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Properties of Sm2O3–ZrO2 composite oxides and their catalytic performance in isosynthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
43981 45998 2007 9 PDF Available
Title
Properties of Sm2O3–ZrO2 composite oxides and their catalytic performance in isosynthesis
Abstract

Sm2O3 doped ZrO2-based catalysts (Sm2O3–ZrO2 composite oxide) were prepared by co-precipitation and their physical properties (texture and structure) and chemical properties (acid–base and redox) were characterized with the methods of N2 adsorption–desorption isotherm, powder X-ray diffraction, Raman spectroscopy, NH3 and CO2 temperature programmed desorption and H2 temperature programmed reduction. The catalytic performances of the catalysts (activity and selectivities) were evaluated in the CO hydrogenation to isobutene and isobutane (isosynthesis) under the reaction conditions of 673 K, 5.0 MPa, and 650 h−1. The relationship between the catalytic performance and the physical/chemical properties of Sm2O3–ZrO2 catalysts were also examined. The catalytic activity and selectivity of the Sm2O3–ZrO2 catalysts varied with Sm2O3 doping. The physical properties of the catalysts, such as cumulative pore volumes, average pore diameters and crystal sizes had some influences on the activity and selectivity in the isosynthesis. CO conversion increased with an increase in the amount of the acidic sites on the surface of Sm2O3–ZrO2 catalysts, while iso-C4 percentage in total hydrocarbons increased with an increase in the amount of the basic sites. The addition of Sm2O3 into ZrO2 enhanced the reducibility of Sm2O3–ZrO2 catalysts. The highest CO conversion (21.6%) and C4 selectivity (41.8%) were obtained over the catalyst that had a maximum amount of H2 consumptions (57.7 μmol g−1) in the TPR measurement for Sm2O3–ZrO2 catalysts. A coordination of the acid–base properties and the redox property may play important role for the improvement of the catalytic performances of the isosynthesis.

Graphical abstractSm2O3–ZrO2 composite oxides were prepared by co-precipitation, characterized with the methods of N2 adsorption desorption isotherm, powder X-ray diffraction, Raman spectra, NH3 and CO2 temperature programmed desorption and H2 temperature programmed reduction, and evaluated as the catalysts in the isosynthesis under the reaction conditions of 673 K, 5.0 MPa and 650 h−1. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Isosynthesis; CO hydrogenation; Sm2O3–ZrO2 composite oxide; Acid–base; Redox
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Properties of Sm2O3–ZrO2 composite oxides and their catalytic performance in isosynthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 319, 1 March 2007, Pages 119–127
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