Effect of CeO2-doping on surface and catalytic properties of CuO–ZnO system

El-Shobaky, G.A.; Hassan, Hassan M.A.; Yehia, Naema S.; Badawy, Abdelrahman A.

doi:10.1016/j.jnoncrysol.2009.09.024

Cited by 13 publications

(12 citation statements)

References 38 publications

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“…Similar results, small values of E for CO oxidation by O 2 , have been reported in case of CuO/Al 2 O 3 and CuO-ZnO/Al 2 O 3 systems (by El-Shobaky et al, 1997.…”

Section: Catalytic Activity Of Various Solidssupporting

confidence: 87%

Catalytic oxidation of CO by O₂ over nanosized CuO–ZnO system prepared under various conditions

et al. 2009

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A series of copper and zinc mixed oxides composed of equimolar ratio and treated with 0.05 Al 2 O 3 /mol catalyst has been prepared by coprecipitation method using their nitrates in presence of 1 M NaOH solution. The precipitation was carried out at a pH 9.5 and 50 • C. The results revealed that the bulk of various solids consisted of CuO and ZnO having ratios varying between 0.84 and 0.98. On the other hand, the values of surface concentrations of copper and zinc were bigger than those present in the bulk. The values of surface Cu/Zn ratio varied between 1.04 and 1.46 depending on the mode of preparation and calcination conditions. The mixed solids existed as nanocrystalline CuO and ZnO phases. The surface characteristics are strongly dependent on mode of coprecipitation and calcination temperature. The computed S BET values varied between 146 and 23 m 2 /g depending on mode of coprecipitation and calcination temperature. The increase of calcination temperature of different adsorbents within 300-400 • C led to a significant progressive decrease in the BET-surface area with subsequent increase in the values of mean pore radius. All adsorbents are mesoporous solids. All prepared solids showed a good catalytic activity in CO oxidation by O 2 , which proceeds via first order kinetics in all cases. The activation energy of the catalysed reaction was determined for various solids and the computed values were very small indicating the big catalytic activity of the investigated solids.On a préparé une série d'oxydes mixtes de cuivre et de zinc composés d'un rapportéquimolaire et traités avec un catalyseur de 0,05 Al 2 O 3 /mol par la méthode de la coprécipitation en utilisant leurs nitrates en présence de 1 M de solution de NaOH. La précipitation s'est effectuéeà un pH de 9,5 età une température de 50 • C. Les résultats ont révélé que la majeure partie de divers solides consistait en du CuO et du ZnO selon des rapports variant entre 0,84 et 0,98. D'un autre côté, les valeurs des concentrations superficielles de cuivre et de zincétaient supérieuresà celles présentes dans ce lot de solides. Les valeurs du rapport superficiel Cu/Zn variaient entre 1,04 et 1,46 selon le mode de préparation et les conditions de calcination. Les solides mixtes existaient sous forme de phases nanocrystallines du CuO et du ZnO. Les caractéristiques superficielles dépendent fortement du mode de coprécipitation et de la température de calcination. Les valeurs S BET calculées variaient entre 146 et 23 m 2 /g selon le mode de coprécipitation et la température de calcination. L'augmentation de la température de calcination de différents agents d'adsorption dans les limites de 300 et 400 • C a menéà une diminution progressive importante de l'aire superficielle BET, de même qu'une augmentation ultérieure des valeurs du rayon moyen des pores. Tous les agents d'adsorption sont des solides mésoporeux. Tous les solides préparés ont montré une bonne activité catalytique dans l'oxydation du CO par l'O 2 , qui suit une cinétique du premier ordre dans tous le...

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“…Similar results, small values of E for CO oxidation by O 2 , have been reported in case of CuO/Al 2 O 3 and CuO-ZnO/Al 2 O 3 systems (by El-Shobaky et al, 1997.…”

Section: Catalytic Activity Of Various Solidssupporting

confidence: 87%

Catalytic oxidation of CO by O₂ over nanosized CuO–ZnO system prepared under various conditions

et al. 2009

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“…EDX investigation of pure and doped solids calcined at 300–500°C was determined as the relative atomic abundance of manganese, cobalt, oxygen and zirconium species present in the uppermost surface layers of the calcined solids, which is given in Table . It is well known that the EDX technique supplies an accurate determination of relative atomic concentration of different elements present on their outermost surface layers . The bulk concentration of solids investigated was readily determined on the basis of nominal composition of these solids.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that the EDX technique supplies an accurate determination of relative atomic concentration of different elements present on their outermost surface layers. [34][35][36][37][38][39][40] The bulk concentration of solids investigated was readily determined on the basis of nominal composition of these solids. Surface and bulk compositions of various solids are given in Table 3.…”

