Promotional effect of CuO loading on the catalytic activity and SO2resistance of MnOx/TiO2catalyst for simultaneous NO reduction and Hg0oxidation

Zequn Yang, Hailong Li, Xi Liu, Pu Li, Jianping Yang, Po Heng Lee, Kaimin Shih

Research output: Journal article publicationJournal articleAcademic researchpeer-review

48 Citations (Scopus)

Abstract

CuO loaded MnO x/TiO 2 mixed oxide (CuMnTi) synthesized by an ultrasonic-assisted impregnation method was for the first time employed for simultaneous nitrogen monoxide (NO) reduction and elemental mercury (Hg 0) oxidation under selective catalytic reduction (SCR) atmosphere with the presence of NH 3. The CuMnTi catalyst exhibited a wide temperature window from 150 to 250 °C for both NO reduction and Hg 0 oxidation. At the optimal temperature of 175 °C, CuMnTi reduced 96.4% of the inlet NO and oxidized 100% of the inlet Hg 0 at a very high gas hourly space velocity (GHSV) of 40,000 h −1. O 2, HCl and NO significantly promoted Hg 0 oxidation and offset the adverse effect of detrimental flue gas components such as water vapor, SO 2 and NH 3. The protection effect of CuO over MnO x reserved enough active sites of CuMnTi for Hg 0 oxidation in the presence of NH 3 or SO 2. Compared with MnO x/TiO 2 (MnTi), the superior redox property, enlarged Hg 0 adsorption capacity and decent SO 2 resistance of CuMnTi ternary system were evidenced to account for its improved catalytic activity. This study indicated future potential for applying CuMnTi catalyst in simultaneous NO reduction and Hg 0 oxidation in low-temperature (150–250 °C) and low-rank (sub-bituminous and lignite) coal combustion flue gases.

Original languageEnglish
Pages (from-to)79-88
Number of pages10
JournalFuel
Volume227
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Catalysis
  • Coal combustion
  • CuMnTi ternary mixed oxide
  • Flue gas
  • Mercury

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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