Synthesis, Characterization, and Application in the CO Oxidation over a Copper Nanocatalyst Confined in SBA-15

García-Cuello, Vanessa S.; Giraldo, Liliana; Moreno–Piraján, Juan Carlos

doi:10.1021/je101084w

Cited by 12 publications

(13 citation statements)

References 37 publications

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“…of reaction). Moreover, the high catalytic activity of CuNi confined in SBA-15 indicates that the active sites are accessible to CNA molecules, in line with recent studies, [81][82][83][84] which also reported that confinement of NPs in ordered mesoporous silica materials induces high catalytic activity. Nevertheless, Fig.…”

Section: Hydrogen Chemisorption and Catalytic Testssupporting

confidence: 86%

Synthesis of highly thermostable copper-nickel nanoparticles confined in the channels of ordered mesoporous SBA-15 silica

et al. 2011

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CuNi nanoparticles were effectively confined in the mesopores of SBA-15 silica by a simple incipient wetness impregnation method. After impregnation, the samples were dried at room temperature, which is considered as the key preparation step to obtain high and stable dispersions of the supported CuNi nanoparticles, irrespective of the thermal conditions during the calcination and reduction steps. The catalysts were systematically characterized by powder X-ray diffraction at low and high angles, transmission electron microscopy and nitrogen physisorption, hydrogen temperature-programmed reduction, in situ XRD after temperature-programmed reduction, hydrogen chemisorption as well as by catalytic tests for the hydrogenation of cinnamaldehyde in liquid phase. Characterization revealed a strong interaction between Cu and Ni, resulting in improved reducibility as compared to either Cu or Ni monometallic materials. Moreover, the complete interdiffusion of Cu and Ni atoms to form continuous solid alloy solutions is prevented due to the stabilization of Ni by 1 : 1 nickel phyllosilicate. As a result, the bimetallic CuNi/SBA-15 materials present two distinct metallic phases, one rich in copper and another rich in nickel. At the calcination temperature of 500 C, the materials displayed the highest chemisorption capacity and highest catalytic activity, as well. Nevertheless, the chemoselectivity of supported CuNi/SBA-15 to cinnamyl alcohol or hydrocinnamaldehyde does not depend on the calcination conditions.

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Section: Hydrogen Chemisorption and Catalytic Testssupporting

confidence: 86%

Synthesis of highly thermostable copper-nickel nanoparticles confined in the channels of ordered mesoporous SBA-15 silica

et al. 2011

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“…34 The IR spectrum of the samples showed absence of CuAO stretch vibration band at 536 cm 21 . 36 The morphology of Cu on SBA-15 structure was analyzed using SEM images combined with the EDX analysis. SBA-15 and copper-containing SBA-15 samples possessed typical fiber-like morphology.…”

Section: Results and Discussion Characterizationmentioning

confidence: 99%

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

2013

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In this study, Cu-loaded Santa Barbara amorphous (SBA)-15 catalysts were synthesized by impregnation method and further used for catalytic wet peroxidation (CWPO) of pyridine from aqueous solution using hydrogen peroxide as oxidant. The synthesized catalysts have been characterized by Brunauer-Emmett-Teller surface area: temperature-programmed reduction, H 2 -chemisorption, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy. Characterization results indicate good dispersion of Cu species inside the porous structure of SBA-15. The effect of various parameters such as Cu loading on SBA-15, pH, catalyst dose, H 2 O 2 concentration, and temperature have been studied for their effect on CWPO of pyridine. More than 97% pyridine removal and 92% total organic carbon removal was achieved at optimum condition. Cu/SBA-15 showed stable performance during reuse for six cycles with negligible copper leaching.

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“…These particles have a hexagonal organization of their pores. These SBA-15 mesoporous silica nanoparticles were prepared based on reports from the scientific literature making some small changes [46][47][48]. In the synthesis carried out in this work, we used Pluronic P123 triblock as mold in acidic conditions.…”

Section: Synthesis Of Sba-15mentioning

confidence: 99%

“…The activated carbon obtained in this way was washed with double deionized water, several times, and then washed with hydrochloric acid and water (100 mL of HCl, Merck ® , Kenilworth, NJ, USA and 300 mL of double-deionized water) to remove the excess residues of activating agent and inorganic matter from the sample. Finally, a careful final wash was carried out with double deionized water until a constant pH was reached [48,49]. This sample obtained through this procedure, in this work was labeled as GACKP.…”

Section: Preparation Of Activated Carbons From Corn Cobsmentioning

confidence: 99%

Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods

2019

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This work presents the calorimetric study of five adsorbents with different chemical and textural characteristics: MOF-199, MCM-41, SBA-15, activated carbon prepared from corn cob (GACKP) and graphite. These solids were used to establish the differences between isosteric heats evaluated by three different methods: Clausius–Clapeyron (C-C), Chakraborty, Saha and Koyama (CSK) and Adsorption Calorimetry (A-Cal). The textural characterization results show solids that have values of specific surface area between 2271 m2·g−1 for the MOF-199 and 5.2 m2·g−1 for the graphite. According to the results obtained for the isosteric heats for each sample, the magnitude varies depending on the coverage of the adsorbate and the textural characteristics of each adsorbent. Solids with an organized structure have isosteric heat values that are coincident among the three methods. Meanwhile, heterogeneous solids such as activated carbon values evaluated by the CKS and C-C have a high dispersion method regarding the adsorption calorimetry method. The results obtained show that the adsorption calorimetry, being a direct experimental measurement method, presents less dispersed data. At low quantities, the isosteric heat of nitrogen adsorption decreased in the order MOF-199, GACKP, MCM-41, SBA-15 and Graphite. The order for the isosteric heats values was coherent with the surface characteristics of each of the solids, especially with the pore size distribution. Finally, throughout the coverage examined in this work, the isosteric heats for nitrogen adsorption determined by adsorption calorimetry (A-Cal) were larger than the evaluated by C-C and CSK indirect methods of vaporization. According to the results, it is shown that the adsorption calorimetry allows values of the isosteric heats of adsorption with an error of less than 2% to be established and also reveals the complex nature of the heterogeneity or homogeneity of the adsorbent.

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Synthesis, Characterization, and Application in the CO Oxidation over a Copper Nanocatalyst Confined in SBA-15

Cited by 12 publications

References 37 publications

Synthesis of highly thermostable copper-nickel nanoparticles confined in the channels of ordered mesoporous SBA-15 silica

Synthesis of highly thermostable copper-nickel nanoparticles confined in the channels of ordered mesoporous SBA-15 silica

Catalytic Activity of Cu/SBA‐15 for Peroxidation of Pyridine Bearing Wastewater at Atmospheric Condition

Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods

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