This work introduces a novel sandwich-like structured nanocatalyst, which shows a large specifi c surface area, good dispersity and enhanced synergistic eff ects between CeO 2 and noble metals. This synthetic strategy is an eff ective method for the preparation of highly effi cient sandwich-like mesoporous catalysts.We report the creation of highly efficient sandwich-like structured nanocatalysts consisting of magnetic Fe 3 O 4 cores, porous SiO 2 and CeO 2 shells and coated with noble metal nanoparticles (NMNPs). The nanocatalysts possess uniform sizes, variable shell compositions and thicknesses, adjustable noble metal nanoparticle coatings, tunable morphologies and good structural stability, and can be used as unique catalysts with extremely high catalytic activity and stability for the 4-nitrophenol reduction reaction due to their structural features with multiple interactions and strong synergistic effects between the noble metal nanoparticles and the cerium oxide shells. The designed double shelled Fe 3 O 4 @SiO 2 @CeO 2 /M nanocatalysts can be used as novel catalyst systems with highly efficient catalytic performance for various catalytic reactions depending on their shell components and noble nanoparticle coating. The synthetic strategy provides a new methodology to design high-performance and recyclable nanocatalysts.
Methyl
formate is widely employed as one of the important organic
intermediates in C1 chemistry and as an environmentally benign chemical
in the emerging area of “green chemistry”. We here study
the catalytic effectiveness of CuO/TiO2-nanotube nanocomposites
for the direct synthesis of methyl formate via methanol
photo-oxidation in this paper. The CuO/TiO2-nanotube nanocomposites
with 7% CuO weight loading give a promising photocatalytic performance
(over 93.3% methanol conversion and 89.4% methyl formate selectivity)
at 25 °C under 365 nm UV irradiation. The turnover frequency
and the apparent quantum efficiency reach up to 22.9 molmethanol gcat
–1 h–1 and 57.6%
over 7% CuO/TiO2-nanotube, respectively, which is mainly
because of the effective minimization of the recombination of photogenerated
electrons and holes by the surface ultrasmall-sized CuO particles.
Furthermore, these CuO/TiO2-nanotube nanocomposites exhibit
excellent durability and robust nature during the catalytic processes
of the methanol photo-oxidation to methyl formate. The experimental
results demonstrate the promise of the robust CuO/TiO2 nanocomposites
for efficient and green production of methyl formate, which may offer
guidelines for the design of efficient catalysts for selective alcohol
conversion to other valuable chemicals.
A new directed self-assembly strategy is developed to achieve 3D Pt/Pd nanocrystal superlattices with enhanced electrocatalytic performance for methanol oxidation reaction due to the enriched metallic Pt active sites by appropriate Pd alloying and surface nitrogen doping.
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