Acetone transformation over PtSn/H[Al]ZSM5 catalysts

• Published in: Journal of molecular catalysis. A, Chemical Chemical, 2003-09, Vol.203 (1), p.277-286
• Main Authors: Morales, Ricardo, Melo, Luis, Brito, Joaquı́n, Llanos, Aura, Moronta, Delfı́n, Albornoz, Luis, Rodrı́guez, Eloy
• Format: Article
• Language: English
• Subjects: Acetone; Bifunctional monometallic and bimetallic catalysts; Catalysis; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; Methyl isobutyl ketone; PtSn/H[Al]ZSM5; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/S1381-1169(03)00367-4

The following reaction was studied, The results obtained show a sensitive variation in the catalytic properties as X Sn is varied in the series of PtSn/H[Al]ZSM5 catalysts prepared (assessed by XPS, EPR and TEM); these changes are attributed to the presence of the electronic and geometric type. A study was carried out on the reaction of acetone transformation over bifunctional monometallic (Pt/H[Al]ZSM5, Sn/H[Al]ZSM5) and bimetallic (PtSn/H[Al]ZSM5) catalysts with variation of their tin atomic fraction ( X Sn=number of Sn moles/number of Sn moles + number of Pt moles). The solids prepared were analyzed by means of X-ray diffraction (XRD), nitrogen adsorption at −196 °C, chemical analysis through inductive coupled plasma–atomic emission spectroscopy (ICP–AES) technique, energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), electronic paramagnetic resonance (EPR), transmission electronic microscopy (TEM), and by means of test reaction of toluene hydrogenation. Acetone transformation was carried out at 160 °C, under atmosphere pressure, at an acetone/hydrogen molar ratio of 3 and varying WHSV. The results obtained show a sensitive variation in the catalytic properties as X Sn is varied in the series of PtSn/H[Al]ZSM5 catalysts prepared; these changes are attributed to the presence of effects of the electronic and geometric type, which would be a consequence of the formation of a Pt–Sn alloy and probably of the phenomenon of decoration of platinum particles, which is evidenced from the evaluation of the solids by means of XPS and EPR.