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Pore-Rich Ni-Co Spinel Oxides for Treating Soot Oxidation in Engine Exhausts.

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Titel: Pore-Rich Ni-Co Spinel Oxides for Treating Soot Oxidation in Engine Exhausts.
Autoren: Xu, Linsheng, Chen, Kaixuan, Li, Yuanfeng, Ma, Yaxiao, Cui, Baolong, Xiong, Jing, Wei, Yuechang
Quelle: Catalysts (2073-4344); Mar2025, Vol. 15 Issue 3, p267, 11p
Schlagwörter: SUSTAINABILITY, METAL catalysts, PRECIPITATION (Chemistry), X-ray powder diffraction, COORDINATE covalent bond
Abstract: Noble metals are still in high demand for exhaust control catalysts in mobile sources. Designing highly efficient and less costly catalysts for soot purification from engine emissions is a challenge. Herein, the Ni-Co spinel oxide catalyst made of earth-abundant elements was synthesized by a precipitation method. Based on the test results of powder X-ray diffraction (XRD), N2 adsorption–desorption experiments, the temperature-programmed oxidation of soot (soot-TPO), the temperature-programmed oxidation of NO (NO-TPO), the temperature-programmed reduction in H2 (H2-TPR), and the advantages of Ni-Co synergistic catalysts relative to pure NiO and Co3O4 oxides were systematically investigated. The NiCo2O4 catalyst exhibits excellent catalytic performance and stability during soot oxidation compared with NiO and Co3O4 catalysts, i.e., its T10, T50, T90 and SCO2m are 316, 356, 388 °C and 99.95%, respectively. The mechanism of the Ni-Co synergy effect for boosting soot oxidation on the spinel oxide catalyst is proposed according to the experimental results of in situ diffuse reflectance infrared Fourier transform spectra (in situ DRIFTS) and the theoretical knowledge of coordination chemistry of metal–NO. This study lays a good foundation for exhaust purification by non-noble metal catalysts for pollution control and sustainable environmental practices. [ABSTRACT FROM AUTHOR]
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Datenbank: Complementary Index
Beschreibung
Abstract:Noble metals are still in high demand for exhaust control catalysts in mobile sources. Designing highly efficient and less costly catalysts for soot purification from engine emissions is a challenge. Herein, the Ni-Co spinel oxide catalyst made of earth-abundant elements was synthesized by a precipitation method. Based on the test results of powder X-ray diffraction (XRD), N<subscript>2</subscript> adsorption–desorption experiments, the temperature-programmed oxidation of soot (soot-TPO), the temperature-programmed oxidation of NO (NO-TPO), the temperature-programmed reduction in H<subscript>2</subscript> (H<subscript>2</subscript>-TPR), and the advantages of Ni-Co synergistic catalysts relative to pure NiO and Co<subscript>3</subscript>O<subscript>4</subscript> oxides were systematically investigated. The NiCo<subscript>2</subscript>O<subscript>4</subscript> catalyst exhibits excellent catalytic performance and stability during soot oxidation compared with NiO and Co<subscript>3</subscript>O<subscript>4</subscript> catalysts, i.e., its T<subscript>10</subscript>, T<subscript>50</subscript>, T<subscript>90</subscript> and S<subscript>CO2</subscript><sup>m</sup> are 316, 356, 388 °C and 99.95%, respectively. The mechanism of the Ni-Co synergy effect for boosting soot oxidation on the spinel oxide catalyst is proposed according to the experimental results of in situ diffuse reflectance infrared Fourier transform spectra (in situ DRIFTS) and the theoretical knowledge of coordination chemistry of metal–NO. This study lays a good foundation for exhaust purification by non-noble metal catalysts for pollution control and sustainable environmental practices. [ABSTRACT FROM AUTHOR]
ISSN:20734344
DOI:10.3390/catal15030267