VOCs (toluene) removal from iron ore sintering flue gas via LaBO3 (B = Cu, Fe, Cr, Mn, Co) perovskite catalysts: experiment and mechanism

IF 1.6 4区 工程技术 Q3 Chemical Engineering
Long Ding, Hexi Zhao, Yafei Li, Yi-fan Wang, Hongming Long
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Abstract

The challenges posed by volatile organic compound (VOC) emissions in iron ore sintering flue gas are significant. La-based perovskite catalysts offer a promising solution for efficiently degrading VOCs. In this study, a series of LaBO3 (B = Cu, Fe, Cr, Mn, Co) perovskite catalysts were synthesized using the sol-gel method. The influence of various B-site elements on the catalyst’s structure and surface chemical properties was thoroughly examined. Simulations were conducted to assess the VOC reduction capabilities of these catalysts under conditions mimicking sintering flue gas composition. It was found that the crystallite size of the perovskite catalyst decreases as the ionic radius of the B-site elements increases, while the specific surface area, total pore volume, and average pore size increase correspondingly. Notably, LaCoO3 and LaMnO3 demonstrated exceptional activity, attributed primarily to their elevated surface oxygen concentration and oxygen migration capability, positioning them as highly promising materials for further development. Furthermore, a proposed mechanism elucidates the La-based perovskite catalytic reduction of toluene, wherein lattice oxygen and adsorbed oxygen undergo mutual conversion during the oxidation process. This mechanism aligns with the L-H and M-v-K models, providing a comprehensive understanding of the catalytic process.
通过 LaBO3(B = 铜、铁、铬、锰、钴)包晶催化剂去除铁矿烧结烟气中的挥发性有机化合物(甲苯):实验与机理
铁矿烧结烟气中的挥发性有机化合物(VOC)排放带来了巨大挑战。La 基包晶催化剂为有效降解挥发性有机化合物提供了一种前景广阔的解决方案。本研究采用溶胶-凝胶法合成了一系列 LaBO3(B = Cu、Fe、Cr、Mn、Co)包晶催化剂。研究深入考察了各种 B 位元素对催化剂结构和表面化学性质的影响。在模拟烧结烟气成分的条件下,对这些催化剂的挥发性有机化合物还原能力进行了模拟评估。研究发现,随着 B 位元素离子半径的增大,过氧化物催化剂的结晶尺寸减小,而比表面积、总孔体积和平均孔尺寸则相应增大。值得注意的是,LaCoO3 和 LaMnO3 表现出了优异的活性,这主要归功于它们较高的表面氧浓度和氧迁移能力,使它们成为极有潜力进一步开发的材料。此外,还提出了一种机制,阐明了 La 基包晶石催化还原甲苯的机制,其中晶格氧和吸附氧在氧化过程中发生了相互转化。该机理与 L-H 和 M-v-K 模型相吻合,为催化过程提供了全面的理解。
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来源期刊
CiteScore
2.80
自引率
12.50%
发文量
107
审稿时长
3 months
期刊介绍: The International Journal of Chemical Reactor Engineering covers the broad fields of theoretical and applied reactor engineering. The IJCRE covers topics drawn from the substantial areas of overlap between catalysis, reaction and reactor engineering. The journal is presently edited by Hugo de Lasa and Charles Xu, counting with an impressive list of Editorial Board leading specialists in chemical reactor engineering. Authors include notable international professors and R&D industry leaders.
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