Deactivation of Cu-SAPO-34 by urea-related deposits at low temperatures and the regeneration |
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Authors: | Yue M Xiaodong Wu Junyu Zhang Rui Ran Zhichun Si Duan Weng |
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Abstract: | Selective catalytic reduction (SCR) with urea catalyzed by Cu-SAPO-34 is an effective method to eliminate NOx from diesel exhaust. However, urea-related deposits may form during cold-start and urban driving due to low exhaust temperatures. The activity of Cu-SAPO-34 at 175°C is significantly degraded by urea exposure, and 300°C is required for regeneration. Through in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature-programmed hydrolysis studies, the dominant stable deposit at 175°C is identified as biuret, which can be eliminated at 300°C. The urea-derived deactivation and regeneration mechanisms of Cu-SAPO-34 were compared with those of anatase-supported catalysts. |
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Keywords: | SCR Urea Biuret Cu-SAPO-34 Deactivation |
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