Advances in nano research

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Hydrogen-bonded clusters in transformed Lewis acid to new Brønsted acid over WOx/SiO2 catalyst

  • Boonpai, Sirawat (Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Wannakao, Sippakorn (SCG Chemicals, Co., Ltd.) ;
  • Panpranot, Joongjai (Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Praserthdam, Supareak (Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Chirawatkul, Prae (Synchrotron Light Research Institute (Public Organization) 111 University Avenue) ;
  • Praserthdam, Piyasan (Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University)
  • Received : 2020.08.30
  • Accepted : 2021.01.09
  • Published : 2022.03.25
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Abstract

The behavior of hydrogen species on the surface of the catalyst during the Lewis acid transformation to form Brønsted acid sites over the spherical silica-supported WOx catalyst was investigated. To understand the structure-activity relationship of Lewis acid transformation and hydrogen bonding interactions, we explore the potential of using the in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) with adsorbed ammonia and hydrogen exposure. From the results of in situ DRIFTS measurements, Lewis acid sites on surface catalysts were transformed into new Brønsted acid sites upon hydrogen exposure. The adsorbed NH3 on Lewis acid sites migrated to Brønsted acid sites forming NH4+. The results show that the dissociated H atoms present on the catalyst surface formed new Si-OH hydroxyl species - the new Brønsted acid site. Besides, the isolated Si-O-W species is the key towards H-bond and Si-OH formation. Additionally, the H atoms adsorbed surrounding the Si-O-W species of mono-oxo O=WO4 and di-oxo (O=)2WO2 species, where the Si-O-W species are the main species presented on the Inc-SSP catalysts than that of the IWI-SSP catalysts.

Keywords

Acknowledgement

The authors acknowledge SCG Chemical Co., Ltd for financial support. We also acknowledge the Synchrotron Light Research Institute (Public Organization), SLRI, for the support of beamtime, and we appreciate the staff of beamline 1.1W for their assistance.

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