Ambient temperature carbon monoxide oxidation using copper manganese oxide catalysts: Effect of residual Na+ acting as catalyst poison

Mirzaei, Ali Akbar; Shaterian, Hamid Reza; Joyner, Richard W.; Stockenhuber, Michael; Taylor, Stuart Hamilton; Hutchings, Graham J.

doi:10.1016/s1566-7367(02)00231-5

Cited by 72 publications

(36 citation statements)

References 11 publications

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“…The ageing time, defined as the time between the formation of precipitate and the removal of solvent, is one of the most important factors for catalytic performance. In our previous studies [32][33][34][35][36][37][38][39][40] we demonstrated the importance of ageing time with respect to catalyst activity for the oxidation of CO by mixed copper manganese oxides and mixed copper zinc oxides. We have also studied the effect of ageing time on the performance of mixed iron cobalt oxide [41,42] and mixed cobalt manganese oxide [43] catalysts for FTS.…”

Section: Effect Of Preparation Conditionsmentioning

confidence: 89%

Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins

Mirzaei

Galavy

Beigbabaei

et al. 2007

JICS

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Cobalt cerium oxides, prepared using a co-precipitation procedure, were studied as catalysts for the conversion of synthesis gas to light olefins (C 2 -C 4 ). Specifically, we studied the effect of a range of preparation variables, including the molar ratio of the [Co]/[Ce] of the precipitation solution, ageing time and calcination temperature. In addition, the effects of supports and promoters on the catalysts' activity and selectivity and a range of reaction temperatures using synthesis gas with different H 2 /CO molar feed ratios were investigated. The catalyst containing a molar ratio of 80% Co and 20% Ce, aged for 2 h, supported with 15 wt% SiO 2 without any promoter, at an operating temperature of 450 ºC and an H 2 /CO feed ratio of 2/1 (GHSV = 4500 h -1 ), performed optimally for the conversion of synthesis gas to light olefins. The characterization of both the precursors and the calcined catalysts by powder X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller specific surface area measurements and thermal analysis methods, including TGA and DSC, show that all the preparation variables influenced the catalyst precursor structure.

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Section: Effect Of Preparation Conditionsmentioning

confidence: 89%

Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins

Mirzaei

Galavy

Beigbabaei

et al. 2007

JICS

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“…In our previous study, we demonstrated the importance of aging time with respect to catalyst activity for oxidation of CO by mixed copper manganese oxide and mixed copper zinc oxide catalysts [27][28][29][30][31][32][33][34][35] and for hydrogenation of CO by mixed of cobalt-iron oxide, cobalt-manganese oxide, and cobaltcerium oxide catalysts for Fischer-Tropsch synthesis [36][37][38][39][40]. In all of these investigations, our results have shown that the aging of the precipitates obtained by coprecipitation leads to phase changes toward the forms, which are more stable thermodynamically.…”

Section: Effect Of Aging Timementioning

confidence: 99%

Spatial Heterogeneity and Imperfect Mixing in Chemical Reactions: Visualization of Density-Driven Pattern Formation

2011

Physical Chemistry

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Iron manganese oxides are prepared using a coprecipitation procedure and studied for the conversion of synthesis gas to light olefins and C 5 + hydrocarbons. In particular, the effect of a range of preparation variables such as [Fe]/[Mn] molar ratios of the precipitation solution, pH of precipitation, temperature of precipitation, and precipitate aging times was investigated in detail. The results are interpreted in terms of the structure of the active catalyst and it has been generally concluded that the calcined catalyst (at 650• C for 6 hours) containing 50%Fe/50%Mn-on molar basis which is the most active catalyst for the conversion of synthesis gas to light olefins. The effects of different promoters and supports with loading of optimum support on the catalytic performance of catalysts are also studied. It was found that the catalyst containing 50%Fe/50%Mn/5 wt.%Al 2 O 3 is an optimum-modified catalyst. The catalytic performance of optimal catalyst has been studied in operation conditions such as a range of reaction temperatures, H 2 /CO molar feed ratios and a range of total pressures. Characterization of both precursors and calcined catalysts is carried out by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), BET specific surface area and thermal analysis methods such as TGA and DSC.

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“…The entire sample is composed of different size of particles [27]. The SEM image of the catalysts derived from calcinations of these precursors also showed significant decreases [7]. With the help of SEM image, we have obtained the morphology and size of the CuMnOx particles.…”

Section: Morphology Of Catalystsmentioning

confidence: 99%

“…The precipitant effects on the crystalline phases of the catalyst while the precursor effect on the number of catalytic active sites and both are directly related to the CO oxidation activity [6]. There are many researchers focus on doping the CuMnOx catalyst with different types of metal dopants to improve its catalytic activity [7]. The addition of gold into the CuMnOx catalyst, the rate of CO oxidation was increased, and the rate of deactivation of the catalyst was reduced [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Doping on the Performance of CuMnOx Catalyst for CO Oxidation

Dey

Dhal

Прасад

et al. 2017

Bull. Chem. React. Eng. Catal.

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The rare earth-doped CuMnOx catalysts were prepared by co-precipitation method. The CuMnOx catalyst was doped with (1.5 wt.%) CeOx, (1.0 wt.%) AgOx, and (0.5 wt.%) of AuOx by the dry deposition method. After the precipitation, filtration, and washing process, drying the sample at 110 o C for 16 hr in an oven and calcined at 300 o C temperature for 2 h in the furnace at stagnant air calcination condition. The influence of doping on the structural properties of the catalyst has enhanced the activity of the catalyst for CO oxidation. The doping of noble metals was not affected the crystal structure of the CuMnOx catalyst but changed the planar spacing, adsorption performance, and reaction performance. The catalysts were characterized by Brunauer-Emmett-Teller (BET) surface are, Scanning Electron Microscope Energy Dispersive X-ray (SEM-EDX), X-Ray Diffraction (XRD), and Fourier Transform Infra Red (FTIR) techniques. The results showed that doping metal oxides (AgOx, AuOx, and CeOx) into CuMnOx catalyst can enhance the CO adsorption ability of the catalyst which was confirmed by different types of characterization technique.

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Ambient temperature carbon monoxide oxidation using copper manganese oxide catalysts: Effect of residual Na+ acting as catalyst poison

Cited by 72 publications

References 11 publications

Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins

Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins

Spatial Heterogeneity and Imperfect Mixing in Chemical Reactions: Visualization of Density-Driven Pattern Formation

Effects of Doping on the Performance of CuMnOx Catalyst for CO Oxidation

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