改性沉积-沉淀法制备Au/Fe2O3水煤气变换反应催化剂

催化学报 ›› 2008, Vol. 29 ›› Issue (4): 346-350.

改性沉积-沉淀法制备Au/Fe2O3水煤气变换反应催化剂

李锦卫,詹瑛瑛,张凤利,林性贻,郑起

福州大学化肥催化剂国家工程研究中心, 福建福州 350002

收稿日期:2008-04-25 出版日期:2008-04-25 发布日期:2012-03-22

Au/Fe2O3 Water-Gas Shift Catalyst Prepared by Modified Deposition-Precipitation Method

LI Jinwei, ZHAN Yingying, ZHANG Fengli, LIN Xingyi, ZHENG Qi

National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, Fujian, China

Received:2008-04-25 Online:2008-04-25 Published:2012-03-22

摘要/Abstract

摘要： 采用共沉淀法、沉积-沉淀法和改性沉积-沉淀法制备了Au/Fe2O3催化剂,运用N2吸附、X射线衍射、X射线光电子能谱和透射电镜等技术对其进行了表征,考察了制备方法对Au/Fe2O3催化剂水煤气变换反应催化活性的影响. 结果表明,改性沉积-沉淀法制备的催化剂具有最好的催化活性, 150 ℃时CO转化率达82.3%. 该催化剂比表面积较大,金粒子尺寸(3～5 nm)较小且分布均匀. 载体氧化铁以无定形态和结晶态共存,金与载体间存在较强的相互作用,这对催化剂活性的提高起着重要作用.

关键词: 改性沉积-沉淀法, 氧化铁, 负载型金催化剂, 水煤气变换反应

Abstract: The Au/Fe2O3 catalyst was prepared by co-precipitation, deposition-precipitation, and modified deposition-precipitation methods and was characterized byX-raydiffraction,X-rayphotoelectron spectroscopy, and transmission electron microscopy. The catalyst activity for the water-gas shift (WGS) reaction was discussed. Under strictly controlled conditions, the Au/Fe2O3 catalyst prepared by modified deposition-precipitation displayed higher activity for the WGS reaction than that prepared by co-precipitation and deposition-precipitation. In the former case, the CO conversion of 82.3% was obtained with a feed gas of 10%CO/N2 at 150 ℃. Wherein, gold particles of 3-5 nm were highly dispersed on the surface of the Fe2O3 support that existed in an amorphous and crystalline state. A relatively strong interaction between gold particles and the support occurred, which was beneficial for the WGS reaction.

Key words: modified deposition-precipitation, iron oxide, supported gold catalyst, water-gas shift reaction

李锦卫;詹瑛瑛;张凤利;林性贻;郑起. 改性沉积-沉淀法制备Au/Fe2O3水煤气变换反应催化剂[J]. 催化学报, 2008, 29(4): 346-350.

LI Jinwei;ZHAN Yingying;ZHANG Fengli;LIN Xingyi;ZHENG Qi. Au/Fe2O3 Water-Gas Shift Catalyst Prepared by Modified Deposition-Precipitation Method[J]. Chinese Journal of Catalysis, 2008, 29(4): 346-350.

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