The effect of H 2 treatment at 423–573 K on the structure and synergistic activity of Pd–Cu alloy catalysts for low-temperature CO oxidation

Николаев, С. А.; Голубина, Е. В.; Шилина, М. И.

doi:10.1016/j.apcatb.2017.02.038

Cited by 36 publications

(23 citation statements)

References 54 publications

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“…This temperature is lower than those for the monometallic Ni/Al 2 O 3 and even for Pd/Al 2 O 3 LED catalysts with the same metal loadings, as well as for conventional Pd/Al 2 O 3 catalysts with three orders of magnitude higher palladium loading. [40] The higher light-off temperatures were observed for catalysts on Sibunit support (Figure 4). The Ni/Sibunit catalysts showed the lowest activity: T 10 was 350°C, and at 450°C the CO conversion was only 30 %.…”

Section: Samplementioning

confidence: 90%

“…For example, at the stoichiometric reaction conditions the temperature of 10 % CO conversion (T 10 ) on the 0.6 %Pd/Al 2 O 3 catalyst prepared by deposition-precipitation was in the range of 175-192°C depending on the catalyst pretreatment and Pd particle size. [40] Ni/Al 2 O 3 catalysts prepared by impregnation were inactive in CO oxidation under these conditions. [41] Stoichiometric CO/O 2 mixture (2 vol.% CO, 1 vol.% O 2 , He balance) was used for testing mono-and bimetallic Ni and Pd LED catalysts with 0.005 wt% metal loading.…”

Section: Co Oxidation With Oxygen On Mono-and Bimetallic Nipd Catalystsmentioning

confidence: 93%

“…Earlier bimetallic CuPd/Al 2 O 3 and NiAu/Al 2 O 3 , catalysts synthesized by conventional impregnation and ion exchange methods were tested in CO oxidation using the same stoichiometric CO/O 2 mixture. [40,41] Table 4 shows the comparison of TOF values for LED catalysts synthesized in our work with the literature data. TOF values were calculated at 250°C in accordance with equation based on Basset-Habshood kinetics.…”

Section: Samplementioning

confidence: 99%

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Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

et al. 2020

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One‐stage size‐selective method of laser electrodispersion (LED) was used to produce nanostructured NiPd, NiMo and NiW coatings on the surface of alumina, HOPG and Sibunit for the catalytic application. The deposition of nanoparticles produced by LED of bimetallic targets from alloyed or pressed metal powders provides the uniform distribution of both metals on the outer support surface; the metal ratio is similar to that in the original target. The catalytic behaviour of produced “core‐shell” catalysts in comparison with monometallic analogues was tested in two model reactions: the CO oxidation with oxygen on NiPd catalysts supported on alumina and Sibunit; and thiophene oxidation with hydrogen peroxide on NiMo and NiW alumina supported catalysts. Novel LED bimetallic catalysts with extremely low metal content (0.005 %) were superior in terms of activity and stability to monometallic ones and the catalysts obtained by “wet” chemistry methods. Improved catalytic properties of bimetallic LED catalysts are related to the high density of single nanoparticles and the formation of active metal‐oxide interfaces on the support surface.

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Section: Samplementioning

confidence: 90%

Section: Co Oxidation With Oxygen On Mono-and Bimetallic Nipd Catalystsmentioning

confidence: 93%

Section: Samplementioning

confidence: 99%

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Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

et al. 2020

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“…[1,2] Nevertheless, there are still some inevitable disadvantages that need to be overcome,s uch as the requirement of ah igh temperature (300-400 8C) to catalyze the exhaust gas at nearly 100 %c onversion, ai nhomogeneous distribution of active species, and an increasingly high cost. [1,2] Nevertheless, there are still some inevitable disadvantages that need to be overcome,s uch as the requirement of ah igh temperature (300-400 8C) to catalyze the exhaust gas at nearly 100 %c onversion, ai nhomogeneous distribution of active species, and an increasingly high cost.…”

