The Preparation and Characterization of Solid Superacid S₂O₈^2-/SnO₂-SiO₂

Abstract:

The new type of solid superacid S₂O₈^2-/SnO₂-SiO₂ was prepared by precipitation and hydrothermal aging method with ammonium persufate as soaker instead of sulphuric acid. The samples with different tin oxide content were characterized by FT-IR, XRD, BET, TG/DTA and Hammett indicators techniques. Catalytic activities for esterification of butanol and acetic acid were also investigated. As a result, most sulfate-ion in surface of S₂O₈^2-/SnO₂-SiO₂ coordinate with Sn bidentatly, and the acidic strength of S₂O₈^2-/SnO₂-SiO₂ is related to the content of tin oxide. Besides, introducing appropriate Si can improve the combination of the tin with SO₄^2- thus increases the amount of acid. Catalyst S₂O₈^2-/SnO₂-SiO₂ reveals high catalytic activity and stability in the esterification at very large range of composition.

• Periodical: Advanced Materials Research (Volumes 335-336)
• Pages: 212-217
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.335-336.212
• Online since: September 2011
• Authors: Xiang Ying Hao, Hai Fu Guo, Peng Yan, Xiang Li
• Keywords: Ammonium Persulfate, Esterification, Solid Superacid, TiN Oxide

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