NOx Catalyst Performance on Mercury and SO3 - Hot Topic April 14, 2011

 

The following speakers explained the current "state of the art" of SCR design and catalyst formulations relative to mercury oxidation and SO2 to SO3 conversion.

 

Mike Cooper, Vice President of Technology at CoaLogix explained the beneficial and detrimental reactions which impact the catalyst ability to oxidize elemental mercury. Promoters are the catalyst, lower temperatures, halogens, and V2O5. The inhibitors are NH3, H2O and SO2. Catalyst regeneration results show beneficial impacts on Hg oxidation.

 

Karin Madsen of Haldor Topsoe discussed the effect of operating conditions and catalyst type on mercury oxidation across the SCR catalyst. Up to 90 percent mercury oxidation is achievable depending on the inlet Hg speciation and the chlorine concentration. Greater than 91 percent mercury removal is achievable using existing control devices (the combination of the SCR-FGD strategy). Adding additional HCl above a certain point does not improve oxidation. However, bromine acts differently and therefore may provide greater oxidation with increased amounts.

 

John Cochran of Ceram Environmental presented results of a mercury oxidation test program which will continue through 2013.  It is a result of a new major focus on mercury in Europe. The challenge is to balance the NOx removal requirements with the goals for mercury oxidation and SO3 minimization. Results were presented for one power plant with 91 percent NOx removal and 95 percent mercury removal with a catalyst with an SO2 to SO3 conversion rate across the reactor of less than 0.5 percent.

 

Bio, Photo and Abstracts are shown below.
BIO, PHOTO AND ABSTRACTS - April 14, 2011.htm