The adsorption and reactions of methyl iodide on powdered Ag/TiO 2

Chaochin Su; Chi Hong Liao; Jian Di Wang; Chen Ming Chiu; Bo Jou Chen

doi:10.1016/j.cattod.2004.04.053

The adsorption and reactions of methyl iodide on powdered Ag/TiO ₂

Chaochin Su
, Chi Hong Liao
, Jian Di Wang
, Chen Ming Chiu
, Bo Jou Chen

Department of Molecular Science and Engineering

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The adsorption, thermal reaction, and photoreaction of methyl iodide on powdered Ag-covered TiO₂ (Ag/TiO₂) were studied using Fourier transform infrared spectroscopy. The Ag was deposited on TiO₂ by photoreduction of AgNO₃. The resultant Ag/TiO₂ was analyzed by TEM, ESCA, and AA. Evolution of methane was observed in the absence of oxygen for thermal reaction at temperature above 623K. Photoreaction showed the enhancement in CH₃I dissociation due to the presence of Ag on TiO₂ surface. In this reaction, methyl radicals produced were recombined to form ethane molecules over the Ag/TiO₂. The same reactions in the presence of oxygen change their pathways completely yielding oxygen-containing products. In thermal reaction, CO_(g), CO _2(g), CH₂O_(g), (CH₃) ₂O_(g), and H₂O_(g) were observed. On the other hand, in the photochemical reactions, CO_2(g), H ₂O_(g), and surface formate groups were produced. Possible pathways for present thermal and photochemical reactions are discussed and the results were compared with that obtained using bare TiO₂.

Original language	English
Pages (from-to)	71-79
Number of pages	9
Journal	Catalysis Today
Volume	97
Issue number	1 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.cattod.2004.04.053
State	Published - 2004

Bibliographical note

Funding Information:
We gratefully acknowledge the financial support of the National Science Council of the Republic of China (Grant no. NSC 92-2113-M-027-001) for this research. Stimulating discussion with Prof. J.-L. Lin and Prof. J.-C. Lin is gratefully acknowledged. The authors wish to thank Prof. J.-C. Lin for providing the experimental facility, including FTIR, IR cell, vacuum line, and gas manifold for this study.

Keywords

Adsorption
Ag/TiO
ESCA
Photoreaction
Thermal reaction

Access to Document

10.1016/j.cattod.2004.04.053

Cite this

@article{d14f1e1c71ca4f95b6ed2a042a24cf7e,

title = "The adsorption and reactions of methyl iodide on powdered Ag/TiO 2 ",

abstract = "The adsorption, thermal reaction, and photoreaction of methyl iodide on powdered Ag-covered TiO2 (Ag/TiO2) were studied using Fourier transform infrared spectroscopy. The Ag was deposited on TiO2 by photoreduction of AgNO3. The resultant Ag/TiO2 was analyzed by TEM, ESCA, and AA. Evolution of methane was observed in the absence of oxygen for thermal reaction at temperature above 623K. Photoreaction showed the enhancement in CH3I dissociation due to the presence of Ag on TiO2 surface. In this reaction, methyl radicals produced were recombined to form ethane molecules over the Ag/TiO2. The same reactions in the presence of oxygen change their pathways completely yielding oxygen-containing products. In thermal reaction, CO(g), CO 2(g), CH2O(g), (CH3) 2O(g), and H2O(g) were observed. On the other hand, in the photochemical reactions, CO2(g), H 2O(g), and surface formate groups were produced. Possible pathways for present thermal and photochemical reactions are discussed and the results were compared with that obtained using bare TiO2.",

keywords = "Adsorption, Ag/TiO, ESCA, Photoreaction, Thermal reaction",

author = "Chaochin Su and Liao, \{Chi Hong\} and Wang, \{Jian Di\} and Chiu, \{Chen Ming\} and Chen, \{Bo Jou\}",

note = "Funding Information: We gratefully acknowledge the financial support of the National Science Council of the Republic of China (Grant no. NSC 92-2113-M-027-001) for this research. Stimulating discussion with Prof. J.-L. Lin and Prof. J.-C. Lin is gratefully acknowledged. The authors wish to thank Prof. J.-C. Lin for providing the experimental facility, including FTIR, IR cell, vacuum line, and gas manifold for this study.",

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volume = "97",

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TY - JOUR

T1 - The adsorption and reactions of methyl iodide on powdered Ag/TiO 2

AU - Su, Chaochin

AU - Liao, Chi Hong

AU - Wang, Jian Di

AU - Chiu, Chen Ming

AU - Chen, Bo Jou

N1 - Funding Information: We gratefully acknowledge the financial support of the National Science Council of the Republic of China (Grant no. NSC 92-2113-M-027-001) for this research. Stimulating discussion with Prof. J.-L. Lin and Prof. J.-C. Lin is gratefully acknowledged. The authors wish to thank Prof. J.-C. Lin for providing the experimental facility, including FTIR, IR cell, vacuum line, and gas manifold for this study.

PY - 2004

Y1 - 2004

N2 - The adsorption, thermal reaction, and photoreaction of methyl iodide on powdered Ag-covered TiO2 (Ag/TiO2) were studied using Fourier transform infrared spectroscopy. The Ag was deposited on TiO2 by photoreduction of AgNO3. The resultant Ag/TiO2 was analyzed by TEM, ESCA, and AA. Evolution of methane was observed in the absence of oxygen for thermal reaction at temperature above 623K. Photoreaction showed the enhancement in CH3I dissociation due to the presence of Ag on TiO2 surface. In this reaction, methyl radicals produced were recombined to form ethane molecules over the Ag/TiO2. The same reactions in the presence of oxygen change their pathways completely yielding oxygen-containing products. In thermal reaction, CO(g), CO 2(g), CH2O(g), (CH3) 2O(g), and H2O(g) were observed. On the other hand, in the photochemical reactions, CO2(g), H 2O(g), and surface formate groups were produced. Possible pathways for present thermal and photochemical reactions are discussed and the results were compared with that obtained using bare TiO2.

AB - The adsorption, thermal reaction, and photoreaction of methyl iodide on powdered Ag-covered TiO2 (Ag/TiO2) were studied using Fourier transform infrared spectroscopy. The Ag was deposited on TiO2 by photoreduction of AgNO3. The resultant Ag/TiO2 was analyzed by TEM, ESCA, and AA. Evolution of methane was observed in the absence of oxygen for thermal reaction at temperature above 623K. Photoreaction showed the enhancement in CH3I dissociation due to the presence of Ag on TiO2 surface. In this reaction, methyl radicals produced were recombined to form ethane molecules over the Ag/TiO2. The same reactions in the presence of oxygen change their pathways completely yielding oxygen-containing products. In thermal reaction, CO(g), CO 2(g), CH2O(g), (CH3) 2O(g), and H2O(g) were observed. On the other hand, in the photochemical reactions, CO2(g), H 2O(g), and surface formate groups were produced. Possible pathways for present thermal and photochemical reactions are discussed and the results were compared with that obtained using bare TiO2.

KW - Adsorption

KW - Ag/TiO

KW - ESCA

KW - Photoreaction

KW - Thermal reaction

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