Study On Preparation Of Au Catalysts Supported Pillaring Bentonite And Their Catalytic Performance For Steam Reforming Of Methanol To Produce Hydrogen

In recent years, gold as a new catalytic materials are widely used in the field ofcatalytic, how to choose the suitable carrier and preparation method is an importantfactor in the preparation of highly active gold catalysts. Due to the gold catalyst hasstrong effect of particle size, therefore, it is generally believed when goldnanoparticles size less than10nm to show some catalytic activity. Bentonite has aunique one-dimensional nano lamellar structure, using the confined effect ofbentonitel’s layer structure, through the reasonable preparation methods, the goldnanoparticles confined in between the layers of bentonite, thus can get a new type ofgold nanometer catalysts. In this paper, using TiO2as a crosslinking agent preparationof crosslinked bentonite, and the gold nanoparticles catalyst are prepared bydeposition-precipitation method, using different preparation methods of the Auparticles load in different position of the carrier, and investigate its effects on catalystactivity. Respectively to the doping of Al, Ce, La elements in catalyst, and theperformance of the catalyst were investigated. Using methanol steam reformingreaction as a probe reaction inspects the catalytic activity, and through thecharacterization methods such as XRD, BET and TG inspects the physical andchemical properties of the catalyst. The experimental results show thatAu-Ti/alkali-Ben catalyst are prepared by Au-Ti pillaring species showed highercatalytic activity and thermal stability with the traditional load type goldnanoparticles catalyst. Catalytic activity and thermal stability of the catalyst increasedfurther When Ce and La elements are doped in Au-Ti/alkali-Ben catalystsrespectively. At low temperature, Au-Ti-Ce/alkali-Ben showed higher methanolconversion, hydrogen production rate, CO2selectivity and low CO selectivity, whileat high temperature instead.