Phase formation study of noble metal (Au, Ag and Pd) doped lanthanum perovskites synthesized by hydrothermal method

Nikam, Shrikant K.; Athawale, Anjali A.

doi:10.1016/j.matchemphys.2015.02.006

Cited by 16 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among these, the most stable ones (i.e., those that display the darkest green quarters) are those involving the alkali and alkaline earth elements (i.e., K, Rb, Cs, Ca, Sr, Ba). Indeed, all these findings are entirely consistent with available experimental evidence for both La − and Mn , site doping. We note though that K, Rb and Cs have not been considered in experimental work in the past, and hence, constitute new dopants identified by this study.…”

Section: Resultssupporting

confidence: 89%

Dopants in Lanthanum Manganite: Insights from First-Principles Chemical Space Exploration

et al. 2016

View full text Add to dashboard Cite

The dopant chemical space in LaMnO3 (LMO) is systematically explored using first-principles computations. We study a range of cationic dopants including alkali, alkaline earth metals, 3d, 4d, and 5d transition metal elements without and with an adjacent O vacancy. A linear programming approach is employed to access the energetically favorable decomposition pathway and the corresponding decomposition energy of doped LaMnO3. The decomposition energy is then used to classify the dopants for stability, site preference and tendency of O vacancy formation. We find that La site doping is more favored compared to Mn site doping. We also identify dopants previously not considered, such as K, Rb, Cs, and In, which lead to stable doped LMO and are also excellent O vacancy formers. Employing data mining techniques, we identify the dopant features that are critical to the stability of a doped oxide.

show abstract

Section: Resultssupporting

confidence: 89%

Dopants in Lanthanum Manganite: Insights from First-Principles Chemical Space Exploration

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Moreover, the crystallite sizes of La 0.5 K 0.5 MnO 3 and La 0.5 K 0.5 Mn 0.7 Ce 0.3 O 3 increased, which was attributed to the distortion of the crystal after doping. 20,21 Table 2 lists the specific surface area and pore size of LaMnO 3 , La 0.5 K 0.5 MnO 3 , and La 0.5 K 0.5 Mn 0.7 Ce 0.3 O 3 ; the larger pore size corresponds to the smaller surface area in general. LaMnO 3 has the largest surface area, 35.05 m 2 g −1 , and the pore diameter is 3.06 nm.…”

Section: Resultsmentioning

confidence: 99%

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Yang

Tian

et al. 2021

ACS Omega

View full text Add to dashboard Cite

Presently, the treatment of four-way catalysts is important for reducing pollutant emissions from diesel engine exhaust, which is a major cause of urban haze. In this study, we prepared perovskite-type catalysts via the citric acid sol−gel method. Experiment results showed that K substitution at site A in LaMnO 3 decreased the agglomeration of the catalysts effectively, increased the contact with the reaction gas, promoted the conversion of Mn 3+ → Mn 4+ , and reduced the ignition temperature of soot. Ce substitution at the B-site in La 0.5 K 0.5 MnO 3 produced a CeO 2 phase and decreased the Mn 4+ /Mn 3+ ratio to 0.49, which is conducive to improving the catalytic oxidation performance. The K and Ce co-doping had the best activation effect, which showed a low activation energy (10.87 KJ mol −1 ) and a high simultaneous removal rate of NO x (reaching 90% at 275 °C) and soot ignition at 250 °C under lean conditions.

show abstract

“…As shown in the Figure 6, the activity order of prepared catalysts was as follows: Pd/ La 0. 8 /g. According to the FTIR and H 2 -TPR analysis, ZSM-5 had more acid sites and higher reducibility than the other zeolites (NaY, MOR, and Beta).…”

Section: Effect Of Different Zeolite Supportsmentioning

confidence: 99%

“…Perovskite-type mixed metal oxides with the general formula ABO 3 had attracted attention as oxidation catalysts, because of high thermal stability, oxygen mobility and low cost [6,7]. But the light-off temperature of perovskite was higher than the noble metal catalysts, many researchers had reported that the light-off temperature of perovskite could be decreased by doping with noble metals (Pt, Pd, and Au) [8,9]. Besides that, the powder perovskites exhibit low surface areas, which inhibit the catalytic activity of the powder perovskites.…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of toluene with Pd/La_0.8Ce_0.2MnO₃ supported on different zeolites

Wang

Zhao

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Pd/La 0.8 Ce 0.2 MnO 3 catalysts supported on various kinds of zeolites (ZSM-5, MOR, NaY, and b) were prepared by incipient wetness impregnation method, and these catalysts were investigated by Brunauer-Emmett-Teller, X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy, and H 2 -temperature programmed reduction. The catalytic activity of these catalysts was tested for toluene catalytic combustion, and the support effect was investigated. It was found that the ZSM-5 is the best support than other zeolites (MOR, NaY, and b), because it processes the higher acidity and reducibility, although its specific surface area is smaller than the others. Result of XRD indicates that Pd species are highly dispersed on the surface of the catalysts, and the doping of Pd could greatly improve the activity of La 0.8 Ce 0.2 MnO 3 , the light-off and complete conversion temperature of Pd/La 0.8 Ce 0.2 MnO 3 / ZSM-5 are only 112 and 2278C, respectively. V C 2017 American Institute of Chemical Engineers Environ Prog, 37: 215-220, 2018

show abstract

Phase formation study of noble metal (Au, Ag and Pd) doped lanthanum perovskites synthesized by hydrothermal method

Cited by 16 publications

References 31 publications

Dopants in Lanthanum Manganite: Insights from First-Principles Chemical Space Exploration

Dopants in Lanthanum Manganite: Insights from First-Principles Chemical Space Exploration

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Catalytic combustion of toluene with Pd/La_0.8Ce_0.2MnO₃ supported on different zeolites

Contact Info

Product

Resources

About

Phase formation study of noble metal (Au, Ag and Pd) doped lanthanum perovskites synthesized by hydrothermal method

Cited by 16 publications

References 31 publications

Dopants in Lanthanum Manganite: Insights from First-Principles Chemical Space Exploration

Dopants in Lanthanum Manganite: Insights from First-Principles Chemical Space Exploration

Efficient Catalysts of K and Ce Co-Doped LaMnO3 for NOx–Soot Simultaneous Removal and Reaction Kinetics

Catalytic combustion of toluene with Pd/La0.8Ce0.2MnO3 supported on different zeolites

Contact Info

Product

Resources

About

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Catalytic combustion of toluene with Pd/La_0.8Ce_0.2MnO₃ supported on different zeolites