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The deactivation mechanism by different types of sulfate was investigated for the selective catalytic reduction of NOx on Cu/SAPO-34 catalyst. A Cu/SAPO-34 catalyst was treated with 50ppm SO2 alone at 150 and 250°C or in the presence of a SCR feed at 250 and 350°C. Copper sulfate was found on all sulfated catalysts, but ammonia sulfate was found only on the catalyst sulfated in the SCR feed at 250°C...
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