Huiji Zhao

Synthesis, characterization, and application of hydotalcites in hydrodesulfurization of FCC gasoline

Magnesium–aluminum, copper–aluminum, zinc–aluminum hydrotalcite(HT) compounds were synthesized using co-precipitation method. The effects of stirring rate, feeding rate of reactants, pH, calcination temperature on the properties of Mg–Al mixed oxides were investigated by using XRD, TG-DTA and BET techniques. The catalytic activity and selectivity of CoMo/γ-Al2O3, CoMo/γ-Al2O3+HT catalysts for hydrodesulfurization of FCC gasoline were examined in a high pressure microreactor. The results showed that the catalysts with mixed oxide obtained from hydrotalcite as support give lower levels of olefin hydrogenation than the catalyst with γ-Al2O3 as support, and lower octane number reduction and hydrodesulfurization yield, too. The hydrodesulfurization activity order was as follows: CoMo/γ-Al2O3>CoMo/γ-Al2O3+Mg–Al(HT)>CoMo/γ-Al2O3+Cu–Al(HT)>CoMo/γ-Al2O3+Zn–Al(HT), and the olefin hydrogenation activity and octane number reduction order were as follows: CoMo/γ-Al2O3+Zn–Al(HT)

Effects of Modified Co-Mo Catalysts for FCC Gasoline HDS on Catalytic Activity

Abstract In this paper, a series of catalysts with HZSM-5/γ-Al2O3, HZSM-5/ TiO2-γ-Al2O3 as supports, bearing Co-Mo as active components, were prepared, and the catalysts were modified with alkaline earth and VIII, IB metal oxide. The catalysts were evaluated by hydrodesulfurization for QILU FCC gasoline. The experiment results showed that: (1) the RON (research octane number) of effluents rose with the increase of ZSM-5 mass percent in the support, but the HDS ration reduced; (2) the catalysts with ZSM-5/TiO2-Al2O3 as support had higher HDS ratio but lower RON of effluent; (3) the catalysts modified with metal oxide had higher RON of effluent, but lower HDS ratio. Compared with the stuff, and as to RON of effluent and hydrodesulfurization ratio for the modified catalysts, it had the following order: Ba-modified > Fe-modified > Cu-modified.