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论文类型：期刊论文

发表时间：2015-08-05

发表刊物：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录刊物：SCIE、EI、Scopus

卷号：54

期号：30

页面范围：7364-7372

ISSN号：0888-5885

摘要：A novel route for the environmentally friendly synthesis of diethyl toluene diamine.(DETDA) was developed by the ethylation of 2,4-toluene diamine (2,4-TDA) over acidic zeolites using ethene and ethanol as the alkylation reagents: Different types of zeolites and reaction conditions were examined Monoethyl toluene diamine (ETDA) Was first generated and then DETDA was formed by ethylation of ETDA. Methyl toluene diamine (TETDA) was the excessive ethylation product. The acidic zeolites were characterized by NH3 temperature programmed desorption, pyridine adsorption Fourier transform infrared spectroscopy, argon/nitrogen physisorption and scanning/transmission electron microscopy. The acidity, especially the Bronsted acid sites on the external surface of zeolites, plays,a more important role in the ethylation than the pore channel does. A small crystal site exposing more acid sites on the external surface is beneficial for the producing of DETDA. The treatment with NaOH generating meso- and macropores and increasing external surface area can also improve the catalytic activity of ZSM-5.