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Effect of pretreatment atmosphere of WO(x)/SiO(2) catalysts on metathesis of ethylene and 2-butene to propylene
The effect of a gas pretreatment atmosphere (pure N(2), pure H(2) and mixed H(2)/N(2)) on the metathesis reaction between ethylene and 2-butene to propylene over calcined and non-calcined WO(3)/SiO(2) catalysts was investigated. The non-calcined catalysts exhibited higher activity than the calcined...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9079092/ https://www.ncbi.nlm.nih.gov/pubmed/35542781 http://dx.doi.org/10.1039/c8ra01093e |
Sumario: | The effect of a gas pretreatment atmosphere (pure N(2), pure H(2) and mixed H(2)/N(2)) on the metathesis reaction between ethylene and 2-butene to propylene over calcined and non-calcined WO(3)/SiO(2) catalysts was investigated. The non-calcined catalysts exhibited higher activity than the calcined catalysts under different gas pretreatment atmospheres. The non-calcined catalyst with the use of pure H(2) pretreatment showed the highest catalytic performances. As revealed by various characterization results from N(2) physisorption, XRD, XPS, TEM, SEM-EDX, UV-Vis, Raman, H(2)-TPR, and NH(3)-TPD techniques, the WO(2.83) phase occurring from the H(2) pretreatment of the non-calcined catalyst played an important role on the high activity of the catalyst. In addition, better tungsten dispersion, higher isolated surface tetrahedral tungsten oxide species, and W(5+) species were obtained on the H(2)-treated non-calcined WO(3)/SiO(2) catalyst. |
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