2026-05-31T04:58:28Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/325192026-02-03T10:51:50Zcom_10630_2254col_10630_37953

Reduction of Typical Diesel NOx Emissions by SCR-NH3 Using Metal-Exchanged Natural Zeolite and SBA-15 Catalysts. Alcantara, P.M.P. Moura de Oliveira, Mona Lisa Santiago de Araújo, Jesuína Cássia Dos Santos Araújo, Rinaldo Chaves de Lima, Rita Karolinny Bueno, André Valente Vieira da Silva, Maria Eugênia Costa Rocha, Paulo Alexandre Rodríguez-Castellón, Enrique Aire - Contaminación Combustibles fósiles In this work, the catalytic performance of clinoptilolite (CLIN) and SBA-15 catalysts, doped with Fe and Cu, was evaluated in the selective catalytic reduction of NO using NH3 as a reducing agent (SCR-NH3). Both Cu-CLIN and Fe-CLIN were obtained by ion-exchange using natural clinoptilolite zeolite originating from the Hrabovec deposit (northeast Slovakia region). Cu- SBA-15 and Fe-SBA-15 were prepared by impregnation into SBA-15 mesoporous synthesized silica. Standard catalytic activity tests were carried out on a bench-scale laboratory apparatus using a reaction mixture of a standard test. GHSV of 48,000 h􀀀1 was adopted based on the space velocity of a real NH3-SCR catalyst for diesel vehicles (100–550 C). All Cu-doped samples showed better NO conversion values than Fe-doped samples. Clinoptilolite catalysts were more active than those based on SBA-15. Maximum NO conversions of about 96% were observed for Cu-CLIN and Fe-CLIN at 350–400 C, respectively. Moreover, Fe-CLIN also showed higher stability in the presence of SO2 and water steam at 350 C. These results demonstrate the potential of metal-doped natural clinoptilolite to be used as cost-effective catalysts applied to the abatement of NOx emissions generated in automotive combustion processes. 2024-09-11T09:27:08Z 2024-09-11T09:27:08Z 2024-09-11T09:27:08Z 2023-06-30 journal article Alcantara, A.P.M.P.; Moura de Oliveira, M.L.; Santiago de Araújo, J.C.; dos Santos Araújo, R.; Chaves de Lima, R.K.; Bueno, A.V.; Vieira da Silva, M.E.; Costa Rocha, P.A.; Rodríguez-Castellón, E. Reduction of Typical Diesel NOx Emissions by SCR-NH3 Using Metal-Exchanged Natural Zeolite and SBA-15 Catalysts. Air 2023, 1, 159–174. https:// doi.org/10.3390/air1030012 https://hdl.handle.net/10630/32519 10.3390/air1030012 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI