Hydrocarbon cracking catalyst containing phosphorus and its prepn

Abstract

The hydrocarbon cracking catalyst contains molecular sieve, binder and clay and its features are the mixed sol of chlorine-containing aluminum sol and phosphorus-containing aluminium sol used as binder. The binder raises the antiwear strength of the catalyst, and decreases the chlorine content in the spray drying slurry and the catalyst. The hydrocarbon cracking catalyst results in lower gas and coke yield and higher diesel oil yield and diesel oil / gasoline ratio.

Description

technical field [0001] The invention relates to a petroleum hydrocarbon cracking catalyst and a preparation method thereof, in particular to a molecular sieve-containing hydrocarbon cracking catalyst using aluminum sol and phosphorus-containing aluminum sol mixed sol as a binder and a preparation method thereof. Background technique [0002] Phosphorus-containing hydrocarbon cracking catalysts mainly include the following three types: one is that the molecular sieve component of the catalyst is a phosphorus-containing zeolite molecular sieve, as described in U.S.P.5,312,792, U.S.P.5,472,594, EP 667185, etc.; Aluminum or alumina-aluminum phosphate is used as a substrate or a part of the substrate. This type of catalyst substrate has good thermal stability, good activity and selectivity, and is suitable for heavy oil cracking, such as U.S.P. , described in EP 488427, EP 4962267, etc.; the other is to use phosphoric acid, phosphorous acid and its ammonium salts to treat molecul...

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Problems solved by technology

[0005] Report in CN86104860A, add phosphoric acid solution in the pseudo-boehmite of aging, then mix with zeolite and clay, spray dry, roast, the catalyst wear rate that obtains declines to some extent

However, there are also many shortcomings in using this phosphorus-containing aluminum sol as a binder.

One is that the preparation process of this binder requires steps such as high-temperature depolymerization and concentration, and the preparation method is relatively complicated; the other is that in order to ensure the stability and fluidity of the phosphorus-containing aluminum sol, the phosphorus content in the sol is limited. The P / Al (weight) ratio is lower than 0.25; the third is that compared with the aluminum sol, the chlorine content of this phosphorus-containing aluminum sol is reduced very little, and mainly relies on the use of chlorine-containing aluminum with a high Al / Cl (weight) ratio. Sol raw materials to improve its Al / Cl (weight) ratio, which is difficult to achieve industrially

As far as the inventors know, there is no report on the preparation of hydrocarbon cracking catalysts by using chlorine-free phosphorus-containing aluminum sol binders