摘要
添加稀土后的Z111型催化剂其抗析炭性能明显优于传统的工业烃类转化催化剂。由催化剂活性检测、热重技术、程序升温脱附技术、X衍射及电镜观察表明,添加稀土后催化剂的甲烷裂解反应速度减慢,对水蒸汽吸附能力显著改善,因而使得催化剂表面微观水碳比加大,消炭反应速度大于析炭反应速度。添加稀土后催化剂性能改善的根本原因在于稀土与活性金属发生了相互作用,使镍晶发生畸变从而产生更多的活性中心。
The anti—carbon properties of Type Z111 reforming catalyst with the addition of rare earth are obviously superior to that of the traditional commercial hydrocarbon reforming catalyst. Observations by catalyst activity detection, thermogravimetric analysis, PTD technique, X- ray diffraction and electron microscopy have showed that after the addition of rare earth the reaction rate of the catalyst for methane pyrolysis is slowed down and the adsorption capacity of steam is greatly improved so that the microcosmic water/carbon ratio on the catalyst surface is increased and the carbon removing rate is greater than the carbon forming rate. The basic reason for improvement of catalyst properties is the interreaction of rare earth with active metal,hence making the nickel crystal produce distortion to form more active sites.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1992年第5期16-21,共6页
Natural Gas Chemical Industry
