Abstract
Catalytic performance of ceria–silica and ceria–zirconia mixed oxides for dehydration of 4-methylpentan-2-ol has been investigated. The reaction was carried out in the temperature region 523–673 K in a fixed-bed microreactor at normal atmospheric pressure. The investigated mixed oxides were prepared by a rapid microwave-assisted combustion synthesis method by using metal nitrates as precursors. X-ray diffraction (XRD), Raman spectroscopy (RS) and temperature programmed desorption (TPD) techniques were used to investigate the structural and surface properties of the mixed oxides. XRD studies revealed the formation of a specific Ce 0.5Zr 0.5O 2 solid solution in case of ceria–zirconia sample, and the ceria–silica mixed oxide is found to be in amorphous form. RS measurements suggest the presence of oxygen vacancies and lattice defects in the ceria–zirconia mixed oxide sample. TPD of ammonia and CO 2 results reveal that ceria–silica exhibits strong acid–base properties compared to ceria–zirconia mixed oxide. Good alcohol conversion and excellent 4-methylpent-1-ene selectivity were observed on both the mixed oxides.
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