Nitrogen-Doped Graphene Foam as a Metal-Free Catalyst for Reduction Reactions under a High Gravity Field

Wang, Zhiyong; Zhao, Zhi‐Jian; Baucom, Jesse; Wang, Dan; Dai, Liming; Chen, Jianfeng

doi:10.1016/j.eng.2019.12.018

Cited by 32 publications

(17 citation statements)

References 39 publications

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“…In the last decade, numerous atom‐doped graphene materials (e.g., B, N, O, Si, P, S, Fe, Mo, Ag) have been experimentally synthesized, 24–26,37,38 and it is worth noting that the TM‐SADGr models have been widely reported as electrochemical reaction catalysts by DFT researches 39,40 . For the low‐temperature NO x reduction, we build models of single‐atom‐doped graphene (SADGr) by replacing a C atom with a single metal atom (Figure 1A).…”

Section: Resultsmentioning

confidence: 99%

“…Among the SACs, the single‐atom‐doped graphene (SADGr) has become one of the hotspots for the ease of access and harmlessness to the environment 21,22 . Experimentally, the SADGr materials have been reported as electrode materials and thermal reaction catalysts 23–26 . Theoretical studies based on density functional theory (DFT) simulations have demonstrated that heteroatom‐doped graphene has good adsorption/dissociation ability for NO x 27,28 .…”

Section: Introductionmentioning

confidence: 99%

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Can NO_x reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

Shi

Zhang

et al. 2021

AIChE Journal

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First principles studies combined with the microkinetic analysis were performed to study the reliability and reaction mechanisms of single‐atom‐doped graphene materials in catalyzing NOx reduction with CO. By screening the 3d transition metals (Sc‐Zn) and group IV elements (Si and Ge), it was found that the Ti‐ and Co‐doped graphene sheets (TiGr and CoGr), respectively, exhibited excellent catalytic activities in the NO/NO2‐to‐N2O and the N2O‐to‐N2 processes at a relatively low temperature (450 K). Therefore, the tandem catalyst (TiGr + CoGr) can be a promising catalyst in NOx reduction with CO. It was further revealed that the combination of adsorption energy and electronegativity was a good descriptor to predict the activation energies. The obtained results provide useful information for rational design of carbon‐based single‐atom catalysts for NOx reduction by CO at low temperatures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Can NO_x reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

Shi

Zhang

et al. 2021

AIChE Journal

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“…Hence, optimal temperature control and control of formulation is paramount to obtain a 3D foam structure with isotropic properties. Many graphene and graphene based composite 3D foam structures of various chemical binders and dispersants have been produced by FD for applications such as flexible supercapacitors, electromagnetic shielding, sensors and catalyst support [ 40 , 41 , 42 , 43 , 44 , 45 ].…”

Section: Introductionmentioning

confidence: 99%

A Facile and Scalable Approach in the Fabrication of Tailored 3D Graphene Foam via Freeze Drying

Thomas

Agarwal

2021

Materials

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One of the challenges in the processing of advanced composite materials with 2D reinforcement is their extensive agglomeration in the matrix. 3D architecture of 2D graphene sheets into a Graphene Foam (GrF) assembly has emerged as an effective way to overcome agglomeration. The highly reticulated network of branches and nodes of GrF offers a seamless pathway for photon and electron conduction in the matrix along with improved mechanical properties. 3D GrF nano-filler is often fabricated by chemical vapor deposition (CVD) technique, which demands high energy, slow deposition rate, and restricting production to small scale. This work highlights freeze-drying (FD) technique to produce 3D graphene nanoplatelets (GNP) foam with a similar hierarchical structure to the CVD GrF. The FD technique using water as the main chemical in 3D GNP foam production is an added advantage. The flexibility of the FD in producing GNP foams of various pore size and morphology is elucidated. The simplicity with which one can engineer thermodynamic conditions to tailor the pore shape and morphology is presented here by altering the GNP solid loading and mold geometry. The FD 3D GNP foam is mechanically superior to CVD GrF as it exhibited 1280 times higher elastic modulus. However, thermal diffusivity of the FD GNP foam is almost 0.5 times the thermal diffusivity of the CVD GrF due to the defects in GNP particles and pore architecture. The versatility in GNP foam scalability and compatibility to form foam of other 1D and 2D material systems (e.g., carbon nanotubes, boron nitride nanotubes, and boron nitride nanoplatelets) brings a unique dimensionality to FD as an advanced engineering foam development process.

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“…We introduced a high-gravity rotating packed bed (RPB) reactor in the premixing stage and developed a highly scalable, controllable method for CaMoO 4 production. The liquid-containing reactant is split into droplets, threads, and thin films at the microscale owing to the powerful rotation and packing under the high-gravity field inside a typical RPB reactor, 23 unlike that in a traditional stirring reactor. Consequently, the use of RPB reactors ensures high mass-transfer efficiencies with minimization of the uneven concentration distribution.…”

Section: Introductionmentioning

confidence: 99%

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

Liu

Jiao

et al. 2021

AIChE Journal

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Luminescent thermometry is a noninvasive method of temperature detection with high sensitivity and response speed. The present study demonstrated the processintensified synthesis of ytterbium and erbium codoped calcium molybdate phosphors (CaMoO 4 :Yb 3+ /Er 3+ ). The experiment involved the initial premixing of the precursors using a high-gravity rotating packed bed (RPB) reactor and subsequent calcination processing. The pronounced mass transfer and micromixing of the reactants in the RPB facilitated the scalable and controllable synthesis of CaMoO 4 :Yb 3+ /Er 3+ particles with submicron sizes and regular morphologies. The CaMoO 4 :Yb 3+ /Er 3+ particles exhibited a bright-green emission with temperature-dependent luminescence characteristics under 980 nm laser irradiation. Furthermore, the maximum absolute sensitivity was determined to be 0.02837 K À1 . These results indicated that the synthesized product was a suitable candidate for application in upconversion luminescent thermometers capable of temperature sensing at the microscale.

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Nitrogen-Doped Graphene Foam as a Metal-Free Catalyst for Reduction Reactions under a High Gravity Field

Cited by 32 publications

References 39 publications

Can NO_x reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

Can NO_x reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

A Facile and Scalable Approach in the Fabrication of Tailored 3D Graphene Foam via Freeze Drying

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

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Nitrogen-Doped Graphene Foam as a Metal-Free Catalyst for Reduction Reactions under a High Gravity Field

Cited by 32 publications

References 39 publications

Can NOx reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

Can NOx reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

A Facile and Scalable Approach in the Fabrication of Tailored 3D Graphene Foam via Freeze Drying

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

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Can NO_x reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study

Can NO_x reduction by CO react over carbon‐based single‐atom catalysts at low temperatures? A theoretical study