In:
Progress in Reaction Kinetics and Mechanism, SAGE Publications, Vol. 42, No. 1 ( 2017-02), p. 14-22
Kurzfassung:
Pt-promoted S 2 O 8 2– /ZrO 2 –Al 2 O 3 (SZA) catalysts were successfully prepared by the microemulsion (Pt-SZA-M) and impregnation (Pt-SZA-I) methods. The effects of the preparation parameters (surfactant-to-oil ratio, surfactant-to-cosurfactant ratio, types of cosurfactant and oil phase, etc.) on the catalytic activity of Pt-SZA-M catalysts in the isomerisation of n-pentane were investigated. The results showed that the optimal catalyst preparation conditions were: a cetyltrimethylammonium bromide (CTAB)/ n-butanol mass ratio of 4:6, a (CTAB + n-butanol)/cyclohexane mass ratio of 3:7, a content of H 2 PtCl 6 solution in microemulsion of 3.6 wt% and a N 2 H 5 OH/H 2 PtCl 6 molar ratio of 25:1. A comparison of the isopentane yield for Pt-SZA-M with that for Pt-SZA-I was also performed. The results showed that the microemulsion method led to smaller and more uniform Pt particles (4.5 nm) on the SZA. In comparison with Pt-SZA-I, the isopentane yield for Pt-SZA-M was increased by 13.5% at 180 °C, showing the catalytic performance of Pt-SZA-M at lower temperature was improved significantly. At a reaction temperature of 230 °C, a pressure of 2.0 MPa, a hydrogen/ n-pentane molar ratio of 4:1 and a weight hourly space velocity of 1.0 h −1 , the yield of isopentane for Pt-SZA-M reached 60.8%.
Materialart:
Online-Ressource
ISSN:
1468-6783
,
1471-406X
DOI:
10.3184/146867816X14727370619349
Sprache:
Englisch
Verlag:
SAGE Publications
Publikationsdatum:
2017
ZDB Id:
2018085-8
Permalink