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首次采用化学还原法与机械混合法或浸渍法相结合将非晶态NiB合金固定在Al2O3上,并考察了不同的制备方法和载体对非晶态NiB合金催化加氢及抗硫性能的影响。用XRD和ICP鉴定结构和分析组成;用DSC测定晶化温度;用TPR,TPD,CO化学吸附法等表征了合金催化剂的表面性质。结果表明固定化非晶态NiB合金催化剂活性高、稳定性好、抗硫性能强;浸渍法优于机械混合法。其原因为载体与合金之间存在相互作用,使得低、高温吸附中心消失,中温吸附中心变弱但吸附中心的数量增加。
Amorphous NiB alloy was immobilized on Al2O3 by chemical reduction method combined with mechanical mixing or impregnation method for the first time. The effect of different preparation methods and supports on catalytic hydrogenation and sulfur resistance of amorphous NiB alloy was also investigated. The structure and the composition were characterized by XRD and ICP. The crystallization temperature was determined by DSC. The surface properties of the alloy catalysts were characterized by TPR, TPD and CO chemisorption. The results show that the immobilized amorphous NiB alloy catalyst has high activity, good stability and strong anti-sulfur ability. The impregnation method is superior to the mechanical mixing method. The reason for the interaction between the carrier and the alloy, making the low and high temperature adsorption center disappear, the temperature of the adsorption center weakened but the number of adsorption centers increased.