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Volume :29 Issue : 2 2002      Add To Cart                                                                    Download

Ca Promotion of Pd for CO Hydrogenation towards Methanol; Impacts of Ca Precursor and Method of Preparation

Auther : SAMI H. ALI

Department of Chemical Engineering, Kuwait University, P.O.Box 5969, 13060 Safat - Kuwait, Email: samiali@kuc01 .kuniv.edu.kw, Fax: (965) 4839498

ABSTRACT

The impacts of type of promoter precursor and method of preparation on the activity of 2 wt% of Pd catalysts supported on SiO2 were investigated using CO hydrogenation reaction under conditions by which the formation of methanol was kinetically controlled. The anion contained in the Ca precursors used (Cl- or NO3-) affected both the activity and the selectivity of CO hydrogenation reaction of Ca promoted Pd catalysts. Methanol selectivity was higher in the case of using a CaCl2 precursor than using a Ca(NO3)2 to prepare the sequentially impregnated Ca over Pd/SiO2 catalysts. The optimum Ca to Pd ratio was affected by the type of promoter precursor used. On the other hand, the sequence of impregnation of CaCl2 over SiO2 had influenced the activity for CO hydrogenation to methanol. The development of a Ca-Pd contact area was suggested to be the reason behind the observed increase in the rate of methanol synthesis in the case of the sequentially impregnated Ca over Pd/ SiO2. The dispersion of the Pd particles in the case of the co-impregnated Ca and Pd over SiO2 was apparently higher than that for the unpromoted Pd catalyst, which resulted in the increase in the rate of methanol synthesis. The sequential impregnation of Pd over Ca/SiO2 resulted in a slight increase in the activity for CO hydrogenation to methanol probably due to some enhancement in the dispersion of Pd particles.

Key Words: CaCl2; Ca(NO3)2; Pd/ SiO2; CO hydrogenation; methanol

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