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Legutko P, Stelmachowski P, Yu X, Zhao Z, Sojka Z, Kotarba A. Catalytic Soot Combustion─General Concepts and Alkali Promotion. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- Piotr Legutko
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
| | - Paweł Stelmachowski
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
| | - Xuehua Yu
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, China
| | - Zhen Zhao
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, China
| | - Zbigniew Sojka
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
| | - Andrzej Kotarba
- Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
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Feng X, Zhang S, Liu R, Ma J, Xu X, Xu J, Fang X, Wang X. Niobium oxide promoted with alkali metal nitrates for soot particulate combustion: elucidating the vital role of active surface nitrate groups. Phys Chem Chem Phys 2022; 24:3250-3258. [PMID: 35045149 DOI: 10.1039/d1cp04215g] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
With the target of developing efficient base metal oxide catalysts for soot particulate combustion, Nb2O5 catalysts promoted using different alkali metal nitrates have been prepared via an impregnation method. The activity of all the modified catalysts is better than that of the pure Nb2O5, and follows the sequence of CsNb1-9 > KNb1-9 > NaNb1-9 > LiNb1-9 > Nb2O5. It has been discovered that the original LiNO3 and NaNO3 precursors were decomposed into inert Li2O and Na2O on LiNb1-9 and NaNb1-9 during the calcination process. However, the KNO3 and CsNO3 precursors were intact on KNb1-9 and CsNb1-9 due to the strong stabilization effect of the K+ and Cs+ cations. As confirmed using different means, surface nitrates are the predominant active centers that contribute to the soot oxidation activity, through the redox cycles between nitrate (NO3-) and nitrite (NO2-) groups. Due to the existence of a large quantity of active surface NO3- groups, KNb1-9 and CsNb1-9 thus exhibit a much better reaction performance than LiNb1-9 and NaNb1-9.
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Affiliation(s)
- Xiaohui Feng
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Shijing Zhang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Rui Liu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Jun Ma
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Xianglan Xu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Junwei Xu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Xiuzhong Fang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
| | - Xiang Wang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China.
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Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources. Catalysts 2019. [DOI: 10.3390/catal9030297] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This work presents the physicochemical characterization and activity of zirconia-supported silver catalysts for the oxidation of pollutants present in diesel engine exhaust (propane, propene, naphthalene and soot). A series of silver-supported catalysts AgxZ (x = 1, 5 and 10 wt.%, Z = zirconia) were prepared, which were studied by various characterization techniques. The results show that silver is mainly found under the form of small metal nanoparticles (<10 nm) dispersed over the support. The metallic phase coexists with the AgOx oxidic phases. Silver is introduced onto the zirconia, generating Ag–ZrO2 catalysts with high activity for the oxidation of propene and naphthalene. These catalysts also show some activity for soot combustion. Silver species can contribute with zirconia in the catalytic redox cycle, through a synergistic effect, providing sites that facilitate the migration and availability of oxygen, which is favored by the presence of structural defects. This is a novel application of the AgOx–Ag/ZrO2 system in the combustion reaction of propene and naphthalene. The results are highly promising, given that the T50 values found for both model molecules are quite low.
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Yan J, Zhang C, Ning C, Tang Y, Zhang Y, Chen L, Gao S, Wang Z, Zhang W. Vapor phase condensation of methyl acetate with formaldehyde to preparing methyl acrylate over cesium supported SBA-15 catalyst. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.11.014] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Jamil SM, Dzarfan Othman MH, Rahman MA, Jaafar J, Ismail AF, Mohamed MA. Role of lithium oxide as a sintering aid for a CGO electrolyte fabricated via a phase inversion technique. RSC Adv 2015. [DOI: 10.1039/c5ra09268j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The incorporation of lithium oxide (Li2O) as a liquid phase sintering additive has specific advantages for electrolyte membrane fabrication.
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Affiliation(s)
- Siti Munira Jamil
- Advanced Membrane Technology Research Centre (AMTEC)
- Universiti Teknologi Malaysia
- Johor Bahru
- Malaysia
| | - Mohd Hafiz Dzarfan Othman
- Advanced Membrane Technology Research Centre (AMTEC)
- Universiti Teknologi Malaysia
- Johor Bahru
- Malaysia
| | - Mukhlis A. Rahman
- Advanced Membrane Technology Research Centre (AMTEC)
- Universiti Teknologi Malaysia
- Johor Bahru
- Malaysia
| | - Juhana Jaafar
- Advanced Membrane Technology Research Centre (AMTEC)
- Universiti Teknologi Malaysia
- Johor Bahru
- Malaysia
| | - Ahmad Fauzi Ismail
- Advanced Membrane Technology Research Centre (AMTEC)
- Universiti Teknologi Malaysia
- Johor Bahru
- Malaysia
| | - Mohamad Azuwa Mohamed
- Advanced Membrane Technology Research Centre (AMTEC)
- Universiti Teknologi Malaysia
- Johor Bahru
- Malaysia
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