Catalyst Additives to Enhance Mercury Oxidation and Capture Page: 2 of 17
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Preliminary research has shown that SCR catalysts employed for nitrogen-oxide
reduction can effectively oxidize mercury. This report discusses initial results from fundamental
investigations into the behavior of mercury species in the presence of SCR catalysts at Southern
Research Institute. The testing was performed at Southern Research's Catalyst Test Facility, a
bench-scale reactor capable of simulating gas-phase reactions occurring in coal-fired utility
pollution-control equipment. Three different SCR catalysts are currently being studied in this
project - honeycomb-type, plate-type, and a hybrid-type catalyst. The catalysts were
manufactured and supplied by Cormetech Inc., Hitachi America Ltd., and Haldor-Topsoe Inc.,
respectively. Parametric testing was performed to investigate the contribution of flue-gas
chemistry on mercury oxidation via SCR catalysts. Methods and procedures for experimental
testing continue to be developed to produce the highest quality mercury-oxidation data.
Most experiments so far have focused on testing the catalysts in a simulated Powder
River Basin (PRB) flue-gas environment, which contains lower sulfur and chlorine than
produced by other coals. Future work to characterize flue gas simulations typically derived from
low and high sulfur bituminous coal will be performed in a stepwise manner, to avoid the
constant interruptions in testing that occur when leaks in the system are generated during
temperature transitions. Specifically, chlorine concentration vs. mercury oxidation graph will be
developed for each catalyst. The contributions of temperature and later sulfur will be
investigated after this is complete. Also, last quarter's tests showed a potential linear
relationship between SO3 conversion and mercury oxidation. As a result, S03 samples will be
taken more frequently to investigate each catalyst's ability to selectively oxidize mercury.
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Berry, Alex J. & Gale, Thomas K. Catalyst Additives to Enhance Mercury Oxidation and Capture, report, September 30, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc877787/m1/2/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.