Abstract
The mesoporous Cr/ZSM-5 and W-Cr/ZSM-5 zeolites have been successfully synthesized by loading chromium and tungsten on zeolite support. The metal loaded ZSM-5 catalysts were analyzed by several characterizations such as XRD, SEM-EDS, TEM, and BET. The catalytic activities and recycle efficiency were also investigated by applying catalysts for oxidation of oleic acid. These catalysts exhibited the high catalytic efficiency for cleavage of double bond with the use of H2O2. The oleic conversion of 88.7% and 93.3% could be achieved for Cr/ZSM-5 and W-Cr/ZSM-5 catalyst, respectively. Moreover, the modified ZSM-5 catalysts also demonstrated a long life time and high stability.
Highlights
Over many decades the use of zeolites, an environmentally attractive solid catalyst, in industry as catalysts, adsorbents, and ion exchangers have become more and more popular due to their characteristic properties such as shape selectivity, thermal stability, acidic and basic nature coupled with the ease of set-up and work-up procedure.[1]
The results showed that no diffraction peaks of Cr-containing or W-containing crystalline phases were identified, representing the low amount and high dispersion of chromium and tungsten species over the ZSM-5 zeolite matrix
There were no alterations on structure and crystallinities, which were confirmed by X-ray diffraction (XRD) characterization
Summary
Over many decades the use of zeolites, an environmentally attractive solid catalyst, in industry as catalysts, adsorbents, and ion exchangers have become more and more popular due to their characteristic properties such as shape selectivity, thermal stability, acidic and basic nature coupled with the ease of set-up and work-up procedure.[1]. To enhance the catalytic activity, other elements should be introduced into the framework of ZSM-5 zeolite.[10,11,12,13,14,15,16,17] In this context, the acitivity of the ZSM-5 zeolite was predicted to be improved by the addition of metal ions to the structure. Transition metal modified zeolites (such as Cr/ZSM-5 and W-Cr/ZSM-5) are interesting materials to be probe as high active catalysts in oxidation of unsaturated fatty acids
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