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In this study,we used a simple impregnation method to prepare Fe-Ce-O_x catalysts and tested them regarding their low-temperature(200-300 ℃) selective catalytic reduction(SCR) of NO using NH_3.We investigated the effects of Fe/Ce molar ratio,the gas hourly space velocity(GHSV),the stability and SO_2/H_2O resistance of the catalysts.The results showed that the FeCe(1:6)O_x(Ce/Fe molar ratio is 1:6) catalyst,which has some ordered parallel channels,exhibited good SCR performance.The FeCe(1:6)O_x catalyst had the highest NO conversion with an activity of 94-99%at temperatures between 200 and300 ℃ at a space velocity of 28,800 h~(-1).The NO conversion for the FeCe(1:6)O_x catalyst also reached 80-98%between 200 and 300 ℃ at a space velocity of204,000h~(-1).In addition,the FeCe(1:6)O_x catalyst demonstrated good stability in a 10-h SCR reaction at200-300 ℃.Even in the presence of SO_2 and H_2O,the FeCe(1:6)O_x catalyst exhibited good SCR performance.
In this study, we used a simple impregnation method to prepare Fe-Ce-O x catalysts and tested them for their low-temperature (200-300 ° C) selective catalytic reduction (SCR) of NO using NH_3. We investigated the effects of Fe / Ce molar ratio, the gas hourly space velocity (GHSV), the stability and SO 2 / H 2 O resistance of the catalysts.The results showed that the FeCe (1: 6) O_x (Ce / Fe molar ratio is 1: 6) catalyst, which has some ordered parallel channels, exhibiting good SCR performance. The FeCe (1: 6) O_x catalyst had the highest NO conversion with an activity of 94-99% at temperatures between 200 and 300 ° C at a space velocity of 28,800 h ~ (-1) ). The NO conversion for the FeCe (1: 6) O_x catalyst also reached 80-98% between 200 and 300 ° C at a space velocity of 204,000 h -1 .In addition, the FeCe (1: 6) O_x catalyst demonstrated good stability in a 10-h SCR reaction at 200-300 ° C. Even in the presence of SO 2 and H 2 O, the FeCe (1: 6) O x catalyst exhibiting good SCR performance.