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Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides

Sagar Jain, Jakub Jan Biedrzycki, Valter Maurino, Adriano Zecchina, Lorenzo Mino, Giuseppe Spoto

Journal of Materials Chemistry A, Volume: 2, Issue: 31, Start page: 12247

Swansea University Author: Sagar Jain

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DOI (Published version): 10.1039/C4TA01581A

Abstract

The interaction of acetylene with TiO2 (Evonik P25) was studied as a function of gas pressure and contact time by in situ vibrational (infrared and Raman) and electronic (UV-vis) spectroscopy and by gas chromatography-mass spectrometry analysis (GC-MS) of the reaction products. At low pressure the r...

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Published in: Journal of Materials Chemistry A
ISSN: 2050-7488 2050-7496
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa32897
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spelling 2017-04-06T11:49:50.9812606 v2 32897 2017-04-02 Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides 7073e179bb5b82db3e3efd3a8cd07139 Sagar Jain Sagar Jain true false 2017-04-02 EEN The interaction of acetylene with TiO2 (Evonik P25) was studied as a function of gas pressure and contact time by in situ vibrational (infrared and Raman) and electronic (UV-vis) spectroscopy and by gas chromatography-mass spectrometry analysis (GC-MS) of the reaction products. At low pressure the reaction proceeds through surface adsorption of acetylene and cyclotrimerization to benzene. At higher pressure (P > 100 mbar) the adsorption step is followed by the progressive formation of more complex oligomerization products containing an increasing number of conjugated double bonds. The final products obtained after mild heating at 373 K in acetylene excess absorb in the visible spectral region and confer to the system a strong blue color. These colored species are stable for many days in pure oxygen or air and cannot be extracted with common solvents, appearing strongly anchored to the TiO2 surface. The formation of saturated –CH3 and –CH2 groups during the oligomerization process and the spectroscopic and GC-MS results show that the colored species consist of polycyclic aromatic hydrocarbons containing a considerable number of condensed rings. Following these results, the controlled oligomerization of acetylene can represent a route for direct production of graphene-like species tightly anchored to the TiO2 surface, i.e. of composite materials of potential interest in photocatalysis or photovoltaic applications. Journal Article Journal of Materials Chemistry A 2 31 12247 2050-7488 2050-7496 31 12 2014 2014-12-31 10.1039/C4TA01581A COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-04-06T11:49:50.9812606 2017-04-02T00:29:25.7986432 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Sagar Jain 1 Jakub Jan Biedrzycki 2 Valter Maurino 3 Adriano Zecchina 4 Lorenzo Mino 5 Giuseppe Spoto 6
title Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
spellingShingle Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
Sagar Jain
title_short Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
title_full Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
title_fullStr Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
title_full_unstemmed Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
title_sort Acetylene oligomerization on the surface of TiO2: a step forward in the in situ synthesis of nanostructured carbonaceous structures on the surface of photoactive oxides
author_id_str_mv 7073e179bb5b82db3e3efd3a8cd07139
author_id_fullname_str_mv 7073e179bb5b82db3e3efd3a8cd07139_***_Sagar Jain
author Sagar Jain
author2 Sagar Jain
Jakub Jan Biedrzycki
Valter Maurino
Adriano Zecchina
Lorenzo Mino
Giuseppe Spoto
format Journal article
container_title Journal of Materials Chemistry A
container_volume 2
container_issue 31
container_start_page 12247
publishDate 2014
institution Swansea University
issn 2050-7488
2050-7496
doi_str_mv 10.1039/C4TA01581A
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
active_str 0
description The interaction of acetylene with TiO2 (Evonik P25) was studied as a function of gas pressure and contact time by in situ vibrational (infrared and Raman) and electronic (UV-vis) spectroscopy and by gas chromatography-mass spectrometry analysis (GC-MS) of the reaction products. At low pressure the reaction proceeds through surface adsorption of acetylene and cyclotrimerization to benzene. At higher pressure (P > 100 mbar) the adsorption step is followed by the progressive formation of more complex oligomerization products containing an increasing number of conjugated double bonds. The final products obtained after mild heating at 373 K in acetylene excess absorb in the visible spectral region and confer to the system a strong blue color. These colored species are stable for many days in pure oxygen or air and cannot be extracted with common solvents, appearing strongly anchored to the TiO2 surface. The formation of saturated –CH3 and –CH2 groups during the oligomerization process and the spectroscopic and GC-MS results show that the colored species consist of polycyclic aromatic hydrocarbons containing a considerable number of condensed rings. Following these results, the controlled oligomerization of acetylene can represent a route for direct production of graphene-like species tightly anchored to the TiO2 surface, i.e. of composite materials of potential interest in photocatalysis or photovoltaic applications.
published_date 2014-12-31T03:40:27Z
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score 11.035874

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