Effective methodologies for efficient preparation of semicarbazones from aldehydes or ketones via milling and the subsequent regeneration of the parent carbonyls by gaseous nitrogen dioxide are described under solid-solid and gas-solid reaction conditions, respectively. These methods are fast, simple and environmentally benign which do not require the use of any auxiliaries such as catalyst...

A model including detailed gas phase chemistry previously applied to nitrate ester and nitramine solid propellants and their major ingredients has been successfully applied to the pure energetic ingredient nitroguanidine and to M30, a triple base propellant which contains nitroguanidine. This is the first modeling of either based on a detailed gas phase mechanism. Computed burning rates are in ...

In physical adsorption the interaction of adsorbed molecules with solids is mainly due to induction forces acting between the surface electric field and permanent or induced dipoles in the adsorbate, and to L O N D O N dispersion forces, these prevailing, for example, in adsorption of apolar molecules In the last years it has been shown that the dielectric behaviour of the heterogeneous adsorbe...

Converting CO2 into high-value fuels and chemicals by renewable-electricity-powered electrochemical reduction reaction (CRR) is a viable approach toward carbon-emissions-neutral processes. Unlike the thermocatalytic hydrogenation of at solid-gas interface, CRR takes place three-phase gas/solid/liquid interface near electrode surface in aqueous solution, which leads to major challenges including...

Heterogeneous chemical looping combustion (CLC) reactions and conjugate transports in large oxygen carrier particles were numerically investigated with computational fluid dynamics (CFD) approaches, which a simplified noncatalytic reaction model was implemented for reducing intraparticle modelling computation. Volumic gas-solid treated as surface based on the equivalent internal particle model....

The main advantage of a fluidized bed is its capability in excellent gas-fuel mixing. However, due to the lacks of gas radial momentum, its lateral mixing of gas-solid is not adequate. Therefore, this research is focused on fluidized bed hydrodynamics enhancement using the modified gas distributor plate design. For getting an optimum fluidized bed hydrodynamics prediction, three different class...

background: iodine-123 (123i) is regarded as one of the best radionuclides for in vivo medical studies using single-photon emission computed tomography (spect) due to its suitable physical property. materials and methods: to design a new system in order to replace cryogenically solidified xenon target by the gas one, some necessary calculations are needed to be done such as finding the excitati...