Conversion of aliphatics to aromatics over a zeolite catalyst

Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By ring formation from nonring moiety – e.g. – aromatization,...

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208135, 585418, C07C 252

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active

048229415

ABSTRACT:
A process is provided for producing aromatic compounds which comprises contacting under conversion conditions a feed comprising aliphatic hydrocarbons, with a crystalline aluminosilicate zeolite catalyst in its acid form having a Constraint Index in the range of about 1 to 12 and prepared by crystallizing a composition comprising an aqueous suspension of a precipitated amorphous silica or aluminosilicate precursor composed of a preponderant number of particles having a particle size in the range of about 1 to 500 microns, said composition being free of any organic or inorganic directing agent and containing a dissolved alumina source if a precipitated amorphous silica is utilized or a precipitated amorphous aluminosilicate is utilized containing less than the desired amount of aluminum. The catalyst is advantageously subjected to a thermal or steam treatment, and/or is impregnated with gallium before being used in the conversion.

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