Abstract
The synthesis of hydrocarbons from carbon dioxide and hydrogen was studied under pressurized conditions using hybrid catalysts composed of methanol synthesis catalysts and a high-silica zeolite (DAY). Combination of Cu-Zn with DAY gave C 2-C 5 hydrocarbons with selectivities higher than 90%. Addition of a small amount of CO in the H 2-CO 2 feed led to a marked increase in yield and selectivity of the C 2-C 5 hydrocarbons irrespective of reaction conditions such as temperature, contact time and the H 2/(CO 2+CO) feed ratio. It was suggested that the major route of hydrocarbon formation was (1) reduction of CO 2 to CO on the methanol synthesis catalyst, (2) methanol formation from CO and H 2, and (3) methanol conversion to hydrocarbons on the DAY.
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