{"title":"增强 CuO/SiO2-TiO2 催化剂的活性和耐水性，促进 CO 氧化和 CO 还原 NO：SiO2 的促进作用","authors":"","doi":"10.1007/s11244-024-01917-9","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>Non-precious metal catalysts with enhanced low-temperature activity and improved water resistance are highly demanded for emission control. CuO-based catalysts are promising alternatives to precious metal catalysts due to their acceptable activity and cost-effectiveness. However, there is an urgent need to further enhance their low-temperature activity and water resistance for industrial applications. Herein, CuO catalysts supported by various SiO<sub>2</sub>-TiO<sub>2</sub> supports were prepared and evaluated for CO oxidation and NO reduction by CO reactions under the testing conditions with and without water. Among the studied catalysts with different SiO<sub>2</sub> contents, CuO/5SiO<sub>2</sub>-TiO<sub>2</sub>, in which CuO was supported by SiO<sub>2</sub>-TiO<sub>2</sub> with 5 wt.% SiO<sub>2</sub>, exhibited the best performance for CO oxidation. Compared with CuO/TiO<sub>2</sub> and CuO/SiO<sub>2</sub> reference catalysts, the CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst showed enhanced catalytic activity in both CO oxidation and NO reduction by CO under dry and wet conditions. Comprehensive characterizations revealed that the presence of SiO<sub>2</sub> in TiO<sub>2</sub> support facilitated the CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst with a high dispersion and reduced oxidation states of CuO<sub><em>x</em></sub> species. This not only improved the low-temperature reducibility but also enhanced the adsorption of reactive CO species. As a result, the CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst demonstrated superior catalytic activity. Furthermore, the inclusion of SiO<sub>2</sub> in the catalyst inhibited H<sub>2</sub>O adsorption, contributing to the enhanced water resistance on CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst. These advantages in catalytic activity and water resistance make CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> a promising candidate for applications in emission control.</p>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"232 1","pages":""},"PeriodicalIF":2.8000,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced Activity and Water Resistance on CuO/SiO2-TiO2 Catalyst for CO Oxidation and NO Reduction by CO: The Promotion Effect of SiO2\",\"authors\":\"\",\"doi\":\"10.1007/s11244-024-01917-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3>Abstract</h3> <p>Non-precious metal catalysts with enhanced low-temperature activity and improved water resistance are highly demanded for emission control. CuO-based catalysts are promising alternatives to precious metal catalysts due to their acceptable activity and cost-effectiveness. However, there is an urgent need to further enhance their low-temperature activity and water resistance for industrial applications. Herein, CuO catalysts supported by various SiO<sub>2</sub>-TiO<sub>2</sub> supports were prepared and evaluated for CO oxidation and NO reduction by CO reactions under the testing conditions with and without water. Among the studied catalysts with different SiO<sub>2</sub> contents, CuO/5SiO<sub>2</sub>-TiO<sub>2</sub>, in which CuO was supported by SiO<sub>2</sub>-TiO<sub>2</sub> with 5 wt.% SiO<sub>2</sub>, exhibited the best performance for CO oxidation. Compared with CuO/TiO<sub>2</sub> and CuO/SiO<sub>2</sub> reference catalysts, the CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst showed enhanced catalytic activity in both CO oxidation and NO reduction by CO under dry and wet conditions. Comprehensive characterizations revealed that the presence of SiO<sub>2</sub> in TiO<sub>2</sub> support facilitated the CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst with a high dispersion and reduced oxidation states of CuO<sub><em>x</em></sub> species. This not only improved the low-temperature reducibility but also enhanced the adsorption of reactive CO species. As a result, the CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst demonstrated superior catalytic activity. Furthermore, the inclusion of SiO<sub>2</sub> in the catalyst inhibited H<sub>2</sub>O adsorption, contributing to the enhanced water resistance on CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> catalyst. These advantages in catalytic activity and water resistance make CuO/5SiO<sub>2</sub>-TiO<sub>2</sub> a promising candidate for applications in emission control.