Ag-La loaded protonated carbon nitrides nanotubes (pCNNT) with improved charge separation in a monolithic honeycomb photoreactor for enhanced bireforming of methane (BRM) to fuels

Tahir, Beenish; Tahir, Muhammad Nawaz; Amin, Nor Aishah Saidina

doi:10.1016/j.apcatb.2019.01.076

Cited by 82 publications

(49 citation statements)

References 53 publications

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“…The bulk material consists of stacked layers forming agglomerates of some micrometers, as seen in Fig. 1a, c, and in accordance with observations reported in the literature 47,48 . The exfoliated material shows the characteristic layered-like structure with nanosheets of some hundreds of nanometers, as seen in Fig.…”

Section: Physicochemical Characterizationsupporting

confidence: 91%

Copper single-atoms embedded in 2D graphitic carbon nitride for the CO2 reduction

et al. 2021

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We report the study of two-dimensional graphitic carbon nitride (GCN) functionalized with copper single atoms as a catalyst for the reduction of CO2 (CO2RR). The correct GCN structure, as well as the adsorption sites and the coordination of the Cu atoms, was carefully determined by combining experimental techniques, such as X-ray diffraction, transmission electron microscopy, X-ray absorption, and X-ray photoemission spectroscopy, with DFT theoretical calculations. The CO2RR products in KHCO3 and phosphate buffer solutions were determined by rotating ring disk electrode measurements and confirmed by 1H-NMR and gas chromatography. Formate was the only liquid product obtained in bicarbonate solution, whereas only hydrogen was obtained in phosphate solution. Finally, we demonstrated that GCN is a promising substrate able to stabilize metal atoms, since the characterization of the Cu-GCN system after the electrochemical work did not show the aggregation of the copper atoms.

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Section: Physicochemical Characterizationsupporting

confidence: 91%

Copper single-atoms embedded in 2D graphitic carbon nitride for the CO2 reduction

et al. 2021

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“…[11] Ceria is a suitable support due to their basic properties. [12] Moreover, theThe influence of Ni loading on Ce 0.9 La 0.1 O 1.95 -supported Ni catalysts for CO 2 reduction with hydrogen (reverse water gas shift reaction) is studied. The samples are prepared by solution combustion synthesis (SCS), leading to materials with high thermal resistance, purity, and crystallinity, consisting of metallic nickel nanoparticles supported on La-doped ceria.…”

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confidence: 99%

Magnetic Properties of Efficient Catalysts Based on La‐Doped Ceria‐Supported Nickel Nanoparticles for rWGS Reaction. Influence of Ni Loading

Álvarez-Galván

Martínez

Capel-Sanchez

et al. 2021

Advanced Sustainable Systems

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to a few processes: syntheses of urea, salicylic acid, and polycarbonates, but these only correspond to a few percentage of the potential CO 2 suitable to be converted into chemicals and/or fuels. [1] Conversion of CO 2 into CO by catalytic hydrogenation has been recognized as one of the most promising processes for CO 2 utilization. Synthesis gas (syngas) could then be used to produce hydrocarbons or oxygenated hydrocarbons via Fischer-Tropsch reaction, as well as for the synthesis of methanol. This is a basic chemical for the production of synthetic fuels and polymers, whose importance is increased by the progressing shift in resources used in the petrochemical industry from crude oil to natural gas. The syngas reaction is a process in two steps, in which the first and essential is the reduction of CO 2 to CO with H 2 , or reverse water gas shift reaction (rWGS, CO 2 + H 2 ↔ CO + H 2 O), using renewable H 2 . This reaction is endothermic, being thermodynamically favored at high reaction temperatures and in excess of H 2 ; therefore, the use of an active-selective-stable catalyst under these conditions is imperative.Regarding the reaction mechanism, it has been widely reported that the reaction requires a bifunctional catalyst, consisting of a metal, which favors activation and dissociation of H 2 and a reducible oxide, promoting CO 2 adsorption and oxygen mobility in the lattice. The rate-determining step for the reaction depends on the catalyst composition and reaction conditions, being, at high temperature RWGS reaction: COO bond cleavage on Pt, Pd, and Cu, owing to the high barrier on the surfaces, while OH binding with H to form H 2 O is rate-determining on Co, Fe, Ru, Ni, and Rh. [2][3][4] Copper-based catalysts, the most studied for WGS reaction, have been also applied to the rWGS reaction; [5][6][7] however these systems are not suitable at high temperature because of their poor thermal stability. [7] As alternative, ceria-supported nickel and noble-metals catalysts have shown excellent catalytic performance in terms of activity, selectivity, and stability for RWGS reaction. [8][9][10] These supported metals present high ability for activation and dissociation of H 2 molecules, [7] being Ni preferred due to its lower prices compared to expensive noble metals. [11] Ceria is a suitable support due to their basic properties. [12] Moreover, theThe influence of Ni loading on Ce 0.9 La 0.1 O 1.95 -supported Ni catalysts for CO 2 reduction with hydrogen (reverse water gas shift reaction) is studied. The samples are prepared by solution combustion synthesis (SCS), leading to materials with high thermal resistance, purity, and crystallinity, consisting of metallic nickel nanoparticles supported on La-doped ceria. The study of the ferromagnetic Curie temperature (T C ) and magnetization cycles suggest that the Ni nanoparticles are superparamagnetic, exhibiting magnetic order at room temperature, with T C strongly dependent on the particle size; this spans from 1.9, up to 80 nm. The structural study from synchrotr...

