fulltext.study @t Gmail

Aerosol route to nanostructured WO3-SiO2-Al2O3 metathesis catalysts: Toward higher propene yield

Paper ID Volume ID Publish Year Pages File Format Full-Text
40025 45842 2014 9 PDF Available
Title
Aerosol route to nanostructured WO3-SiO2-Al2O3 metathesis catalysts: Toward higher propene yield
Abstract

•Tungsten-based heterogeneous catalyst prepared in one-step via the aerosol process.•Compared with classical impregnation of silica, alumina or silica–alumina.•Aerosol process offers optimized texture, WOx dispersion, acidity and reducibility.•Much higher metathesis activity and propylene yield.

Aerosol processing is presented as a powerful new method to yield in one step highly efficient olefin metathesis catalysts. Combined with sol–gel chemistry, evaporation induced self-assembly and polyanions, it allows a fine tuning of the dispersion of WOx species and the generation of acidic matrices which are key parameters controlling the formation of active metathesis sites. These spray dried catalysts are characterized by N2-physisorption, XRD, TEM, NH3-TPD, TPO, TPR, ICP-AES and systematically compared to relevant reference catalysts prepared by impregnation methods on different carriers (silica, alumina and silica–alumina). Tested in the industrially relevant cross-metathesis of ethene and 2-butene to propene, the new catalyst outcompetes reference catalysts, reaching 68 mmolpropene g−1 h−1 at 250 °C. By-products formed by isomerization reactions remain very low and high propene yields (39%) are reached.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (201 K)Download as PowerPoint slide

Keywords
Aerosol; Sol–gel; EISA; Mesoporous mixed oxide; Surfactant; Alkene metathesis; Ethylene; Propylene
First Page Preview
Aerosol route to nanostructured WO3-SiO2-Al2O3 metathesis catalysts: Toward higher propene yield
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 470, 30 January 2014, Pages 458–466
Authors
, , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis