Question

Which transition metals are commonly used as catalysts?

Answer 1

Answer:

The commonly used catalysts are Fe, Mo, Co, Cu, and Cr NPs.

Explanation:

1 Catalysts and CVD process. Transition metal catalyst is indispensable for synthesizing ultralong CNTs using CVD. The carbon source can decompose into individual carbon atoms or atom pairs on the surface of these metal NPs at 700–1100 °C, and then form CNTs. Copper is an ideal example of a transition metal with its variable oxidation states Cu2+ and Cu3+.

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