Methanol total oxidation as model reaction for the effects of different Pd content on Pd-Pt/CeO2-Al2O3-TiO2 catalysts

Guo, Yuyu; Zhang, Shen; Mu, Wentao; Li, Xingying; Li, Zhe

doi:10.1016/j.molcata.2016.11.041

Cited by 14 publications

(4 citation statements)

References 57 publications

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“…However, as the Pd content increases, the total number of active particles increases. Compared with the agglomerated active particles, more dispersed Pt and Pd active particles enter the pores of the catalyst, covering the pore structure, resulting in a decrease in the pore volume of P3 and P4 compared to P1 and P2 …”

Section: Results and Discussionmentioning

confidence: 99%

“…Compared with the agglomerated active particles, more dispersed Pt and Pd active particles enter the pores of the catalyst, covering the pore structure, resulting in a decrease in the pore volume of P3 and P4 compared to P1 and P2. 45 A larger specific surface area is generally considered to provide more active sites for catalytic reactions, which helps catalysts to adsorb reactants and enhance their catalytic activity. According to the data in Figure 3, it can be preliminarily concluded that sample P2 has the best soot catalytic activity among the four samples.…”

Section: Dft Calculationmentioning

confidence: 99%

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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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Section: Results and Discussionmentioning

confidence: 99%

Section: Dft Calculationmentioning

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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“…A reduction peak appeared in the TiO2 carrier, which corresponded to TiO2 reduction at 429 °C, indicating that the carrier itself possessed a certain catalytic activity. The addition of Pd helped decrease other oxidation processes [33]. Two reduction peaks appeared in the Pd/TiO2 catalyst, and the peak at 237 °C was attributed to the reduction of PdO.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Catalytic Oxidation of Chlorobenzene over Pd-TiO2 /Pd-Ce/TiO2 Catalysts

Liang

Zhu

et al. 2020

Catalysts

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A series of Pd-TiO2/Pd-Ce/TiO2 catalysts were prepared by an equal volume impregnation method. The effects of different Pd loadings on the catalytic activity of chlorobenzene (CB) were investigated, and the results showed that the activity of the 0.2%-0.3% Pd/TiO2 catalyst was optimal. The effect of Ce doping enhanced the catalytic activity of the 0.2% Pd-0.5% Ce/TiO2 catalyst. The characterization of the catalysts using BET, TEM, H2-TPR, and O2-TPD showed that the oxidation capacity was enhanced, and the catalytic oxidation efficiency was improved due to the addition of Ce. Ion chromatography and Gas Chromatography-Mass Spectrometer results showed that small amounts of dichlorobenzene (DCB) and trichlorobenzene (TCB) were formed during the decomposition of CB. The results also indicated that the calcination temperature greatly influenced the catalyst activity and a calcination temperature of 550 °C was the best. The concentration of CB affected its decomposition, but gas hourly space velocity had little effect. H2-TPR indicated strong metal–support interactions and increased dispersion of PdO in the presence of Ce. HRTEM data showed PdO with a characteristic spacing of 0.26 nm in both 0.2% Pd /TiO2 and 0.2% Pd-0.5% Ce/TiO2 catalysts. The average sizes of PdO nanoparticles in the 0.2% Pd/TiO2 and 0.2% Pd-0.5% Ce/TiO2 samples were 5.8 and 4.7 nm, respectively. The PdO particles were also deposited on the support and they were separated from each other in both catalysts.

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“…Moreover, the enhanced physical adsorption/chemisorption of benzene over Pt–Pd nanocrystals and the interaction between Pt species and Pd species endowed 0.2 wt% Pd–Pt (1 : 1)/10 wt% Ce/γ-Al 2 O 3 with excellent activity. Another type of CeO 2 –Al 2 O 3 –TiO 2 (CAT) supported Pd-Pt catalyst was prepared by Guo et al , 208 and the effect of Pd content on Pd–Pt catalysts was investigated. It was reported that 0.8 wt% Pd–Pt/CAT exhibited the best activity for methanol oxidation due to abundant O ads .…”

Section: Snmcs For Voc Catalytic Oxidationmentioning

confidence: 99%

Recent progress on catalysts for catalytic oxidation of volatile organic compounds: a review

Liu

Shi

et al. 2022

Catal. Sci. Technol.

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Methanol total oxidation as model reaction for the effects of different Pd content on Pd-Pt/CeO2-Al2O3-TiO2 catalysts

Cited by 14 publications

References 57 publications

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

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

Catalytic Oxidation of Chlorobenzene over Pd-TiO2 /Pd-Ce/TiO2 Catalysts

Recent progress on catalysts for catalytic oxidation of volatile organic compounds: a review

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