Enhanced toluene combustion performance over Pt loaded hierarchical porous MOR zeolite

Removal of volatile organic compounds (VOCs) has recently been attracted much attention, and zeolite supported platinum catalyst is regarded as one of the most efficient methods. Herein, hierarchical porous mordenite (denoted as HPMOR) was fabricated via a facile acid and alkali post-treatment strategy and used for toluene total combustion for the first time. This method avoids the use of high price template and shows better performance than conventional MOR zeolite. Powder X-ray diffraction (PXRD) confirmed that the samples were well retained MOR crystal structure even after de-metal treatment. N-2 adsorption/desorption isotherm analysis showed that the mesopore volume and pore size of HPMOR are 0.16 cm(3)/g and 8.5 nm, respectively, which mean that the hierarchical porous MOR (HPMOR) was successfully prepared. Transmission electron microscopy (TEM) images exhibited that the size of Pt nano-particles (NPs) on HPMOR is obviously smaller than on traditional MOR. H-2 adsorption-desorption and X-ray photoelectron spectroscopy (XPS) revealed that Pt NPs have higher dispersion and Pt-0/Pt2+ ratio than conventional MOR (Pt/MOR). Thus, Pt/HPMOR catalyst exhibits superior catalytic performance for toluene combustion compared with Pt/MOR, which makes it potential catalyst for real exhaust control.