One-pot synthesis of Cu-Ce co-doped SAPO-5/34 hybrid crystal structure catalysts for NH3-SCR reaction with SO2 resistance

SAPO-34, SAPO-5/34 based catalysts doped with Cu, Ce as active components were synthesized via a one-pot hydrothermal method by using different amounts of additive (alpha-cellulose), and their catalytic activities were measured for selective catalytic reduction (SCR) of NO with NH3. The synthesized Cu-Ce co-doped products switch from cubic SAPO-34, to flower-like aggregated SAPO-5/34, hybrid crystal SAPO-5/34, and finally to spherical aggregated SAPO-34 with the increase of alpha-cellulose amount. The Cu -Ce co-doped SAPO-5/34 hybrid crystal structure catalysts with 0.75 mol ratios of C/P (Cu-Ce/SP-0.75) exhibit excellent NH3-SCR activity with higher than 90% NOx( )conversion in the temperature range of 180 - 450 degrees C, at WHSV of 20000 mL/(g.h). Furthermore, the catalyst displays outstanding sulfur resistance and NOx conversion maintains above 90% at 200-450 degrees C after adding 100 ppm of SO2. The characteristic results suggest that the high deNO(x) performance of Cu-Ce/SP-0.75 is due to the enhanced accessibility, abundant activity species, excellent redox property and high adsorptive and activated capacity for NH3 . (C) 2021 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.

Automated summary

Cu-Ce co-doped SAPO-5/34 catalysts synthesized via hydrothermal method exhibit excellent performance in NH3-SCR activity, with over 90% NOx conversion. The catalyst shows outstanding sulfur resistance, maintaining NOx conversion above 90% at temperatures of 200-450 degrees Celsius even after adding 100 ppm of SO2.