dc.creator | Yang, Guangpeng | |
dc.creator | Du, Xuesen | |
dc.creator | Ran, Jingyu | |
dc.creator | Wang, Xiangmin | |
dc.creator | Chen, Yanrong | |
dc.creator | Zhang, Li | |
dc.creator | Rac, Vladislav | |
dc.creator | Rakić, Vesna | |
dc.creator | Crittenden, John | |
dc.date.accessioned | 2020-12-17T22:54:58Z | |
dc.date.available | 2020-12-17T22:54:58Z | |
dc.date.issued | 2020 | |
dc.identifier.issn | 0304-3894 | |
dc.identifier.uri | http://aspace.agrif.bg.ac.rs/handle/123456789/5346 | |
dc.description.abstract | SCR activity of Cu-SAPO-34 catalyst was reduced by alkali metal ions. The alkali metals ions (Li+, Na+ and K+) have shown irregular influences on Cu-SAPO-34. The order of poisoning strengths under 400 degrees C was found to be: Na+ > K+ Li+, which is not consistent with the basicities of their corresponding metals. Experimental results and calculations showed that the alkali metal ions readily replace H+ and Cu2+/Cu3+ ions. These exchanges result in the loss of Bronsted acid sites and migration of isolated Cu2+ ions in Cu-SAPO-34, which decrease the NH3-SCR activity. Both the basicity and ion diameter will affect the exchanging behavior of an alkali ion. Na+ and Li+ ions will influence both H+ and Cu2+/Cu+ ions but K+ ions only preferably replace the H+ We hypothesize that K+ cannot enter into a small ring (6-membered ring) to replace a Cu2+/Cu+ ion because of its large ion diameter. The displaced Cu2+/Cu+ ions will transfer to adjacent unbonded Al site to form a CuAlO2 species. | en |
dc.publisher | Elsevier, Amsterdam | |
dc.relation | National Natural Science Foundation of China (NSFC) [51506015] | |
dc.relation | Chongqing Technology Innovation and Application Demonstration Projects [cstc2018jscx-msyb0999] | |
dc.relation | Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [2018CDQYDL0050, 2018CDJDDL0004] | |
dc.relation | Open Fund of Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of China [LLEUTS-2019002] | |
dc.relation | Brook Byers Institute for Sustainable Systems, Hightower Chair and Georgia Research Alliance at the Georgia Institute of Technology | |
dc.rights | restrictedAccess | |
dc.source | Journal of Hazardous Materials | |
dc.subject | Cu-SAPO-34 | en |
dc.subject | Alkali metal | en |
dc.subject | Migration | en |
dc.subject | Cu species | en |
dc.title | Irregular influence of alkali metals on Cu-SAPO-34 catalyst for selective catalytic reduction of NOx with ammonia | en |
dc.type | article | |
dc.rights.license | ARR | |
dc.citation.other | 387: - | |
dc.citation.rank | aM21 | |
dc.citation.volume | 387 | |
dc.identifier.doi | 10.1016/j.jhazmat.2019.122007 | |
dc.identifier.scopus | 2-s2.0-85078692506 | |
dc.identifier.pmid | 31901842 | |
dc.identifier.wos | 000514758500014 | |
dc.type.version | publishedVersion | |