Promotion of H3PW12O40 Grafting on NOx Abatement over γ-Fe2O3: Performance and Reaction Mechanism,Industrial & Engineering Chemistry Research

当前位置： X-MOL 学术 › Ind. Eng. Chem. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Promotion of H3PW12O40 Grafting on NOx Abatement over γ-Fe2O3: Performance and Reaction Mechanism
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-10-02 , DOI: 10.1021/acs.iecr.8b03087
Yang Geng _{1,

2} , Shangchao Xiong ₃ , Bo Li ₂ , Yue Peng ₃ , Shijian Yang ₁

Affiliation

In this study, γ-Fe₂O₃ was grafted with tungstophosphoric acid (i.e., HPW) to improve its selective catalytic reduction (SCR) performance at high temperatures. To investigate the mechanism of HPW grafting on the SCR activity of γ-Fe₂O₃, the kinetic parameters of NO reduction over γ-Fe₂O₃ and those of HPW/Fe₂O₃-500 were compared. Both the recrystallization of γ-Fe₂O₃ and the phase transition of spinel to hematite were restrained after HPW grafting, resulting in a higher Brunauer–Emmett–Teller surface area of HPW/Fe₂O₃-500. Meanwhile, the grafted HPW had a high acid strength, so the adsorption of NH₃ on γ-Fe₂O₃ was promoted remarkably. Furthermore, the C–O reaction over γ-Fe₂O₃ was inhibited notably after HPW grafting as its oxidation ability decreased. Therefore, HPW/Fe₂O₃-500 exhibited superior SCR activity at 250–500 °C, which was suitable for the power plants burning lignite.

中文翻译：

促进ħ ₃ PW ₁₂ ö ₄₀嫁接于NO _X消减超过了γ-Fe ₂ ö ₃：性能和反应机理

在这项研究中，γ-的Fe ₂ ö ₃用磷钨酸（即，HPW）接枝到提高在高温下它的选择性催化还原（SCR）的性能。为了研究HPW的接枝对γ-Fe的SCR活性的机构₂ Ó ₃，NO还原过γ-Fe的动力学参数₂ ö ₃和那些HPW的/铁₂ ö ₃ -500进行比较。两者的再结晶γ-的Fe ₂ ö ₃和尖晶石的赤铁矿相变被HPW接枝后抑制，导致HPW /较高的布鲁诺尔-埃米特-特勒表面积的Fe ₂ ö ₃-500。同时，接枝HPW具有高的酸强度，所以NH的吸附₃对γ-的Fe ₂ ö ₃被显着促进。此外，经γ-的Fe的C-O反应₂ ö ₃被HPW接枝作为其氧化能力下降后显着抑制。因此，HPW / Fe ₂ O ₃ -500在250–500°C时表现出优异的SCR活性，非常适合燃烧褐煤的发电厂。

更新日期：2018-10-03

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11