Alumina support containing silicon and titanium and preparation method thereof

Abstract

The invention discloses property-transformation alumina carrier which contains titanium and silica agent and its relative preparing method. Said silica agent is added in the sol process of aluminum hydroxide to improve the specific surface, pore diameter and pore capacity of alumina; after the sol process, individually using acid agent and alkali agent to adjust the pH value of mixed paste solution for several times to make the attained alumina with more centralized pore distribution; the titanium agent is added after the sol process and before the aging process, to improve the surface acid property, surface acid amount and B acid amount of carrier. In addition, the surface of alumina is modified by titanium to decrease the interactive condition between active metal and carrier, which can apply the diffusion of active metal components in the catalyst. The property transformation of said invention can be used as catalysis material when processing oil, especially as the catalyst carrier of hydrogenation treatment and hydrogenation transformation.

Description

technical field [0001] The invention relates to a modified alumina carrier and a preparation method thereof, more specifically, to an alumina carrier containing silicon and titanium additives and a preparation method thereof. Background technique [0002] Generally speaking, most catalysts used in petroleum processing are supported by alumina or alumina containing additives. The basic preparation process is to first prepare a carrier with suitable physical and chemical properties, and then load a suitable active group by a suitable method. point. In the catalyst preparation process, additives can be introduced into the system at different stages, commonly used additives are one or more of Zr, Si, P, Ti, B, Mg and F, etc. The main purpose of adding these additives is to adjust the acid properties of the catalyst, the pore structure and improve the interaction between the active components and the support. However, due to the complexity of the catalyst preparation process, t...

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Problems solved by technology

[0004] CN1110304A discloses a preparation method of macroporous silicon and phosphorus-containing alumina, in the preparation process of this alumina, silicon and phosphorus are added by step-by-step colloidal method, so that most of silicon and phosphorus can be dispersed in the oxide The aluminum surface increases the pore diameter and pore volume of alumina, but due to the addition of more phosphorus, the acid content on the alumina surface, especially the B acid content, is greatly reduced, and the acid strength is significantly reduced, which limits its application.

In addition, the distribution of B acid and L acid on the surface of the carrier is unreasonable, especially the ratio of B acid is low, which leads to the mismatch of the amount of acid in the two properties and reduces the reaction selectivity.