Tuning zeolite properties for highly efficient synthesis of propylene from methanol

Series of nanosized ZSM-5 samples is synthesized at 170 °C, 150 °C, 120 °C and 100 °C. Experimental data show that the decrease of crystallization temperature leads to significant changes in zeolite properties. Crystals synthesized at 100 °C exhibit many framework defects with lower acid sites density, strength and larger external surface area. The selectivity to light olefins and the propylene-to-ethylene ratio increases as the crystallization temperature decreases. Propylene-to-ethylene ratio above 6 with the highest selectivity to propylene of 53 % is obtained over ZSM-5 catalyst prepared at 100 °C. Stability of the nanosized zeolite in MTO is also improved compared to industrial sample with similar Si/Al ratio. This catalytic performance is a result of the decrease in the acid sites density, strength and the crystals’ size, providing shorter diffusion path and larger external surface area. The presence of structural defects and different external surface are of the crystals has been shown to play an important role in the MTO catalyst performance

In Deactivation of catalyst – can we take advantage of it?

International audienc

Self-Regeneration of Cobalt and Nickel Catalysts Promoted with Bismuth for Non-deactivating Performance in Carbon Monoxide Hydrogenation

International audienc

Selectivity shift from paraffins to α-olefins in low temperature Fischer–Tropsch synthesis in the presence of carboxylic acids

International audienc

Confinement effect on carbon nanotubes for direct synthesis of lower olefins from syngas over Bi and Pb promoted iron catalysts

International audienc

In-situ generation of Brönsted acidity from hydrogen in Pd-I catalyst for selective reductive etherification of carbonyl compounds at mild conditions

International audienc

Direct dimethyl ether synthesis from syngas on copper–zeolite hybrid catalysts with a wide range of zeolite particle sizes

International audienc

Method for amination of alcohol

A method for the amination of an alcohol comprising contacting the alcohol with NH 3 and H 2 in the presence of a catalyst is described. A method of preparing metallic ruthenium nanoparticles of controllable size and the use of metallic ruthenium nanoparticles as catalyst for the amination of an alcohol with NH 3 and furthermore are described.L'invention concerne un procédé d'amination d'un alcool consistant à mettre en contact l'alcool avec NH 3 et H 2 en présence d'un catalyseur. L'invention concerne également un procédé de préparation de nanoparticules métalliques de ruthénium de taille apte à être contrôlée et l'utilisation de nanoparticules métalliques de ruthénium en tant que catalyseur pour l'amination d'un alcool à l'aide de NH 3

Selective Oxidation of Alcohols to Carbonyl Compounds over Small Size Colloidal Ru Nanoparticles

International audienc