Cobalt doped CuMnOx catalysts for the preferential oxidation of carbon monoxide

Dey, Subhashish; Dhal, Ganesh Chandra; Прасад, Рам; Gupta, Ratneshwer

doi:10.1016/j.apsusc.2018.02.048

Cited by 84 publications

(22 citation statements)

References 30 publications

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“…The cobalt crystallite peaks in cobalt oxide particles were around 18.9, 32.3, 36.7, 42.7, and 56.2, as shown in Figure 2b. 14 The peaks in synthesized catalyst CoASGO around 18.9, 31.2, 37.4, 44.7, 59.2, and 65.2, respectively, are shown in Figure 2a. The intensity of a weak peak indicates the cobalt oxide molecules were smaller in size.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 82%

“…Therefore, the stacking phenomenon is more in synthesized catalyst due to the amino modification using APTMS shown in Figure 3b along with organometallic species introduction compared to the basal planes of pure GO shown in Figure 3c,d. 14,16,35,36 EDX analysis showed the atomic wt % of the GO, ASGO, and CoASGO. In GO, it is a cluster of both carbon and oxygen moieties with different functional groups shown in Supporting Information (Figure S4).…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

“…Of all of the various transition metals, palladium is predominantly used for this. − However, with palladium being a precious metal, high cost volatility prohibits its usage in huge quantities. Due to the search for alternative catalytic methodology, which employs a suitable transition metal first row element such as cobalt and iron transition metals which is an important approach due to its sustainability in its ecofriendly nature. − …”

Section: Introductionmentioning

confidence: 99%

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Cobalt Schiff Base Immobilized on a Graphene Nanosheet with N, O Linkage for Cross-Coupling Reaction

Anuma

Bhat

2018

Ind. Eng. Chem. Res.

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A simple and direct pathway to synthesize heterogeneous catalyst by covalently immobilizing a cobalt Schiff base complex on the surface of amino functionalized graphene oxide for the cross coupling of aryl halides and arylboronic acids is reported. The as synthesized samples were characterized using various spectroscopic techniques and thermal analysis to attain their structural and functional features. The analysis confirmed that the Co bounded to the ligand using bi(N, O) linkage and the Co Schiff base complex immobilized onto the functionalized graphene oxide through its amino moiety. The catalytic investigation confirmed the product yield up to 96.5% for the Suzuki cross coupling using gas chromatography. ICP analysis shows that the central active metal is 85% in its catalyst even after the fifth iteration. High product yield, environmentally benign, easy workup, easy filtration of catalyst, and mild reaction conditions are the main facets of this catalyst.

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Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 82%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cobalt Schiff Base Immobilized on a Graphene Nanosheet with N, O Linkage for Cross-Coupling Reaction

Anuma

Bhat

2018

Ind. Eng. Chem. Res.

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“…The interface of metal oxide and support is particular interest since Pd metal can act as a strong promoter to metal oxides for CO oxidation reaction. The kinetic data are taken under steady-state reaction conditions at the low conversion of CO, and it is not sensitive to changes in the catalyst surface morphology (Dey et al 2018;Baddour et al 1970).…”

Section: Co G ð þ→Co Ads ð4þmentioning

confidence: 99%

Highly Active Palladium Nanocatalysts for Low-Temperature Carbon Monoxide Oxidation

Dey

Dhal

2019

Polytechnica

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The noble metal catalysts are most commonly considered to be used in an automobile as a catalytic converter. Palladium (Pd) is a highly active catalyst for carbon monoxide (CO) oxidation in platinum group metals. It is very active for low-temperature CO oxidation if dispersed on suitable metal oxides and composite oxides. The oxidized Pd metal nanocatalyst has been applied more actively than the completely reduced particles. The performance of Pd oxide nanocatalysts strongly depends upon the surface structure, number of active sites and various Pd-O interactions. Palladium is an ideal catalyst not only for the automobile industry through cross-coupling reactions but also for low-temperature catalytic oxidation of CO. The Pd metal is more resistant for sulfur and potassium poisoning, and they are chemically sensitive and degraded rapidly in the presence of fuel impurities. The higher activity of Pd nanocatalyst was attributed to the small particle size and higher dispersion over Pd support. The chemisorptions of CO on Pd catalysts were studied in this review. The results obtained from this study will provide the scientific basis for the future design of Pd-based oxidation catalysts.

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“…The content order of O a /(O a + O l ) ratio was shown as follows: CuMn RC1 > CuMn RC2 > CuMn RC3 > CuMn RC4 . The presence of higher oxidation state phases could be the result of a greater degree of surface interaction between the easily oxidisable manganese phase and highly reducible copper phase [41]. The high amount of surface chemisorbed oxygen (most active oxygen) was more preferable for enhancing the catalytic activity for CO oxidation.…”

Section: Identification and Quantification Of Elementsmentioning

confidence: 99%

The choice of precursors in the synthesizing of CuMnOx catalysts for maximizing CO oxidation

2018

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The hopcalite (CuMnOx) catalyst is a well-known catalyst for CO oxidation at a low temperature and it is synthesized by the co-precipitation method with different types of precursors. Activity of the CuMnOx catalysts for CO oxidation is strongly dependent upon the combination of precursors, ranking in order {Mn(Ac) 2 + Cu(NO 3 ) 2 } > {Mn(Ac) 2 + Cu(Ac) 2 } > {Mn(N O 3 ) 2 + Cu(NO 3 ) 2 } > {Mn(NO 3 ) 2 + Cu(AC) 2 }. All the precursors were precipitated by KMnO 4 solution and the precursors mostly comprised of MnO 2 , Mn 2 O 3 and CuO phases. Keeping the same precipitant while changing the precursors caused a change in the lattice oxygen mobility which influenced the CO oxidation activity. The calcination strategy of the precursors has great influence on the activity of resulting catalysts. The reactive calcination (RC) conditions produce multifarious phenomena of CO oxidation and the precursor decomposition in a single-step process. The activity order of the catalysts for CO oxidation was as follows: reactive calcination (RC) > flowing air > stagnant air. Therefore, we recommended that the RC route was the more appropriate calcination route for the production of highly active CuMnOx catalysts. All the catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis, X-ray photoelectron spectroscopy and scanning electron microscopy technique. The influence of precursors on the structural properties and the catalytic activity of co-precipitation derived binary CuMnOx catalysts for CO oxidation has been investigated.

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Cobalt doped CuMnOx catalysts for the preferential oxidation of carbon monoxide

Cited by 84 publications

References 30 publications

Cobalt Schiff Base Immobilized on a Graphene Nanosheet with N, O Linkage for Cross-Coupling Reaction

Cobalt Schiff Base Immobilized on a Graphene Nanosheet with N, O Linkage for Cross-Coupling Reaction

Highly Active Palladium Nanocatalysts for Low-Temperature Carbon Monoxide Oxidation

The choice of precursors in the synthesizing of CuMnOx catalysts for maximizing CO oxidation

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