Boosting the Alkali/Heavy Metal Poisoning Resistance for NO Removal by Using Iron-Titanium Pillared Montmorillonite Catalysts

Dong Xu; Wenhao Wu; Penglu Wang; Jiang Deng; Tingting Yan; Dengsong Zhang

doi:10.1016/j.jhazmat.2020.122947

Boosting the Alkali/Heavy Metal Poisoning Resistance for NO Removal by Using Iron-Titanium Pillared Montmorillonite Catalysts

J Hazard Mater. 2020 Nov 15:399:122947. doi: 10.1016/j.jhazmat.2020.122947. Epub 2020 May 21.

Authors

Dong Xu¹, Wenhao Wu², Penglu Wang³, Jiang Deng⁴, Tingting Yan⁴, Dengsong Zhang⁵

Affiliations

¹ Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education, Anhui University of Technology, Ma'anshan, 243002, China.
² Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education, Anhui University of Technology, Ma'anshan, 243002, China; Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China.
³ Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China. Electronic address: plwang@shu.edu.cn.
⁴ Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China.
⁵ Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China. Electronic address: dszhang@shu.edu.cn.

PMID: 32521318
DOI: 10.1016/j.jhazmat.2020.122947

Abstract

It is still a big challge to improve the alkali and heavy metal resistance of deNO_x catalysts for selective catalytic reduction (SCR) of NO_x with NH₃. In this study, a novel catalyst developed by pillaring montmorillonite with iron and titanium (Fe-Ti-MMT) was proposed. It is quite interesting that high resistance to alkaline and heavy metals has been demonstrated by using Fe-Ti-MMT catalysts. It has been demonstrated that the specific pillaring synthesis procedure and further addition of the Ti pillared sites greatly contributed to the wide active temperature window and enhanced the resistance to alkali and heavy metal. The higher ratio of active Fe²⁺ species, more active acid sites, and enhanced ammonia adsorption indicated the remarkable activity as well as K and Pb resistance. Moreover, the K and Pb poisons would promote the generation of active adsorbed NO_x species on the Fe-Ti-MMT but induce the formation of stable inactive ones on that of Fe-MMT, which greatly tuned the reaction pathways and improved the reaction rate for Ti modified Fe pillared MMT catalysts. The strategy of incorporating Ti into the Fe pillared MMT catalysts strongly provides a novel inspiration for keeping excellent NH₃-SCR performance in the presence of alkali/heavy metal for NO_x removal.

Keywords: Alkali resistance; Heavy metal resistance; NO(x) removal; Selective catalytic reduction.

Publication types

Research Support, Non-U.S. Gov't