Paraffin isomerization and disproportionation catalyzed by Pd-loaded fluorided mordenites

Document Type

Article

Publication Date

1-1-1989

Abstract

Fluorided, Pd-loaded (~1.1 wt% Pd) mordenites, with 8, 12, 28, and 100% replacement of-OH groups, were synthesized from H-mordenite. These materials were characterized by IR, XRD, SEM, the adsorption of N2 and 2-methylpentane, and their activity for paraffin reactions. Except in the case of 100% nominal fluoridation, the fluorided mordenites retained their crystallinity, displayed enhanced acid strengths and adsorption capacities for paraffinic hydrocarbons, and were catalytically active (at 533-573 K and ~0.1 bar hydrocarbon partial pressure) for the transformation of n-butane to isobutane and products of both higher and lower molecular weights. The presence of a small amount of isobutene in the feed greatly accelerated these transformations and increased yields to the pentane isomers. The primary reactions were apparently acid-catalyzed, with the role of Pd confined to activity maintenance. The mildly fluorided zeolites in some cases proved more active overall than the parent zeolites H-mordenite and Pd-mordenite and were especially selective for the formation of the pentane isomers, apparently through a combination of disproportionation reactions and secondary alkylation reactions involving light hydrocarbon primary products. © 1989.

Publication Source (Journal or Book title)

Journal of Catalysis

First Page

322

Last Page

334

This document is currently not available here.

Share

COinS