Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Franchini, Carlos A.; Llorca, Jordi; Kuznetsov, Alexei; Silva, Adriana Maria da

doi:10.1016/j.diamond.2020.108061

Cited by 5 publications

(4 citation statements)

References 45 publications

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“…The shoulder can be attributed to the decomposition of unstable groups decorating the xerogel surface as hydroxyl, epoxy, carbonyl and carboxyl groups [18]. The second stage of of the peak can be associated to the carbon lattice burning, as evidenced by similar carbon structures, whose mass spectra of the TGA effluent revealed only the presence of H 2 O and CO 2 [12]. The remaining mass detected in weigh loss profile is around of 6 % and can be ascribed to Cu oxides.…”

Section: Resultsmentioning

confidence: 98%

“…Xerogels have some special properties as high surface area, controllable pores size and chemical surface which make them appropriate to be employed as support for metallic nanoparticles [11]. The high concentration of oxygencontaining groups can act as a nucleation center or anchoring sites for the metallic particles providing an enhanced metallic dispersion and, preventing sintering [11,12]. The incorporation of oxygen groups (carboxylic anhydrides, lactones, phenol/ether and carbonyl/quinone groups) takes place during the carbonization stage [13].…”

Section: Introductionmentioning

confidence: 99%

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Study and characterization of carbon xerogels from tannin-formaldehyde system as catalyst support applications

et al. 2021

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This contribution reports the use of an organic gel, xerogel, as catalyst support for Cu. The xerogel was synthesized from the system tannin-formaldehyde at pH 3, using F-127 Pluronic as surfactant. The surface area values were higher than 900 m 2 /g even after the Cu (10%, wt) impregnation. The morphological analysis by SEM-FEG revealed the presence of spheres arranged in a tridimensional structure. XRD diffractograms showed the presence of CuO and Cu 2 O crystalline phases combined with the amorphous structure of the porous carbon. From XRD analysis it is possible to infer the Cu species are heterogeneously dispersed on the support with the co-existence of small and larger clusters, which is in agreement with Raman spectroscopy. Raman study also indicated a highly defect/disorder structure of the xerogel derivatives, ensuing the short-range structural order of the carbonic structure and oxygen groups decorating the carbon surface.XPS results corroborate with XRD and Raman results, detecting the presence of CuO and Cu 2 O. In addition to the mentioned Cu species, XPS also detected Cu 0 which may be originated from the chemical interaction between the electron oxygen groups with the Cu precursor. The high surface area and the thermal stability (~ 300 o C) of Cu/XCTF envisages its feasibly for relevant catalytic applications.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Study and characterization of carbon xerogels from tannin-formaldehyde system as catalyst support applications

et al. 2021

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“…Graphene has a high surface area and can form monolithic structures via hydrothermal green techniques in a relatively straightforward manner [15,16]. Combining metallic catalysts with graphene-based materials, such as rGO, is promising and can support highly dispersed metallic catalysts [17]. These monolithic composite structures will add a high specific surface area, low pressure drops and excellent mechanical and thermal stability compared with those of the corresponding particulate catalysts [4,12].…”

Section: Introductionmentioning

confidence: 99%

“…Sci. 2021, 11, x FOR PEER REVIEW 3 of 20 [17]. These monolithic composite structures will add a high specific surface area, low pressure drops and excellent mechanical and thermal stability compared with those of the corresponding particulate catalysts [4,12].…”

Section: Introductionmentioning

confidence: 99%

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

et al. 2021

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The monolithic materials of reduced graphene oxide (rGO) can be used successfully in CO2 adsorption. Here, the incorporation of CeO2 particles with and without polymer brushes grafted from the particles showed that the structural properties could be changed, affecting the adsorption of CO2. Polymer brushes of (1) poly(acrylic acid) (PAA), (2) poly(vinyl caprolactam) (PVCL) and (3) poly[(2-(methacryloyloxy)ethyl) trimethylammonium chloride] (PMETAC) were grafted from CeO2 via reversible addition−fragmentation chain transfer (RAFT) polymerization. The preparation of monoliths of rGO with different modified CeO2 particles led to different thermal properties (TGA), structural changes (BET isotherms) and CO2 adsorption. The responsive character of the CeO2@polymer was proven by the DLS and UV results. The responsive character of the particles incorporated into the rGO monolith affected not only the adsorption capacity but also the microstructure and values of the surface volume of the pores of the monolith. Monoliths with porosity values for better adsorption were affected by the responsive character of the polymer.

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Evaluation of Al2O3 and ZrO2 addition to reduced graphene oxide (rGO) supports and their interplay with Cu sites in the catalyst surface

Barros

Nunes

Alves

et al. 2022

Inorganic Chemistry Communications

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Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Cited by 5 publications

References 45 publications

Study and characterization of carbon xerogels from tannin-formaldehyde system as catalyst support applications

Study and characterization of carbon xerogels from tannin-formaldehyde system as catalyst support applications

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

Evaluation of Al2O3 and ZrO2 addition to reduced graphene oxide (rGO) supports and their interplay with Cu sites in the catalyst surface

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