Strong metal–support
interactions involving electron and
oxygen transfer in Pd/C (no leaching but less active) and Pd/CeO2 (active but leaching) catalysts determine their catalytic
performance in the catalytic wet air oxidation of amide. To control
these two types of interactions, the triple-layer structure Pd/CeO2/C, where Pd is predominantly located on CeO2 and
CeO2 on a C support, was designed and prepared. As a result,
the electrons could be transferred from carbon to Pd via CeO2 for excellent leaching resistance, while oxygen was transferred
from CeO2 to Pd for high oxidation activity. In addition,
both of these interactions could be easily adjusted by changing the
amount of CeO2.
Surface properties of nanoceria can strongly affect the catalytic performance in oxidation reactions. In this work, a simple but efficient post-treatment, where H 2 O 2 is used as a complexing agent to dissolve Ce 3+ from the surface of CeO 2 nanorods with the help of ultrasonic treatment, is carried out to tune the surface properties and increase their catalytic performance for catalytic wet air oxidation (CWAO) of phenol. It is found that the dissolution of Ce 3+ from the surface of CeO 2 nanorods can create more surface defects and result in a much rougher surface. The H 2 O 2 −ultrasonic treatment can also increase Ce 3+ concentration, create more surface oxygen vacancies, and narrow the band gap of CeO 2 nanorods. These properties enable H 2 O 2 −ultrasonic-treated CeO 2 nanorods (CeO 2 -H 2 O 2 -sf) to possess strong oxidizing ability to effectively oxidize phenol. Additionally, for the sake of comparison, other post-treatments, including calcination, H 2 O 2 , and ultrasonic−H 2 O, are also imposed on CeO 2 nanorods.
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