysis science & technology >Promotional effect of HZSM-5 on the catalytic oxidation of toluene over MnOx/HZSM-5 catalysts
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Promotional effect of HZSM-5 on the catalytic oxidation of toluene over MnOx/HZSM-5 catalysts

机译：促销HZSM-5对催化的影响甲苯氧化MnOx / HZSM-5催化剂

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摘要

A series of HZSM-5 supported MnOx catalysts with different manganese contents were prepared by an incipient impregnation method and tested for the catalytic oxidation of toluene. The catalytic results indicate that 10% MnOx/HZSM-5 exhibits the optimum catalytic activity, excellent catalytic durability in dry conditions and high regeneration capability in humid conditions. The dispersion of MnOx species on the HZSM-5 surface significantly reduces coke formation and simultaneously efficiently accelerates the oxidative decomposition of coke deposition during toluene catalytic oxidation. An obvious cooperative action is present on the MnOx/HZSM-5 catalysts for the catalytic oxidation of toluene, which is originally attributed to the excellent toluene adsorption capacity and trapping ability of HZSM-5 as well as the superior redox ability of the MnOx species. The correlation between characterizations and the catalytic results reveals that the mesoporous structure and low-temperature reducibility of MnOx are key factors responsible for the catalytic performance of toluene oxidation. Moreover, the Bronsted acid sites of the HZSM-5 zeolite, as active promoters, play a significant role in the catalytic oxidation of toluene through a comparative analysis with SiO2 and Al2O3 supported MnOx catalysts. The existence of a cooperative action between the redox ability of the MnOx species and the acidic properties of the HZSM-5 zeolite in the MnOx/HZSM-5 catalysts results in a high catalytic activity for the reaction.
机译：一系列HZSM-5 MnOx催化剂与支持不同的锰内容准备好了初期的浸渍方法和测试催化氧化甲苯。结果表明,10% MnOx / HZSM-5展品最佳的催化活性,很好在干旱条件下催化耐久性和高在潮湿的条件下再生能力。分散MnOx物种HZSM-5表面大大降低焦炭的形成同时有效地加速氧化分解可乐中沉积甲苯催化氧化。存在MnOx / HZSM-5合作行动催化剂的催化氧化甲苯、最初归功于出色的是哪一个甲苯吸附能力和捕获能力HZSM-5以及优越的氧化还原能力MnOx的物种。特征和催化的结果表明介孔结构低温的还原性MnOx是关键负责催化性能的因素甲苯的氧化。网站HZSM-5沸石的积极推动者,催化中扮演重要角色通过比较甲苯氧化分析与二氧化硅和氧化铝MnOx支持催化剂。之间的氧化还原能力和MnOx物种HZSM-5沸石的酸性性质MnOx / HZSM-5催化剂在高的结果反应的催化活性。

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