Preparation method of macroporous alumina support

Abstract

The invention discloses a preparation method of a macroporous alumina support. The method is characterized by taking sawdust produced in the wood processing industry as a pore-enlarging agent, enabling the sawdust to adsorb an inorganic aluminium salt solution after carbonizing treatment, and kneading, forming, drying and roasting the sawdust and an alumina precursor after drying the sawdust, thus obtaining the macroporous alumina support. The alumina support obtained by the method is larger in specific surface area, more concentrated in pore size distribution and high in mechanical strength, also contains part of macropores with sizes more than 100nm, is suitable for preparing heavy / residual oil hydrogenation catalysts, and is favorable for removing macromolecular impurities in heavy / residual oil and delaying the increase of diffusion resistance in heavy / residual oil hydrogenation, thus being favorable for maintaining the activities of the hydrogenation catalysts and lengthening the running period.

Description

technical field

[0001] The invention relates to a method for preparing a macroporous alumina carrier, in particular to a method for preparing a macroporous alumina carrier used as a catalyst for hydrogenation demetallization of heavy oil and residual oil. Background technique

[0002] As crude oil becomes increasingly heavy and inferior, oil refineries are faced with a large number of problems in the processing and utilization of heavy and residual oil. There are a large amount of organometallic compounds such as nickel, vanadium and iron and asphaltenes in heavy and residual oils. The above metals and asphaltenes will cause the blockage of the pores of the catalyst bed and reduce the life of the catalyst. Extensive metal deposits on the catalyst tend to poison or deactivate the catalyst. In addition, asphaltenes tend to reduce the sensitivity of hydrocarbon desulfurization, and for hydrodesulfurization catalysts, if acted on hydrocarbon feeds containing metals and asphalte...