Facilitating mechanisms of activity and SO2/H2O tolerance on ZrVOx catalysts for selective catalytic reduction of NOx removal with NH3

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2024-12-01 DOI:10.1016/j.cej.2024.158003

Ke Niu, Mingyu Guo, Qingling Liu, Caixia Liu, Jing Gao, Meng Xiao, Shaoping Cui, Boqun Liu, Yingjie Zhao, Guolong Zang

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引用次数: 0

Abstract

Sulfur oxides originated from high sulfur content in heavy fuel oil, which deleteriously impacting the catalysts during the NH₃-SCR under low temperatures conditions. In this study, a ZrVO_x catalyst with good low-temperature performance and resistance to SO₂/H₂O was synthesized via hydrothermal method for NH₃-SCR. With the introduction of SO₂ and H₂O at 230 °C, the NO_x conversion rate remained stable at 94 %. After characterization analysis, it was ascertained that the ZrVO_x catalyst possessed a finely porous structure, expansive specific surface area, and strong low-temperature redox capability. Simultaneously, SO₂ had minimal impact on the efficient adsorption of reactants., and deposited sulfate gradually decomposed with increasing temperature, mitigating the catalytic inhibition of SO₂. The addition of H₂O enhanced the concentration of surface active oxygen species (ROS) over the catalyst surface, increasing the surface hydroxyl groups and counteracted the negative impact of SO₂ poisoning. Moreover, the in situ DRIFTs results confirmed that the catalytic reactions on ZrVO_x primarily followed the Eley-Rideal (E-R) mechanism.

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.