文献类型：期刊文献

英文题名：Adsorptive purification of NOx by HZSM-5 zeolites: Effects of Si/Al ratio, temperature, humidity, and gas composition

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

第一作者：Liu, Yingshu

通讯作者：Yang, X[1];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：348

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20225213292119);Scopus(收录号：2-s2.0-85144411371);WOS:【SCI-EXPANDED(收录号:WOS:000975028900001)】；

基金：The authors would like to express the gratitude to the National Key R & D Program of China (No. 2020YFC1512302) , Science and Technology Program of Guizhou Province (No. QKHCZ [2021] 497) , the Fundamental Research Funds for the Central Universities (No. FRF-IDRY- GD21-02) , and the Beijing Municipal Education Commission (No. KM202011417007) .

语种：英文

外文关键词：Flue gas purification; Nitrogen oxides; Zeolite; Adsorption; Water vapor

摘要：Adsorption is a promising technology for capturing nitrogen oxides (NOx) from humid flue gases, for which as the preferred NOx adsorbent, zeolite with an appropriate silica to alumina (Si/Al) ratio provides the key step for success in practical applications. In this work, the effects of Si/Al ratio, temperature, relative humidity (RH), and feed gas (NOx-H2O(g)-CO2-O2-N2) compositions on NOx sorption behavior on HZSM-5 zeolites were systemat-ically investigated, based on a series of characterizations, fixed-bed adsorption and temperature programmed desorption (TPD) tests. The low-silica HZSM-5(25) showed the best performance (326.6 mu mol/g and 39.2 mu mol/g at dry and 90%RH) as compared to others with higher Si/Al ratios at each RH, in which the roll-up effect was positively correlated with the Si/Al ratios and humidity. O2 enhanced NOx adsorption and reached an optimal adsorption capacity at the concentration of 14%, while CO2 had little effect on NOx adsorption. The decrease in temperature increased NOx adsorption capacity on HZSM-5(25), benefitting from NO2 physisorption as well as satisfactory NO oxidation within the active adsorbent structure. The facile thermal desorption of NOx and sig-nificant NO-NO2 conversion on HZSM-5(25) was exhibited by bimodal TPD peaks at 343-353K and 533-543K respective for NO and NO2, in contrast to those on Silicalite-1. A potential "water-resistant" strategy via the enhancement of NOx adsorption competitiveness was revealed, providing a theoretical guideline for NOx adsorbent screening in industrial applications.