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

Generation of quantum dots at the semiconductor surface for photoreforming of biomass to CO

International audienc

METAL - IODIDE CATALYTIC SYSTEM FOR DIRECT ETHERIFICATION FROM ALDEHYDES AND / OR KETONES

A process for etherification of aldehydes and / or ketones in the presence ofa catalyst and an iodine source . In particular, a process for the synthesis of an ether compound, comprising reacting an aldehyde and / or a ketone with an alcohol , in the presence of ( i ) a metal/support heterogeneous catalyst and an iodine source , or ( ii ) a metal - iodine catalyst , in a reactor, whereby the ether compound is obtained . A catalytic system comprising a metal/support heterogeneous catalyst and an iodine source , and a process for its preparatio

Enhanced photocatalytic CH4 oxidation to formic acid on Cs stabilized phosphotungstic acid-TiO2 at ambient conditions

International audienc

Selective Deposition of Cobalt and Copper Oxides on BiVO 4 Facets for Enhancement of CO 2 Photocatalytic Reduction to Hydrocarbons

International audienc

Selective photoconversion of methane at ambient temperature over metal-nanocomposites

International audienc