Preparation of mesoporous titania solid superacid and its catalytic property

• Published in: Journal of hazardous materials Vol. 159; no. 2; pp. 204 - 209
• Main Authors: Jiang, Tingshun, Zhao, Qian, Li, Mei, Yin, Hengbo
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30-11-2008; Elsevier
• Subjects: Applied sciences; Catalysis; Catalytic property; Catalytic reactions; Cetrimonium Compounds - chemistry; Chemical engineering; Chemistry; Condensation; Cyclohexanones - chemistry; Esterification; Ethylenes - chemistry; Exact sciences and technology; General and physical chemistry; Indicators and Reagents; Mesoporous titania solid superacid; Nanosized titania solid superacid; Pentanols - chemistry; Pollution; Porosity; Reactors; Salicylic Acid - chemistry; Spectroscopy, Fourier Transform Infrared; Sulfuric Acids - chemistry; Surface Properties; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titanium - chemistry; X-Ray Diffraction; Catalytic property; Condensation; Mesoporous titania solid superacid; Esterification; Nanosized titania solid superacid; Ammonium; Catalytic reaction; Raw materials; Modeling; Physisorption; Operating conditions; Impregnation; Preparation; Superacid; Salicylates; Titanium oxide; Catalyst activity; Catalyst
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2008.02.008

Mesoporous titania (TiO
2) was synthesized by hydrothermal method using cetyltrimethyl ammonium bromide (CTAB) as a template and using anhydrous ethanol and tetra-
n-butyl titanate (TBOT) as raw materials. Mesoporous titania solid superacid and nanosized titania solid superacid catalysts were prepared by wet impregnation method. The structure and property of as-prepared samples were characterized by means of XRD, FT-IR and N
2 physical adsorption. The esterification of salicylic acid with isoamyl alcohol and the condensation of cyclohexanone with ethylene were used as model reactions to test the catalytic activities of the catalysts. On the other hand, the comparison of catalytic activities of the prepared solid superacid catalysts and the conventional liquid acid H
2SO
4 was also carried out under the same experimental conditions. The results show that the catalytic activities of the prepared solid superacid catalysts were higher than that of the conventional liquid acid H
2SO
4, and that the catalytic activity of mesoporous TiO
2 solid superacid is the highest among the three catalysts. Mesoporous TiO
2 solid superacid is a good catalyst for the synthesis of isoamyl salicylate or cyclohexanone ethylene ketal.