The Effect of Zinc Content on n-Pentane Isomerisation Over Zn–S2O82–/ZrO2–Al2O3 Catalyst. (February 2017)

• Record Type: Journal Article
• Authors: Song, Hua; Li, Shengnan; Song, Hualin; Li, Feng; Cui, Huapeng
• Is Part Of: Progress in reaction kinetics and mechanism. Volume 42:Number 1(2017)
• Page Start: 23
• Page End: 29
• Publication Date: 2017-02
• Subjects: zinc -- n-pentane isomerisation -- solid superacid -- catalyst; Chemical kinetics -- Periodicals; 541.39405
• DOI: 10.3184/146867816X14696245116981
• Languages: English
• ISSNs: 1468-6783

Abstract

A number of Zn–S2 O8 2– /ZrO2 –Al2 O3 (Zn( x )–SZA) catalysts with different Zn mass fractions were synthesised and characterised by using X-ray diffraction, the Brunauer–Emmett–Teller method, and H2 temperature-programmed reduction. The structure and isomerisation performance of Zn( x )–SZA catalysts were studied using n -pentane as a probe reaction. The results showed that a pure tetragonal ZrO2 phase was formed on Zn( x )–SZA, and the ZrO2 crystallite sizes of the tetragonal phase increased in the order: Zn(0.5)–SZA < Zn(1.0)–SZA < Zn(1.5)–SZA < Zn(2.0)–SZA < SZA. Zn can strengthen the interaction between persulfate ions and the support, promote the formation of stronger acidity, lead to a better dispersion of sulfate ions on the surface, and improve the redox performance of the catalysts. The Zn(1.0)–SZA catalyst exhibited the best catalytic activity for n -pentane isomerisation. At a temperature of 170 °C, a reaction pressure of 2.0 MPa, a molar H2 / n -pentane ratio of 4:1, and a weight hourly space velocity of 1.0 h −1, the isopentane yield reached 58.0%.