Active oxygen-promoted NO catalytic on monolithic Pt-based diesel oxidation catalyst modified with Ce

Liang, Yanli; Ding, Xinmei; Dai, Jingyu; Zhao, Ming; Zhong, Lin; Wang, Jianli; Chen, Yaoqiang

doi:10.1016/j.cattod.2018.06.008

Cited by 32 publications

(13 citation statements)

References 38 publications

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“…The T 90 gaps between Pt/Al 2 O 3 and CeO 2 -Pt/Al 2 O 3 catalyst for CO and C 3 H 8 conversions are higher than the corresponding T 50 gaps, reaching 41.2 • C and 92.0 • C, respectively. These results indicate that the ceria addition significantly promotes low-temperature catalytic oxidation of CO, NO, C 3 H 6 and C 3 H 8 , which agree well with the literature [10,13,16,20]. In addition, the CeO 2 -Pt/Al 2 O 3 catalyst showed the lower characteristic temperatures for CO, NO and C 3 H 6 conversion than that of the reference catalyst, although there was no obvious superiority for catalytic oxidation of C 3 H 8 .…”

Section: Catalytic Performancesupporting

confidence: 89%

“…The ceria addition into Pt-based diesel oxidation catalyst (DOC) showed the positive impact on the improvement of platinum dispersion, and generation of more active oxygen species and oxygen vacancies over the catalyst, which strengthens the interactions between NO molecules and the catalyst surfaces to promote NO oxidation into NO 2 and form nitrate species [13]. The introduction of cerium into Pt/Al 2 O 3 catalyst leads to enhancing the dispersity of active Pt nanoparticles and reducibility of catalyst, which was reported by Ma et al [14].…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, the incipient wetness impregnation method was considered as the most practical method, resulting from requiring the use of low-cost inorganic precursors, such as Ce(NO 3 ) 3 (cerium nitrate) and (NH 4 ) 2 [Ce(NO 3 ) 6 ] (diammonium hexanitrate cerate) [10,20]. The cerium addition by incipient wetness impregnation using Ce(NO 3 ) 3 has been successfully employed to prepare the highly-efficient automotive catalysts [13]. However, the structure evolution of precursors is still unknown during the process for preparing the cerium-modified Pt/Al 2 O 3 catalyst.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Wang

Ren

et al. 2020

Catalysts

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Ceria-modified Pt/Al2O3 catalyst has been commonly prepared by the impregnation of platinum on ceria-modified alumina and widely applied in the chemical industry and automotive industry. The in situ diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS), and thermogravimetric (TG) analysis techniques were employed to investigate the typical mechanisms of the bis(ethanolammonium)hexahydroxyplatinate(IV) and cerium nitrate decomposition catalyzed by Ptδ+ species for the facile synthesis of CeO2-Pt/Al2O3 catalyst. It was found that Pt4+-catalyzed decomposition of cerium nitrate leads to the higher dispersity of ceria and forming more active oxygen species, on the basis of X-ray diffraction (XRD) and H2 temperature-programmed reduction (H2-TPR) results. The in situ activity measurements were also performed to investigate the reaction mechanisms and the specific activities for the catalytic CO, NO, C3H6 and C3H8 co-oxidation. The results indicate that undesirable N2O by-product is formed by the selective catalytic reduction (SCR) of NO by C3H6 below 350 °C. The cerium addition effectively improves the activity of catalytic oxidation, but exhibits an increased N2O yield, due to the increased reducibility.

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Section: Catalytic Performancesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Wang

Ren

et al. 2020

Catalysts

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“…In addition, it also oxidizes nitric oxide (NO) to nitrogen dioxide (NO 2 ) [22]. It promotes continuous regeneration of downstream diesel particulate filters and improves the conversion efficiency of NO x via selective catalytic reduction at low temperatures [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

Zhang

Tian

et al. 2021

Processes

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To improve the combustion and emission characteristics of diesel engines, methanol-diesel fuels with different mixing ratios (DM0, DM10, DM20, DM30, and DM40) were used to investigate the effects of methanol addition on the combustion and emission of a four-stroke diesel engine in terms of cylinder pressure, brake power, brake-specific fuel consumption, and nitrogen oxides, soot, and carbon monoxide emissions. Firstly, an improved entire diesel engine model was developed using AVL-BOOST software and validated by the experimental results. The results showed that the increase of methanol content in the fuel mixture had a negative impact on the performance characteristic of the diesel engine, but significantly improved the emission characteristic of the diesel engine. With the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the cylinder pressure of the engine increased by 0.89%, 1.48%, 2.29%, and 3.17%, respectively. However, the power decreased by 3.76%, 6.74%, 11.35%, and 15.45%, the torque decreased by 3.76%, 6.74%, 11.35%, and 15.45%, respectively, and the brake specific fuel consumption increased by 3.77%, 6.92%, 12.33%, and 17.61%, respectively. In addition, with the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the carbon monoxide emission decreased by 21.32%, 39.04%, 49.81%, and 56.59% and the soot emission decreased by 0.25%, 8.69%, 16.81%, and 25.28%, respectively. Therefore, the addition of methanol to the fuel can improve the combustion and emission characteristics of the engine.

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“…However, due to the uneven flow field in the standard catalytic converter in practice, the purification of pollutants is limited (Mu et al 2019a;Shen et al 2019). Besides, it also causes sintering of the catalyst, affecting its later use (Gao et al 2019;Liang et al 2019). Therefore, it is necessary to further improve the uniformity of flow field in catalytic converters (Andrew et al 2014).…”

Section: Introductionmentioning

confidence: 99%

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

Zuo

Yang

Zhang

et al. 2021

Environ Sci Pollut Res

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Improving the flow field uniformity of catalytic converter can promote the catalytic conversion of NO to NO2. Firstly, the physical and mathematical models of improved catalytic converter are established, and its accuracy is verified by experiments. Then, the NO catalytic performance of standard and improved catalytic converters is compared, and the influences of structural parameters on its performance are investigated. The results showed that: (1) The gas uniformity, pressure drop and NO conversion rate of the improved catalytic converter are increased by 0.0643, 6.78% and 7.0% respectively. (2) As the cell density combination is 700 cpsi/600 cpsi, NO conversion rate reaches the highest, 73.7%, and the gas uniformity is 0.9821. (3) When the tapered height is 20 mm, NO conversion rate reaches the highest, 72.4%, the gas uniformity is 0.9744. (4) When the high cell density radius is 20 mm, NO conversion rate reaches the highest, 72.1%, the gas uniformity is 0.9783. (5) When the tapered end face radius is 20 mm, NO conversion rate reaches the highest, 72.0%, the gas uniformity is 0.9784. The results will provide a very important reference value for improving NO catalytic and reducing vehicle emission.

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Active oxygen-promoted NO catalytic on monolithic Pt-based diesel oxidation catalyst modified with Ce

Cited by 32 publications

References 38 publications

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

In Situ Investigations on the Facile Synthesis and Catalytic Performance of CeO2-Pt/Al2O3 Catalyst

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

NO catalytic performance analysis of gasoline engine tapered variable cell density carrier catalytic converter

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