</p>\",\"PeriodicalId\":801,\"journal\":{\"name\":\"Topics in Catalysis\",\"volume\":\"232 1\",\"pages\":\"\"},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-02-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Topics in Catalysis\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1007/s11244-024-01917-9\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Topics in Catalysis","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1007/s11244-024-01917-9","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
摘要
摘要 排放控制领域对低温活性更强、耐水性更好的非贵金属催化剂的需求量很大。氧化铜基催化剂具有可接受的活性和成本效益，是贵金属催化剂的有前途的替代品。然而，工业应用迫切需要进一步提高其低温活性和耐水性。本文制备了由不同二氧化硅-二氧化钛（SiO2-TiO2）载体支撑的氧化铜催化剂，并对其在有水和无水试验条件下通过 CO 反应氧化 CO 和还原 NO 的性能进行了评估。在所研究的不同 SiO2 含量的催化剂中，CuO 被含 5 wt.% SiO2 的 SiO2-TiO2 支持的 CuO/5SiO2-TiO2 的 CO 氧化性能最好。与 CuO/TiO2 和 CuO/SiO2 参考催化剂相比，CuO/5SiO2-TiO2 催化剂在干法和湿法条件下 CO 氧化和 CO 还原 NO 的催化活性都有所提高。综合表征结果表明，TiO2 载体中 SiO2 的存在促进了 CuO/5SiO2-TiO2 催化剂的高度分散，并降低了 CuOx 物种的氧化态。这不仅提高了低温还原性，还增强了对活性 CO 物种的吸附。因此，CuO/5SiO2-TiO2 催化剂表现出更高的催化活性。此外，催化剂中 SiO2 的加入抑制了 H2O 的吸附，从而增强了 CuO/5SiO2-TiO2 催化剂的耐水性。CuO/5SiO2-TiO2 催化剂在催化活性和耐水性方面的这些优势使其在排放控制领域的应用前景广阔。
Enhanced Activity and Water Resistance on CuO/SiO2-TiO2 Catalyst for CO Oxidation and NO Reduction by CO: The Promotion Effect of SiO2
Abstract
Non-precious metal catalysts with enhanced low-temperature activity and improved water resistance are highly demanded for emission control. CuO-based catalysts are promising alternatives to precious metal catalysts due to their acceptable activity and cost-effectiveness. However, there is an urgent need to further enhance their low-temperature activity and water resistance for industrial applications. Herein, CuO catalysts supported by various SiO2-TiO2 supports were prepared and evaluated for CO oxidation and NO reduction by CO reactions under the testing conditions with and without water. Among the studied catalysts with different SiO2 contents, CuO/5SiO2-TiO2, in which CuO was supported by SiO2-TiO2 with 5 wt.% SiO2, exhibited the best performance for CO oxidation. Compared with CuO/TiO2 and CuO/SiO2 reference catalysts, the CuO/5SiO2-TiO2 catalyst showed enhanced catalytic activity in both CO oxidation and NO reduction by CO under dry and wet conditions. Comprehensive characterizations revealed that the presence of SiO2 in TiO2 support facilitated the CuO/5SiO2-TiO2 catalyst with a high dispersion and reduced oxidation states of CuOx species. This not only improved the low-temperature reducibility but also enhanced the adsorption of reactive CO species. As a result, the CuO/5SiO2-TiO2 catalyst demonstrated superior catalytic activity. Furthermore, the inclusion of SiO2 in the catalyst inhibited H2O adsorption, contributing to the enhanced water resistance on CuO/5SiO2-TiO2 catalyst. These advantages in catalytic activity and water resistance make CuO/5SiO2-TiO2 a promising candidate for applications in emission control.
期刊介绍：
Topics in Catalysis publishes topical collections in all fields of catalysis which are composed only of invited articles from leading authors. The journal documents today’s emerging and critical trends in all branches of catalysis. Each themed issue is organized by renowned Guest Editors in collaboration with the Editors-in-Chief. Proposals for new topics are welcome and should be submitted directly to the Editors-in-Chief.
The publication of individual uninvited original research articles can be sent to our sister journal Catalysis Letters. This journal aims for rapid publication of high-impact original research articles in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
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