* Formulated samples were previously calcined at 700 °C for 7 h applying 5 °C•min-1 heating ramp. ZSM-5 was calcined at 550 °C for 7 h applying 5 °C•min-1 heating ramp xK:yZ:zB abbreviation used for indicate the composition of formulated catalysts (mass ratio) where K stands from kaolin, Z from zeolite (ZSM-5) and B from binder (Al2Cl(OH)5). ** Formulation was not ball-milled prior the spray drying, the rest of the treatment such as calcination temperature was perceived unchanged.
With demand for gasoline and diesel expected to decline in the near future, crude-tochemicals technologies have the potential to become the most important processes in the petrochemical industry. This trend has triggered intense research into the optimization of current refining processes to maximize the production of light olefins and aromatics at the expense of fuels. Although attractive, this approach has shown certain limitations and calls for disruptive processes able to directly transform crude to chemicals in a more efficient and environmentally friendly way. Here we propose a new reactor concept consisting of a multi-zone fluidized bed (MZFB) along with a new catalyst formulation able to perform several refining steps in one single reactor vessel. The MZFB configuration allows for in situ catalyst stripping and regeneration, while the incorporation of silicon carbide during catalyst shaping via spray drying confers this new catalyst formulation with improved physical, mechanical and heat transport properties. As a result, we demonstrate that, using this reactor-catalyst combination, it is possible to achieve stable direct
The octanickel(II) cluster 2b has been synthesized from the novel ferromagnetically coupled dinickel(II) metallacryptand 1b assembled from the m-phenylene-bis(oxamate) ligand. Complex 2b exhibits a dimer-of-tetramers structure, with two oxamate-bridged propeller-shaped tetranuclear units connected through three meta-substituted phenylenediamidate bridges, giving a metallacryptand core of the meso-helicate type. Complex 2b behaves as a ferromagnetically coupled dimer of two S=2 Ni(II)4 units with appreciable magnetic anisotropy.
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