GB1285474A - Zeolite catalyst and process for converting hydrocarbons - Google Patents

Abstract

1285474 Dysprosium-containing aluminosilicate zeolite catalysts SUN OIL CO 1 Aug 1969 [2 Aug 1968] 38694/69 Heading B1E [Also in Divisions Cl and C5] A hydrocarbon conversion catalyst comprises (a) aluminosilicate zeolite containing cations selected from Dy<SP>3+</SP>, Dy(OH)<SP>2+</SP> and Dy(OH) 2 <SP>+</SP> and, optionally, (b) a hydrogenation component selected from molybdenum, rhenium, cobalt, nickel, ruthenium, rhodium, palladium and platinum and oxides and sulphides thereof, for example molybdenum oxide, molybdenum sulphide, cobalt oxide, nickel oxide, nickel sulphide and palladium oxide. The zeolite also may contain cations selected from silver, magnesium, zinc, aluminium, nickel, lanthanum, cerium and gadolinium and oxides and hydroxides thereof; reference is made to a zeolite containing cationic cerium, gadolinium and dysprosium. The catalyst may contain from 0.05 to 25 weight per cent of the hydrogenation component, for example from 1 to 10 weight per cent of nickel or from 0.1 to 2 weight per cent of rhenium, palladium or platinum or mixture thereof. The hydrogenation component may be supported on carrier material selected from microporous silica, alpha-alumina, silica-alumina and acid-exchanged clays, for example montmorillonites and kaolin. The hydrogenation component may have been incorporated into the zeolite by impregnation or ion-exchange; alternatively and especially when the hydrogenation component is supported, the zeolite and the hydrogenation component may be in physical admixture. Examples relate to the preparation of DyH Y- type zeolite by exchanging Na Y-type zeolite successively with NH 4 Cl in aqueous solution and Dy(NO 3 ) 3 . 5H 2 O in aqueous solution, washing the exchanged zeolite in water, drying the washed exchanged zeolite at 120‹C and heating the dried exchanged zeolite at 400‹C in helium (Example 1) and to the preparation of DyH Y-type zeolite containing 0.5 weight per cent Pt by contacting an aqueous suspension of the dried exchanged zeolite as prepared supra with an aqueous solution of Pt(NH 3 ) 2 Cl 2 , recovering a composite comprising zeolite and platinum by filtration and subjecting the composite successively to washing with water, drying at 120‹C, heating at 400‹C in air and reduction at 400‹C in hydrogen (Example 2). Hydrocarbon conversion in the presence of such catalyst may be effected in the presence of a halogen-containing adjuvant, for example selected from hydrogen fluoride, hydrogen chloride, boron trifluoride, aluminium bromide carbon tetrachloride and chlorinated hydrocarbons containing from 1 to 6 carbon atoms, for example methyl chloride and tertiary-butyl chloride; reference is made in Example 3 to the use of carbon tetrachloride and tertiarybutyl chloride in combination. The catalyst may be regenerated by purging with ammonia or burning in air; water may be incorporated in regenerated catalyst by exposure thereof to steam in air or nitrogen. When the catalyst comprises a hydrogenation component, regenerated catalyst may be contacted at 250-800‹F with hydrogen in order to reduce the hydrogenation component.