Exploitable results
In the period covered by the report a series of metal and bimetal dispersions supported within molecular sieves matrices were prepared following standard preparation techniques. X-ray diffraction and a number of complementary surface science techniques available in the participating laboratories, namely transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and temperature programmed desorption, were used to optimize preparation procedures and to characterize composition, structure and stability of the materials. As a result structure-function relationships could be established for a number of well-defined metal and alloy dispersions on molecular sieve supports in chemisorption experiments and in catalytic testing.
Three catalytic test reactions were studied: the selective reduction of NOx over monometallic (Cu, Pt, La, Ir) and bimetallic (Pt-La, Pt-Ir) catalysts, the hydrocondensation of butyraldehyde and the hydrogenation of 2-ethylhexanal with Pd supported on AlP04 , VPI-5 and NaX. Catalytic testing is still in progress in the laboratories of the participating institutions in Moscow and in Nottingham, U.K.
Improved preparation conditions led to a detailed elucidation of size-quantization effects in the case of lead sulphide dispersions supported within a zeolite matrix. In the case of titanium oxide loaded zeolite materials with promising sensing properties towards reducing and oxidizing gases could be developed. The materials will be applied within a larger materials research project set up at the University of Bremen.
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