US 4,542,248 AGranted

Process for the preparation of a C.sub.2 -C.sub.4 paraffin dehydrogenation catalyst

AssigneeShell Oil Company

InventorJacques P. Lucien

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Abstract

A process is described wherein C.sub.2 -C.sub.4 paraffins are dehydrogenated over a catalyst which has been prepared by (a) impregnating an Al.sub.2 O.sub.3 carrier with an aqueous solution of a Sn-compound; (b) calcining the impregnated carrier; (c) impregnating the composition with an aqueous solution of a Pt-compound; (d) reducing the composition; (e) removing at least part of any halogen introduced in step (a) and/or (c) by treating the composition with a non-acidic solution comprising NH.sub.4.sup.+ ions until the halogen content of the final catalyst amounts to less than 0.1% w; and (f) impregnating the composition with a non-acidic (halogen-free) aqueous solution of an alkali metal compound. The C.sub.2 -C.sub.4 -olefins formed are converted to aromatic gasoline over a catalyst containing a crystalline metal silicate having a ZSM-5 structure.

Claims11

Dependent claims

A process for dehydrogenating C.sub.2 -C.sub.4 paraffins, characterized in that it comprises contacting said paraffins under dehydrogenation conditions with a dehydrogenation catalyst prepared by using impregnation liquors in which the platinum and/or tin compound occurs in the form of a halogen-containing compound as follows:

(a) impregnating an alumina carrier with an aqueous solution of a tin compound;
(b) calcining the composition;
(c) impregnating the composition with an aqueous solution of a platinum compound;
(d) reducing the composition;
(e) removing at least part of the halogen ions, which were introduced into the composition by using a halogen-containing platinum compound and/or tin compound in steps (a) and/or (c), by treating the composition with a non-acidic aqueous solution comprising NH.sub.4.sup.+ ions to provide a final catalyst containing less than 0.1% w of halogen;
and
(f) impregnating the composition with a non-acidic aqueous solution of an alkali metal compound.

4 more elements

Dependencies are inferred from the claim text.