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• W2161370346 abstract "Abstract Catalytic isomerization of n ‐pentane was studied over novel high surface area ( HS ) aluminum fluoride supported palladium and platinum catalysts, prepared by the nonaqueous fluorolytic sol–gel synthesis. HS ‐AlF 3 maintained well its nanoscopic, mesoporous, and highly acidic character at higher temperatures, up to 350 °C. Both Pt/ HS ‐AlF 3 and Pd/ HS ‐AlF 3 catalysts, characterized by very small metal particle sizes (≈2 nm) maintained very good activity, stability, and selectivity towards isomerization (up to nearly 100 %) at up to 350 °C. Very strong acidity of HS ‐AlF 3 is the prerequisite for isomerization but the presence of the metal is also essential to maintain a high conversion level. The effect of metal–acid balance in Pd/ HS ‐AlF 3 catalysts, important for bifunctional isomerization, was tested by screening three differently metal‐loaded catalysts. The performance of the 0.5 wt % Pd/ HS ‐AlF 3 appeared as good as that of 2.0 wt % Pd. The properties of the HS ‐AlF 3 support, catalyst precursors, and catalysts were characterized by XRD, TEM, H 2 chemisorption, and FTIR photoacustic spectroscopy of adsorbed pyridine, and NH 3 temperature programmed desorption. The first three methods allowed evaluating the state of the metal in the reduced catalysts. The suppressed chemisorption of H 2 must result from different factors, such as carbon presence in Pd introduced during catalyst synthesis and activation, metal–acidic support interaction, and, partially, metal encapsulation in AlF 3 during sol–gel synthesis. Lewis and Brønsted acidity was detected in activated catalysts and both types of acid sites were assumed to play a role in bifunctional isomerization. NH 3 effectively blocks the strongest acid sites and drastically limits the overall catalytic performance. Introduction of water to the reaction system also degrades, but to a lesser extent, the Pd(Pt)/ HS ‐AlF 3 catalyst performance, most probably because of poisoning of only the strongest Lewis acid sites." @default.
• W2161370346 created "2016-06-24" @default.
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• W2161370346 date "2014-01-02" @default.
• W2161370346 modified "2023-10-18" @default.
• W2161370346 title "Aluminum Fluoride-Supported Platinum and Palladium as Highly Efficient Catalysts of<i>n</i>-Pentane Hydroisomerization" @default.
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• W2161370346 doi "https://doi.org/10.1002/cctc.201300840" @default.
• W2161370346 hasPublicationYear "2014" @default.
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