A silicone modified aluminum hydroxide solid elastomer and preparation method thereof

Abstract

The invention relates to a method for preparing aluminum hydroxide wafer which is modified by silicon. Wherein, said wafer is baked and converted into silicon-modified gamma-Al203, to obtain following properties, that specific surface area is 400-600m2 / g, the hole capacity is 1.0-2.0cm3 / g, and the silica mass percentage is 2%-20%. In its preparation, after the neutralization between acid aluminum salt solution and alkali compound solution, it adds organic silicon to age, and composite via general steps. The invention has simple method.

Description

technical field [0001] The invention relates to a silicon-modified aluminum hydroxide and a preparation method thereof. In particular, the pore volume and specific surface area of ​​aluminum oxide are greatly improved after the introduction of a specific silicon-containing additive. technical background [0002] In the field of catalysis, how to prepare high-efficiency catalysts with high activity, excellent selectivity and long life has always been a subject of concern and attention. For catalysts that support active components on a carrier, although the carrier itself usually does not have direct catalytic activity, the catalytic components can only exert their catalytic performance stably by relying on a carrier with suitable performance. Using a carrier with a high specific surface area can prepare a highly dispersed supported catalyst, thereby improving the reaction performance of the catalyst; having a larger pore volume in the catalyst will improve its anti-coking or ...

AI Technical Summary

Problems solved by technology

The chemical method is usually to add additives in the process of alumina preparation. For example, patent 94107295.9 adds sodium silicate modified alumina after gelling; patent CN1030395C proposes to mix silica sol into pseudo-boehmite, which can play a role in hole expansion. effect, but the hole expansion effect is limited and there is a problem of uneven distribution of silicon

[0004] The modification of alumina by physical methods can only simply play the role of pore expansion, and cannot increase or even lose a certain specific surface area; while the current chemical method is generally to modify alumina with inorganic compounds, such as modification with silicon-containing compounds, It also cannot play the role of expanding pores and increasing specific surface area at the same time.