co2-photoreduction-to-ch4-performance-under-concentrating-solar-light

CO<sub>2</sub> Photoreduction to CH<sub>4</sub> Performance Under Concentrating Solar Light

We demonstrate a method for the enhancement of CO2 photoreduction. As the driving force of a photocatalytic reaction is from solar light, the basic idea ...

Zhejiang University of Technology

The development of noble-metal-free heterogeneous catalysts that can realize the aerobic oxidation of C-H bonds at low temperature is a profound challenge in the catalysis community. Here we report the synthesis of a mesoporous Mn0.5Ce0.5Ox solid solution that is highly active for the selective oxidation of hydrocarbons under mild conditions (100-120 °C). Notably, the catalytic performance achieved in the oxidation of cyclohexane to cyclohexanone/cyclohexanol (100 °C, conversion: 17.7%) is superior to those by the state-of-art commercial catalysts (140-160 °C, conversion: 3-5%). The high activity can be attributed to the formation of a Mn0.5Ce0.5Ox solid solution with an ultrahigh manganese doping concentration in the CeO2 cubic fluorite lattice, leading to maximum active surface oxygens for the activation of C-H bonds and highly reducible Mn(4+) ions for the rapid migration of oxygen vacancies from the bulk to the surface. 

Mesoporous MnCeOx solid solutions for low temperature and selective oxidation of hydrocarbons.

A novel polystyrene-divinylbenzene microspheres hybridized with oxidized nanodiamonds (PS-DVB-OND) was synthesized by the method of seed swelling and polymerization. The oxidized nanodiamonds (OND) were characterized by Fourier transform infrared (FTIR) spectra, X-ray phtoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray diffraction (XRD). PS-DVB-OND particles were characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM). The result suggested that OND were successfully embedded into the polymer microspheres with the diameter of 6 ± 2 µm. Compared to polystyrene-divinylbenzene (PS-DVB) microspheres, PS-DVB-OND microspheres could tolerate higher pressure. The PS-DVB-OND microspheres were used as stationary phase of reversed-phase liquid chromatography directly and anion-exchangers after further quaternized with methylamine and 1,4-butanediol diglycidyl ether. Reversed-phase liquid chromatographic performance of PS-DVB-OND beads was investigated through separating six benzenes such as toluene, benzaldehyde, phenol, benzoic acid, 1,4-hydroquinone and methyl p-hydroxybenzoate. Inorganic anions such as F, Cl, NO, Br, NO, HPO and SO, were baseline separated on the anion exchangers of PS-DVB-OND microspheres. The result suggested that the prepared PS-DVB-OND microspheres have the potential as liquid chromatographic stationary phase under high pressure and extremely pH conditions.

Article	Year
Mesoporous MnCeOx solid solutions for low temperature and selective oxidation of hydrocarbons. Nature communications\| PubMed ID: 26469151	2015
The polystyrene-divinylbenzene stationary phase hybridized with oxidized nanodiamonds for liquid chromatography. Talanta\| PubMed ID: 29759192	2018

Qiulian Zhu

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