Industrial and municipal wastes, as well as biomass from wood and plant material contain contaminants that can poison emission control catalysts. Most challenging are high-dust applications in which the raw gas exposes the catalyst to contaminants such as alkali or earth alkali metals, phosphorous or heavy metals. Depending on the plant configuration, Johnson Matthey offers high-dust SCR catalyst and low-dust SCR catalyst to achieve exceptionally low nitrogen oxide (NOx) emissions. With NOx reductions of more than 90%, current and future NOx requirements can easily be attained at very low NH3 slip. Johnson Matthey can provide air pollution solutions for many different plant configurations with its large catalyst portfolio.
Johnson Matthey has equipped more than 200 biomass and Waste-to-Energy (WtE) plants in Europe and Asia with SCR catalyst. Nevertheless, experience has shown that there is no one-size-fits-all SCR solution because of the many plant-specific process parameters. As a catalyst expert and supplier of catalytic emission control systems, Johnson Matthey works closely with the customer to choose the optimum air pollution solution for each application.
Utilization of SCR catalyst offers benefits in addition to NOx reduction. Other harmful pollutants including dioxins, furans, formaldehyde, mercury and volatile organic compounds (VOCs) are also oxidized to a significant extent over the SCR catalyst. The oxidation of these compounds takes place in the same temperature range as the SCR reactions which is why SCR catalyst not only reduces NOx, but reduces other criteria pollutants as well. Installation of Johnson Matthey SCR catalyst reduces air pollution allowing biomass and WtE plants to generate clean energy, and protects the environment and health through catalytic emission control.
