The mechanically driven process of CO hydrogenation over NiZr amorphous powders is presented. Special milling vials were employed as reactors; the structure of the powders was checked by correlating X-ray and thermal analysis data; the gaseous products were sampled at different steps during the reaction. The sequence of structural changes accompanying CO and hydrogen activation starts with increase in the specific surface area and contact surface, and diffusion is promoted. Zr oxide species develop and crystalline Ni demixes from the destabilized matrix. After an induction step, the formation of hydrocarbons was observed with a very high selectivity to methane. This behaviour was compared with the activity and selectivity of NiZr amorphous alloys run in a conventional flow-type reactor.
MECHANICALLY DRIVEN CO HYDROGENATION OVER NIZR AMORPHOUS CATALYSTS / Mulas, Gabriele Raimondo Celestino Ettore; Conti, L; Scano, G; Schiffini, L; Cocco, G.. - In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. - ISSN 0921-5093. - 182:(1994), pp. 1085-1090.
MECHANICALLY DRIVEN CO HYDROGENATION OVER NIZR AMORPHOUS CATALYSTS
MULAS, Gabriele Raimondo Celestino Ettore;
1994-01-01
Abstract
The mechanically driven process of CO hydrogenation over NiZr amorphous powders is presented. Special milling vials were employed as reactors; the structure of the powders was checked by correlating X-ray and thermal analysis data; the gaseous products were sampled at different steps during the reaction. The sequence of structural changes accompanying CO and hydrogen activation starts with increase in the specific surface area and contact surface, and diffusion is promoted. Zr oxide species develop and crystalline Ni demixes from the destabilized matrix. After an induction step, the formation of hydrocarbons was observed with a very high selectivity to methane. This behaviour was compared with the activity and selectivity of NiZr amorphous alloys run in a conventional flow-type reactor.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.