Silicon-phosphorus contained aluminum hydrate and its preparation

Abstract

An aluminium hydroxide particle containing Si and P dispersed on its surface is disclosed, which can be used for hydrorefining the fractional oil or preparing the hydrocatalyst. It is prepared by introducing the cheap Si-contained compound and P-contained compound in the process for preparing the alpha-AlO(OH) type aluminium hydroxide by Co2 method step by step. Its advantages are excellent physical and chemical properties, large pore volume and specific surface area, proper, surface acidity and better peptization.

Description

technical field [0001] The invention relates to a silicon-phosphorus-containing aluminum hydroxide and a preparation method thereof, in particular to a silicon-phosphorus-containing aluminum hydroxide with highly dispersed silicon and phosphorus additives on the surface of alumina and a large pore volume and a preparation method thereof. Background technique [0002] As we all know, in the preparation process of catalysts used in petroleum refining, alumina or γ-Al containing a small amount of one or more other elements such as Si, P, Ti, B, Mg, F, etc. are usually used 2 o 3 as the carrier. The performance of this type of hydrogenation catalyst depends largely on the performance of its alumina support, because the surface properties of the support directly affect the number and strength of active centers of the catalyst. Therefore, researchers and developers of this type of hydrogenation catalysts pay great attention to the development of catalyst support materials. Duri...

AI Technical Summary

Problems solved by technology

[0003] ZL94103999.4 discloses a method for preparing macroporous alumina containing silicon and phosphorus. In the preparation process of this alumina, silicon and phosphorus are added by step-by-step colloidal method, which can make silicon and phosphorus large Partially dispersed on the surface of alumina, but this alumina has large pores and poor peptization. In the preparation process of catalyst or carrier, only a part of the alumina containing silicon and phosphorus is mixed, and the rest is alumina with better peptization. Only in this way can it be smoothly formed; at the same time, it contains low silicon dioxide, only 1wt% to 4wt%, and contains more phosphorus, which will make the surface of the carrier weaker in acidity, and can be used for the preparation of hydrorefining catalysts, but not Suitable for the preparation of heavy oil hydroconversion catalysts or other catalysts that require conversion performance; the gelling process uses AlCl 3 、Al 2 (SO 4 ) 3 and Al(NO 3 ) 3 As a raw material, use ammonia water to neutralize gelation at a higher temperature, which will make its cost higher and a large amount of pollutants will be discharged