Section: Surface Characteristics Of Various Prepared Solidsmentioning

confidence: 99%

Structural, surface and catalytic properties of pure and ZrO₂‐doped nanosized cobalt‐manganese mixed oxides

Ibrahim

Badawy²,

El-Shobaky

et al. 2013

Can J Chem Eng

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The role of ZrO2‐doping of CoO–Mn2O3 system on its structural, surface and catalytic properties was studied using XRD, EDX, nitrogen adsorption at −196°C and H2O2‐decomposition at 30–50°C. The results revealed that all solids calcined at 300–500°C consisted of nanosized Co2MnO4 as a major phase together with Co3O4 phase. The surface and bulk compositions of pure and variously doped solids were completely different from each other's. The concentration of surface manganese species was much higher than that of cobalt. The addition of the smallest amount of ZrO2 (0.75 mol%) much increased the surface concentration of manganese species. The increase of calcination temperature of all solids increased progressively the catalytic activity which increased by doping with the smallest amount of ZrO2 then decreased by doping with further amounts of ZrO2 dopant falling to values smaller than that measured for pure sample.

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“…To enhance the PH 3 adsorption capacity, modification of AC using copper oxides has been reported (2,19,(22)(23)(24). Moreover, addition of zinc and lanthanum onto copper-based activated carbon increased degree of dispersion and the stability of CuO (7,25). In this study, copper-based ACs with the addition of zinc and lanthanum were prepared to analyze the effect of preparation conditions on the PH 3 adsorption performance of AC prepared from walnut shells by KOH chemical activation.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Phosphine Adsorption of Activated Carbon Prepared from Walnut Shells by KOH Chemical Activation

Ning

et al. 2014

Separation Science and Technology

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Walnut-shell activated carbons (WSACs) with high surface area and predominant micropore development were prepared by KOH chemical activation. The effects of carbonization temperature, activation temperature, and ratio of KOH to chars on the pore development of WSACs and PH 3 adsorption performance of the modified walnut-shell activated carbons (MWSACs) were studied. Criteria for determining the optimum preparation conditions were pore development of WSACs and PH 3 breakthrough adsorption capacity of MWSAC adsorbents. The result shows that the optimum preparation conditions are a carbonization temperature of 700 • C, an activation temperature of 700 • C, and a mass ratio of 3. The BET surface area and the micropore volume of the optimal WASC are 1636m 2 /g and 0.641cm 3 /g, respectively. The micropore volume percentage of WSAC plays an important role in PH 3 adsorption when there is a slight difference in BET surface areas. High-surface-area WSACs with predominant micropores are suitable for PH 3 adsorption removal. The MWSAC adsorbent owns the biggest PH 3 breakthrough adsorption capacity (284.12mg/g) due to the biggest specific surface area, total pore volume, and micropore volume percentage. The MWSAC adsorbent will be a potential adsorbent for PH 3 adsorption removal from yellow phosphorus tail gas.

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Effect of CeO2-doping on surface and catalytic properties of CuO–ZnO system

Cited by 13 publications

References 38 publications

Catalytic oxidation of CO by O₂ over nanosized CuO–ZnO system prepared under various conditions

Catalytic oxidation of CO by O₂ over nanosized CuO–ZnO system prepared under various conditions

Structural, surface and catalytic properties of pure and ZrO₂‐doped nanosized cobalt‐manganese mixed oxides

Preparation and Phosphine Adsorption of Activated Carbon Prepared from Walnut Shells by KOH Chemical Activation

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Effect of CeO2-doping on surface and catalytic properties of CuO–ZnO system

Cited by 13 publications

References 38 publications

Catalytic oxidation of CO by O2 over nanosized CuO–ZnO system prepared under various conditions

Catalytic oxidation of CO by O2 over nanosized CuO–ZnO system prepared under various conditions

Structural, surface and catalytic properties of pure and ZrO2‐doped nanosized cobalt‐manganese mixed oxides

Preparation and Phosphine Adsorption of Activated Carbon Prepared from Walnut Shells by KOH Chemical Activation

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Catalytic oxidation of CO by O₂ over nanosized CuO–ZnO system prepared under various conditions

Catalytic oxidation of CO by O₂ over nanosized CuO–ZnO system prepared under various conditions

Structural, surface and catalytic properties of pure and ZrO₂‐doped nanosized cobalt‐manganese mixed oxides