VAPOR PHASE CARBONYLATION OF ETHANOL WITH Ni-Zn/C CATALYST

摘要

Vapor phase carbonylation of ethanol with Ni/C and Ni-Zn/C catalyst was investigated under atmospheric pressure. Ni-Zn/C was found to have a significantly higher activity and selectivity than Ni/C. Effects of Zn and Ni loading on ethanol conversion and product distributions were also investigated, and the sequence of metal loading was compared. The cata- lyst was characterized by XRD (X-ray diffraction) and SEM-EDS. The spectra of XRD demonstrated that the catalyst structure was changed from crystalline to non-crystalline in the process of carbonylation. Stable iodide compound was formed due to the interaction between C_2H_5I and active metals. The authors believe that the active phase of carbonylation might have been non-crystalline.