Hydrogenation of carbon dioxide to C1-C7 hydrocarbons via methanol on composite catalysts

✍ Scribed by Tomoyuki Inui; Kazuichi Kitagawa; Tatsuya Takeguchi; Takashi Hagiwara; Yoshinori Makino

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 595 KB
• Volume: 94
• Category: Article
• ISSN: 0926-860X
• DOI: 10.1016/0926-860x(93)80043-p

✦ Synopsis

Hydrocarbon synthesis from C02 and H2, via methanol, was studied. Composite catalysts consisting of a low-temperature methanol synthesis catalyst and typical H-ZSM-5 were adopted. Syngas conversion was studied for comparison. Mixing H-ZSM-5 with the methanol synthesis catalyst promoted methanol conversion to hydrocarbons. It markedly affected the rate of syngas conversion, since the equilibrium between syngas and methanol was shifted. However, the rate of CO2 hydrogenation was not affected. For this reason, it was considered that methanol was formed via CO as the intermediate in C02 hydrogenation on the composite catalyst, and consequently the selectivity to methanol was considerably low. There%re. the effect of H-ZSM-5 was reduced. Nevertheless, hydrocarbons containing 71.8% C~-C7 in addition to 28.2% methane could be obtained on a catalyst of mixed Pd-Na-modified Cu Cr-Zn oxides and the H-ZSM-5.