Insight into catalytic activity of K-Ce catalysts and K-Ce based mixed catalysts on diesel soot combustion

Yi, Chengcheng; Fang, Jia; Pu, Ping; Yang, Yi; Zong, Chen; Zuo, Zhengxing; Han, Zhiqiang

doi:10.1016/j.mcat.2022.112905

Cited by 4 publications

(2 citation statements)

References 65 publications

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“…2 ) (or TG-DSC), the sample carrier balance system enables the measurement of the temperature along with the mass change of the sample. The TG signal is not considered in these investigations, although TG can be used for investigations of certain catalyst 39 – 41 . The primary measurement signal ΔU provided by the thermocouples is proportional to the temperature difference ΔT between sample and reference due to the catalytic oxidation of methane and is given in µV.…”

Section: Methodsmentioning

confidence: 99%

Differential thermal analysis techniques as a tool for preliminary examination of catalyst for combustion

Yurchenko

Pernau

Engel

et al. 2023

Sci Rep

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The need for more economical catalysts for various combustion reactions is continuously driving catalyst development. We present Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC) as suitable techniques for fast examination of catalyst activity for combustion reactions. The heat of reaction ΔHr generated at the catalyst in a combustible atmosphere is the measure for estimating the capability of the catalyst. Present investigations verify the reliability of both methods for the pre-selection of catalysts for further extensive investigations. To simplify the measurements and the result evaluation, a new measurement routine is introduced which is more suitable for rapid catalyst investigation than the conventional approach. For initial investigations, oxidation of 1% methane on a cobalt oxide catalyst was used. First, DTA measurements were performed. The vessel size and the amount of catalyst are considered as factors influencing the thermal signal. Simultaneous mass spectrometry measurements were used to better understand the formation of the DTA response. Comparable DSC investigations were then conducted. Finally, the behavior of catalyst was compared with two commercial palladium/alumina catalysts using DTA and DSC. Our investigations show that DTA and DSC are powerful methods to identify potential catalysts in a fast and reproducible manner, provided that all parameters influencing the thermal signal are kept constant.

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Section: Methodsmentioning

confidence: 99%

Differential thermal analysis techniques as a tool for preliminary examination of catalyst for combustion

Yurchenko

Pernau

Engel

et al. 2023

Sci Rep

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show abstract

“…In addition, adding non-precious metal additive elements such as Ce, La, Co, Mn, Cu, K, etc. to Pt catalysts is a research hotspot for scholars. − …”

Section: Introductionmentioning

confidence: 99%

Study on the Catalytic Characteristics of Precious Metal Catalysts with Different Pt/Pd Ratios for Soot Combustion

et al. 2023

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Soot particles in engine exhaust seriously pollute the atmosphere and endanger human health. For soot oxidation, Pt and Pd precious metal catalysts are widely used and are effective. In this paper, the catalytic characteristics of catalysts with different Pt/Pd mass ratios for soot combustion were studied through X-ray diffraction, X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller analysis, scanning electron microscopy, transmission electron microscopy, the temperature-programmed oxidation reaction, and thermogravimetry. Besides, the adsorption characteristics of soot and O2 on the catalyst surface were explored by density functional theory (DFT) calculations. The research results showed that the activity of catalysts for soot oxidation from strong to weak is Pt/Pd = 10:1, Pt/Pd = 5:1, Pt/Pd = 1:0, and Pt/Pd = 1:1. XPS results showed that the concentration of oxygen vacancies in the catalyst is the highest when the Pt/Pd ratio is 10:1. The specific surface area of the catalyst increases first and then decreases with the increase of Pd content. When the Pt/Pd ratio is 10:1, the specific surface area and pore volume of the catalyst reach the maximum. The following are the DFT calculation results. With the increase of Pd content, the adsorption energy of particles on the catalyst surface decreases first and then increases. When the Pt/Pd ratio is 10:1, the adsorption of C on the catalyst surface is the strongest, and the adsorption of O2 is also strong. In addition, this surface has a strong ability to donate electrons. The theoretical simulation results are consistent with the activity test results. The research results have a guiding significance for optimizing the Pt/Pd ratio and improving the soot oxidation performance of the catalyst.

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Performance of soot oxidation by O2/NO/N2 atmosphere in various catalyst species

Yang

Fang

Meng

et al. 2023

J Therm Anal Calorim

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Insight into catalytic activity of K-Ce catalysts and K-Ce based mixed catalysts on diesel soot combustion

Cited by 4 publications

References 65 publications

Differential thermal analysis techniques as a tool for preliminary examination of catalyst for combustion

Differential thermal analysis techniques as a tool for preliminary examination of catalyst for combustion

Study on the Catalytic Characteristics of Precious Metal Catalysts with Different Pt/Pd Ratios for Soot Combustion

Performance of soot oxidation by O2/NO/N2 atmosphere in various catalyst species

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