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Data on structural and composition-related merits of gC₃N₄ nanofibres doped and undoped with Au/Pd at the atomic level for efficient catalytic CO oxidation.

ABSTRACT: Precise design of graphitic carbon nitride (gC₃N₄) nanostructures is of grand importance in different catalytic applications. This article emphasizes additional data on the fabrication of metal-free gC₃N₄ nanofibres (gC₃N₄NFs) and its associated structural and composition analysis compared with Au/Pd co-doped gC₃N₄ nanofibres (Au/Pd/gC₃N₄NFs). The data is including the typical fabrication process of metal-free gC₃N₄ nanofibers and its SEM, TEM, and element mapping analysis beside Raman, and FTIR spectra relative to Au/Pd/gC₃N₄NFs. We also investigated the catalytic CO oxidation durability testes on Au/Pd/gC₃N₄NFs compared to Pd/gC₃N₄NFs and Au/gC₃N₄NFs. The presented data are associated with the research article entitled "Rational synthesis of one-dimensional carbon nitride-based nanofibers atomically doped with Au/Pd for efficient carbon monoxide oxidation." [1].

SUBMITTER: Eid K

PROVIDER: S-EPMC6849110 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Data on structural and composition-related merits of gC3N4 nanofibres doped and undoped with Au/Pd at the atomic level for efficient catalytic CO oxidation.

Eid Kamel K Sliem Mostafa H MH Eldesoky Amal S AS Abdullah Aboubakr M AM

Data in brief 20191030

Precise design of graphitic carbon nitride (gC3N4) nanostructures is of grand importance in different catalytic applications. This article emphasizes additional data on the fabrication of metal-free gC3N4 nanofibres (gC3N4NFs) and its associated structural and composition analysis compared with Au/Pd co-doped gC3N4 nanofibres (Au/Pd/gC3N4NFs). The data is including the typical fabricatio ...[more]

PMID: 31737770

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Project description:CO elimination through oxidation over highly active and cost-effective catalysts is a way forward for many processes of industrial and environmental importance. In this study, doped CeO2 with transition metals (TM = Cu, Co, Mn, Fe, Ni, Zr, and Zn) at a level of 20 at. % was tested for CO oxidation. The oxides were prepared using microwave-assisted sol-gel synthesis to improve catalyst's performance for the reaction of interest. The effect of heteroatoms on the physicochemical properties (structure, morphology, porosity, and reducibility) of the binary oxides M-Ce-O was meticulously investigated and correlated to their CO oxidation activity. It was found that the catalytic activity (per gram basis or TOF, s-1) follows the order Cu-Ce-O > Ce-Co-O > Ni-Ce-O > Mn-Ce-O > Fe-Ce-O > Ce-Zn-O > CeO2. Participation of mobile lattice oxygen species in the CO/O2 reaction does occur, the extent of which is heteroatom-dependent. For that, state-of-the-art transient isotopic 18O-labeled experiments involving 16O/18O exchange followed by step-gas CO/Ar or CO/O2/Ar switches were used to quantify the contribution of lattice oxygen to the reaction. SSITKA-DRIFTS studies probed the formation of carbonates while validating the Mars-van Krevelen (MvK) mechanism. Scanning transmission electron microscopy-high-angle annular dark field imaging coupled with energy-dispersive spectroscopy proved that the elemental composition of dopants in the individual nanoparticle of ceria is less than their composition at a larger scale, allowing the assessment of the doping efficacy. Despite the similar structural features of the catalysts, a clear difference in the Olattice mobility was also found as well as its participation (as expressed with the α descriptor) in the reaction, following the order αCu > αCo> αMn > αZn. Kinetic studies showed that it is rather the pre-exponential (entropic) factor and not the lowering of activation energy that justifies the order of activity of the solids. DFT calculations showed that the adsorption of CO on the Cu-doped CeO2 surface is more favorable (-16.63 eV), followed by Co, Mn, Zn (-14.46, -4.90, and -4.24 eV, respectively), and pure CeO2 (-0.63 eV). Also, copper compensates almost three times more charge (0.37e-) compared to Co and Mn, ca. 0.13e- and 0.10e-, respectively, corroborating for its tendency to be reduced. Surface analysis (X-ray photoelectron spectroscopy), apart from the oxidation state of the elements, revealed a heteroatom-ceria surface interaction (Oa species) of different extents and of different populations of Oa species.

Dataset Information

Data on structural and composition-related merits of gC₃N₄ nanofibres doped and undoped with Au/Pd at the atomic level for efficient catalytic CO oxidation.

Publications

Data on structural and composition-related merits of gC<sub>3</sub>N<sub>4</sub> nanofibres doped and undoped with Au/Pd at the atomic level for efficient catalytic CO oxidation.

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