posted on 2021-10-11, 07:03authored byLiwei Wang, Rongrong Han, Yanfu Ma, Melis S. Duyar, Wei Liu, Jian Liu
More than 25% of chemical transformations
involve at least one
hydrogenation step. Selective hydrogenation of unsaturated aldehydes
is an essential process in the industrial production of pesticides
and pharmaceutical synthesis. Since CC hydrogenation with
lower bond energy is thermodynamically favored over CO hydrogenation,
the selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol
(COL) is relatively challenging. Herein, we report a series of Pt-CeO2 nanoreactors with different spatial locations and microenvironments
of Pt nanoparticles (NPs) on hollow CeO2 that are active
for the selective hydrogenation of CAL to COL. We show the effects
of active metal spatial location, microenvironment, metal–support
interactions, and Fe doping on the activity and selectivity within
Pt-CeO2 nanoreactors. Pt@Fe-CeO2 shows excellent
catalytic performance with an 88.9% selectivity for COL at a CAL conversion
of 97.2%. The variations of the electronic and crystal structure after
Fe doping, simultaneously, and the linear adsorption of CAL on the
CeO2 hollow structure contribute to the high performance
of selective hydrogenation to COL. Our findings might shed light on
the rational design of the nanoreactors for catalytic organic transformations
with desired selectivity.