Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot
In this work, the physical-chemical and morphological evolution of CeO2-ZrO2 solid solutions caused by hydrothermal processing time, and its effects on catalytic diesel soot elimination were studied. SEM and TEM results show that the CeO2-ZrO2 nanocrystal particles gradually aggregate with the exten...
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Elsevier
2025-10-01
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| Rangatū: | Fuel Processing Technology |
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| Urunga tuihono: | http://www.sciencedirect.com/science/article/pii/S0378382025001183 |
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| author | Zhengzheng Yang Zhi Chen Na Zhang Yang Zhou Dezhou Luo Tai Jin Huangwei Zhang |
| author_facet | Zhengzheng Yang Zhi Chen Na Zhang Yang Zhou Dezhou Luo Tai Jin Huangwei Zhang |
| author_sort | Zhengzheng Yang |
| collection | DOAJ |
| description | In this work, the physical-chemical and morphological evolution of CeO2-ZrO2 solid solutions caused by hydrothermal processing time, and its effects on catalytic diesel soot elimination were studied. SEM and TEM results show that the CeO2-ZrO2 nanocrystal particles gradually aggregate with the extension of hydrothermal processing time. A moderate hydrothermal processing time can facilitate the engineering of catalyst morphology at micronmeter scale, however, excessive hydrothermal synthesis time would contrarily destroy the micrometer scaled catalyst morphological structure. The result of XPS, O2-TPD and H2-TPR analysis indicates that the hydrothermal synthesis process is conducive to generating lattice defects (oxygen vacancies) of CeO2-ZrO2 solid solution. This is a key factor for enhancing the concentration of surface-active oxygen species. The CeO2-ZrO2 catalyst prepared by 48 h of hydrothermal processing time (CZ-48 h) exhibits the highest concentration of surface-active oxygen species and oxygen vacancies. Interestingly, the CeO2-ZrO2 catalyst synthesized by 6 h of hydrothermal processing time (CZ-6 h) exhibits oxygen vacancy and surface-active oxygen levels that are close to the CZ-48 h, which is obviously more than the traditional co-precipitation CeO2-ZrO2 catalyst (CZ-0 h). The soot catalytic elimination performance of the CZ-6 h is also significantly superior to that of the CZ-0 h catalyst. Therefore, this study suggests that the short-time hydrothermal processing is an effective and low-cost strategy to create more oxygen vacancies and improve catalytic performance of CeO2-ZrO2 solid solution. |
| format | Article |
| id | doaj-art-1d991c70f443449da0533cc3f51355c6 |
| institution | Matheson Library |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Fuel Processing Technology |
| spelling | doaj-art-1d991c70f443449da0533cc3f51355c62025-08-01T04:44:19ZengElsevierFuel Processing Technology0378-38202025-10-01276108294Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel sootZhengzheng Yang0Zhi Chen1Na Zhang2Yang Zhou3Dezhou Luo4Tai Jin5Huangwei Zhang6National University of Singapore Chongqing Research Institute, Chongqing 401123, China; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China; School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, ChinaCollege of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, ChinaCollege of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China; Sichuan Modern Vocational College, Chengdu 610207, China; Correspondence to: Na Zhang, Sichuan Modern Vocational College, Chengdu 610207, ChinaCollege of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, ChinaCollege of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, ChinaSchool of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China; Correspondence to: Tai Jin, School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, 310027, ChinaNational University of Singapore Chongqing Research Institute, Chongqing 401123, China; Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore; Correspondence to: Huangwei Zhang, National University of Singapore Chongqing Research Institute, Chongqing 401123, China.In this work, the physical-chemical and morphological evolution of CeO2-ZrO2 solid solutions caused by hydrothermal processing time, and its effects on catalytic diesel soot elimination were studied. SEM and TEM results show that the CeO2-ZrO2 nanocrystal particles gradually aggregate with the extension of hydrothermal processing time. A moderate hydrothermal processing time can facilitate the engineering of catalyst morphology at micronmeter scale, however, excessive hydrothermal synthesis time would contrarily destroy the micrometer scaled catalyst morphological structure. The result of XPS, O2-TPD and H2-TPR analysis indicates that the hydrothermal synthesis process is conducive to generating lattice defects (oxygen vacancies) of CeO2-ZrO2 solid solution. This is a key factor for enhancing the concentration of surface-active oxygen species. The CeO2-ZrO2 catalyst prepared by 48 h of hydrothermal processing time (CZ-48 h) exhibits the highest concentration of surface-active oxygen species and oxygen vacancies. Interestingly, the CeO2-ZrO2 catalyst synthesized by 6 h of hydrothermal processing time (CZ-6 h) exhibits oxygen vacancy and surface-active oxygen levels that are close to the CZ-48 h, which is obviously more than the traditional co-precipitation CeO2-ZrO2 catalyst (CZ-0 h). The soot catalytic elimination performance of the CZ-6 h is also significantly superior to that of the CZ-0 h catalyst. Therefore, this study suggests that the short-time hydrothermal processing is an effective and low-cost strategy to create more oxygen vacancies and improve catalytic performance of CeO2-ZrO2 solid solution.http://www.sciencedirect.com/science/article/pii/S0378382025001183CeO2-ZrO2 catalystReactive oxygen evolutionSoot oxidationDiesel exhaust purification |
| spellingShingle | Zhengzheng Yang Zhi Chen Na Zhang Yang Zhou Dezhou Luo Tai Jin Huangwei Zhang Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot Fuel Processing Technology CeO2-ZrO2 catalyst Reactive oxygen evolution Soot oxidation Diesel exhaust purification |
| title | Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot |
| title_full | Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot |
| title_fullStr | Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot |
| title_full_unstemmed | Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot |
| title_short | Time-dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria-zirconia solid solutions for catalytic combustion of diesel soot |
| title_sort | time dependent evolution of morphologies and lattice defects in hydrothermal synthesized ceria zirconia solid solutions for catalytic combustion of diesel soot |
| topic | CeO2-ZrO2 catalyst Reactive oxygen evolution Soot oxidation Diesel exhaust purification |
| url | http://www.sciencedirect.com/science/article/pii/S0378382025001183 |
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