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

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

Abstract

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.