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采用吸附法制备了组合型Pt3Sn/Al2O3双金属催化剂,将该催化剂用于芳香硝基化合物原位液相加氢一锅法合成N-烷基芳胺.研究表明,在503K,空速为7.5h-1,水体积分数为5%时,1%(质量分数)Pt3Sn/Al2O3催化剂具有较高的催化性能,硝基苯的转化率为100%,N-乙基苯胺和N,N-二乙基苯胺的总选择性为98.2%.同时,该催化剂对原位液相加氢烷基化反应具有一定普适性,本文研究的14种芳香硝基化合物与低级脂肪醇反应,均具有较高的N-烷基化产率.
A composite Pt3Sn / Al2O3 bimetallic catalyst was prepared by the adsorption method, and the catalyst was used to synthesize N-alkylarylamine by in-situ liquid phase hydrogenation of aromatic nitro compounds. The results show that at 503K, the space velocity is 7.5 h-1, the volume fraction of water is 5%, 1% (mass fraction) Pt3Sn / Al2O3 catalyst has a high catalytic performance, nitrobenzene conversion was 100%, N-ethyl aniline and N, The total selectivity of ethylaniline is 98.2% .At the same time, the catalyst has a certain universal applicability to in situ liquid-phase hydroalkylation. All 14 aromatic nitro compounds studied in this paper reacted with lower aliphatic alcohols, High N-alkylation yield.