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In2O3-doped Pt/WO3/ZrO2 as a novel efficient catalyst for hydroisomerization of n-heptane

Paper ID Volume ID Publish Year Pages File Format Full-Text
40872 45869 2012 6 PDF Available
Title
In2O3-doped Pt/WO3/ZrO2 as a novel efficient catalyst for hydroisomerization of n-heptane
Abstract

A series of Pt catalysts supported on In2O3-doped (In/Zr molar ratio = 0.01–0.04) WO3/ZrO2 (9–24 wt.% WO3) have been tested for the hydroisomerization of n-heptane at 473 K. Several techniques including X-ray diffraction, N2 adsorption, CO chemisorption and X-ray photoelectron spectroscopy were applied to characterize the physicochemical properties of the as-synthesized materials. The catalytic activity is strongly dependent on the surface WO3 loading and In/Zr ratio. The maximum activity was observed for the sample with a In/Zr molar ratio of 0.02, which gave 72% n-heptane conversion and 96% C7 isomer selectivity at 473 K, and can be kept constant over 80 h under reaction reactions. The incorporation of small amounts of In2O3 into Pt/WO3/ZrO2 increases the activity significantly (from 37% to 72%) and improves the isomerization selectivity moderately (from 90% to 96% at a conversion of 72%). The results of cumene cracking reveal that the remarkable activity and selectivity of the In2O3-promoted catalysts are caused by an enhancement in the number of Brønsted acid sites under reaction conditions and in the hydride transfer reaction rate of isomerized carbenium ions with hydride ions originating from hydrogen molecules.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (64 K)Download as PowerPoint slideHighlights► Pt/WO3/ZrO2 catalyst was modified by small amounts of In2O3. ► Doping In2O3 into Pt/WO3/ZrO2 enhanced Pt dispersion and Pt0/Pt2+ ratio. ► Brønsted acid sites were generated under reaction conditions. ► The addition of In2O3 to Pt/WO3/ZrO2 improved the catalytic performance markedly. ► Pt/WO3/In2O3-ZrO2 exhibited a constant catalytic performance for at least 80 h.

Keywords
n-Heptane isomerization; Pt/WO3/ZrO2; In2O3 doping; Promoting effect
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In2O3-doped Pt/WO3/ZrO2 as a novel efficient catalyst for hydroisomerization of n-heptane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 433–434, 8 August 2012, Pages 69–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us