Synthesis, characterization and catalytic properties of titania–silica catalysts

Mohamed, Mohamed Mokhtar; Salama, Tarek M.; Yamaguchi, Tomoya

doi:10.1016/s0927-7757(02)00002-x

Cited by 75 publications

(35 citation statements)

References 22 publications

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“…The bands at 1150-1240 are associated to the ester group vibrations in the polyester structure. For sample D-2, TiO 2 bands between 500 and 800 cm , as well as the asymmetric stretching band of Si-O-Si at 1060 cm −1 are also observed (Shafei et al, 1995;Mohamed et al, 2002). However, there is no strong adsorption band which can represent the formation of Ti-O-Si linkage observed on the IR spectrum of sample D-2, indicating that the immobilization of TiO 2 on the substrate through SiO 2 binder by the dip coating method is not as strong as those using the spray coating method in this study.…”

Section: Infrared Spectroscopy Of the Spray/dip-coated Samplesmentioning

confidence: 90%

“…For sample S-2, TiO 2 bands are observed in the range of 500-800 cm −1 with strong adsorption band appearing at 600 cm −1 representing of TiO 2 matrixes in six-fold coordination (Mohamed et al, 2002). The bands at 1060 cm −1 and 1080 cm −1 can be assigned to the asymmetric stretching and bending mode of the Si-O-Si banding (Shafei et al, 1995;Mohamed et al, 2002). A band at 950 cm −1 can be assigned to the stretching of Si-O species of the Ti-O-Si linkage which is formed by the inclusion of Ti 4+ into the SiO 2 matrixes (Yamashita et al, 1998).…”

Section: Infrared Spectroscopy Of the Spray/dip-coated Samplesmentioning

confidence: 97%

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Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Han

Chang

Zhang

et al. 2012

Aerosol Air Qual. Res.

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Heterogeneous photocatalytic oxidation (PCO) has shown great potential for indoor air purification of gaseous pollutants. Research attention has been drawn to the synthesis of new functional photocatalysts, as well as to kinetic studies of the influences of various reaction parameters, e.g., relative humidity. Nevertheless, when applied for practical use, the coating method and coating stability of are also important factors that will directly affect the removal efficiency. In the present study, a simple and economical spray coating method was developed to effectively immobilize TiO 2 nanoparticles onto a polyester fiber filter at low temperature. Colloidal silica was added as a binder in the coating suspension. PCO efficiency evaluation of the coating was carried out using gaseous formaldehyde. The results indicate that the formaldehyde removal rate is associated with the amount of binder added. The highest removal rate was achieved for a coating with the TiO 2 to binder (SiO 2 equivalent) mass ratio of 1:1, with the results supported by XRF, SEM, FTIR and BET analyses. As compared to the conventional dip coating method, the spray-coated sample showed much higher PCO efficiency and stability, which may be mainly attributed to the more uniform dispersion of the catalyst and the stronger binding formed during high pressure spray coating. This coating method has great potential for large-scale applications of immobilized photocatalyst for indoor air purification.

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Section: Infrared Spectroscopy Of the Spray/dip-coated Samplesmentioning

confidence: 90%

Section: Infrared Spectroscopy Of the Spray/dip-coated Samplesmentioning

confidence: 97%

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Han

Chang

Zhang

et al. 2012

Aerosol Air Qual. Res.

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“…The photocatalytic activity of nanosilica/titania composites have been studied more widely and thoroughly [57][58][59][60][61][62][63][64][65][66][67][68] than MO-doped SiO 2 /TiO 2 (M: Cu or Ni) systems.…”

Section: Fig 1 Energy Level (N) Distribution For Differentmentioning

confidence: 99%

Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO

Nazarkovsky¹,

Гунько²,

Wójcik³

et al. 2015

Him. Fiz. Tehnol. Poverhni

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“…and its IR spectrum includes a band of modes at 885 cm -1 and 989 cm -1 generated by Si-O stretching mode and at 608 cm -1 and 430 cm -1 due to O-Si-O bending mode [35,36]. Whereas, SiO2 can be identified from Si-O-Si stretch at 1097 cm -1 [37] and pure ZrO2 exhibits the IR band around 545 cm -1 [38].…”

Section: Ft-irmentioning

confidence: 99%

MoO3/SiO2-ZrO2 Catalyst: Eeffect of Calcination Temperature on Physico-chemical Properties and Activities in Nitration of Toluene

Kemdeo

2012

Bull. Chem. React. Eng. Catal.

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12 wt % molybdena was deposited over 1:1 silica zirconia mixed oxide support and the resultant catalyst was calcined between the 500 to 700 oC range of temperature. The samples were characterized by XRD, FT-IR, BET, SEM, NH3-TPD and pyridine adsorbed FT-IR techniques. Nitration of toluene was studied as a model reaction over the prepared catalysts and parameters like effect of reaction temperature, effect of various solvents, catalyst reusability are studied. It was found that conversion of toluene varies with the presence of Brönsted acid sites over the catalyst surface and para-nitrotoulene selectivity is associated with pore size of the catalyst. Over the same catalysts, nitration was extended for some other aromatics. Avoid of sulfuric acid in the present process is an interesting concern in view of green chemistry. © 2012 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)

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Synthesis, characterization and catalytic properties of titania–silica catalysts

Cited by 75 publications

References 22 publications

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Preparation of TiO2-Coated Polyester Fiber Filter by Spray-Coating and Its Photocatalytic Degradation of Gaseous Formaldehyde

Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO

MoO3/SiO2-ZrO2 Catalyst: Eeffect of Calcination Temperature on Physico-chemical Properties and Activities in Nitration of Toluene

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