PMID: 18422035Apr 22, 2008Paper

Mercury oxidation promoted by a selective catalytic reduction catalyst under simulated Powder River Basin coal combustion conditions

Journal of the Air & Waste Management Association
Chun W LeeThomas W Hastings

Abstract

A bench-scale reactor consisting of a natural gas burner and an electrically heated reactor housing a selective catalytic reduction (SCR) catalyst was constructed for studying elemental mercury (Hg(o)) oxidation under SCR conditions. A low sulfur Powder River Basin (PRB) subbituminous coal combustion fly ash was injected into the entrained-flow reactor along with sulfur dioxide (SO2), nitrogen oxides (NOx), hydrogen chloride (HCl), and trace Hg(o). Concentrations of Hg(o) and total mercury (Hg) upstream and downstream of the SCR catalyst were measured using a Hg monitor. The effects of HCl concentration, SCR operating temperature, catalyst space velocity, and feed rate of PRB fly ash on Hg(o) oxidation were evaluated. It was observed that HCl provides the source of chlorine for Hg(o) oxidation under simulated PRB coal-fired SCR conditions. The decrease in Hg mass balance closure across the catalyst with decreasing HCl concentration suggests that transient Hg capture on the SCR catalyst occurred during the short test exposure periods and that the outlet speciation observed may not be representative of steady-state operation at longer exposure times. Increasing the space velocity and operating temperature of the SCR led to less H...Continue Reading

References

May 18, 2001·Journal of the Air & Waste Management Association·S D SerreS B Ghorishi
Jan 15, 2005·Journal of the Air & Waste Management Association·Chun W LeeFrank M Stevens
Jan 18, 2006·Journal of the Air & Waste Management Association·Stephen Niksa, Naoki Fujiwara
Mar 30, 2006·Environmental Science & Technology·Yongxin ZhaoEdwin S Olson
Jun 3, 2006·Journal of the Air & Waste Management Association·Yongxin ZhaoGrant E Dunham

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Citations

Dec 2, 2009·Journal of the Air & Waste Management Association·Ravi BhardwajRadisav D Vidic
May 20, 2010·Journal of the Air & Waste Management Association·Hsing-Cheng HsiWang Chen
Apr 27, 2011·Journal of the Air & Waste Management Association·Jennifer WilcoxSang-Sup Lee
Aug 1, 2010·Progress in Energy and Combustion Science·James C HowerEdwin S Olson
Apr 5, 2016·Journal of the Air & Waste Management Association·D MusmarraG Mazziotti di Celso
Jul 15, 2015·Environmental Science & Technology·Yinyin WangFumei Wang
Jan 22, 2011·ACS Applied Materials & Interfaces·Shijian YangJinping Jia
Apr 9, 2009·Environmental Science & Technology·Herek L Clack
Apr 20, 2021·Energy & Fuels : an American Chemical Society Journal·Constance SeniorWayne Seames

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