Shielding ceria based catalysts from SO2 poisoning in NH3-SCR reaction: Modification effect of acid metal oxides

IF 19.7 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2024-03-01 Epub Date: 2023-10-23 DOI:10.1016/j.apcatb.2023.123424

Yandi Cai , Bifeng Zhang , Haowei Yu , Xiaoyu Ji , Jingfang Sun , Xizhang Wang , Qiuhui Qian , Lulu Li , Annai Liu , Wei Tan , Fei Gao , Lin Dong

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引用次数: 0

Abstract

Modifying CeO₂ with acid sites is a common strategy for designing efficient catalysts for the selective catalytic reduction of NO_x by NH₃ (NH₃-SCR of NO_x). However, the effect of acid metal oxide modification on the SO₂ resistance of CeO₂ has not been well revealed. In this work, it was found that the SO₂ resistance of CeO₂ modified with several acid metal oxides (i.e., MoO₃, WO₃ and Nb₂O₅), followed an order of Mo/CeO₂ ≥ W/CeO₂ > Nb/CeO₂. Further systematic characterizations revealed that Mo-OH and W-OH on CeO₂ as Brønsted acid sites could better inhibit the SO₂ adsorption and the sulfation of active sites than highly dispersed NbO_x mainly as Lewis acid sites because NH₄⁺ coordinated to Brønsted acid sites could help trap SO₂ to form ammonium sulfates rather than metal sulfates. The findings in this work provided important guidance for the design of efficient catalysts with superior SO₂ resistance performance.

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屏蔽NH3-SCR反应中SO2中毒的铈基催化剂:酸性金属氧化物的改性效果

用酸位修饰CeO2是设计NH3选择性催化还原NOx (NH3- scr of NOx)的有效催化剂的常用策略。然而，酸性金属氧化物改性对CeO2耐SO2性能的影响尚未得到很好的研究。研究发现，用几种酸性金属氧化物(MoO3、WO3和Nb2O5)改性的CeO2的抗SO2性能依次为Mo/CeO2≥W/CeO2 >Nb / CeO2。进一步的系统表征表明，与高度分散的NbOx(主要是Lewis酸位)相比，CeO2上的Mo-OH和W-OH作为Brønsted酸位能更好地抑制SO2的吸附和硫酸化，这是因为NH4+配位在Brønsted酸位上有助于捕获SO2形成硫酸铵而不是金属硫酸盐。研究结果对设计抗SO2性能优良的高效催化剂具有重要的指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.