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首页> 外文期刊>Catalysts >High Selectively Catalytic Conversion of Lignin-Based Phenols into para -/ m- Xylene over Pt/HZSM-5
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High Selectively Catalytic Conversion of Lignin-Based Phenols into para -/ m- Xylene over Pt/HZSM-5

机译：Pt / HZSM-5上基于木质素的苯酚的高选择性催化转化为对/间二甲苯

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摘要

High selectively catalytic conversion of lignin-based phenols ( m- cresol, p- cresol, and guaiacol) into para- / m- xylene was performed over Pt/HZSM-5 through hydrodeoxygenation and in situ methylation with methanol. It is found that the p- / m- xylene selectivity is uniformly higher than 21%, and even increase up to 33.5% for m- cresol (with phenols/methanol molar ratio of 1/8). The improved p- / m- xylene selectivity in presence of methanol is attributed to the combined reaction pathways: methylation of m- cresol into xylenols followed by HDO into p- / m- xylene, and HDO of m- cresol into toluene followed by methylation into p- / m- xylene. Comparison of the product distribution over a series of catalysts indicates that both metals and supporters have distinct effect on the p- / m- xylene selectivity.
机译：在Pt / HZSM-5上，通过加氢脱氧和用甲醇原位甲基化，将木质素基酚（间甲酚，对甲酚和愈创木酚）高选择性催化转化为对二甲苯/间二甲苯。发现对-间甲苯酚的对-/间二甲苯选择性始终高于21％，对间甲酚（苯酚/甲醇的摩尔比为1/8）甚至提高到33.5％。在甲醇存在下对苯二甲/间二甲苯选择性的提高归因于以下综合反应途径：间甲酚甲基化为二甲苯酚，然后HDO成为对甲苯/间二甲苯，以及间甲酚HDO转化为甲苯，然后甲基化成对/间二甲苯。在一系列催化剂上产物分布的比较表明，金属和载体都对对-二甲苯间选择性有明显的影响。

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