Selectivity tailoring of Pd/CNTs in phenol hydrogenation by surface modification: Role of CO oxygen species

- The type of OCGs on CNTs was regulated by different pretreatments.
- Effect of different OCGs on the selective phenol hydrogenation was investigated.
- The selectivity to cyclohexanone decreased with the increase of CO amount.
- CO groups affected adsorption/desorption behavior of phenol/cyclohexanone.