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Topics in Catalysis

, Volume 61, Issue 15–17, pp 1615–1623 | Cite as

Effect of Surface Tungstate W5+ Species on the Metathesis Activity of W-Doped Spherical Silica Catalysts

  • Suthasinee Watmanee
  • Kongkiate Suriye
  • Piyasan Praserthdam
  • Joongjai Panpranot
Original Paper
  • 95 Downloads

Abstract

The high surface area W-doped spherical silica (SSP) catalysts were prepared with different sequences of W and Si addition (W–Si(Alt), Si1–W2, and W1–Si2) by the sol–gel method with CTAB as a structure directing agent and compared with the impregnated one (W/SSP). All the catalysts exhibited high specific surface area (∼ 1100 m2 g−1) with a closely perfect spherical shape. The presence of surface/sub-surface tungstate W5+ species, crystalline bulk WO3, and tetrahedral tungsten oxide species on the prepared catalysts was investigated by means of X-ray photoelectron spectroscopy depth profile analysis, X-ray diffraction, and Raman spectroscopy. Without in situ reduction by the reactants/products, tungstate W5+ species was found on the top surface of the as-prepared W–Si(Alt) whereas for the Si1–W2, W/SSP, and W1–Si2, the W5+ appeared only on the sub-surface of the catalysts after 5 and 15 s Ar+ etching. The abundance of surface W5+ species is suggested to facilitate the establishment of the active tungsten carbenes and was correlated well to the catalytic activity in propene metathesis. The surface W5+-activity relationship of the WO3-based metathesis catalysts is useful especially when the catalyst activity did not depend solely on the amount of active tetrahedral coordinated tungsten oxides.

Keywords

Spherical silica Tungsten Tungsten-doped silica Tungstate W5+ species Metathesis 

Notes

Acknowledgements

Financial supports from the SCG Chemicals Co, Ltd., the Thailand Research Fund (BRG6180001), and Chulalongkorn University are gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical Engineering, Faculty of Engineering, Center of Excellence on Catalysis and Catalytic Reaction EngineeringChulalongkorn UniversityBangkokThailand
  2. 2.SCG Chemicals Co., Ltd.BangkokThailand

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