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- W1968201150 abstract "Abstract A series of Al‐incorporated mobile crystalline materials (Al‐MCM‐41) were prepared by hydrothermal synthesis and characterized by XRD, N 2 adsorption (isotherms), inductively coupled plasma (ICP) analysis, 27 Al magic angle spinning (MAS) NMR spectroscopy, and in situ pyridine adsorption (IR analysis). All samples exhibit an ordered structure with the majority of Al species in framework positions, except those with an SiO 2 /Al 2 O 3 ratio ≤10. The concentration of acid sites is closely related to the Al content in the unit cell. In the presence of Al‐MCM‐41, both α‐ and β‐pinenes are quickly transformed into isomerized products, which then couple to form homo‐ and heterodimers. Lewis acid sites are active in triggering both the isomerization and dimerization reactions, but weak Brønsted acid sites seem inactive for the dimerization. Al‐MCM‐41 has a greater activity than many other microporous and layered materials, and can be easily regenerated. The activity correlates well with the concentration of acid sites, and the sample with an SiO 2 /Al 2 O 3 ratio of 20 shows the highest activity." @default.
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- W1968201150 date "2012-05-22" @default.
- W1968201150 modified "2023-10-18" @default.
- W1968201150 title "Isomerization and Dimerization of Pinene using Al-Incorporated MCM-41 Mesoporous Materials" @default.
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- W1968201150 doi "https://doi.org/10.1002/cctc.201200106" @default.
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