Development of Novel Catalysts for Selective Amination of Alcohols

Download or read book Development of Novel Catalysts for Selective Amination of Alcohols written by Feng Niu and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amines are very important intermediates for chemical industry and life science, which can be synthesized through different traditional routes. Metals based catalytic amination of alcohols via the so-called “hydrogen borrowing” mechanism is a relative efficient and environmental benign way for synthesis of different primary amines. However, there are still some challenges exist, such as high cost of noble metals, low selectivity of primary amine products, and poor stability and recyclability for industrial applications. To solve these problems, different strategies have been applied in this thesis. Carbon deposition produced by catalyst pre-treatment with alcohols under the optimized conditions has been employed for major enhancement of the selectivity of alcohol amination to primary amines (from 30-50 to 80-90%), which arises from steric hindrance in hydrogenation of bulky secondary imines as intermediate products over partially carbon-decorated cobalt nanoparticles. An efficient approach to protect cobalt catalyst from catalytic deactivation by liquid bismuth promotion with different loading content was disclosed for selectively amination of 1-octanol. The N-alkylation of amines by alcohols over a cheap and efficient heterogeneous catalyst-titanium hydroxide was also proposed. The catalyst with mild Brönsted acidity provides the selectivity higher than 90% to secondary amines for functionalized aromatic and aliphatic alcohols and amines at high catalytic activity and stability.