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Low temperature performance and sulfur resistance enhancement of Mn-Ce oxides supported on W-modified MWCNT for NH3-SCR removal of NOx
Journal of the Air & Waste Management Association ( IF 2.7 ) Pub Date : 2021-01-11
Xiang Tu, Zugen Liu, Dan He, Baoping Xu, Meijuan Lu, Bichun Huang, Yong Zhang, Chenglong Yu

Abstract

To eliminate nitrogen oxides (NOx), composite carrier-supported catalysts (Mn-Ce/MWCNT-W) and traditional catalysts (Mn-Ce/MWCNT and W-Mn-Ce/MWCNT) were prepared using an ultrasonic impregnation method that preformed low-temperature ammonia-selective catalytic reduction (SCR) removal of NOx. The promotion effects of MWCNT-W composite carriers for low temperature SCR activities and SO2 tolerance of the catalysts were systematically investigated. Compared to traditional catalyst, Mn-Ce/MWCNT-W catalyst, with a 30% WOx/MWCNT mass ratio, demonstrated improved SCR activity and high N2-selectivity from 100–200°C. A series of characterizations were carried out and it was found that there were more redox sites and the stronger the NH3 adsorption capacity over the composite carrier-supported catalysts than traditional catalysts. Also, with this composite carrier-supported catalyst, the improvement of SCR reaction was considered to be from the abundance of high valence state Mn and well dispersed active components. Notably, compared to traditional catalyst, the composite carrier-supported catalyst exhibited the stronger sulfur resistance. Thus, using MWCNT-W composite carriers to prepare Mn-Ce/MWCNT-W catalysts resulted in excellent NOx conversion and SO2 resistance at low temperatures.

Implication Statement

LT NH3-SCR of NOx is an effective way to remove NOx from stationary sources. The physicochemical properties of the support not only affect a catalyst’s LT SCR activity but also affect the catalyst’s anti-poisoning performance. The modified carriers could promote active component dispersion, which is conducive to SCR reaction. However, for LT SCR reactions, few reports have addressed the design and preparation of composite carrier-supported catalysts. The goal of this study was to design and synthesize Mn-Ce/MWCNT-W catalysts and to observe the influence of composite support in Mn-based catalysts on LT SCR activity and sulfur resistance



中文翻译:

W改性MWCNT上负载的Mn-Ce氧化物的低温性能和耐硫性增强,用于NH3-SCR去除NOx

摘要

为了消除氮氧化物(NO x),使用预先形成的超声浸渍法制备了复合载体负载催化剂(Mn-Ce / MWCNT-W)和传统催化剂(Mn-Ce / MWCNT和W-Mn-Ce / MWCNT)。低温氨选择性催化还原(SCR)去除NO x。系统地研究了MWCNT-W复合载体对催化剂的低温SCR活性和SO 2耐受性的促进作用。与传统催化剂相比,WO x / MWCNT质量比为30%的Mn-Ce / MWCNT-W催化剂具有改善的SCR活性和高N 2选择性从100–200°C。进行了一系列表征,发现与传统载体催化剂相比,复合载体负载的催化剂具有更多的氧化还原位点和更强的NH 3吸附能力。同样,对于这种复合载体负载的催化剂,SCR反应的改善被认为是由于大量的高价态Mn和良好分散的活性组分。值得注意的是,与传统催化剂相比,复合载体负载的催化剂表现出更强的抗硫性。因此,使用MWCNT-W复合载体制备Mn-Ce / MWCNT-W催化剂在低温下具有优异的NO x转化率和抗SO 2的能力。

暗示声明

LT NH 3 NO的-SCR X是去除NO的有效方法X从固定源。载体的物理化学性质不仅影响催化剂的LT SCR活性,而且影响催化剂的抗中毒性能。改性后的载体可以促进活性成分的分散,有利于SCR反应。但是,对于LT SCR反应,很少有报道涉及复合载体负载催化剂的设计和制备。这项研究的目的是设计和合成Mn-Ce / MWCNT-W催化剂,并观察Mn基催化剂中复合载体对LT SCR活性和耐硫性的影响。

更新日期:2021-01-12
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