Hydrothermally Stable Ordered Mesoporous Titanosilicates with Highly Active Catalytic Sites

AbstractPursuing and developing effective methodologies to construct highly active catalytic sites to maximize the atomic and energy efficiency by material engineering are attractive. Relative to the tremendous researches of carbon-based single atom systems, the construction of bio-applicable single atom materials is still in its infancy. Herein, we propose a facile and general interfacial-confined coordination strategy to construct high-quality single-atom nanotherapeutic agent with Fe single atoms being anchored on defective carbon dots confined in a biocompatible mesoporous silica nanoreactor. Furthermore, the efficient energy conversion capability of silica-based Fe single atoms system has been demonstrated on the basis of the exogenous physical photo irradiation and endogenous biochemical reactive oxygen species stimulus in the confined mesoporous network. More importantly, the highest photothermal conversion efficiency with the mechanism of increased electron density and narrow bandgap of this single atom structure in defective carbon was proposed by the theoretical DFT calculations. The present methodology provides a scientific paradigm to design and develop versatile single atom nanotherapeutics with adjustable metal components and tune the corresponding reactions for safe and efficient tumor therapeutic strategy.

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Anatase TiO2 nanoparticle coating on porous COK-12 platelets as highly active and reusable photocatalysts

RSC Advances ◽

10.1039/c6ra06141a ◽

2016 ◽

Vol 6 (52) ◽

pp. 46678-46685 ◽

Cited By ~ 7

Author(s):

L. H. Wee ◽

M. Meledina ◽

S. Turner ◽

K. Custers ◽

S. Kerkhofs ◽

...

Keyword(s):

Mesoporous Silica ◽

Organic Pollutants ◽

Uv Light ◽

Anatase Tio2 ◽

Light Irradiation ◽

Ordered Mesoporous Silica ◽

Nanoparticle Coating ◽

Highly Active ◽

Uv Light Irradiation ◽

Ordered Mesoporous

Coating of anatase TiO2 nanoparticles on ordered mesoporous silica COK-12 platelets for effective photodegradation of various organic pollutants under UV light irradiation.

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Atomically dispersed nickel as coke-resistant active sites for methane dry reforming

Nature Communications ◽

10.1038/s41467-019-12843-w ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 46

Author(s):

Mohcin Akri ◽

Shu Zhao ◽

Xiaoyu Li ◽

Ketao Zang ◽

Adam F. Lee ◽

...

Keyword(s):

Active Sites ◽

Large Scale ◽

Low Cost ◽

Coke Formation ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Highly Active ◽

Catalytic Sites ◽

Earth Abundant ◽

Poor Stability

AbstractDry reforming of methane (DRM) is an attractive route to utilize CO2 as a chemical feedstock with which to convert CH4 into valuable syngas and simultaneously mitigate both greenhouse gases. Ni-based DRM catalysts are promising due to their high activity and low cost, but suffer from poor stability due to coke formation which has hindered their commercialization. Herein, we report that atomically dispersed Ni single atoms, stabilized by interaction with Ce-doped hydroxyapatite, are highly active and coke-resistant catalytic sites for DRM. Experimental and computational studies reveal that isolated Ni atoms are intrinsically coke-resistant due to their unique ability to only activate the first C-H bond in CH4, thus avoiding methane deep decomposition into carbon. This discovery offers new opportunities to develop large-scale DRM processes using earth abundant catalysts.

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