{"title":"LaCoO3 是一种很有前途的催化剂,可用于作为生物质焦油替代物的苯的干转化。","authors":"Başar Çağlar, Deniz Üner","doi":"10.55730/1300-0527.3685","DOIUrl":null,"url":null,"abstract":"<p><p>Tar build-up is one of the bottlenecks of biomass gasification processes. Dry reforming of tar is an alternative solution if the oxygen chemical potential on the catalyst surface is at a sufficient level. For this purpose, an oxygen-donor perovskite, LaCoO<sub>3</sub>, was used as a catalyst for the dry reforming of tar. To circumvent the complexity of the tar and its constituents, the benzene molecule was chosen as a model compound. Dry reforming of benzene vapor on the LaCoO<sub>3</sub> catalyst was investigated at temperatures of 600, 700, and 800 °C; at CO<sub>2</sub>/C<sub>6</sub>H<sub>6</sub> ratios of 3, 6, and 12; and at space velocities of 14,000 and 28,000 h<sup>-1</sup>. The conventional Ni(15 wt.%)/Al<sub>2</sub>O<sub>3</sub> catalyst was also used as a reference material to determine the relative activity of the LaCoO<sub>3</sub> catalyst. Different characterization techniques such as X-ray diffraction, N<sub>2</sub> adsorption-desorption, temperature-programmed reduction, and oxidation were used to determine the physicochemical characteristics of the catalysts. The findings demonstrated that the LaCoO<sub>3</sub> catalyst has higher CO<sub>2</sub> conversion, higher H<sub>2</sub> and CO yields, and better stability than the Ni(15 wt.%)/γ-Al<sub>2</sub>O<sub>3</sub> catalyst. The improvement in activity was attributed to the strong capacity of LaCoO<sub>3</sub> for oxygen exchange. The transfer of lattice oxygen from the surface of the LaCoO<sub>3</sub> catalyst facilitates the oxidation of carbon and other surface species and leads to higher conversion and yields.</p>","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 4","pages":"643-658"},"PeriodicalIF":1.3000,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11407365/pdf/","citationCount":"0","resultStr":"{\"title\":\"LaCoO<sub>3</sub> is a promising catalyst for the dry reforming of benzene used as a surrogate of biomass tar.\",\"authors\":\"Başar Çağlar, Deniz Üner\",\"doi\":\"10.55730/1300-0527.3685\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Tar build-up is one of the bottlenecks of biomass gasification processes. Dry reforming of tar is an alternative solution if the oxygen chemical potential on the catalyst surface is at a sufficient level. For this purpose, an oxygen-donor perovskite, LaCoO<sub>3</sub>, was used as a catalyst for the dry reforming of tar. To circumvent the complexity of the tar and its constituents, the benzene molecule was chosen as a model compound. Dry reforming of benzene vapor on the LaCoO<sub>3</sub> catalyst was investigated at temperatures of 600, 700, and 800 °C; at CO<sub>2</sub>/C<sub>6</sub>H<sub>6</sub> ratios of 3, 6, and 12; and at space velocities of 14,000 and 28,000 h<sup>-1</sup>. The conventional Ni(15 wt.%)/Al<sub>2</sub>O<sub>3</sub> catalyst was also used as a reference material to determine the relative activity of the LaCoO<sub>3</sub> catalyst. Different characterization techniques such as X-ray diffraction, N<sub>2</sub> adsorption-desorption, temperature-programmed reduction, and oxidation were used to determine the physicochemical characteristics of the catalysts. The findings demonstrated that the LaCoO<sub>3</sub> catalyst has higher CO<sub>2</sub> conversion, higher H<sub>2</sub> and CO yields, and better stability than the Ni(15 wt.%)/γ-Al<sub>2</sub>O<sub>3</sub> catalyst. The improvement in activity was attributed to the strong capacity of LaCoO<sub>3</sub> for oxygen exchange. The transfer of lattice oxygen from the surface of the LaCoO<sub>3</sub> catalyst facilitates the oxidation of carbon and other surface species and leads to higher conversion and yields.</p>\",\"PeriodicalId\":23367,\"journal\":{\"name\":\"Turkish Journal of Chemistry\",\"volume\":\"48 4\",\"pages\":\"643-658\"},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2024-06-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11407365/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Turkish Journal of Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.55730/1300-0527.3685\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2024/1/1 0:00:00\",\"PubModel\":\"eCollection\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Turkish Journal of Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.55730/1300-0527.3685","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/1/1 0:00:00","PubModel":"eCollection","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
LaCoO3 is a promising catalyst for the dry reforming of benzene used as a surrogate of biomass tar.
Tar build-up is one of the bottlenecks of biomass gasification processes. Dry reforming of tar is an alternative solution if the oxygen chemical potential on the catalyst surface is at a sufficient level. For this purpose, an oxygen-donor perovskite, LaCoO3, was used as a catalyst for the dry reforming of tar. To circumvent the complexity of the tar and its constituents, the benzene molecule was chosen as a model compound. Dry reforming of benzene vapor on the LaCoO3 catalyst was investigated at temperatures of 600, 700, and 800 °C; at CO2/C6H6 ratios of 3, 6, and 12; and at space velocities of 14,000 and 28,000 h-1. The conventional Ni(15 wt.%)/Al2O3 catalyst was also used as a reference material to determine the relative activity of the LaCoO3 catalyst. Different characterization techniques such as X-ray diffraction, N2 adsorption-desorption, temperature-programmed reduction, and oxidation were used to determine the physicochemical characteristics of the catalysts. The findings demonstrated that the LaCoO3 catalyst has higher CO2 conversion, higher H2 and CO yields, and better stability than the Ni(15 wt.%)/γ-Al2O3 catalyst. The improvement in activity was attributed to the strong capacity of LaCoO3 for oxygen exchange. The transfer of lattice oxygen from the surface of the LaCoO3 catalyst facilitates the oxidation of carbon and other surface species and leads to higher conversion and yields.
期刊介绍:
The Turkish Journal of Chemistry is a bimonthly multidisciplinary journal published by the Scientific and Technological Research Council of Turkey (TÜBİTAK).
The journal is dedicated to dissemination of knowledge in all disciplines of chemistry (organic, inorganic, physical, polymeric, technical, theoretical and analytical chemistry) as well as research at the interface with other sciences especially in chemical engineering where molecular aspects are key to the findings.
The journal accepts English-language original manuscripts and contribution is open to researchers of all nationalities.
The journal publishes refereed original papers, reviews, letters to editor and issues devoted to special fields.
All manuscripts are peer-reviewed and electronic processing ensures accurate reproduction of text and data, plus publication times as short as possible.