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氧化铌在含水体系中表现出强酸性,因而得到越来越多的应用。有机羧酸酯是一类重要的化工产品,一般用硫酸等作催化剂,但存在腐蚀设备等问题。我们采用铌酸催化剂进行乙醇和6种羧酸的常压气相酯化反应。实验表明,不仅乙醇转化性高,而且酯的选择率高达100％,同时,也克服了上述液体酸催化剂的缺点,有希望成为酯化反应的有效催化剂。
Niobium oxide shows strong acidity in aqueous systems and is therefore used more and more. Organic carboxylic esters are an important class of chemical products, generally with sulfuric acid as a catalyst, but there are problems such as corrosion of equipment. We use niobium acid catalyst for ethanol and 6 kinds of carboxylic acid at atmospheric pressure esterification. Experiments show that not only high ethanol conversion, but also ester selectivity up to 100%, but also overcome the shortcomings of the above liquid acid catalyst, hopeful as an effective catalyst for esterification.