Method for modification of zeolite molecular sieve outer surface acidity

• Main Author: XIANGSHENG,WANG WANG
• Format: Patent
• Language: English
• Published: 14.03.2007
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention relates to a method for using chemical reaction deposit to decorate the outer surface acid of ZSM-5 zeolite. Wherein, said method is characterized in that the silicone grease and the molecule screen are reacted in sealed container at 140-170Deg.C to be cooled and baked; and it uses cyclohexane solution of ethyl orthosilicate at 1-2.0mol/l; therefore, the silicon atom of ethyl orthosilicate can be completely carried by the molecule screen; and then left slag will not contain silicone grease. The invention has high carry efficiency of silicone grease, that only carrying the micrometer ZSM-5 one time while the opposite selectivity of catalyst can reach 90%, and carrying nanometer ZSM-5 two times while the opposite selectivity of catalyst can reach 90%.