Zeolite-supported noble-metal catalysts
are considered to be one
of the most promising materials to achieve complete oxidation of volatile
organic compounds (VOCs). However, noble metals tend to agglomerate
under synthesis/reaction conditions and are easily poisoned by halogen
compounds, resulting in reduced catalytic activity and stability.
Herein, Pt nanoparticles (∼2 nm) encapsulated in ZSM-5 catalysts
(Pt/Z-En) with a series of Si/Al molar ratios were prepared by a one-pot
synthesis strategy using tetraammineplatinum nitrate as the metal
precursor, and their catalytic performance for oxidation of VOCs was
explored. The characterizations showed that the Pt–zeolite
interaction and metal dispersion were significantly enhanced after
encapsulation in zeolite. In the VOC (toluene as a model reactant)
oxidation experiment, Pt/Z-En possessed higher catalytic activity
compared with catalysts prepared by the impregnation method (Pt/Z-Im).
In addition, hydrophobic modification by increasing the Si/Al molar
ratio facilitated the adsorption of toluene and restricted the adsorption
of halogen compounds (1,2-dichloroethane) on the catalyst, which further
promoted catalytic activity and stability. The Pt/Z-200-En catalyst
with a Si/Al molar ratio of 200 gave the optimum catalytic performance,
with a toluene conversion of 98% at a temperature as low as 214 °C
with long-term stability.
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