Abstract
The CO2 Methanol reforming reaction, over Keggin type heteropoly compounds catalysts was investigated. The catalysts prepared, H3PMo12O40 and its salts Cu(1.5)PM0(12)O(40) and Zn1.5PMo12O40 were characterized by means of IR, XRD and TG. Catalytic tests were carried out under atmospheric pressure at 573 K in a continuous flow system using a glass reactor. The results obtained showed that the unsupported H3PMo12O40 is more active than its copper and zinc salts. As for the alumina-supported H3PMo12O40, it has been observed that, besides methyl formate (MF), formaldehyde (HCHO) and dimethyl ether (DME), the dimethyl carbonate (DMC) was obtained. The formation of the latter, observed only on the supported catalysts, seems to indicate that its formation requires both, Lewis-acid and redox sites. Bronsted-sites reduce its formation in favour of dimethyl ether (DME) and strong redox sites in. favour to formaldehyde (HCHO).