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Oxidic unsupported Ni–Mo–W catalysts were prepared from a precipitate by high-temperature hydrothermal synthesis. The catalysts were sulfided in-situ by CS2 and H2 under different sulfiding conditions. The catalytic activity and selectivity were studied in the model reactions of naphthalene hydrogenation (HYD), quinoline hydrodenitrogenation (HDN), and dibenzothiophene (DBT) hydrodesulfurization (HDS)...
A series of nickel–copper–molybdenum catalyst precursors was synthesized through chemical precipitation method, and highly loaded catalysts were prepared by mixing the precursors with alumina sol. The nickel–copper–molybdenum catalysts were tested in the hydrodesulfurization (HDS) of the model compound 4,6-dimethyldibenzothiophene (4,6-DMDBT) and fluid catalytic cracking (FCC) diesel. The catalysts...
HCCI combustion demonstrates the capability of simultaneously reducing NO x and PM emissions and having a high brake thermal efficiency. However, there are still many challenges such as combustion control to overcome before full HCCI operation can be used reliably over the full engine operation range. Recently, the HCCI-DI compound combustion concept is presented, which is a compromise to...
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