文档介绍：Abstract
Coal is the main primary energy in China, which is chiefly distributed in the western traffic underserved areas. Long-distances transportation of coal in our country makes the utilization of coal face the problems of high cost, serious environmental pollution and other produced wastage. At present, the in situ coversion of coal using green and environmental technique is very important. bination of gasification and methanation could make the coal be transformed into natural gas and transported by pipelines. This way could solve the above mentioned problems. Thus, this strategy is with a vital significance to our country. Through the exploration by scientists, the coal gasification technology is now a mature technique, while the challenge is to develop high activity and stability catalyst to realize syngas methanation with high capacity and efficiency.
In this paper, the catalyst preparation methods and influence factors of Ni content, additives of Mg, hydrothermal temperature and hydrothermal time had been carried out. The results showed that the high mechanical strength and high activity of catalyst could be produced by co-precipitation and hydrothermal method. When the Ni content was 20 wt%, the catalyst activity was excellent. The additives of Mg could increase the catalyst activity slightly, and be conducive to the stability of the catalyst structure. While the hydrothermal temperature and time had few effects on the catalytic activity. Compared mercial production of N182 catalyst(40 wt% Ni), the catalyst preparation in the experiment needed lower content of Ni and higher activity.
As to the Ni-Mg/Al2O3 catalyst prepared by an bining co-precipitation and hydrothermal methods, the influences of calcination and reduction on catalyst structure and performance for methanation were investigated by activity evaluation and catalyst characterization using XRD, H2-TPR, TEM. The results showed that with the increase in calcination temperature the reduction of t