DEACTIVATION OF HETEROGENEOUS CATALYSTS FOR HYDROCARBON CONVERSION

The deactivation of metal sites and acid sires on heterogeneous catalysts duri It is also shown that carbonaceous deposits built upon oxides via spill-over from metal sites is active in ethene hydrogenation in its own right. Thus during catalysis of hydrocarbon reactions some sites (metallic and acidic) are lost or made unavailable while simultaneously others are generated. This complex yet intriguing situation emphasises the need for in-situ characterisation of catalytic surfaces.