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X-ray absorption spectroscopic study on the states of gallium and platinum in Pt/Ga/H-beta zeolites

✍ Scribed by Kuei Jung Chao; An Chyi Wei; Hung Chung Wu; Jyj Fu Lee

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 384 KB
Volume: 35-36
Category: Article
ISSN: 1387-1811
DOI: 10.1016/s1387-1811(99)00238-3

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✦ Synopsis

X-ray absorption ( XANES and EXAFS ) at the Ga K-edge and the Pt L-edge was used to monitor the variation of chemical states of gallium and platinum under in situ redox treatments in Pt/Ga/H-beta zeolites prepared by incipient wetness impregnation. It was found that the Ga species exist mainly as isolated GaO 4 units after calcination. Upon reduction, the gallium(III ) cations are removed from the lattice to form gallium hydride oligomers or attach to metallic platinum particles on the support. The gallium hydride oligomer is considered to be two Ga atoms separated by a distance of 2.99 A ˚with bridging H atoms. Both Ga K-edge and Pt L-edge EXAFS analyses indicate the formation of GaPt bimetallic species with an interatomic distance of 2.51-2.54 A ˚. These can prevent the sintering of Pt aggregates to large particles and affect the role of Pt in Pt/Ga/zeolites in aromatization of light paraffins.

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