Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (9): 2171.doi: 10.7503/cjcu20130285

• Physical Chemistry • Previous Articles     Next Articles

Catalytic Performance of the Ni/ZrO2 Catalysts Prepared with the Hydrogel Method in Methanation of CO2

LIU Quan, REN Jun, QIN Zhi-Feng, MIAO Mao-Qian, LI Zhong   

  1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2013-03-27 Online:2013-09-10 Published:2013-08-30

Abstract:

A series of Ni/ZrO2 catalysts was prepared by the hydrogel method and characterized by X-ray diffraction(XRD), Brunauer-Emmett-Tetter(BET), transmission electron microscopy(TEM) and H2 temperature programmed reduction(H2-TPR), and their catalytic activities for the methanation of carbon dioxide were investigated. The results show that ZrO2 presents an amorphous structure in the Ni/ZrO2 catalysts after calcination at 450℃. During the H2 reduction at the temperature of 400 ℃, the amorphous ZrO2 carrier was partly transformed into tetragonal phase and Ni species were re-dispersed on the surface of ZrO2. The metal-support interaction restrains the growth of NiO and ZrO2, and electron cavity on amorphous ZrO2 carrier favors the dispersion of Ni species. The NiO species interacted with amorphous ZrO2 and tetragonal ZrO2 has a definitive effect on the catalytic performance of the Ni/ZrO2 catalysts. The highest catalytic activity was obtained on the Ni/ZrO2 catalyst with a Ni/Zr molar ration of 0.707. Under the reaction condition, V(CO2)/V(H2)=1/4, gaseous hourly space velocity(GHSV)=1×104 h-1, P=0.5 MPa, 27% CO2 conversion was obtained at a low temperature of 200 ℃. The conversion of CO2 reached above 99% with the selectivity of CH4 above 92% when the reaction temperature was improved to 280—320 ℃.

Key words: Ni/ZrO2 catalyst, CO2, Methanation, Hydrogel method

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