Section: Introductionmentioning

confidence: 99%

“…The three-component catalyst Pt-Pd-Rh has been used widely as ac ommercial catalysti na utomotive exhaustg as after-treatment as it exhibits ah igh catalytic activity for automobile ex-haust gas (NO x ,C O, and hydrocarbons). [1,2] Nevertheless, there are still some inevitable disadvantages that need to be overcome,s uch as the requirement of ah igh temperature (300-400 8C) to catalyze the exhaust gas at nearly 100 %c onversion, ai nhomogeneous distribution of active species, and an increasingly high cost. In this regard, it is extremelyu rgent to develop new nanocatalystsw ith ah igh catalytic activity.T he catalytic oxidation of CO is at ypical models ystemu sed to understandh eterogeneous catalysis, therefore, as eries of transition metal (e.g.,M n, Co, Cu, Fe, Ce) oxidesa nd their mixtures have been investigated extensively for CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Zhang

et al. 2018

ChemCatChem

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Herein, a facile strategy for the in situ growth of a Co3O4‐based precursor with unique hierarchical architectures oriented diagonal or perpendicular to Ni surfaces is reported. This strategy to prepare grafted ZIF‐67@Co3O4 and MOF‐199@Co3O4 precursor structures is based on a simple hydrothermal synthesis method to obtain the Co3O4 precursor and the subsequent in situ growth of ZIF‐67 and MOF‐199, respectively. The morphologies of the Co3O4 products can be tailored by controlling the solvent polarity and concentration of precipitants. CO is chosen as a probe molecule to evaluate the catalytic performance of the as‐synthesized Co3O4‐based oxide catalysts, and the structure–activity relationships are confirmed by using TEM, H2 temperature‐programmed reduction, X‐ray photoelectron spectroscopy, Raman spectroscopy and in situ Raman spectroscopy, and extended X‐ray absorption fine structure analysis. These analysis results demonstrate that irislike Co3O4 exhibits a high catalytic activity for CO oxidation and contains an abundance of surface defect sites (Co3+ species) to result in an excellent low‐temperature reducibility, oxygen vacancies and unsaturated chemical bonds on the surface. Moreover, we used in situ Raman spectroscopy to record the structural transformation of Co3O4 directly during the reaction, which confirmed that CO oxidation on the surface of Co3O4 can proceed through the Langmuir–Hinshelwood mechanism (<200 °C) and the Mars–van Krevelen mechanism (>200 °C).

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Oxidation of Carbon Monoxide on Co−Ce‐Modified ZSM‐5 Zeolites: Impact of Mixed Oxo‐Species

et al. 2020

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The main idea of the present work is the creation of new types of redox active sites by using zeolite as a matrix. Structure and catalytic activity in CO oxidation were studied for catalysts based on CoÀ Ce-modified ZSM-5 synthesized by sequential incipient wetness impregnation. Synergy of action of the two additives is observed. The most active is the catalyst with the ratio Co : Ce = 3 : 1. According to TEM, XPS, UV-vis-DRS, DRIFTS and in situ CO-reduction studies, the interaction of metals occurs in the channels of the zeolite with the formation of previously unknown joint structures in which Co III and Ce III are stabilized. Apparently, these structures are represented by mixed CoÀ Ce oxo-cations [Co x CeO y ] n + . A new absorption band at 2179 cm À 1 appearing in the DRIFT spectra of adsorbed CO is associated with mixed species. The catalytic activity in the oxidation of CO correlates with amount of these structures.[a] M.

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The effect of H 2 treatment at 423–573 K on the structure and synergistic activity of Pd–Cu alloy catalysts for low-temperature CO oxidation

Cited by 36 publications

References 54 publications

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Oxidation of Carbon Monoxide on Co−Ce‐Modified ZSM‐5 Zeolites: Impact of Mixed Oxo‐Species

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