Growing concern over the environmental impact of shipping has forced local, regional and global action, requiring reductions in emissions such as Nitrogen Oxides (NOx), Sulphur Oxides (SOx), Volatile Organic Compounds (VOCs) and Particulate Matter (PM).
Globally, the IMO (International Maritime Organization) has set a progressive timetable for limiting NOx and SOx emissions. In Emission Control Areas (ECA) tighter limits and an accelerated timetable of restrictions apply. The number and coverage of ECAs is set to grow in the next few years, with the inclusion of the US and Canadian coastline expected by 2012. This will have a significant impact on ship engine activity (for propulsion, auxiliary power generation etc) in these areas with the NOx limit restrictions (for ships launched from 2016) expected to require the use of after treatment technology. The most effective means of removing NOx is Selective Catalytic Reduction (SCR). Nations such as Norway are using market instruments such as the NOx Fond to force a reduction in such emissions. SCR is proving a popular choice as the best available technology.
Johnson Matthey's SINOx® Clean Air SCR Systems, with Urea injection, has been successfully applied to shipping removing up to 95% of NOx – with over 150 installations on main and auxiliary engines. Johnson Matthey manufactures the key component of the system – the catalyst, and JM engineers offer long-term support from conceptual design through to an after sales service.
In offshore processes such as LNG re-gasification local regulations can require restrictive limits on emissions of VOCs, CO and NOx. Johnson Matthey's family of products e.g. SCR in conjunction with an oxidation catalyst, have been used to meet these requirements – with excellent results.