Oxidative reactivity enhancement for soot combustion catalysts by co-doping silver and manganese in ceria

Li, Shuirong; Yan, Shuai; Xia, Yongkang; Cui, Bing; Pu, Yu; Ye, Yueyuan; Wang, Duo; Chen, Binghui

doi:10.1016/j.apcata.2018.11.033

Cited by 41 publications

(11 citation statements)

References 59 publications

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“…Noble metals, such as Ru, have also been investigated as dopants to successfully improve ceria-based catalyst stability after aging at 800 °C in O 2 [ 17 ]. Although all the studies described previously investigated stability through accelerated thermal aging, only a few studies investigated stability through more realistic, albeit more cumbersome, soot oxidation cycles [ 18 , 19 , 20 , 21 ]. La loaded on CeO 2 –ZnO (five cycles) [ 21 ], K added into CeO 2 (three cycles) [ 18 ], codoping of Ag and Mn into CeO 2 (three cycles) [ 19 ], and Au-doped Ce 0.8 Zr 0.2 O 2 (three cycles) [ 20 ] all showed enhanced stability of ceria-based catalysts for soot oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…Although all the studies described previously investigated stability through accelerated thermal aging, only a few studies investigated stability through more realistic, albeit more cumbersome, soot oxidation cycles [ 18 , 19 , 20 , 21 ]. La loaded on CeO 2 –ZnO (five cycles) [ 21 ], K added into CeO 2 (three cycles) [ 18 ], codoping of Ag and Mn into CeO 2 (three cycles) [ 19 ], and Au-doped Ce 0.8 Zr 0.2 O 2 (three cycles) [ 20 ] all showed enhanced stability of ceria-based catalysts for soot oxidation. These studies identified that resistance of sintering and crystal growth, ability of CO 2 desorption, and oxygen-species replenishment play important roles regarding catalyst stability in soot oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Surface Properties of Nanostructured Ceria-Based Catalysts on Their Stability Performance

Croiset

Wen

2022

Nanomaterials

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As the poor cycling stability of CeO2 catalysts has become the major obstacle for applications of diesel particulate filters (DPF), it is necessary to investigate how to reduce their structural and compositional changes during soot oxidation. In this study, different ratios of Samarium (Sm) were doped into the lattice of CeO2 nanoparticles to improve the catalytic performance as well as surface properties. The stability was investigated by recycling the catalyst, mixing it with soot again, and repeating the thermogravimetric analysis (TGA) tests seven times. Consistent observations were expected for more cycles. It was found that doping 5%, 10%, and 20% samarium into the CeO2 lattice can improve the catalyst stability but at the cost of losing some activity. While the catalyst became more stable with the increasing Sm doping, the 10% Sm-doped catalyst showed the best compromise between stability and activity. Ce3+ and Oα were found to play important roles in controlling catalytic soot oxidation activity. These two species were directly related to oxygen vacancies and oxygen storage capacity of the catalyst. Sm-doped catalysts showed a minimized decrease in the Ce3+ and Oα content when the fresh and spent catalysts were compared.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Surface Properties of Nanostructured Ceria-Based Catalysts on Their Stability Performance

Croiset

Wen

2022

Nanomaterials

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“…Air pollution from the emissions of diesel vehicles, such as particulate matter (PM) and nitrogen oxides (NOx), has been caused harm to human health [1]. There are many technologies to reduce the pollution such as using the biodiesel as fuel in diesel engine, and installation of exhaust gas after-treatment system.…”

Section: Introductionmentioning

confidence: 99%

“…There are many technologies to reduce the pollution such as using the biodiesel as fuel in diesel engine, and installation of exhaust gas after-treatment system. The diesel engine used biodiesel as fuel that it showed low emission such as hydrocarbon, carbon monoxide, smoke [2].Currently, diesel particulate filter (DPF) is the device used to control effectively PM emissions [1,[3][4]. The operating of DPF consists of two sequential processes, which are trapping of soot and regeneration.…”

Section: Introductionmentioning

confidence: 99%

Soot Oxidation in Diesel Exhaust on Silver Catalyst Supported by Alumina, Titanium and Zirconium

Promhuad

Sawatmongkhon

2021

E3S Web Conf.

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Diesel Particulate Filter (DPF) is used to limit the emission of particulate matter (PM). The operation of DPF has two consecutive functions which are filtration of PM and regeneration. Performance of DPF is reduced by clogging of the filter. This problem is improved by soot oxidation in the regeneration process. The soot is completely oxidized by oxygen when temperature is higher than 600 °C. However, the exhaust gas temperature in normal operating of the diesel engine is lower than the temperature of soot complete oxidation. The problem of low temperature in soot oxidation is improved by oxidation catalyst because the oxidation catalyst is used to reduce light of temperature in soot oxidation. The study’s purpose is to compare the oxidation activity of silver catalyst supported on alumina (Al2O3), Titanium oxide (TiO2), and Zirconium oxide (ZrO2). The compression of soot oxidation on silver catalyst loaded on several support which showed silver base on alumina was the best of soot oxidation compared with titanium oxide and zirconium oxide. The behaviour of soot oxidation in silver base on titanium oxide and zirconium oxide were similar activity.

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“…Accordingly, a large diversity of CH 4 sensors, involving different technologies, have been developed [6]. Among them, pellistors have advantages related to the low fabrication costs and simplicity in operation, being typically used in a Wheatstone bridge arrangement where the out-of-balance voltage from the bridge is used as a signal measurement [7,8]. From the phenomenological point of view, CH 4 reduces the oxygen species from the catalytic material surface, leading to an exothermic reaction translated into the pellistor signal.…”

Section: Introductionmentioning

confidence: 99%

Methane Combustion Using Pd Deposited on CeOx-MnOx/La-Al2O3 Pellistors

Florea

Stănoiu

Gheorghe³

et al. 2020

Materials

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Pd deposited on CeOx-MnOx/La-Al2O3 has been prepared as a sensitive material for methane (CH4) detection. The effect of different amounts (1.25%, 2.5% and 5%) of Pd loading has been investigated. The as prepared materials were deposited on Pt microcoils using a drop-coating method, as a way of developing pellistors operated using a Wheatstone bridge configuration. By spanning the operating temperature range between 300 °C and 550 °C, we established the linearity region as well as the maximum sensitivity towards 4900 ppm of CH4. By making use of the sigmoid dependence of the output voltage signal from the Wheatstone bridge, the gas surface reaction and diffusion phenomena have been decoupled. The pellistor with 5% Pd deposited on CeOx-MnOx/La-Al2O3 exhibited the highest selective-sensitivity in the benefit of CH4 detection against threshold limits of carbon monoxide (CO), sulfur dioxide (SO2) and hydrogen sulfide (H2S). Accordingly, adjusting the percent of Pd makes the preparation strategies of pellistors good candidates towards CH4 detection.

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Oxidative reactivity enhancement for soot combustion catalysts by co-doping silver and manganese in ceria

Cited by 41 publications

References 59 publications

Influence of Surface Properties of Nanostructured Ceria-Based Catalysts on Their Stability Performance

Influence of Surface Properties of Nanostructured Ceria-Based Catalysts on Their Stability Performance

Soot Oxidation in Diesel Exhaust on Silver Catalyst Supported by Alumina, Titanium and Zirconium

Methane Combustion Using Pd Deposited on CeOx-MnOx/La-Al2O3 Pellistors

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