Journal
APPLIED CATALYSIS A-GENERAL
Volume 455, Issue -, Pages 46-57Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2013.01.020
Keywords
Selective ring opening; Open-chain decanes; Ir/Beta; HIPEROCs; Bifunctional catalysis; Hydrogenolysis; Decalin
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Decalin was converted in a flow-type reactor under a hydrogen pressure of 5.2 MPa on Ir/H,A-Beta zeolite catalysts, where A stands for an alkali metal cation. In one series of catalysts, the Ir content was 3 wt.%, and the nature of A was varied from lithium to cesium. In a second series, the iridium content in Ir/H,Cs-Beta was varied from 1 to 5 wt.%. On some of these catalysts, open-chain decanes (OCDs) were formed with unprecedented selectivities and yields of up to 47 and 44%, respectively. The term High-Performance Ring-Opening Catalysts (HIPEROCs) was defined. Evidence is presented for hydrogenolysis on the metal being the main ring-opening mechanism on HIPEROCs. The main function of the Bronsted-acid sites is a mild isomerization of six-membered into five-membered naphthenic rings which are much easier to open by hydrogenolysis. Valuable mechanistic information can be deduced from the carbon-number distributions and the naphthenes vs. alkanes content of the hydrocracked products (C-9-). (c) 2013 Elsevier B.V. All rights reserved.
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