Preparation of Pt-S2O82-/ZrO2-Al2O3 Catalyst by Microemulsion Method and Its Performance for Isomerization

doi:10.3969/j.issn.0251-0790.2012.09.033

Abstract

Abstract:

Pt-S₂O₈^2-/ZrO₂-Al₂O₃(Pt-SZA-M) solid superacid catalyst was prepared by microemulsion method. The isomerization performance of catalysts prepared with the microemulsion method and dipping method was compared with n-pentane isomerization as a probe reaction. The catalysts were characterized by XRD, FTIR, BET, TG, TPR and TEM. The results showed that compared with the Pt-SZA catalyst, the Pt particles on Pt-SZA-M were smaller(4.5 nm) and more uniform; the specific surface area of Pt-SZA-M was 109.6 m²/g, which was 15.4% higher than that of Pt-SZA(95.0 m²/g). The initial reduction temperature of Pt-SZA-M was decreased by 10-20℃ compared with that of Pt-SZA, which indicated that loading Pt by microemulsion method could improve the oxidative activity of catalyst and enhance the dissociation adsorption ability of H₂ on the surface of catalyst. The activity test of isomerization performance indicated that compared to the Pt-SZA, the activity of isomerization of the Pt-SZA-M under low temperature was significant improved, at reaction temperature of 230℃, pressure of 2.0 MPa, hydrogen/hydrocarbon molar ratio of 4: 1 and weight hourly space velocity(WHSV) of 1.0 h^-1, the isopentane yield was 60.8%. The isopentane yield was stabilized in ca. 58.0% and the selectivity was higher than 95.0% within 100 h.

Key words: Solid superacid, Microemulsion, Isomerization, Pt, S₂O₈^2-, ZrO₂-Al₂O₃

CLC Number:

O643.3

TrendMD:

SONG Hua, SHI Yang, SONG Hua-Lin. Preparation of Pt-S₂O₈^2-/ZrO₂-Al₂O₃ Catalyst by Microemulsion Method and Its Performance for Isomerization[J]. Chem. J. Chinese Universities, 2012, 33(09): 2061.

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Preparation of Pt-S₂O₈^2-/ZrO₂-Al₂O₃ Catalyst by Microemulsion Method and Its Performance for Isomerization

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