Citral hydrogenation over Rh and Pt catalysts supported on TiO2: Influence of the preparation and activation protocols of the catalysts

• Published in: Journal of molecular catalysis. A, Chemical Vol. 337; no. 1-2; pp. 82 - 88
• Main Authors: EKOU, Tchirioua, EKOU, Lynda, VICENTE, Aurelie, LAFAYE, Gwendoline, PRONIER, Stephane, ESPECEL, Catherine, MARECOT, Patrice
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.03.2011; Elsevier [1995, Vol. 95, n° 1-janvier 2017, vol. 426, part B]
• Subjects: Catalysis; Chemical Sciences; Chemistry; Exact sciences and technology; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Citral hydrogenation; Unsaturated alcohols; Binary compound; Pt; Transition element compounds; Alcohol; Activation; Transition metal; Aldehyde; Titania; Hydrogenation; Supported catalyst; Heterogeneous catalysis; Isopulegol; Rhodium; Platinum; Preparation; Rh; Titanium oxide; Citral; Platinoid
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2011.01.020

During citral hydrogenation, the products distribution obtained on Rh/TiO2 and Pt/TiO2 catalysts depends on their preparation and activation protocols: (i) the unsaturated alcohols (the intended products) are formed in higher quantity on samples reduced at 500 degrees C and more notably with Pt/TiO2 catalyst; (ii) samples prepared by impregnation of the metallic precursor salt in HCl medium and activated at 300 degrees C are the only ones to lead to the formation of isopulegol as by-product. On the catalysts activated at 500 degrees C, these results can be explained by the presence of the SMSI effect beneficial to hydrogenate selectively the C=O bond of citral towards unsaturated alcohols.