化学
催化作用
无机化学
镍
甲烷
碳纤维
焦炭
硝酸钾
氧化镍
碳酸钾
钾
有机化学
复合数
材料科学
复合材料
作者
T. Haga,Yoshiyuki Nishiyama
标识
DOI:10.1016/0021-9517(83)90161-6
摘要
A pitch coke was impregnated with nickel nitrate and some additives and gasified in an atmospheric hydrogen flow, to investigate the possibility of promoting nickel-catalyzed hydrogasification by the addition of foreign components. Alkaline earths and aluminum nitrate, which were not direct catalysts for the hydrogasification of carbon, enhanced methane formation markedly, while nitrates of potassium, chromium, and iron and also potassium carbonate had almost no effect. Additives which are effective are believed to be in the form of an oxide. In the presence of nickel, methane is formed at two separate regions: 400–700 °C and above 750 °C. All the promoters increased conversion in the lower temperature reaction while only calcium salt enhanced it in the higher temperature reaction. Promoters, especially magnesium, extensively suppressed the sintering of nickel. The enhancement of methane formation at lower temperatures is ascribed to the increased dispersion of nickel. Possible reasons for the promotions are discussed.
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