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Preparation of solid acid SO42-/SiO2-TiO2 and its catalytic activity for esterification
Zhang Qi; Chang Jie; Wang Tiejun; Xu Ying
AbstractSolid acid catalysts SO42-/SiO2-TiO2 with different SiO2/TiO2 ratios and calcined at different temperatures were prepared by mechanical mixing and impregnation methods. The catalysts were used for esterification of ethanol and acetic acid. SO42-/40 % SiO2-TiO2 prepared by mechanical mixing and calcination at 400 degrees C exhibited the highest activity, and the acetic acid conversion was nearly 100 % in partial reflux rectifying esterification and up to 84% in total reflux esterification, which was close to the chemical equilibrium composition. X-ray diffraction patterns indicated that SiO2 inhibited the excessive formation of titanium oxide sulfate. The combination of tetragonal crystal anatase TiO2, orthorhombic crystal titanium oxide sulfate, and cubic crystal titanium with high surface area SiO2 ensured the high activity of the catalysts. Infrared spectra showed that the addition of SiO2 helped the formation of Ti-O-Si linkage which enhanced the strong bonding of SO42- with the catalyst surface. The sulfate species bonded were in bidentately chelating and covalent sulfate structures. Thermogravimetric-differential scanning calorimetry proved that SO42- was hardly removed with the addition of SiO2 and the temperature for transformation of anatase to rutile was lowered.
KeywordSulfuric Acid Silica Titania Solid Acid Catalyst Bio-oil Acetic Acid Ethanol Esterification
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS Subject ExtendedChemistry ; Engineering
Indexed BySCI
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS IDWOS:000242869300020
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Zhang Qi,Chang Jie,Wang Tiejun,et al. Preparation of solid acid SO42-/SiO2-TiO2 and its catalytic activity for esterification[J]. CHINESE JOURNAL OF CATALYSIS,2006,27(11):1033-1038.
APA Zhang Qi,Chang Jie,Wang Tiejun,&Xu Ying.(2006).Preparation of solid acid SO42-/SiO2-TiO2 and its catalytic activity for esterification.CHINESE JOURNAL OF CATALYSIS,27(11),1033-1038.
MLA Zhang Qi,et al."Preparation of solid acid SO42-/SiO2-TiO2 and its catalytic activity for esterification".CHINESE JOURNAL OF CATALYSIS 27.11(2006):1033-1038.
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