Lewis acid solid catalysts for the synthesis of methylenedianiline from aniline and formaldehyde

被引：6

作者：

Cheung, Ka Yan ^{[1
]}

Marquez, Carlos ^{[1
]}

Tomkins, Patrick ^{[1
]}

Parvulescu, Andrei-Nicolae ^{[2
]}

Gordillo, Alvaro ^{[2
]}

De Baerdemaeker, Trees ^{[2
]}

De Vos, Dirk ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Ctr Membrane Separat Adsorpt Catalysis & Spect Su, Celestijnenlaan 200F,Box 2454, B-3001 Leuven, Belgium

[2] BASF SE, Proc Res & Chem Engn, Carl Bosch Str 38, D-67056 Ludwigshafen, Germany

来源：

JOURNAL OF CATALYSIS | 2021年 / 400卷

关键词：

Methylenedianiline; Diaminodiphenylmethane; Aminal; Lewis acid; Polyurethane; DIPHENYL METHANE DADPM; ZEOLITE CATALYSTS;

D O I：

10.1016/j.jcat.2021.05.031

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A catalyst containing Hf4+ and Zn2+ supported on silica has been found to be highly effective for the synthesis of methylenedianiline (MDA), an indispensable precursor in the polyurethane industry. Its performance was further improved when the silica support was replaced by silica-alumina, which resulted in a catalyst that was both active and selective, as indicated by the high MDA yield and high 4,4'-MDA/(2,2'-MDA + 2,4'-MDA) isomer ratio obtained. Furthermore, the catalyst also gave an appreciable oligomeric MDA (OMDA) yield and was noticeably more stable than the zeolites that were used in comparative tests: it could be used in at least five consecutive runs without any significant loss in activity. The combination of Bronsted and Lewis acidity strongly increases the overall activity and yields a catalyst that represents a remarkably stable and reusable alternative to the commonly studied systems for this reaction. (C) 2021 Published by Elsevier Inc.

引用

页码：114 / 123

页数：10

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