NDLI: Hydroisomerization of n-hexane and n-heptane over platinum-promoted Cs$_{2.5}$H$_{0.5}$PW$_{12}$O$_{40}$ (Cs2.5) studied in comparison with several other solid acids

Content Provider	Springer Nature Link
Author	Liu, Yanyong Koya, Gaku Miso, Makoto
Copyright Year	2000
Abstract	Isomerization of n-hexane and n-heptane was carried out over Cs$_{2.5}$H$_{0.5}$PW$_{12}$O$_{40}$ (denoted by Cs2.5) promoted by Pt which was introduced by either impregnation of H$_{2}$PtCl$_{6}$ or mechanical mixing of Pt/Al$_{2}$O$_{3}$ and over non-promoted Cs$_{2.5}$H$_{0.5}$PW$_{12}$O$_{40}$ in the presence of hydrogen at atmospheric pressure. The reaction temperature studied was relatively low (typically 453 and 423 K for n-hexane and n-heptane, respectively) and the hydrogen pressure was also rather low (standard conditions: feed = n-alkane 0.05 atm, H$_{2}$ 0.20 atm, N$_{2}$ balance; W/F = 40 g h mol$^{−1}$). Results were compared with those obtained under the same conditions for other Pt-promoted solid acids, where particular attention was paid to the time courses of the reaction (initial vs. stationary performance). Both the activity and selectivity of Cs2.5 at the initial stage (after 5 min) increased by the addition of the Pt component. Pressure dependencies of the rate at the initial stage were approximately first and −0.5th orders in alkane and hydrogen, respectively. Most remarkable was the suppression of the deactivation during the reaction in the presence of both Pt and hydrogen. For example, the mechanical mixture of Pt/Al$_{2}$O$_{3}$ and Cs2.5 (abbreviated as Pt+Cs2.5) showed little deactivation and much improved selectivity; resulting in high stationary conversion and selectivity; e.g., 98.4 and 92.1% selectivities for n-hexane and n-heptane at the conversions of 58.6 and 39.4%, respectively. Most of the results were well explained by a classical bifunctional mechanism, although other mechanisms are not all excluded. As for the other solid acids, the initial activity of Pt-promoted SO$_{4}$/ZrO$_{2}$ was high, but decreased rapidly. The deactivation was small with Pt-promoted H-ZSM-5, but the activity was low. The stationary yields of isomerized products were higher for Pt-promoted beta zeolite and Al-pillared saponite (tested only for n-heptane), although higher reaction temperatures were necessary.
Starting Page	239
Ending Page	246
Page Count	8
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	11
Issue Number	1-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2000-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Catalysis Characterization and Evaluation Materials Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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