MnO  supported on Fe–Ti spinel: A novel Mn based low temperature SCR catalyst with a high N2 selectivity

Yang, Shijian; Qi, Feihong; Xiong, Shangchao; Dang, Hao; Liao, Yong; Wong, Po Keung; Li, Junhua

doi:10.1016/j.apcatb.2015.08.023

Cited by 203 publications

(121 citation statements)

References 32 publications

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“…After the supply of SO2 and H2Owas cut off, the NO conversion recovered to 100% again quickly. Yang et al investigated the sulfur and water tolerance of Fe-Ti spinel supported MnOx catalyst [42]. As shown in Figure 19, the NOx conversion at 200 °C gradually decreased from 100 to 83% and then kept unchanged after 8% of H2O and 60 ppm of SO2 were introduced.…”

Section: Tio2 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: Tio2 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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“…Ref. [47] thought that both the Eley-Rideal mechanism and the Langmuir-Hinshelwood mechanism contributed to N 2 O formation. We think that the Eley-Rideal mechanism is suitable for explaining the reactions in this paper [52,53] From Figure 14, we find that N 2 O is formed and destroyed, most notably at about 200 °C.…”

Section: Catalytic Mechanism Of the Thermal Decomposition Of An Catalmentioning

confidence: 99%

“…Hence, we can confirm that the interaction happened at very low temperatures. The reaction was performed and NH 2 was formed [44][45][46][47]. If NH 2 is formed, the curve of the ion current would change.…”

Section: Catalytic Mechanism Of the Thermal Decomposition Of An Catalmentioning

confidence: 99%

Thermal Decomposition CharacteristicS of Ammonium Nitrate(v) in the Presence of Mn2O3/Graphene Oxides

et al. 2017

Cent. Eur. J. Energ. Mater.

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Nano-composites (Mn2O3, Mn2O3/graphene oxides (GO)) were prepared by a new method. The nano-composites were characterized by XRD and HRTEM. The catalytic performance of the nano-composites on the thermal decomposition of ammonium nitrate(V) (AN) was investigated by TG-DSC and TG-MS. The reaction of AN with the nano-composites in the condensed phase was investigated by RSFTIR. The results of TG-DSC experiments indicated that the nano-composites significantly catalyze the thermal decomposition of AN, especial Mn2O3/GO. The exothermic reaction of AN with Mn2O3/GO commenced at about 185 °C. Based on the TG-MS results, it was ascribed to N2O formation. In the RSFTIR experiments, the dissociation reaction and ionization reaction of AN were both detected. NOx formation at low temperature was also found. NH2 was directly oxidized by HNO3/NO3− at low temperature. The interaction between Mn2O3 and NH3 was detected according to DRIFT experiments. At elevated temperature, the functional groups of GO are destroyed, which had an influence on the interaction between Mn2O3 and GO. A probable mechanism for the exothermic reaction and then its disappearance is proposed. HNO3 gas was absorbed on the surface of solid AN, which can markedly catalyze the thermal decomposition of AN. Perhaps the HNO3 plays a key role in the exothermic reaction and then the reaction of AN disappears at very low temperatures.

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“…Currently, commercial SCR catalysts are mainly vanadium based with an active temperature range of 350-450 • C [4]. In this case, the SCR device must be installed before air preheater and after fuel economizer, so this installation is usually accompanied by a high concentration of ash and SO 2 which can cause catalyst poisoning [5].…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2

Gou

Wang

et al. 2017

Energies

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Mn-Ce/FA (M) and Mn-Ce/FA-TiO 2 (M), using fly ash (FA) with and without TiO 2 as the carriers, were prepared by an integral molding technique. With the increase of TiO 2 content, the rates of NO conversion and denitration of Mn-Ce/FA-TiO 2 (M) increased, and the NO 2 and N 2 O formation rates decreased. It is found that TiO 2 could effectively inhibit the excessive oxidation of NO and the generation of N 2 O. The effects of space velocity, oxygen concentration and ammonia nitrogen ratio on three types of nitrogen oxides (NO, NO 2 , N 2 O) and denitration rates of the Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO 2 (M) were further investigated. In addition, it is demonstrated that Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO 2 (M) were more suitable to be used in the environment of low sulfur and less water. • Mn-Ce/FA-30%TiO 2 (M) showed higher NO conversion than Mn-Ce/FA(M).

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MnO supported on Fe–Ti spinel: A novel Mn based low temperature SCR catalyst with a high N2 selectivity

Cited by 203 publications

References 32 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

Thermal Decomposition CharacteristicS of Ammonium Nitrate(v) in the Presence of Mn2O3/Graphene Oxides

Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2

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