粉煤灰负载锰基催化剂低温脱硝活性及水硫抗性的实验研究

Translated title of the contribution: Experimental study of Mn-based catalysts supported on coal fly ash for selective catalytic reduction of NOx and their resistance to SO2/H2O at low-temperatures

Xiaoxu Duan, Jinxiao Dou, Aoran Wei, Yongqi Zhao, Jianglong Yu

Research output: Contribution to journalConference articleOther

1 Citation (Scopus)

Abstract

Mn-Fe/FA(N) and Mn-Fe/FA catalysts were synthesized by using the ultrasonic-assisted precipitation method. These catalysts consisted of fly ash (as the carrier), Fe (ferric nitrate as the precursor) and Mn (manganese nitrate or potassium permanganate as the precursor). The NH3-SCR reactions were conducted in a specially designed fixed-bed reactor. The de-NOx and the resistance (SO2 and H2O) mechanism of catalysts were analyzed by X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD) and H2-temperature programmed reduction (H2-TPR). The results showed that the NOx conversion of Mn-Fe/FA was significantly higher than that of Mn-Fe/FA(N). The Mn-Fe/FA catalyst exhibited a wider operating temperature range (70~200℃). Moreover, Mn-Fe/FA catalyst maintained the initial NOx conversion (99%) for 4h in the H2O (5 or 10%) at 200℃. In the presence of SO2 and H2O at 200°C, Mn-Fe/FA was able to maintain over 75% NOx conversion after 4h. KMnO4, as a source of Mn in Mn-Fe/FA, promoted the redox properties of the corresponding catalyst and increased the concentrations of active metal ions (Mn4+, Fe3+) and chemically adsorbed oxygen. It was found that using KMnO4 as a source of Mn can inhibit the formation of metal sulfates.

Translated title of the contributionExperimental study of Mn-based catalysts supported on coal fly ash for selective catalytic reduction of NOx and their resistance to SO2/H2O at low-temperatures
Original languageMandarin
Pages (from-to)4102-4111
Number of pages10
JournalZhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
Volume42
Issue number11
DOIs
Publication statusPublished - 2022
Externally publishedYes
EventChinese Society for Electrical Engineering 2022 - Sanya, China
Duration: 25 Feb 202227 Feb 2022
https://web.archive.org/web/20220103120430/http://www.csee.net/

Keywords

  • Fly ash
  • Low-temperature de-NO
  • Mn-based catalysts
  • NH-SCR

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