Cu/ZnO
catalysts have been widely studied for the hydrogenation
of carbon dioxide to methanol at atmospheric pressure. In the work
described here, several interesting issues are highlighted that have
rarely been considered previously. An extensive study of the influence
of the calcination and reduction temperatures and the metal loading
was carried out. The best conditions found for catalyst preparation
were calcination at 350 °C and reduction at 200 °C. The
role of the different oxidation states of copper (Cu2+,
Cu1+, and Cu0) was proven in the methane and
methanol formation. CuZn alloy formation was observed when a reduction
temperature of 400 °C was used. The use of this alloy led to
higher methanol selectivity at higher temperatures (>200 °C).
Finally, the metal loading study confirm the dual-site nature of the
methanol synthesis mechanism.
The aim of the work described here was to evaluate the catalytic performance of palladium catalysts supported on zinc oxide (Pd/ZnO) in the hydrogenation of CO2 to obtain methanol at atmospheric pressure. The influence of the reduction temperature, calcination conditions, metal loading and Pd precursor on the catalytic performance was studied.
Palladium/zinc catalysts supported on carbon nanofibers (CNFs) have been used to study the catalytic performance in the hydrogenation of CO 2 to obtain methanol at atmospheric pressure. The carbon nanofiber support has an influence on the nature of the PdZn alloy formed. The effect of the Pd/Zn molar ratio on the PdZn alloy particle size was analyzed. Lower Pd/Zn molar ratio leads to higher PdZn alloy particle size, which was associated with higher selectivity toward methanol. The influence of the type of nanofiber (platelet or fishbone) on the catalytic behavior was also studied and compared with that of a conventional Pd/ZnO catalyst. The palladium/zinc catalyst supported on platelet nanofiber was considered to be a good candidate for the hydrogenation of carbon dioxide to methanol.
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