Small crystal ZSM-5, as a catalyst

Patent · Tue Aug 31 04:00:00 EDT 1993

OSTI ID:5983858

Klocke, D J

In a catalyst comprising ZSM-5 which can produce m-xylene and p-xylene and o-xylene, at thermodynamic equilibrium, the improvement is described comprising producing a crystal of ZSM-5 for said catalyst which substantially eliminates its selectivity for o-xylene production, wherein said crystal of ZSM-5 has a sorption capacity for mesitylene of at least about 3 weight percent which is formed by a process which comprises: (a) providing a crystallization reaction mixture which includes a source of silica, and a source of alumina; wherein the mole ratios or components in said reaction mixture are in the approximate ranges of: SiO[sub 2]/Al[sub 2]O[sub 3] 25 to 50, H[sub 2]O/SiO[sub 2] less than 5, OH[sup [minus]]/SiO[sub 2] greater than 0.11; (b) maintaining the crystallization temperature at less than about 250 C; (c) maintaining agitation conditions during crystallization effective to result in said crystal; (d) maintaining a mole ratio of OH[sup [minus]]/SiO[sub 2] in the reaction mixture of at least about 0.11; and (e) recovering said crystal.

• Assignee: Mobil Oil Corp., Fairfax, VA (United States)
• Patent Number(s): US 5240892; A
• Application Number: PPN: US 7-823408
• OSTI ID: 5983858
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
CONCENTRATION RATIO
CRYSTALLIZATION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXYL RADICALS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERS
MATERIALS
MESITYLENE
MINERALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADICALS
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS
WATER
XYLENES
ZEOLITES