文献类型：期刊文献

英文题名：Oxidative adsorption mechanism-based screening of zeolites for deep purification and recycling of NOx from humid gases

作者：Tao, Haiyang[1];Liu, Yingshu[1];Li, Jinjuan[2];Zhang, Chuanzhao[3];Zhao, Chunyu[1];Yang, Xiong[1];Yang, Ralph T.[4];Li, Ziyi[1]

第一作者：Tao, Haiyang

通讯作者：Li, ZY[1]

机构：[1]Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Beijing 100083, Peoples R China;[2]Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China;[3]Beijing Union Univ, Coll Biochem Engn, Beijing 100023, Peoples R China;[4]Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA

第一机构：Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Beijing 100083, Peoples R China

通讯机构：[1]corresponding author), Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Beijing 100083, Peoples R China.

年份：2023

卷号：475

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20234014825218);Scopus(收录号：2-s2.0-85172766240);WOS:【SCI-EXPANDED(收录号:WOS:001086141200001)】；

基金：The authors would like to express the gratitude to the National Natural Science Foundation of China (No. 52370107) , the Beijing Natural Science Foundation (No. L233015) , the Fundamental Research Funds for the Central Universities (No. FRF-IDRYGD21-02) , the Science and Technology Program of Guizhou Province (No. QKHCZ [2021] 497) , and the Beijing Municipal Education Commission (No. KM202011417007) .

语种：英文

外文关键词：Flue gas purification; Nitrogen oxides; Zeolites; Oxidative adsorption; Desorption

摘要：Adsorption is a promising technology for deep purification of nitrogen oxides (NOx) from flue gases and simultaneously recycling NO2 as an economically valuable chemical. Zeolite as a robust NOx adsorbent provides the key step for success in practical applications, of which the screening remains challenging regarding the NO-NO2 oxidation and adsorption combined process. In this work, experimental evaluations on practical NOx sorption performances on series of zeolites were conducted. Effects of the zeolite typological structure, compensating cation, and SiO2/Al2O3 ratio on deep purification efficacy, water resistance, and regenerability at varying humidity were obtained, revealing the importance of kinetics of the NO oxidation and NO2 physisorption consecutive process. The H-typed 10-membered-ring straight-channel zeolites (MFI and FER) were demonstrated to be the preferred NOx adsorbents qualified for industrial needs, as compared to other caged-channel, hybrid-channel, larger-sized straight-channel, or Na-typed counterparts. Deeper insights into the key role of Br & oslash;nsted acid sites (BAS) in driving the NO-NO2 catalytic cycle and promoting the adsorption competitiveness of NOx over water vapor were revealed based on in-situ diffuse reflectance Fourier transform infrared spectroscopy characterizations. The MFI zeolite with improved performance at the low-silica version could benefit from the efficient utilization of BAS within the highly accessible medium-sized straight channel, while the FAU zeolite (representative caged-channel zeolite) requiring appropriate SiO2/Al2O3 ratio for optimal BAS utilization may suffer from the limited site accessibility. The findings clarify the relationships between NOx oxidative adsorption performances and zeolite properties, which provides a fundamental perspective and scientific screening strategy for NOx adsorbents.