Methods of preparing cracking catalyst with alumina binder and phosphoric acid
AssigneeSaudi Arabian Oil Company
InventorsHashim N. Al Khunaizi, Munir Khokhar
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Abstract
A method for preparing a cracking catalyst includes combining a zeolite, an alumina binder, and phosphoric acid to form an extrusion mixture. The phosphoric acid acts as a peptizing agent. The extrusion mixture comprises from 0.000271 weight percent to 0.1 weight percent phosphoric acid based on the total weight of the extrusion mixture. The method further includes extruding the extrusion mixture to produce an extrudate. During the extruding, the phosphoric acid peptizes the alumina binder in the extrudate. The method further includes drying and calcining the extrudate to produce the cracking catalyst.
Claims19
A method for preparing a cracking catalyst, the method comprising:
- combining a zeolite, an alumina binder, and phosphoric acid to form an extrusion mixture, where:
- the phosphoric acid acts as a peptizing agent;
- and
- the extrusion mixture comprises from 0.000271 weight percent to 0.1 weight percent phosphoric acid based on the total weight of the extrusion mixture;
- extruding the extrusion mixture to produce an extrudate, where during the extruding, the phosphoric acid peptizes the alumina binder in the extrudate;
- and
- drying and calcining the extrudate to produce the cracking catalyst.
A process for cracking butenes, the process comprising contacting a feed comprising the butenes with a cracking catalyst under reaction conditions, where
- contacting the feed comprising butenes with the cracking catalyst causes at least a portion of the butenes in the feed to undergo catalytic cracking to produce a cracking effluent comprising at least propylene;
- and
- the cracking catalyst comprises:
- a ZSM-5 zeolite having a molar ratio of silica to alumina of from 500 to 2000;
- an alumina binder;
- and
- phosphoric acid, where:
- a zeolite to alumina binder ratio of from 3:1 to 2:1 by weight;
- a percent crystallinity of from 95% to 100%;
- a Bruauer-Emmett-Teller (BET) surface area of from 300 square meters per gram (m2/g) to 400 m2/g;
- and
- from 0.000271 weight percent to 0.1 weight percent phosphorous based on the total weight of the cracking catalyst.
Dependencies are inferred from the claim text.