Preparation And Performance Of The Ni_1-xFe_x/Al₂O₃ Catalyst For CO Methanation

CO methanation is one of the key reactions of clean-use of coal. Our work did a research of the reaction of using CO and hydrogen to produce methane. First, we did thermodynamic analysis of the reaction system, and propose the design of catalyst. Secondly, we prepared the catalysts with the precipitation method, and then , the catalysts were evaluated on a fix-bed continuous flow reactor. The crystal phase and surface functions were characterized bu the techniques such as XRD,TEM,XPS and TPR. Finally, we tested the durability of the catalyst. What conclusions we get from the work are that:(1) We use fix-bed continuous flow reactor to test the catalysts activity for CO methanation, and the reactions last for 8 hours, the results indicated that, when the component of the catalyst is Ni(0.9)Fe(0.1), the catalyst performed better than the others, selection of methane can reach up to 83%, CO and hydrogen conversions can reach to 100% and 85% repectively. The addition of Fe can affect the disperation of NiO on the surface of the catalysts.(2) According to the results of the test of durability of the catalyst Ni(0.9)Fe(0.1), we found that, CO converstion can still remained at 99% after 11-hour reaction, and then drop to 61% remaining stable. Similarly, hydrogen conversation reach to 85% after 5-hour reaction and then drop to 57%. Selection of methane is 88% at the time of 10 hours after reaction, and finally keep at 14%. CO2 selection went up and down in the range of 4% to 6%.(3) Results of XPS analysis of Ni(0.9)Fe(0.1),Ni(1.0) and Fe(1.0) indicated that, addition of Fe can make the production of acid and ester more easier.