I have seen literature refer to catalyst supports being doped with another chemical, such as Nb doped $\ce{TiO2}$. What does it mean if a catalyst support is doped?


closed as off-topic by Mithoron, Jan, airhuff, Jannis Andreska, rmza7 Aug 7 '17 at 17:16

This question appears to be off-topic. The users who voted to close gave this specific reason:

If this question can be reworded to fit the rules in the help center, please edit the question.


If a substance is doped, it means that some small amount of another substance has been introduced into it. More specifically, a substance is doped by a dopant, the latter of which is the minority component. The dopant can be an additive to or a replacement within the bulk material.

In your case, some fraction of $\ce{Ti}$ atoms are replaced by $\ce{Nb}$ atoms (the replacement scenario is the usual one for crystalline materials such as yours). Thus, the physical properties of your substate will be slightly different that those of pure $\ce{TiO2}$.

See this Wikipedia entry for a more complete summary of what I have written here.


Not the answer you're looking for? Browse other questions tagged or ask your own question.