Catia Cannilla

Abstract: The effects of the most largely employed preparation methods (i.e . , coprecipitation with sodium bicarbonate, complexation with citric acid, gel-oxalate coprecipitation) on the structure and catalytic behaviour of Cu-Zn-Zr systems for methanol synthesis from hydrogenation of carbon dioxide have been studied. The characterization data of the dried, calcined and reduced catalysts showed that the physico-chemical properties can be controlled by varying composition and preparation method. The catalyst obtained by the gel-coprecipitation procedure showed the highest catalytic activity in the T R range 453–513 K, 3.0 MPa and 10,000 h −1 , due to a superior functionality in the CO 2 and H 2 activation. An adequate balance between metal and oxide surface sites, in correspondence of a well defined particle size, was proposed to be crucial to design active and selective catalysts for such reaction. The good performance of the gel-oxalate coprecipitated catalyst was confirmed by an endurance test (≈200 h), in which a constant and remarkable methanol space–time-yield value of 1200 g kg cat −1 h −1 at ≈10% CO 2 conversion was obtained ( T R , 513 K; P R , 3.0 MPa).

TL;DR: In this article, the authors investigated the catalytic etherification of glycerol with tert-butyl alcohol in the presence of lab-made silica supported acid catalysts.

TL;DR: In this article, a simple sol-gel based electrospinning method has been applied for the synthesis of vanadium oxide/polyvinyl acetate (V2O5/PVAC) fibers for gas sensing applications.

TL;DR: In this paper, the catalytic hydrotreatment of Kraft lignin using sulfided NiMo and CoMo catalysts on different acidic and basic supports (Al2O3, ZSM-5, activated carbon (AC) and MgO-La2O 3) was studied in the absence of a solvent.

TL;DR: A series of Cu-ZnO-ZrO 2 /H-ZSM5 multifunctional catalysts for the one-step CO 2 -to-DME hydrogenation reaction was prepared via coprecipitation of methanol catalyst precursors by means of different precipitating agents (i.e.,, sodium bicarbonate, ammonium carbonate, oxalic acid and urea) in a slurry containing dispersed zeolite particles as discussed by the authors.