Developing
economic and applicable catalysts with elegant chlorine
resistance and organic byproduct inhibition capability is of great
significance for chlorinated volatile organic compounds (Cl-VOCs)
eco-friendly purification. Here, ternary Ce
x
Sr1–x
TiO3 catalysts
with tunable surface acidity and oxygen species mobility were creatively
fabricated using the hollow tubular-structured fruit hair of Platanus
(FHP; a widespread greenery waste) as the scaffolding biotemplate.
It is shown that the oxygen vacancy (Ov) triggered by the
presence of Ce can optimize the synergy between the Lewis acid sites
(LAS) and Brønsted acid sites (BAS). High concentration of Ov and BAS promotes the C–Cl cleavage of chlorobenzene
(CB) and accelerates the desorption of Cl• radicals
as inorganic chlorine. Simultaneously, the strong electron transfer
within Ti-Ce-Sr linkage increases the acidity of LAS, resulting in
the superior reducibility of Ce0.4Sr0.6TiO3 and facilitating the deep oxidation of dechlorination intermediates.
Additionally, the spatial confinement of the tubular structure remarkably
accelerates the CB flow rate and reduces the residence time of byproducts
over the prepared catalysts. Owing to these, CB can be efficiently
destructed over Ce0.4Sr0.6TiO3 with
selectivity of CO2 and inorganic chlorine dramatically
enhanced, respectively, approximately 16 and 21 times at 275 °C
compared to those of pure SrTiO3. The present work provides
a feasible and promising strategy for engineering efficient catalysts
for heterogeneous thermocatalytic reactions for industrial-scale Cl-CVOC
destruction.