Potassium promoted Ru/meso-macroporous SiO2 catalyst for the preferential oxidation of CO in H2-rich gases

Niu, T.; Wang, C.X.; Zhang, L.H.; Liu, Y.

doi:10.1016/j.ijhydene.2013.03.150

Cited by 21 publications

(10 citation statements)

References 39 publications

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“…To be sure, the mesopores at 3.5nm -12.5 nm are slit-like pores ascribed from the separation of LFO and the GE sheets, the similar phenomenon was found and discussed in our previous work for GE-SiO 2 composite [17,31]. Speculatively, the BET surface areas and slit-like mesopores of the composite materials could be adjusted by regulating the content of the GE and/or the calcination temperature.…”

Section: The Results Derived From N 2 Adsorption-desorptionsupporting

confidence: 78%

Hydrothermal synthesis of graphene-LaFeO3 composite supported with Cu-Co nanocatalyst for higher alcohol synthesis from syngas

Niu

Liu

Chen

et al. 2016

Applied Surface Science

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The composite of graphene and a perovskite-type oxide (PTO) should be an attractive new material, owing to the special properties of graphene and the flexibility of PTO. Both graphene and PTO are promising support for some metallic nanoparticles. Therefore, in this work, taking LaFeO 3 as the representative for PTO, a novel composite of graphene sheets-LaFeO 3 has been prepared by using hydrothermal synthesis, and bimetallic nanoparticles of Cu-Co have been loaded on the composite. The resultant catalyst is applied to higher alcohols synthesis (HAS) from syngas. The morphology, structure and the state of the bimetallic composite catalyst are characterized by using techniques of SEM, TEM, AFM, XRD, TPR, Raman and N 2 adsorption-desorption. For the graphene-LaFeO 3 support, the graphene sheets are embedded into the bulk LaFeO 3 or uniformly deposited on the surface of the LaFeO 3 grains, resulting in high specific surface area.And the mass transferring ability of the bimetallic catalyst is optimized by uniform mixing of graphene and LaFeO 3 and the formation of the mesopores. For the active component, the Cu-Co alloy nanoparticles are highly dispersed on the graphene-LaFeO 3 composite, which leads to the high activity, high selectivity and

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Section: The Results Derived From N 2 Adsorption-desorptionsupporting

confidence: 78%

Hydrothermal synthesis of graphene-LaFeO3 composite supported with Cu-Co nanocatalyst for higher alcohol synthesis from syngas

Niu

Liu

Chen

et al. 2016

Applied Surface Science

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“…According to the kinetic study, K decreases the adsorption equilibrium constant of CO and reduces the chemisorption of CO, which promotes the chemisorption of O 2 and significantly reduces the reaction barrier between chemisorbed CO and O 2 [140]. The doping of K on Ru-based catalysts also inhibits the adsorption of CO, thus promotes the adsorption of O 2 through competitive adsorption at lower temperatures [144]. Some researchers have also proposed that the K promotes the adsorption of O 2 by changing the binding energy [145,146].…”

Section: Co Oxidationmentioning

confidence: 99%

“…K stabilizes the structure of Au on Au-based catalysts [156] and the metal state of Rh particles by the interaction between K and acidic sites on USY zeolite [157], thereby increasing the CO oxidation activity. K weakens the interaction between Ru and carrier silica, reduces the reduction stability of Ru, and keeps Ru in the state of metal Ru on Ru/SiO 2 [144] and stabilizes Cu + on Cu-based catalysts [158] through the characteristics of electron donor. K improves the dispersion, quantity and activity of active centers.…”

Section: Promotion Effects Of K On Catalyst Propertiesmentioning

confidence: 99%

“…K is considered to be served as anchor sites for Au on Au/TiO 2 catalyst [159]. K can improve the dispersion of Rh on Rh/SiO 2 [154], increase the percentage of surface active center Ru 0 on Ru/SiO 2 [144] and change the surface Rh species to form more active sites on Rh/USY [157]. K also affects the redox property of the active center.…”

Section: Promotion Effects Of K On Catalyst Propertiesmentioning

confidence: 99%

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Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

Shi

et al. 2021

Catalysts

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NOx, COx, and volatile organic compounds (VOCs) widely exist in motor vehicle exhaust, coke oven flue gas, sintering flue gas, and pelletizing flue gas. Potassium species have an excellent promotion effect on various catalytic reactions for the treatment of these pollutants. This work reviews the promotion effects of potassium species on the reaction processes, including adsorption, desorption, the pathway and selectivity of reaction, recovery of active center, and effects on the properties of catalysts, including basicity, electron donor characteristics, redox property, active center, stability, and strong metal-to support interaction. The suggestions about how to improve the promotion effects of potassium species in various catalytic reactions are put forward, which involve controlling carriers, content, preparation methods and reaction conditions. The promotion effects of different alkali metals are also compared. The article number about commonly used active metals and promotion ways are also analyzed by bibliometric on NOx, COx, and VOCs. The promotion mechanism of potassium species on various reactions is similar; therefore, the application prospect of potassium species for the coupling control of multi-pollutants in industrial flue gas at low-temperature is described.

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“…Selective oxidation can be achieved using different noble metal (Pt [5], Pd [6], Ru [7,8], Rh [9], Ir [10,11]), or transition metal-based (Cu [12,13], Co [14], Mn [15]) catalysts but gold-based catalysts are among the most intensely investigated low temperature PROX catalysts [16]. The limited capacity of gold to chemisorb hydrogen is particularly advantageous to minimize the oxidation of H 2 into water.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Au/CeO2 nanofibers: A highly accessible low-pressure drop catalyst for preferential CO oxidation

Moreno

Navascués

Irusta

et al. 2015

Journal of Catalysis

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Abstrac:Au/CeO 2 catalysts shaped as nanofibers were obtained by supporting Au nanoparticles (ca. 3nm) on CeO 2 nanofibers of around 200 nm diameter. The CeO 2 support was prepared by calcining electrospun polymer nanocomposite fibers with a high Ce content, then gold nanoparticles were either synthesized in situ or deposited from a suspension. The prepared catalysts were used in the preferential oxidation of CO in a hydrogen-rich stream. The catalysts prepared by deposition of preformed gold nanoparticles were less stable, and underwent sintering due to a weaker nanoparticle-support interaction. In contrast, the catalysts with Au nanoparticles synthesized in situ were active (90% conversion and 46% selectivity) and stable.The fiber-shaped catalyst was able to give maximum reactant access at a much lower pressure drop compared to the catalyst in powder form.2

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Potassium promoted Ru/meso-macroporous SiO2 catalyst for the preferential oxidation of CO in H2-rich gases

Cited by 21 publications

References 39 publications

Hydrothermal synthesis of graphene-LaFeO3 composite supported with Cu-Co nanocatalyst for higher alcohol synthesis from syngas

Hydrothermal synthesis of graphene-LaFeO3 composite supported with Cu-Co nanocatalyst for higher alcohol synthesis from syngas

Application Prospect of K Used for Catalytic Removal of NOx, COx, and VOCs from Industrial Flue Gas: A Review

Electrospun Au/CeO2 nanofibers: A highly accessible low-pressure drop catalyst for preferential CO oxidation

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