IM-5 zeolite supported Ni nanoparticles were demonstrated to be an efficient bi-functional catalyst for the hydrodeoxygenation of anisole to cyclohexane.
In this work, we report a novel strategy to promote the industrial methanol production from CO2 hydrogenation at low pressure (12 bar) over a Pd/ZnO catalyst via introducing light irradiation into a modified continuous‐flow fixed‐bed reactor. The methanol yield was significantly enhanced by a photothermal synergistic effect and visible light was confirmed as the major contributor (>90 %) due to the localized surface plasmon resonance of Pd.
The
rational synthesis of Cu@TiO2 core@shell nanowire (NW)
structures was thoroughly explored using a microwave-assisted method
through the tuning of experimental parameters such as but not limited
to (i) controlled variation in molar ratios, (ii) the effect of discrete
Ti precursors, (iii) the method of addition of the precursors themselves,
and (iv) time of irradiation. Uniform coatings were obtained using
Cu/Ti molar ratios of 1:2, 1:1, 2:1, and 4:1, respectively. It should
be noted that although relative molar precursor concentrations primarily
determined the magnitude of the resulting shell size, the dependence
was nonlinear. Moreover, additionally important reaction parameters,
such as precursor identity, the means of addition of precursors, and
the reaction time, were individually explored with the objective of
creating a series of optimized reaction conditions. As compared with
Cu NWs alone, it is evident that both of the Cu@TiO2 core–shell
NW samples, regardless of pretreatment conditions, evinced much better
catalytic performance, up to as much as 20 times greater activity
as compared with standard Cu NWs. These results imply the significance
of the Cu/TiO2 interface in terms of promoting CO2 hydrogenation, because TiO2 alone is known to be inert
for this reaction. Furthermore, it is additionally notable that the
N2 annealing pretreatment is crucial in terms of preserving
the overall Cu@TiO2 core@shell structure. We also systematically
analyzed and tracked the structural and chemical evolution of our
catalysts before and after the CO2 reduction experiments.
Indeed, we discovered that the core@shell wire motif was essentially
maintained and conserved after this high-temperature reaction process,
thereby accentuating the thermal stability and physical robustness
of our as-prepared hierarchical motifs.
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