Additional Lewis acid sites of protonated fibrous silica@BEA zeolite (HSi@BEA) improving the generation of protonic acid sites in the isomerization of C6 alkane and cycloalkanes

Platinum‐promoted fibrous silica Y zeolite with enhanced mass transfer as a highly selective catalyst for n ‐dodecane hydroisomerization

“…Notably, Pt/HY@KCC‐1 has displayed a superb catalytic performance with conversion and isomer yield of 100% and 72% at 350°C, respectively. Significantly, the incorporation of Pt led to increased acid sites in HY@KCC‐1, probably because of the ability of Pt metals forming more protonic acid sites via hydrogen spillover phenomenon . In addition, the isomer selectivity is highly influenced by the Pt dispersion on the Pt/HY@KCC‐1 catalyst.…”

“…Indeed, although there are several reports published on platinum‐promoted zeolite material for alkane isomerization, the modified fibrous silica zeolite is still dispensable in this type of reaction. Previously, it was reported that the isomerization of C 6 alkane over HSi@BEA as catalyst was successfully conducted by the generation of protonic acid sites that originated from molecular hydrogen and from C 6 alkanes and cycloalkanes . Besides, the additional LAS promote the formation of protonic acid sites and lead to produce higher isomers yield of n ‐hexane, cyclohexane, and methylcyclopentane.…”

“…Significantly, the incorporation of Pt led to increased acid sites in HY@KCC-1, probably because of the ability of Pt metals forming more protonic acid sites via hydrogen spillover phenomenon. [41][42][43] In addition, the isomer selectivity is highly influenced by the Pt dispersion on the Pt/HY@KCC-1 catalyst. The high surface area and mesoporosity exhibited by Pt/HY@KCC-1 led to good dispersion of Pt nanoparticles ( Table 2 and Figure 2D).…”

“…Previously, it was reported that the isomerization of C 6 alkane over HSi@BEA as catalyst was successfully conducted by the generation of protonic acid sites that originated from molecular hydrogen and from C 6 alkanes and cycloalkanes. 41 Besides, the additional LAS promote the formation of protonic acid sites and lead to produce higher isomers yield of n-hexane, cyclohexane, and methylcyclopentane. It was revealed that the internal diffusion limitation in HSi@BEA catalyst for n-hexane, cyclohexane, and methylcyclopentane isomerization were below 0.1, indicating internal diffusion of the catalyst was negligible.…”

Promotional Effect of Pd Addition on the Catalytic Activity of Composite Pt-Pd/AlSBA-15–β Catalyst for Enhanced n-Heptane Hydroisomerization

“…Acid sites were classified as weak (desorption at 200 • C), medium (at 250 • C), and strong (at 300 and 350 • C). The absorption bands at 1455 and 1623 cm −1 are assigned to pyridine interacting with Lewis acid sites (PyL) [31][32][33]. The absorption bands at 1545 and 1640 cm −1 correspond to pyridine coordinated to Brønsted acid sites (PyH + ) [34,35].…”