Effects of Additives and the Strong Metal-Support Interaction on Alkane Hydrogenolysis

EFFECTS OF ADDITIVES AND THE STRONG METAL-SUPPORT INTERACTION ON ALKANE HYDROGENOLYSIS 

TABLE 13.13. Selected References to the Modification of Groups 8 to 10 Metals for Alkane Hydrogenolysis by Oxides Causing the SMSI 

Apparent SMSI effects have also been reported with non-Transition Metal oxide supports.Those obtained with magnesia were almost certainly due to evolution of traces of hydrogen sulfide, or of iron ions, from the bulk at the high temperatures used, but real effects have been seen with silica when very high pre-treatment temperatures were employed the rate of the ethane reaction decreased more quickly than that of hydrogen chemisorption, pointing clearly to the need for multiatomic sites in hydrogenolysis. 

TABLE 13.14. Hydrogenolysis of n-Butane on Pt-containing Smectic-Uke Clays (SM) 

When pyridine was added to n-butane during its hydrogenolysis over Ru/Si02, the rate was suppressed, but (as with sulfur poisoning ) isomerisation then became visible. Pyridine also scavenged hydrocarbon radicals, which were detected as their pyridine adducts. 

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