Abstract
Abstract: Small-pore Cu-chabazite SCR catalysts with high NOx conversion at low temperatures are of inter-est for marine diesel engines with exhaust temperatures in the range of 150 to 300℃. Unfortunately, fuels for marine diesel engines can contain a high level of sulfur of up to 1.5% by volume, which corresponds to a SO 2 level of 500 ppm in the exhaust gases for an engine operating with an A/F ratio of 50:1. This high lev-el of SO 2 in the exhaust may have detrimental effects on the NOx performance of the Cu-chabazite SCR catalysts. In the present study, a bench-flow reactor is used to investigate the effects of sulfur poisoning on the NOx performance of Cu-chabazite SCR catalysts. The SCR catalysts were exposed to simulated diesel ex-haust gas stream consisted of 500 ppm SO 2 , 5% CO 2 , 14% O 2 , 5% H 2 O with N 2 as the balance gas at 150, 200, 250 and 300℃ for 2 hours at a GHSV of 30,000 h -1 . After sulfur poisoning the low-temperature NOx performance of the SCR catalyst is evaluated over a temperature range of 150-300℃ to determine the extent of the catalyst deactivation. Desulfation is also carried out at 600 and 700℃ for 30 minutes to determine whether it is possible to recover the NOx performance of the sulfur-poisoned SCR Catalysts.
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