MOF-808(Zr) with
the coordinated unsaturated (CUS) Zr4+ centers was synthesized
by the thermal reflux method, and a series
of Au/MOF-808(Zr) catalysts with different Au loading percentages
have been prepared by the impregnation–reduction method. The
related X-ray diffraction, Fourier transform infrared spectroscopy,
high-resolution transmission electron microscopy, X-ray photoelectron
spectroscopy, N2 adsorption–desorption, Inductively
coupled plasma-mass spectrometry, and NH3 temperature-programmed
desorption characterizations have been undertaken to understand the
structure of catalysts. The catalytic activity in CO2 with
aniline/H2 to N-methylation and N-formylation has been studied in a batch reactor. Results
show that the MOF-808(Zr) structures in catalysts are of high quality
and damage-free. The Au nanoparticles (NPs) are highly dispersed on
the surface of the MOF-808(Zr) cage with a mean size of 2–20
nm. Also, the catalysts could catalyze the conversion of CO2 with aniline/H2 to N-methylation and N-formylation products with a high efficiency. With a 3.0
wt % Au/MOF-808(Zr) catalyst, the conversion of aniline is 18.4%,
and the selectivity of N-methylaniline is 80.9% and
that of N,N-dimethylaniline is 19.1%.
The preliminary reaction mechanism and the critical role of CUS were
also studied. It is determined that H2 is adsorbed and
activated on Au NPs. CO2 is adsorbed on the CUS Zr4+ acidic sites and O2– basic sites. The
primary and secondary amines are adsorbed on the CUS Zr4+ acidic sites, where they react with CO2 and H2 to form N-formamide. Subsequently, N-formamide reacts with activated H2 to yield N-methylamine.
In practical engineering applications, the mixing and separation behavior of multi-component particles is importance to the fluidized bed operation. The development of many practical processes is inseparable from the knowledge of particle mixing and separation, such as material processing of ash-soluble coal gasification, multi-phase flow in boilers, and petrochemical catalytic processes. In recent years, due to the obvious advantages of the Eulerian–Eulerian model, many researchers at home and abroad have used it to study the mixing and separation behavior of particles. The paper reviews the use of Eulerian–Eulerian model to study the mixing and separation of multi-component particles in fluidized beds. The Eulerian–Eulerian model describes the gas-phase and each of the individual particles as continuums. The mechanism of particle mixing and separation, the influence of different factors on the particle mixing and separation including differences in particle size and density, the differences in apparent air velocity, the differences in model factors are discussed. Finally, an outlook for the use of Eulerian–Eulerian model to study the mixing and separation behavior of three component particles and related research on the drag model between particles.
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