Full spectrum driven SCR removal of NO over hierarchical CeVO4/attapulgite nanocomposite with high resistance to SO2 and H2O

Xiazhang Li; Zhendong Wang; Haiyang Shi; Da Dai; Shixiang Zuo; Chao Yao; Chaoying Ni

doi:10.1016/j.jhazmat.2019.121977

Full spectrum driven SCR removal of NO over hierarchical CeVO₄/attapulgite nanocomposite with high resistance to SO₂ and H₂O

J Hazard Mater. 2020 Mar 15:386:121977. doi: 10.1016/j.jhazmat.2019.121977. Epub 2019 Dec 26.

Authors

Xiazhang Li¹, Zhendong Wang², Haiyang Shi², Da Dai², Shixiang Zuo², Chao Yao², Chaoying Ni³

Affiliations

¹ Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China; Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA; Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, 243002 Maanshan, PR China. Electronic address: xiazhang@cczu.edu.cn.
² Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China.
³ Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA. Electronic address: cni@udel.edu.

PMID: 31911381
DOI: 10.1016/j.jhazmat.2019.121977

Abstract

Removal of hazardous NO at low temperature via photo-assisted selective catalytic reduction (photo-SCR) strategy is promising, however fully harvesting of solar energy and achieving high SO₂/H₂O tolerance still remain a challenge. Herein, the phosphoric acid modified natural attapulgite(P-ATP) was employed as a matrix to immobilize CeVO₄ by microwave hydrothermal method. Results show that P-ATP provides abundant active sites facilitating the in situ grow of CeVO₄ nanorods on its surface which hierarchically construct a dendritic-like photocatalyst. The near-infrared (NIR) light is upconverted to visible and UV light through CeVO₄ which not only broaden the absorption range of solar light, but also build Z-scheme heterostructure with P-ATP enhancing the redox potential of charge carriers. The CeVO₄/P-ATP nanocomposite can reach as high as 92 % for NO conversion under full-spectrum solar irradiation, while retaining nearly 60 % conversion under NIR light. Moreover, the catalyst exhibits outstanding tolerance with SO₂ and H₂O due to the presence of Ce species which can prevent NH₃ from being sulfated, while ATP prevent catalyst from being corroded by H₂O. This work may open up a new window for full-spectrum driven SCR of NO based on cost-effective mineral catalyst.

Keywords: Attapulgite; CeVO(4); NO removal; Photo-SCR; Upconversion.

Publication types

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