The Preparation of Colloidal Pt/Rh Alloys Stabilized by NR4+- and PR4+-Groups and their Characterization by X-Ray-Absorption Spectroscopy
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چکیده
Z. Naturforsch. 50b, 333-338 (1995); received September 9, 1994 Nanometallic Organosols, Alloy Colloids of Pt/Rh, Catalysis Bimetallic Pt/Rh colloids protected by NR4+or PR4+ groups are accessible by the co reduction of PtCl2 and RhCl3 using hydrotriorganoborates in organic media. According to TEM the particle size ranges from 1.9 to 2.5 nm. EDX point analysis of several samples has shown that both metals are present in the particles. The metallic character of the Pt/Rh core confirmed by XANES, and EXAFS data clearly indicate the formation of nanometallic al loys. Colloidal Pt/Rh alloys prepared in this way are very soluble and highly stable in organic phases and serve as sources for heterogeneous hydrogenation catalysts.
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تاریخ انتشار 2013