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- W2042165736 abstract "The effect of potassium promoter for CO hydrogenation on supported nickel catalysts was studied in a differential reactor. The influences of the support (SiO2, SiO2 · A12O3), the promoter concentration (0.05–4% K), the alkali salt (KC1, K2CO3, K2C2O4, KOH, KNO3), and the method of preparation (pre- and coimpregnation, and calcination) were studied. The activity and selectivity of promoted catalysts are shown to depend on the support; modifications in catalytic properties are not just due to a KNi interaction. On NiSiO2 an exponential decrease in total activity with increased promoter concentration is seen; this decrease is not due to a decrease in percentage nickel exposed (dispersion). A large increase in olefin/paraffin ratios is seen on NiSiO2 as the promoter decreases hydrogenation rates. In contrast, on NiSiO2 · A12O3, the rate of paraffin formation, including methane, increases and exhibits a maximum with increased promoter concentration. Olefin selectivities decrease and higher paraffin selectivities increase. Much of the potassium salt may react with the silica-alumina support to modify the catalytic properties. The method of preparation has a lesser influence on the catalyst than the potassium concentration. The use of different potassium salts resulted in similar catalytic properties, indicating that for a given support the same potassium compound formed during preparation. A good correlation was found between C2 and C3 olefin/paraffin ratios and inverse total activity, showing that olefin selectivities increase as hydrogenation rates decrease." @default.
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- W2042165736 date "1985-05-01" @default.
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- W2042165736 title "Alkali promoters on supported nickel: Effect of support, preparation, and alkali concentration" @default.
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- W2042165736 doi "https://doi.org/10.1016/0021-9517(85)90158-7" @default.
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