{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["7(10)"],"submitter":["Dong A"],"pubmed_abstract":["Low-temperature selective catalytic oxidation (SCO) is crucial for removing the NH<sub>3</sub> slip from the upstream of NH<sub>3</sub>-selective catalytic reduction (NH<sub>3</sub>-SCR). Herein, combining zeolite Cu-SAPO34 and the active oxidant mullite SmMn<sub>2</sub>O<sub>5</sub>, we developed mixed-phase catalysts SmMn<sub>2</sub>O<sub>5</sub>/Cu-SAPO34 by grinding powder mixtures to achieve a low-temperature activity and a reasonable N<sub>2</sub> selectivity. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The evaluation of NH<sub>3</sub> oxidation activity showed that for 30 wt % SmMn<sub>2</sub>O<sub>5</sub>/Cu-SAPO34, 90% NH<sub>3</sub> conversion was at a temperature of 215 °C in the presence of 500 ppm NH<sub>3</sub> and 21% O<sub>2</sub> balanced with N<sub>2</sub>. The in situ DRIFTS spectra reveal the internal SCR mechanism (i-SCR), i.e., NH<sub>3</sub> oxidizing to NO <i><sub>x</sub></i> on mullite and NO <i><sub>x</sub></i> subsequently to proceed with SCR reactions, leading to higher conversion and selectivity over the mixed catalysts. This work provides a strategy to design the compound catalyst to achieve low-temperature NH<sub>3</sub> oxidation via synergistic utilization of the advantages of each individual catalyst."],"journal":["ACS omega"],"pagination":["8633-8639"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC8928535"],"repository":["biostudies-literature"],"pubmed_title":["Mixed Catalyst SmMn<sub>2</sub>O<sub>5</sub>/Cu-SAPO34 for NH<sub>3</sub>-Selective Catalytic Oxidation."],"pmcid":["PMC8928535"],"pubmed_authors":["Yang Z","Wang W","Dong A"],"additional_accession":[]},"is_claimable":false,"name":"Mixed Catalyst SmMn<sub>2</sub>O<sub>5</sub>/Cu-SAPO34 for NH<sub>3</sub>-Selective Catalytic Oxidation.","description":"Low-temperature selective catalytic oxidation (SCO) is crucial for removing the NH<sub>3</sub> slip from the upstream of NH<sub>3</sub>-selective catalytic reduction (NH<sub>3</sub>-SCR). Herein, combining zeolite Cu-SAPO34 and the active oxidant mullite SmMn<sub>2</sub>O<sub>5</sub>, we developed mixed-phase catalysts SmMn<sub>2</sub>O<sub>5</sub>/Cu-SAPO34 by grinding powder mixtures to achieve a low-temperature activity and a reasonable N<sub>2</sub> selectivity. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The evaluation of NH<sub>3</sub> oxidation activity showed that for 30 wt % SmMn<sub>2</sub>O<sub>5</sub>/Cu-SAPO34, 90% NH<sub>3</sub> conversion was at a temperature of 215 °C in the presence of 500 ppm NH<sub>3</sub> and 21% O<sub>2</sub> balanced with N<sub>2</sub>. The in situ DRIFTS spectra reveal the internal SCR mechanism (i-SCR), i.e., NH<sub>3</sub> oxidizing to NO <i><sub>x</sub></i> on mullite and NO <i><sub>x</sub></i> subsequently to proceed with SCR reactions, leading to higher conversion and selectivity over the mixed catalysts. This work provides a strategy to design the compound catalyst to achieve low-temperature NH<sub>3</sub> oxidation via synergistic utilization of the advantages of each individual catalyst.","dates":{"release":"2022-01-01T00:00:00Z","publication":"2022 Mar","modification":"2025-04-04T20:22:15.653Z","creation":"2025-04-04T20:22:15.653Z"},"accession":"S-EPMC8928535","cross_references":{"pubmed":["35309489"],"doi":["10.1021/acsomega.1c06648"]}}