# What does it mean if a catalyst support is doped? [closed]

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, rmza7Aug 7 '17 at 17:16

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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 $\ce{TiO2}$.