ニッケル触媒の活性に及ぼす担体炭素の前処理の効果
1989 年 1989 巻 140 号 p. 314-316
詳細
1989 年 1989 巻 140 号 p. 314-316
An activated carbon was heated in hydrogen at 900°C for 4h and theni mpregnated with nickel nitrate from an aqueous solution to prepare carbon -supported nickel catalyst. The activity of the catalyst was compared with a catalyst supported on untreated activated carbon for hydrogenation of benzene at 85-120°C and hydrogenolysis of ethane at 280-350°C. The activity of nickel was greatly increased by the pretreatment of the support: 3 times in the hydrogenation of benzene to cyclohexane and about 30 times in the ethane hydrogenolysis to form methane. The dispersion of nickel on the supports was measured using temperature programmed desorption of hydrogen as well as X-ray diffraction technique. The large increase in the activity is attributed to the increased dispersion of nickel on the pretreated carbon surface, possibly due to the elimination of hetero-atoms.
