Effect of Surface Concentration of Nickel on the Activity and Selectivity of Ni/ZnO-Al2O3 Sorbents in Reactive-Adsorption Desulfurization of Olefin-Containing Feedstock

摘要

The advantages of the reactive adsorption process for ultra-deep desulfurization of gasoline from catalytic cracking and other hydrocarbon fractions are demonstrated. In order to investigate the effect of the surface concentration of nickel on the activity and selectivity of the reactive adsorption process a series of Ni/ZnO-Al2O3 adsorption-catalytic systems with various nickel contents were synthesized. It was established that at the chemisorption stage at 400 degrees C, with pressure of 0.5 MPa and feedstock weight hourly space velocity of 5.2 h(-1) the conversion of thiophene is increased to 94.8 with increase of the surface concentration of nickel to 8 at/nm(2). However, the highest value for the hydrodesulfurization/hydrogenation selectivity factor is obtained for the Ni/ZnO-Al2O3 adsorption-catalytic system with a nickel surface concentration of 6 at/nm(2).