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“…Nanostructured semiconductors with high specific surface areas are generally applied as the photocatalysts for the oxidation of CH 4 . [17][18][19][20][21] Adjusting the band gap of semiconductors by doping, defect engineering,and fabricating hybrid semiconductors is beneficial for expanding the spectral range of the absorption. [22][23][24][25][26][27] In addition, morphology control and surface modification are also able to alter the range of light absorption.…”

Section: Absorption Unitsmentioning

confidence: 99%

“…As aconsequence of this quick transfer of electrons,h ighly active electrondeficient and electron-rich sites are formed at the interface of the Rh nanoparticles and Rh/TiO 2 ,respectively.T ahir et al achieved an efficient bireforming of methane (BRM) over Ag-and La-loaded g-C 3 N 4 nanotubes (pCNNT). [18] TheA g-La loadings cause additional shoulder absorption bands in the Vis-NIR range.Furthermore,the loaded Ag interacts strongly with both pCNNT and La, which is advantageous for the dynamic transfer of photogenerated electrons from pCNNT to Ag.Shoji et al loaded Rh nanoparticles onto SrTiO 3 (Rh/ STO) to photocatalyze the partial oxidation of methane (POM). [14] TheR hn anoparticles in Rh/STO receive photogenerated electrons from SrTiO 3 to inhibit the recombination of the charge carriers.Furthermore,Rhnanoparticles absorb acertain number of photons to broaden the absorption range of Rh/STO.…”

Section: Metal/semiconductor Hybridmentioning

confidence: 99%

Photocatalytic Conversion of Methane: Recent Advancements and Prospects

Ouyang

et al. 2021

Angew Chem Int Ed

142

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Abundant and affordable methane is not only a high‐quality fossil fuel, it is also a raw material for the synthesis of value‐added chemicals. Solar‐energy‐driven conversion of methane offers a promising approach to directly transform methane to valuable energy sources under mild conditions, but remains a great challenge at present. In this Review, recent advances in the photocatalytic conversion of methane are systematically summarized. Insights into the construction of effective semiconductor‐based photocatalysts from the perspective of light‐absorption units and active centers are highlighted and discussed in detail. The performance of various photocatalysts in the conversion of methane is presented, with the photooxidation classified according to the oxidant systems. Lastly, challenges and future perspectives in the photocatalytic oxidation of methane are described.

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Ag-La loaded protonated carbon nitrides nanotubes (pCNNT) with improved charge separation in a monolithic honeycomb photoreactor for enhanced bireforming of methane (BRM) to fuels

Cited by 82 publications

References 53 publications

Copper single-atoms embedded in 2D graphitic carbon nitride for the CO2 reduction

Copper single-atoms embedded in 2D graphitic carbon nitride for the CO2 reduction

Magnetic Properties of Efficient Catalysts Based on La‐Doped Ceria‐Supported Nickel Nanoparticles for rWGS Reaction. Influence of Ni Loading

Photocatalytic Conversion of Methane: Recent Advancements and Prospects

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