OP-II-3

PP-III-37BENZALDEHYDE REDUCTION OVER IRON AND MANGANESEMESOPOROUS MOLECULAR SIEVES CATALYSTSKahina Lanasri 1 , Khaldoun Bachari 1,2 , Djamila Halliche 1 , and Adel Saadi 11 Laboratoire de Chimie du Gaz Naturel, Faculty of chemistry, USTHB, BP32 El-Alia,16111 Bab-Ezzouar, Algeria. E-mail address: adel_saadi@yahoo.fr2 Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques.BP 248, 16004 Algiers, AlgeriaAromatic compounds, with preferred functional groups are key in chemicalindustries, as they are intermediates for the manufacture of dye stuffs,pharmaceutical, agricultural and photographic chemicals, additives, surfactantstextile auxiliaries, chelating agents, and polymers [1]. Aromatic alcohols are generallyprepared by reduction of aromatic aldehydes, mostly by reduction with metals. In thepresent study, we report the results obtained in the gas phase reduction ofbenzaldehyde over iron-HMS-n and manganese-HMS-n (n=50, 25, 15) catalysts.The catalysts were prepared using a protocol reported by Tanev et al. [2] and theresulting precursors were dried at 100°C and calcined in air (350°C/3h). The solidswere characterized by their BET specific area, XRDiffraction and IRFT spectroscopy.The catalytic reactions were carried out in a fixed bed glass reactor with 0.2gsamples at atmospheric pressure and in the temperature range: 100°C-250°C (H 2per-reduction: 350°C).The specific area of the catalysts decreased with the metal loading and was inthe range of 800–1120 m 2 g –1 . The XRD spectra showed the characteristic bands ofthe HMS material and metal. The intensity of the peak decreased when the nickelcontent increased showing that the addition of nickel has a negative effect on thecrystallinity. The FTIR spectra of the solids showed three peaks: the first peak isattributed to the symmetrical Si-O-Si stretching vibration, the second is assigned tosymmetric stretching vibration of Si-O-M (Fe and Mn), and the third, is attributed toSiO 2 harmonic.As a general trend, the benzaldehyde reduction results showed that the steadystateconversion increased with reaction temperature (120-240°C) for all catalystsand on the other hand, the activity increased with the metal loading catalysts. Thereaction products were toluene and benzene. They resulted from two types of508