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Novel CeO2 promoted TiO2–ZrO2 nano-oxide catalysts for oxidative dehydrogenation of p-diethylbenzene utilizing CO2 as soft oxidant

Paper ID Volume ID Publish Year Pages File Format Full-Text
47029 46456 2010 9 PDF Available
Title
Novel CeO2 promoted TiO2–ZrO2 nano-oxide catalysts for oxidative dehydrogenation of p-diethylbenzene utilizing CO2 as soft oxidant
Abstract

The influence of ceria on structural and catalytic properties of TiO2–ZrO2 mixed oxide was investigated for oxidative dehydrogenation (ODH) of p-diethylbenzene (DEB) to p-divinylbenzene (DVB) utilizing CO2 as soft oxidant. The investigated catalysts were synthesized by coprecipitation and impregnation methods involving microwave treatment. Catalyst characterization was achieved using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), BET surface area and temperature programmed desorption/oxidation (TPD/TPO) methods. The XRD and TEM results revealed that the prepared samples are in nanocrystalline form with 10–20 nm size. The presence of acid–base sites and their distribution was examined by NH3 and CO2 TPD measurements. The ceria promoted sample exhibited more number of acid sites. The TPO measurements revealed that CO2 dissociates over the reduced surface of the catalysts. Among various catalysts investigated, the microwave treated CeO2/TiO2–ZrO2 sample exhibited better conversion and a high product selectivity. The time-on-stream studies revealed that ceria promoted TiO2–ZrO2 catalysts exhibit higher stability for ODH of DEB.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Ceria promoted TiO2–ZrO2 nano-oxides were exploited for oxidative dehydrogenation of a commercially significant reaction p-diethylbenzene to p-divinylbenzene utilizing CO2 as soft oxidant. ▶ Utilization of CO2 as a soft oxidant is most significant in view of both economical and environmental benefits. ▶ The promotional effects of ceria over TiO2–ZrO2 nano-oxides were examined with various characterization techniques, which revealed that ceria influences profoundly the redox and surface acid–base properties. ▶ Novel experiment to know the extent of CO2 utilization was conducted by H2-TPR followed by CO2-TPO measurements and identified that ceria promoted catalyst facilitates CO2 dissociation over the reduced surface of the catalysts. ▶ Among the investigated catalysts, the CeO2/TiO2–ZrO2 combination treated with microwave energy exhibited a high conversion (74%) and excellent product selectivity (98%).

Keywords
p-Diethylbenzene; Oxidative dehydrogenation; CO2 as soft oxidant; TiO2–ZrO2 mixed oxide; Acid–base sites
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Novel CeO2 promoted TiO2–ZrO2 nano-oxide catalysts for oxidative dehydrogenation of p-diethylbenzene utilizing CO2 as soft oxidant
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 3–4, 20 October 2010, Pages 472–480
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