The high temperature calcination molecular sieve catalyst With increased selectivity to modify the activity and diffusion properties

摘要

1. A method of modifying the catalytically active molecular sieve which vklyuchaetsya) increasing the selectivity of said catalytically active molecular sieve by contacting with a silicon-containing agent to increase the selectivity, and b) calcining the catalytically active molecular sieve of increasing selectivity in the atmosphere substantially free of water vapor at high temperature calcination conditions, involving a temperature above 700 ° C, the conditions effective to reduce the acid activity, measured as the alpha value and increase diffusion barrier of said catalytically active molecular sieve measured as an absorption rate of 2,3-dimethylbutane, compared to undergo the procedure to increase the selectivity of the catalytically active molecular sitom.2. A method according to claim 1, wherein said diffusion barrier is increased by at least 25% .3. A method according to claim 2, wherein said diffusion barrier is increased by at least 35% .4. A method according to claim 3, wherein said diffusion barrier is increased by at least 50% .5. A method according to claim 1, wherein the catalytically active molecular sieve is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, ZSM-35, ZSM-48, ZSM-50, ZSM -57, ZSM-58, zeolite beta, MCM-22, MCM-36, MCM-49, MCM-56, mordenite, MCM-58, faujasite, synthetic, natural faujasite, MCM-41, ALPO-5, VPI-5, SAPO-5, SAPO-11, SAPO-30, SAPO-31, SAPO-34, ITQ-2, ITQ-3, ITQ-12 and ITQ-13.6. A method according to claim 5, wherein the catalytically active molecular sieve is a ZSM-5 with a binder of oxide kremniya.7. A method according to claim 1, wherein the catalytically active molecular sieve further comprises a metal selected from the group consisting of a metal of Group VIIIA, Group VIIA metal, Group VIA metal, Group VB metals, Group IVB metals, Group IIB metals, Group IIA metals, and a metal of Group IB of the Periodic tablitsy.8. A method according to claim 7, wherein said metal is a hydrogenation metal selected from the group consisting of platinum, palladium, iron, nickel, gallium, zinc, molybdenum, and reniy.9. The method of claim 1 wherein said agent to increase the selectivity is selected from the group consisting of polysiloxanes, siloxanes, silanes, disilanes and alkoksisilany.10. The method of claim 1, wherein the selectivity increase is carried out by two to six treatments increase selektivnosti.11 said agent. A method according to claim 1, wherein said calcining is conducted under conditions effective to provide the catalytically active molecular sieve having an alpha value less than 700 and a diffusion barrier, measured as the rate of 2,3-dimethylbutane uptake of less than 270 (D / (r2 × 106)). 12. A method according to claim 11, wherein said calcining is conducted under conditions effective to provide the catalytically active molecular sieve having an alpha value of from 25 to 200 and the diffusion barrier, measured as the rate of 2,3-dimethylbutane uptake of less than 150 (D / (r2 × 106)). 13. A method according to claim 11, wherein said calcining is conducted under conditions effective to provide the catalytically active molecular sieve having an alpha value of from 5 to 25.14. A method according to claim 1, wherein said calcining is conducted at temperatures ranging from 700 to 1200 ° C for 0.1-12 ch.15. A method of structurally-selective hydrocarbon conversion which comprises: contacting the hydrocarbon feedstock at hydrocarbon conversion conditions with a catalyst comprising the catalytically active molecular sieve prepared in accordance with any of pp.1-14.16. The method of claim 15, wherein said structure-selective hydrocarbon conversion is selected from the group consisting of catalytic cracking, aromatics disproportionation, aromatics isomerization, aromatic alkylation, catalytic dewaxing, and reforming nafty.17. The method of claim 15, wherein said structure-selective hydrocarbon conversion is disproportionation toluola.18. The method of claim 15, wherein said structure-selective hydrocarbon conversion is xylene isomerization.