Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

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

doi:10.9767/bcrec.12.3.900.437-451

Cited by 37 publications

(16 citation statements)

References 37 publications

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“…In view of this, a minor modification in the calcination process causes a notable improvement in the physicochemical properties of the catalyst. Therefore, we believe that the reduction in calcination time could affect the catalyst properties, which eventually affects their catalytic activity [21]. In the following, the calcination time is changed to 1 h, 3 h, and 5 h for the MPdA catalyst at 600 • C, which was found to yield the best results among the different calcination temperatures tested for H 12 -MBP dehydrogenation.…”

Section: Influence Of Calcination Timementioning

confidence: 99%

“…The unique properties of the MPdA catalyst were shaped by the commencement of a solvent deficient environment in the synthesis, which not only limits the nucleation and growth of nanoparticles, but also introduces the Pd and Al species into the assembly of the mesopore wall. Therefore, the above results encouraged us to further examine the MPdA catalyst by changing the calcination conditions such as temperature and time, which are known to be effective in regulating the physicochemical properties with regard to their dehydrogenation proficiencies [20,21]. Hence, the present work focuses on the investigation of the sensitivity and effectiveness of the SDP method by varying the calcination temperature and calcination time.…”

Section: Introductionmentioning

confidence: 99%

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Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

Bathula

et al. 2019

Catalysts

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A pair of 2-[(n-methylcyclohexyl)methyl]piperidine (H12-MBP) and its full dehydrogenation product (H0-MBP) has recently been considered as a potential liquid organic hydrogen carrier with 6.15 wt% H2 storage capacity. In the discovery of an active and stable catalyst for H2 discharge from H12-MBP at lower temperatures, a mesoporous Pd-Al2O3 catalyst (MPdA) was synthesized by a one-pot solvent deficient precipitation (SDP). In the present work, the sensitivity and effectiveness of the SDP method are examined by varying the calcination temperature and time in the preparation of the MPdA catalyst. The characterization revealed that the final properties of the MPdA catalyst greatly rely on both the calcination temperature and time. The MPdA catalyst showed better dehydrogenation activity for calcination at 600 °C than at other temperatures, because of Pd particles of smaller size with higher dispersion. Although the MPdA catalysts calcined at 600 °C for different periods of time have similar size and dispersion of Pd particles, the dehydrogenation efficiency was superior as the calcination time became shorter (e.g., 1 h), which originated from the better arrangement of Pd particles over a higher surface area. These MPdA catalysts, irrespective of the calcination time, displayed a remarkable stability in the dehydrogenation of H12-MBP owing to the protection of Pd particles by the Al2O3 layer.

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Section: Influence Of Calcination Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

Bathula

et al. 2019

Catalysts

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“…The presence of manganese oxide is likely to facilitate the reduction of copper oxide, involving coordination between CuO and MnO 2 , the manganese oxide acting as an oxygen donor and copper oxide acting as the oxygen acceptor. A previous work demonstrated that the presence of Cu 2+ and Mn 3+ is essential for the high catalytic activity of CuMnOx catalyst [33,34]. In present study, the different types of precursors have been used to change the crystalline phase of the catalysts and to find out the best CuMnOx catalyst, which will give the highest activity for CO oxidation.…”

Section: Introductionmentioning

confidence: 95%

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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“…The metal-support interaction may alter the catalyst properties due to its strong or low interaction. The metal-support interaction is strongly depend on few factors, such as catalyst preparation method, thermal treatment (calcination, reduction, or drying), and metal content in the catalyst [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Mardwita

Yusmartini

Wisudawati

2020

Bull. Chem. React. Eng. Catal.

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A series of alumina supported cobalt and chromium catalysts with different metal loadings were prepared by impregnation method. Six types of alumina supported cobalt and chromium catalysts contained 5 wt%, 10 wt%, and 15 wt% loadings were produced and tested in methane oxidation. The catalysts were characterized by using x-ray diffraction (XRD) and carbon monoxide chemisorption (CO chemisorption). The XRD results do not confirmed any features of cobalt and chromium metal. The metal sizes for both catalysts were larger in high loading as shown by CO chemisorption results. Methane conversion results showed that the conversion increases with increasing the metal loading, however supported chromium catalysts were higher in activities compared to supported cobalt catalysts. Thermal stability tests on 15 wt% Co/Al and 15 wt% Cr/Al catalyst showed that supported chromium catalyst is more stable and maintain the particle size due to its strong interaction with support, while supported cobalt catalyst decrease in methane conversion due to deactivation of the catalyst. Copyright © 2020 BCREC Group. All rights reserved

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Effect of Preparation Conditions on the Catalytic Activity of CuMnOx Catalysts for CO Oxidation

Cited by 37 publications

References 37 publications

Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

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

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

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