Solution Phase Metal Atom Preparation of Catalytically Active Zeolite-Encapsulated Metal Clusters; Characterization and Application to the Selective Reduction of Carbon Monoxide to Butene

✍ Scribed by Ms. Linda F. Nazar; Professor Geoffrey A. Ozin; Dr. Fracois Hugues; Mr. John Godber; Mr. Denis Rancourt

• Publisher: John Wiley and Sons
• Year: 1983
• Tongue: English
• Weight: 361 KB
• Volume: 22
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.198308980

✦ Synopsis

In this communication we wish to report the development of a new and versatile technique for the preparation of zeoliteencapsulated,zerovalent metal clusters under extremely mild conditions, which relies on the insitu formation of a highly labile organometallic in solution (solvated metal atom reagents) by rotary metal vapour solution phase synthetic techniques. The method is applicable to a wide variety of metals. The choice of the organometallic species that acts as the metal atom carrier in this technique is governed by the dimensions and stability of the molecule which must be sufficiently small to permit access to the a-cage of the zeolite through the outer window 17.m in dizm for Nay) and also suffxiently labile to allow faclle dissociation of the organic ligand at, or below room temperature. These requirements are nicely met in the case of iron and cobalt, by the bis1toluene)metaliO) complexes, whose dimensions can be 'roughly estimated to be -?A along the longest axis, and whose decomposirian temperatures are approxlmately -30 and -50°c respectively / I / .

The Massbauer Spectra in Figure show the results obtained. for a representative 57Fe enriched sample of Fe;/NaY, with ' 0.07 0.82 A, Pit za 0.0s 0.66 0.77 0.14 1.07 0.21 d t s ) &s)