Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition
In this study, the ability of ozone to oxidise toluene present in low levels into CO and CO<sub>2</sub> was studied. The catalytic ozonation of toluene was carried out in a micro-fixed bed reactor. The oxidation was done in two steps: toluene adsorption on the catalyst followed by sequen...
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MDPI AG
2022-04-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/12/4/421 |
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| author | Kandukuri Bhargavi Debjyoti Ray Piu Chawdhury Sairam Malladi Thatikonda Shashidhar Challapalli Subrahmanyam |
| author_facet | Kandukuri Bhargavi Debjyoti Ray Piu Chawdhury Sairam Malladi Thatikonda Shashidhar Challapalli Subrahmanyam |
| author_sort | Kandukuri Bhargavi |
| collection | DOAJ |
| description | In this study, the ability of ozone to oxidise toluene present in low levels into CO and CO<sub>2</sub> was studied. The catalytic ozonation of toluene was carried out in a micro-fixed bed reactor. The oxidation was done in two steps: toluene adsorption on the catalyst followed by sequential ozone desorption. Toluene breakdown by ozone at low temperature and atmospheric pressure was achieved using γ-Al<sub>2</sub>O<sub>3</sub> supported transition metal oxides impregnated with a reduced noble metal. The catalyst Ag–CoO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> efficiently oxidised and transformed toluene into products (52.4% CO<sub>x</sub> yield). This catalyst has a high surface area, more acidic sites, and lattice oxygens for better toluene oxidation. The addition of Ag to the CoO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst surface improved toluene adsorption on the catalyst surface, resulting in improved product yield, selectivity, and carbon balance. |
| first_indexed | 2024-03-09T11:02:41Z |
| format | Article |
| id | doaj.art-e918b696a62d4ff890c4c628f7bf6ba7 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T11:02:41Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-e918b696a62d4ff890c4c628f7bf6ba72023-12-01T01:11:45ZengMDPI AGCatalysts2073-43442022-04-0112442110.3390/catal12040421Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag AdditionKandukuri Bhargavi0Debjyoti Ray1Piu Chawdhury2Sairam Malladi3Thatikonda Shashidhar4Challapalli Subrahmanyam5Department of Chemistry, Indian Institute of Technology Hyderabad, Hyderabad 502 285, IndiaDepartment of Chemistry, Indian Institute of Technology Hyderabad, Hyderabad 502 285, IndiaDepartment of Chemistry, Indian Institute of Technology Hyderabad, Hyderabad 502 285, IndiaDepartment of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Hyderabad 502 285, IndiaDepartment of Civil Engineering, Indian Institute of Technology Hyderabad, Hyderabad 502 285, IndiaDepartment of Chemistry, Indian Institute of Technology Hyderabad, Hyderabad 502 285, IndiaIn this study, the ability of ozone to oxidise toluene present in low levels into CO and CO<sub>2</sub> was studied. The catalytic ozonation of toluene was carried out in a micro-fixed bed reactor. The oxidation was done in two steps: toluene adsorption on the catalyst followed by sequential ozone desorption. Toluene breakdown by ozone at low temperature and atmospheric pressure was achieved using γ-Al<sub>2</sub>O<sub>3</sub> supported transition metal oxides impregnated with a reduced noble metal. The catalyst Ag–CoO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> efficiently oxidised and transformed toluene into products (52.4% CO<sub>x</sub> yield). This catalyst has a high surface area, more acidic sites, and lattice oxygens for better toluene oxidation. The addition of Ag to the CoO<sub>x</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalyst surface improved toluene adsorption on the catalyst surface, resulting in improved product yield, selectivity, and carbon balance.https://www.mdpi.com/2073-4344/12/4/421VOCtransition metal oxidescatalytic ozonation |
| spellingShingle | Kandukuri Bhargavi Debjyoti Ray Piu Chawdhury Sairam Malladi Thatikonda Shashidhar Challapalli Subrahmanyam Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition Catalysts VOC transition metal oxides catalytic ozonation |
| title | Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition |
| title_full | Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition |
| title_fullStr | Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition |
| title_full_unstemmed | Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition |
| title_short | Oxidation of Toluene by Ozone over Surface-Modified γ-Al<sub>2</sub>O<sub>3</sub>: Effect of Ag Addition |
| title_sort | oxidation of toluene by ozone over surface modified γ al sub 2 sub o sub 3 sub effect of ag addition |
| topic | VOC transition metal oxides catalytic ozonation |
| url | https://www.mdpi.com/2073-4344/12/4/421 |
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