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《CHINESE JOURNAL OF CATALYSIS》 1998-04
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REACTION MECHANISM OF METHANE PARTIAL OXIDATION TO SYNGAS OVER THE Ni/Al_2O_3 CATALYST

Shen Shikong, Li Chunyi, Yu Changchun (Laboratory of Catalytic Conversion of Natural Gas, University of Petroleum (Beijing), Beijing 102200)  
Transient response technique equipped with on line quadruple mass spectrometer has been used to study the reaction mechanism of methane partial oxidation to syngas over an 8%(mol)Ni/Al 2O 3 catalyst at atmospheric pressure and 973 K. It is found that the metallic Ni sites play an important role in dissociation of methane and oxygen to form carbide (Ni x C) and NiO. CO is formed via carbide to react with surface NiO. H 2 and CO are the primary products of methane partial oxidation. In combination with pulse reaction experiments, it could be derived that methane partial oxidation to syngas accords with the direct oxidation mechanism, which can be described as follows:1. CH 4+ x NiNi x C+2H 2; 2. O 2+2Ni2NiO; 3. Ni x C+NiOCO+( x +1)Ni.
【Fund】: 国家自然科学基金
【CateGory Index】: O643.32
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