HYDRODESULFURIZATION AND HYDRODEMETALATION REACTIONS OF RESIDUE OILS OVER COMO ALUMINUM BORATE CATALYSTS IN A TRICKLE BED REACTOR

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Title:	HYDRODESULFURIZATION AND HYDRODEMETALATION REACTIONS OF RESIDUE OILS OVER COMO ALUMINUM BORATE CATALYSTS IN A TRICKLE BED REACTOR
Authors:	TSAI,MC;CHEN,YW;KANG,BC;WU,JC;LEU,LJ
Contributors:	化學工程與材料工程學系
Keywords:	TEMPERATURE-PROGRAMMED REDUCTION;SUPPORTED MOLYBDENUM OXIDE;TUNGSTEN-OXIDE;SULFIDED STATE;REDUCIBILITY;CARBON;SILICA
Date:	1991
Issue Date:	2010-06-29 17:35:51 (UTC+8)
Publisher:	中央大學
Abstract:	A series of aluminum borates (AB) with various Al/B mole ratios was prepared by the precipitation method. These samples have been characterized with respect to surface areas, pore volumes, pore size distributions, thermal stabilities, and mechanical strength. The results indicated that the exhibited properties are dependent on the Al/B ratio of the material. The monodisperse pore size distributions of these samples imply that it is a true microcomposite structure rather than a mixture of the individual materials. Hydrodesulfurization (HDS) and hydrodemetalation (HDM) of heavy Kuwait atmospheric residum over CoMo/AB catalysts were carried out in a bench-scale trickle bed reactor at 663 K and 7582 kPa. The weight hourly space velocity of residue oils was 1.5, and the hydrogen flow rate was kept constant at 300 mL/min(STP). The results showed that these catalysts are much more active than the conventional CoMo/Al2O3 catalyst in HDS and HDM reactions. The results of desulfurization acivity are mainly interpreted on the basis of difference in dispersion and the interaction of Mo species with the support. The demetalation activity was strongly influenced by the intraparticle diffusion of metal porphyrins. A general correlation could be established between the HDS activity and the reducibility of oxidic precursor. Larger surface area and high reducibility of active metal may produce more active sites and result in high HDS activity. In addition, larger pore size can reduce the pore diffusion resistance and may produce more opportunity for HDM reaction.
Relation:	INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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