The development of catalysts with high chlorine resistance
for
volatile organic compound (VOC) degradation is of great significance
to achieve air purification. Herein, Pd@ZrO2 catalysts
with monodispersed Pd atoms coordinated with Cl were prepared using
an in situ grown Zr-based metal–organic framework
(MOF) as the sacrifice templates to enhance the chlorine resistance
for VOC elimination. The residual Cl species from the Zr-MOF coordinated
with Pd, forming Pd1–Cl species during the pyrolysis.
Meanwhile, abundant oxygen vacancies (VO) were generated,
which enhanced the adsorption and activation of gaseous oxygen molecules,
accelerating the degradation of VOCs. In addition, the Pd@ZrO2 catalysts exhibited satisfactory water resistance, long-term
stability, and great resistance to CO and dichloromethane (DCM) for
VOC elimination. In situ diffuse reflectance infrared
Fourier transform spectroscopy (DRIFTS) results elucidated that the
generation of Pd1–Cl species in Pd@ZrO2 suppressed the absorption of DCM, releasing more active sites for
toluene and its intermediate adsorption. Simultaneously, the monodispersed
Pd atoms and VO improved the reactivity of gaseous oxygen
molecule adsorption and dissociation, boosting the deep decomposition
of toluene and its intermediates. This work may provide a new strategy
for rationally designing high-chlorine resistance catalysts for VOC
elimination to improve the atmospheric environment.