Article ID Journal Published Year Pages File Type
10238964 Applied Catalysis A: General 2005 10 Pages PDF
Abstract
Acetylene decomposition performed around 600 °C on these samples yield small amounts of carbon tubular nanostructures (nanotubes and nanofilaments). However, we have found that, whatever the temperature, carbon tubular nanostructures growth (tip growth mechanism) is favoured on the destructured regions of the material where the Ni particles are weakly bound to the support. Higher density of tubular nanostructures is consequently observed for the higher temperature samples. We attributed this behaviour to the fact that the strongly bound anchored Ni particles mainly exhibit (1 1 1)-type faces, which are known to promote carbon precipitation. This would lead to coking when particles are not able to rearrange (as it is the case for the anchored particles) whereas carbon tubular nanostructures may grow on weakly bound particles that are able to rearrange.
Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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