Manganese oxides supported on multi-walled carbon nanotubes for selective catalytic reduction of NO with NH3: Catalytic activity and characterization

Wang, Lishan; Huang, Bichun; Su, Yang; Zhou, Guangying; Wang, Keliang; Luo, Huimin; Ye, Daiqi

doi:10.1016/j.cej.2012.04.012

Cited by 149 publications

(81 citation statements)

References 60 publications

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“…Carbon materials, such as activated carbon (AC), activated carbon fiber (ACF), carbon nanotube (CNT), and graphene (GE), have been widely studied as substrates for supporting low-temperature SCR catalysts due to their high specific surface area, unique pore structure, excellent dispersion of active components, and chemical stability [70,[84][85][86]. Among these carbon materials, CNT and GE have been considered as good supports that can enhance the tolerance of H 2 O and SO 2 .…”

Section: Carbon Materials Supported Mn-based Catalystsmentioning

confidence: 99%

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

et al. 2018

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Selective catalytic reduction (SCR) with NH 3 is the most efficient and economic flue gas denitrification technology developed to date. Due to its high low-temperature catalytic activity, Mn-based catalysts present a great prospect for application in SCR de-NO x at low temperatures. However, overcoming the poor resistance of Mn-based catalysts to H 2 O and SO 2 poison is still a challenge. This paper reviews the recent progress on the H 2 O and SO 2 resistance of Mn-based catalysts for the low-temperature SCR of NO x . Firstly, the poison mechanisms of H 2 O and SO 2 are introduced in detail, respectively. Secondly, Mn-based catalysts are divided into three categories-single MnO x catalysts, Mn-based multi-metal oxide catalysts, and Mn-based supported catalysts-to review the research progress of Mn-based catalysts for H 2 O and SO 2 resistance. Thirdly, several strategies to reduce the poisonous effects of H 2 O and SO 2 , such as metal modification, proper support, the combination of metal modification and support, the rational design of structure and morphology, are summarized. Finally, perspectives and future directions of Mn-based catalysts for the low-temperature SCR of NO x are proposed.

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Section: Carbon Materials Supported Mn-based Catalystsmentioning

confidence: 99%

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

et al. 2018

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“…Figure 4 shows the H 2 -TPR results of various fresh catalysts. The three catalysts all present three redox peaks in the temperature ranges of 100-200 • C, 250-400 • C, and 450-700 • C, which correspond to the reduction of the surface oxygen, MnO 2 to Mn 3 O 4 and Mn 3 O 4 to MnO, respectively [9,30]. The peak at 325 • C which corresponded to the reduction of MnO 2 to Mn 3 O 4 played an important role in the reaction over MnZr [17,31].…”

Section: Scr Performancementioning

confidence: 99%

“…The MWCNTs were purchased from Shenzhen Nanotech Port Co. Ltd. (Shenzhen, China) According to Wang et al [9], the MWCNTs were pretreated in HNO3 solution by ultrasound for 30 min and heated at 100 °C for 4 h in a water-bath. Subsequently, MWCNTs were treated with filtration and washed by deionized water until the pH was neutral.…”

Section: Pretreatment Of Mwcntsmentioning

confidence: 99%

“…Some transition metal oxides (Fe, V, Cr, Cu, Mn) supported on catalysts have been found with high activities at low temperatures [5][6][7][8][9]. Among them, Mn-based catalysts have been investigated in depth via several means because manganese oxides contain various kinds of labile oxygen, which is beneficial for the fulfillment of the catalytic cycle [9][10][11][12][13][14][15][16]. MnO [17].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ce/Y Addition on Low-Temperature SCR Activity and SO2 and H2O Resistance of MnOx/ZrO2/MWCNTs Catalysts

et al. 2017

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Abstract:The effects of SO 2 and H 2 O on the low-temperature selective catalytic reduction (SCR) activity over MnO x /ZrO 2 /MWCNTs and MnO x /ZrO 2 /MWCNTs catalysts modified by Ce or Y was studied. MnCeZr and MnYZr catalysts reached nearly 100% and 93.9% NO x conversions at 200 • C and 240 • C, respectively. They displayed a better SO 2 tolerance, and the effect of H 2 O was negligible. The structural properties of the catalysts were characterized by XRD, H 2 -TPR, XPS, and FTIR before and after the reaction. The results showed that Ce could increase the mobility of the oxygen and improve the valence and the oxidizability of manganese, while the effect of Y was the opposite. This might be the main reason why the catalytic activity of MnCeZr was better than MnYZr in the presence or absence of SO 2 and H 2 O. Doping Ce or Y broadened the active temperature window. Ce or Y, which existed in the catalysts with a high dispersion or at the amorphous state, preferred to react with SO 2 to form sulfate species, and protected the manganese active sites from combing with SO 2 to some extent, which coincided with the theory of ionic polarization.

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“…A higher efficiency observed when SO 2 was introduced into the stream. Wang et al (2012) studied the catalytic reduction of NO with NH 3 in manganese oxides supported on multi-walled carbon nanotubes. They found that high manganese loading (25 wt.%) and high calcination temperature (500°C) will reduce the dispersion and increase the crystallinity of the catalysts.…”

Section: Multi-walled Carbon Nanotubes (Mwcnts)mentioning

confidence: 99%

Selective catalytic reduction of nitric oxide over cerium-doped activated carbons

Athappan

Sattler

Sethupathi

2015

Journal of Environmental Chemical Engineering

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Manganese oxides supported on multi-walled carbon nanotubes for selective catalytic reduction of NO with NH3: Catalytic activity and characterization

Cited by 149 publications

References 60 publications

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

Effect of Ce/Y Addition on Low-Temperature SCR Activity and SO2 and H2O Resistance of MnOx/ZrO2/MWCNTs Catalysts

Selective catalytic reduction of nitric oxide over cerium-doped activated carbons

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