from first principles PP-I-1

OP-V-3RuO x -VO x /TiO 2 as Very Highly Selective Photocatalysts for the OxidativeDehydrogenation of Ethanol to AcetaldehydeSannino D., Vaiano V., Ciambelli P.University of Salerno, Department of Industrial Engineering,Via Ponte Don Melillo, 84084 Fisciano (SA), Italydsannino@unisa.itAldehydes are important products and intermediates in the field of fine chemicals. Acommonly used method for their preparation is the oxidation of the respective alcohols [1].Ru-based catalysts are well known to oxidize alcohols. The most studies are carried out inliquid phase and discontinuous reactors, so it is necessary to separate the catalyst fromreaction products after the oxidation. This operation can be avoided using a gas-solidcontinuous catalytic reactor. But generally, the gas phase process is carried out at hightemperatures resulting in low selectivity towards aldehydes. For this reason, the use of aphotocatalytic system to carry out selective oxidation of alcohols is particularly attractivebecause the reactions are often conducted at ambient temperature [2].The gas-solid photocatalytic partial oxidation of ethanol to acetaldehyde on monometallicRuO x /TiO 2 and bimetallic RuO x -VO x /TiO 2 catalysts has been studied in a fluidized bedphotoreactor at high illumination efficiency [3-5].For RuO x /TiO 2 , by increasing ruthenium loading, ethanol conversion decreased from 60 to37%, while acetaldehyde selectivity increased to about 97% (0.4 wt% RuO 2 loading). Withbimetallic RuO x -VO x /TiO 2 , the selectivity to acetaldehyde on monometallic Ru-basedcatalysts is enhanced by the highly active V species, resulting in higher catalytic performance.By increasing the vanadium loading, ethanol conversion increased up to 100 % with almosttotal selectivity to acetaldehyde.References:[1] A. Kockritz, M. Sebek, A. Dittmar, J. Radnik, A. Bruckner, U. Bentrup, M. M. Pohl , H. Hugl,W. Magerlein, J. Mol. Catal. A: Chemical 246 (2006) 85.[2] M. Nimlos, E. J . Wolfrum ,M. L . Brewer , J. A. Fennel , G, Lebintner, Environ. Sci. Technol. 30(1996), 3102. [3]S. Sato, Chem. Phys. Lett.123 (1986) 126.[3] P. Ciambelli, D. Sannino, V. Palma, V. Vaiano, PCT application, WO2009IT00239 20090529.[4] P. Ciambelli, D. Sannino, V. Palma, V. Vaiano, R. S. Mazzei, Photochem. Photobiol. Sci.10 (2011) 414.[5] V. Palma, D. Sannino, V. Vaiano, P. Ciambelli, Ind. Eng. Chem. Res. 49 (2010) 10279.85