The selective hydrogenation of acetylene to ethylene over Pd‐Ag/α‐Al2O3 catalysts prepared by different impregnation/reduction methods was studied. The best catalytic performance was achieved with the sample prepared by sequential impregnation. A kinetic model based on first order in acetylene and 0.5th order in hydrogen for the main reaction and second‐order independent decay law for catalyst deactivation was used to fit the conversion time data and to obtain quantitative assessment of catalyst performances. Fair fits were observed from which the reaction and deactivation rate constants were evaluated. Coke deposition amounts showed a good correlation with catalyst deactivation rate constants, indicating that coke formation should be the main cause of catalyst deactivation.
Alkoxysilanes were used as novel enhancing agents in the Ti-based catalyst for the highly selective ethylene dimerization to butene-1. The dimerization of ethylene was carried out using the homogeneous Ti(OBu) 4 /THF/TEA/alkoxysilane catalyst system, where Ti(OBu) 4 , THF (tetrahydrofuran), TEA (triethylaluminum), and alkoxysilane were used as catalyst, additive, activator, and modifier, respectively. The nature and concentration of alkoxysilanes on the dimerization rate, catalyst yield, by-products production, and selectivity to butene-1 were investigated in detail. It was found that the performance of alkoxysilanes assisted with the class of the Ti-based catalyst system, developed in this work, has been furthered by high productivity and selectivity with respect to the bare catalyst system. It proved that alkoxysilanes could play an excellent improving role in the selective ethylene dimerization process. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44615.
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