Abstract
Microreactor studies and radiochemical tracer techniques have been used to investigate the effect of carbon dioxide on the methanol synthesis activity of catalysts derived from binary rare earth/Cu precursors and from ternary rare earth/Cu/Ti, Zr or Al precursors. In the former case, carbon dioxide causes strong irreversible deactivation. However, the inclusion of a third metal component significantly enhances poisoning resistance without undue loss of the very high activity exhibited by the binary materials. Results obtained with 14CO 2 indicate clearly that the methanol product is derived principally from carbon monoxide: the catalytic mechanism which operates on this novel class of materials must therefore be quite different from that which is characteristic of conventional Cu/ZnO/Al 2O 3 catalysts.
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