A boron-containing aluminum hydroxide solid elastomer and preparation method thereof

Abstract

The invention discloses a boron-containing aluminum hydroxide solid elastomer and the preparation method thereof. In the method, a stable solution of boron-containing organic compounds is added to conventional aluminum hydroxide gel, and the mixture is aged, filtered, washed and dried to obtain boron-containing aluminum hydroxide solid elastomer. The boron-containing aluminum hydroxide solid elastomer of the invention is a carrier ingredient with excellent performance, can provide large pore volume and large specific surface area, possesses suitable pore structure and acid property, and is especially suitable for being used as the catalyst material required in catalysis and process of heavy hydrocarbon.

Description

technical field [0001] The invention relates to a boron-containing aluminum hydroxide dry glue and a preparation method thereof, in particular to a macroporous boron-containing aluminum hydroxide dry glue with a certain acidity and a preparation method thereof. Background technique [0002] Aluminum hydroxide dry gel is a precursor for the preparation of alumina. Alumina has the characteristics of good thermal stability, many micropores, good strength, and high water absorption. It is an ideal carrier component for preparing various supported catalysts, and is widely used in petroleum, chemical and other industries. In practical applications, catalytic promoter components, such as boron, are usually added to improve the pore structure, specific surface and acid properties of alumina, improve the dispersion of active metals and the interaction between active metals and supports, so as to improve the catalytic activity of the catalyst. Reaction performance, improve anti-cokin...

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Problems solved by technology

This method adopts the strong acidity of ammonium fluoroborate or boron trifluoride, which will seriously lose the strength and specific surface area of ​​the catalyst, and the activity of the catalyst will be greatly reduced, and the compound containing fluorine and boron is poisonous, which not only deteriorates the working environment, but also It is very easy to corrode the equipment and cause serious pollution to the environment

In addition, this method needs to be heated to 50-90°C when mixing, the operation process is complicated, and the production cost is increased.

However, if boric acid is used at room temperature, boric acid is easy to precipitate, resulting in poor dispersion of boron in alumina, and when the boron content exceeds 2%, most of it will be converted into inactive tetrahedral coordination B

Using boric acid as an auxiliary agent, although it can play a role in pore expansion, the pore volume and specific surface area of ​​the obtained alumina will not increase much, and if the operating conditions are not properly controlled, or the boron content is not properly controlled, it will also affect the aluminum hydroxide. Gelling, which in turn makes the strength of the alumina carrier and the prepared catalyst worse, and reduces the activity and service life of the catalyst

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