New Approaches to the Synthesis of Ultralow-Palladium Automotive Emission Control Catalysts

Rostovshchikova, T. N.; Шилина, М. И.; Gurevich, S. A.; Yavsin, D. A.; Veselov, Grigory B.; Vedyagin, Aleksey A.

doi:10.1134/s001250162260019x

Cited by 4 publications

(12 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Transmission electron microscopy (TEM) studies were performed using a JEOL JEM 2100F/UHR instrument (Tokyo, Japan) with a resolution of 0.2 nm and a maximum magnification of ×106 times equipped with an energy dispersive X-ray (EDX) accessory. Each sample was prepared for TEM studies as described elsewhere [73,74].…”

Section: Characterization Of the Materialsmentioning

confidence: 99%

“…For instance, in the case of 0.12 wt.% Pd/Al 2 O 3 catalyst [15], the T 50 value in the seventh run (800 • C) was only 3 • C higher, despite the 4-fold higher content of Pd. Another catalyst described in [74] contains a 7-fold higher amount of Pd. It demonstrated catalytic performance similar to the LEDprepared sample after aging at 1000 • C (run #11).…”

Section: Catalytic Activity and Thermal Stability Of The Samplesmentioning

confidence: 99%

“…Among them, the laser electrodispersion (LED) method developed at the Ioffe Physicotechnical Institute (St. Petersburg, Russia) is an outstanding one [67]. This method allows depositing one-size nanoparticles directly on the surface of the granulated support without the use of a liquid to stabilize them [67][68][69][70][71][72][73][74]. It was shown to be applicable and effective for the synthesis of mono-and bimetallic systems of different compositions: Pd [68,73,74], Pt [69], Ni-Pd [70], Pd-Zn [71], and Pt-Co [72].…”

Section: Introductionmentioning

confidence: 99%

“…This method allows depositing one-size nanoparticles directly on the surface of the granulated support without the use of a liquid to stabilize them [67][68][69][70][71][72][73][74]. It was shown to be applicable and effective for the synthesis of mono-and bimetallic systems of different compositions: Pd [68,73,74], Pt [69], Ni-Pd [70], Pd-Zn [71], and Pt-Co [72]. Alumina, various zeolites, and carbon materials were used as support in these works.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the LED method was applied for the first time to prepare Pd-containing TWCs [74]. It has been shown that the LED-prepared catalyst exhibits superior thermal stability with regard to the reference sample prepared by the incipient wetness impregnation method.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

et al. 2023

View full text Add to dashboard Cite

Pd/Al2O3 catalyst of the “crust” type with Pd loading of 0.03 wt.% was prepared by the deposition of 2 nm Pd particles on the outer surface of the alumina support using laser electrodispersion (LED). This technique differs from a standard laser ablation into a liquid in that the formation of monodisperse nanoparticles occurs in the laser torch plasma in a vacuum. As is found, the LED-prepared catalyst surpasses Pd-containing three-way catalysts, obtained by conventional chemical synthesis, in activity and stability in CO oxidation under prompt thermal aging conditions. Thus, the LED-prepared Pd/Al2O3 catalyst showed the best thermal stability up to 1000 °C. The present research is focused on the study of the high-temperature evolution of the Pd/Al2O3 catalyst in two reaction mixtures by a set of physicochemical methods (transmission electron microscopy, X-ray photoelectron spectroscopy, and diffuse reflectance UV-vis spectroscopy). In order to follow the dispersion of the Pd nanoparticles during the thermal aging procedure, the testing reaction of ethane hydrogenolysis was also applied. The possible reasons for the high stability of LED-prepared catalysts are suggested.

show abstract

Section: Characterization Of the Materialsmentioning

confidence: 99%

Section: Catalytic Activity and Thermal Stability Of The Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

et al. 2023

View full text Add to dashboard Cite

show abstract

Total and preferential CO oxidation on low-loaded Pt-HZSM-5 zeolites modified using laser electrodispersion

et al. 2023

View full text Add to dashboard Cite

Highly Effective Pt-Co/ZSM-5 Catalysts with Low Pt Loading for Preferential CO Oxidation in H2-Rich Mixture

et al. 2023

View full text Add to dashboard Cite

New Pt-Co catalysts of hydrogen purification from CO impurities for fuel cells were fabricated via the deposition of monodispersed 1.7 nm Pt nanoparticles using laser electrodispersion on Co-modified ZSM-5 prepared by the Co(CH3COO)2 impregnation. The structure of prepared Pt-Co zeolites was studied by low-temperature N2 sorption, TEM, EDX, and XPS methods. The comparative analysis of samples with different Pt (0.01–0.05 wt.%) and Co (2.5–4.5 wt.%) contents on zeolites with the ratio of Si/Al = 15, 28, and 40 was performed in the CO-PROX reaction in H2-rich mixture (1%CO + 1%O2 + 49%H2 + 49%He). The synergistic catalytic action of Pt and Co on zeolite surface makes it possible to completely remove CO from a mixture with hydrogen in a wide temperature range from 50 to 150 °C; the high efficiency of designed composites with low Pt loading is maintained for a long time. The enhancement of PROX performance originates from the formation of new active sites for the CO oxidation at the Pt-Co interfaces within zeolite channels and at the surface. In terms of their activity, stability, and selectivity, such composites are significantly superior to known supported Pt-Co catalysts.

show abstract

New Approaches to the Synthesis of Ultralow-Palladium Automotive Emission Control Catalysts

Cited by 4 publications

References 47 publications

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

Studies on High-Temperature Evolution of Low-Loaded Pd Three-Way Catalysts Prepared by Laser Electrodispersion

Total and preferential CO oxidation on low-loaded Pt-HZSM-5 zeolites modified using laser electrodispersion

Highly Effective Pt-Co/ZSM-5 Catalysts with Low Pt Loading for Preferential CO Oxidation in H2-Rich Mixture

Contact Info

Product

Resources

About