利用锌渣制备的掺杂异质原子的氧化铁基催化剂用于高效选择性催化还原氮氧化物与 NH3

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Jiale Liang, Yaojun Zhang, Hao Chen, Licai Liu, Panyang He, Lei Wu
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引用次数: 0

摘要

烟气中氮氧化物的过量排放对环境造成了各种不利影响,因此迫切需要开发低成本、高性能的脱硝催化剂。氧化铁基材料一直被视为前景广阔的脱硝催化剂。然而,低温活性不理想限制了其实际应用。本研究采用酸处理锌渣的方法制备了一系列优良的低温脱硝催化剂(Ha-FeOx/yZS),并通过调节酸浓度来调节铁离子与杂质离子的质量比。Ha-FeOx/yZS在180-300 °C范围内具有较高的脱硝性能(90%),在250 °C时最佳的NO转化率和N2选择性均高于95%。其中,用 2 mol/L HNO3 合成的 Ha-FeOx/2ZS 具有最宽的温度窗口(175-350 ℃)。Ha-FeOx/yZS优异的脱硝性能主要归功于铁与杂质离子之间强烈的相互作用抑制了晶体的生长,使得Ha-FeOx/yZS具有非晶态结构,颗粒细小,比表面积大,表面酸位点多,化学吸附氧高。原位 DRIFT 实验证实,Ha-FeOx/yZS 上的 SCR 反应遵循 Langmuir-Hinshelwood (L-H) 机制和 Eley-Rideal (E-R) 机制。本研究提出了一种利用锌渣制备高性价比催化剂的高附加值方法,该方法在利用氨进行选择性催化还原去除氮氧化物方面具有广阔的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Heteroatoms doped iron oxide-based catalyst prepared from zinc slag for efficient selective catalytic reduction of NOx with NH3

Heteroatoms doped iron oxide-based catalyst prepared from zinc slag for efficient selective catalytic reduction of NOx with NH3

Excessive emissions of nitrogen oxides from flue gas have imposed various detrimental impacts on environment, and the development of deNOx catalysts with low-cost and high performance is an urgent requirement. Iron oxide-based material has been explored for promising deNOx catalysts. However, the unsatisfactory low-temperature activity limits their practical applications. In this study, a series of excellent low-temperature denitrification catalysts (Ha-FeOx/yZS) were prepared by acid treatment of zinc slag, and the mass ratios of Fe to impure ions was regulated by adjusting the acid concentrations. Ha-FeOx/yZS showed high denitrification performance (> 90%) in the range of 180–300 °C, and the optimal NO conversion and N2 selectivity were higher than 95% at 250 °C. Among them, the Ha-FeOx/2ZS synthesized with 2 mol/L HNO3 exhibited the widest temperature window (175–350 °C). The excellent denitrification performance of Ha-FeOx/yZS was mainly attributed to the strong interaction between Fe and impurity ions to inhibit the growth of crystals, making Ha-FeOx/yZS with amorphous structure, nice fine particles, large specific surface area, more surface acid sites and high chemisorbed oxygen. The in-situ DRIFT experiments confirmed that the SCR reaction on the Ha-FeOx/yZS followed both Langmuir-Hinshelwood (L-H) mechanism and Eley-Rideal (E-R) mechanism. The present work proposed a high value-added method for the preparation of cost-effective catalysts from zinc slag, which showed a promising application prospect in NOx removal by selective catalytic reduction with ammonia.

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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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