title: Synthesis, characterization, and catalytic performance of Cr-incorporated aluminoborate octahedral molecular sieves.
abstract: A series of Cr-incorporated PKU-1 molecular sieves (Cr-PKU-1) were synthesized by using boric acid as a flux, and the physicochemical properties were characterized by XRD, ICP, SEM, XPS, UV-vis, and NH3-TPD methods. The morphology of Cr-PKU-1 is a needlelike hexagonal prism with uniform size of about 2 microm in diameter and 20-50 microm in length. XRD and UV-vis provide direct evidence that Cr ions have been successfully incorporated into the framework of PKU-1. NH3-TPD shows a dramatic increase of acidic sites in the Cr-PKU-1 in comparison with PKU-1, indicating that the Cr incorporation can significantly modify the acidity of the compound. In addition, the incorporated Cr ions may act as redox centers, thus catalytic performance of Cr-PKU-1 molecular sieve was investigated by the selective oxidation of styrene under mild reaction conditions.
authors.affiliation: State Key laboratory for Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.
authors.forename: Wenliang
authors.initials: W
authors.lastname: Gao
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.forename: Yingxia
authors.initials: Y
authors.lastname: Wang
authors.forename: Guobao
authors.initials: G
authors.lastname: Li
authors.forename: Fuhui
authors.initials: F
authors.lastname: Liao
authors.forename: Jianhua
authors.initials: J
authors.lastname: Lin