一种新型的锰/钛复合光催化剂用于去除单质汞和一氧化氮

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-03-07 DOI:10.1016/j.jtice.2025.106055

Ting-Yu Chen, Ji-Ren Zheng, Chung-Shin Yuan, Ching-Ching Hsu

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引用次数: 0

摘要

同时从烟气排放中去除单质汞（Hg0）和一氧化氮（NO）对于减少燃煤电厂的空气污染物排放至关重要。mno2和TiO2光催化剂因其在低温下易于氧化而受到人们的关注。然而，催化剂组成、烟气成分和操作条件对光催化性能的影响仍然不够清楚，限制了它们在工业应用中的优化。方法合成不同Mn/Ti比的smno2 /TiO2光催化剂，并利用表面特征评价其结构和光学性能。考虑到SO2和NO浓度的影响，在100-200℃近紫外光下进行了Hg0和NO的催化氧化试验。具有最佳Ti/Mn比的催化剂表现出较高的去除率，Hg0和NO去除率高达98.7%。与TiO2相比，MnO2抑制了电子-空穴复合，增强了光吸收，并表现出较高的抗硫能力。结果表明，MnO2在去除Hg0和NO方面优于各种Mn/Ti双复合材料。对于杂质气体，SO2对Hg0氧化有抑制作用，而NO对Hg0氧化有促进作用。当[NH3]/[NO]摩尔比为1.25时，NO去除率最高。这些发现突出了Ti/Mn双复合催化剂在工业烟气处理中同时去除Hg0和NO的潜力。

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An innovative composite Mn/Ti photocatalysts developed for the removal of elemental mercury and nitric oxide

Background

The simultaneous removal of elemental mercury (Hg⁰) and nitric oxide (NO) from flue gas emissions is crucial for reducing air pollutant emissions from coal-fired power plants. MnO₂ and TiO₂ photocatalysts have attracted attention due to their ability to facilitate in oxidation at low temperatures. However, the effects of catalyst composition, flue gas components, and operating conditions on photocatalytic performance remains insufficiently understood, limiting their optimization for industrial applications.

Methods

MnO₂/TiO₂ photocatalysts with varying Mn/Ti ratios were synthesized, and their surface characteristics were used to assess structural and optical properties. Catalytic oxidation tests for Hg⁰ and NO were performed under near-UV light at 100–200°C, considering the effects of SO₂ and NO concentrations.

Significant findings

Catalysts with optimal Ti/Mn ratios demonstrated high removal efficiencies, with Hg⁰ and NO removal reaching up to 98.7%. Outperforming TiO₂, MnO₂ inhibited electron-hole recombination, enhanced light absorption, and exhibited high sulfur resistance capability. It demonstrated that MnO₂ outperformed various Mn/Ti dual composites for removing Hg⁰ and NO. For impurity gases, SO₂ inhibited Hg⁰ oxidation, while NO showed a beneficial effect. The highest NO removal was observed at an [NH₃]/[NO] molar ratio of 1.25. These findings highlight the potential of Ti/Mn dual composite catalysts’ potential for simultaneous Hg⁰ and NO removal in industrial flue gas treatment.

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.