Synthesis of mesoporous Cr/ZSM-5 and W-Cr/ZSM-5 zeolite catalysts for oxidation of unsaturated fatty acid

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.

Influence of the acidity of solid catalyst HSO3-ZSM-5 on the hydrolysis of pretreated corncob

“…Possessing many advantages such as high surface area, low-toxicity, and functional groups for graing or attachment, zeolites have been used effectively in industry as ion exchangers, adsorbents, separators, and catalysts for chemical reactions. [6][7][8] Among a variety of zeolites, ZSM-5 has been used most popularly. On the one hand, the material has strong acidity, high selectivity thanks to its special micro-meso porous structure.…”

Cleavage of double bond using metal‐loaded ZSM‐5 zeolite catalysts for renewable biochemical application

“…It is known that solvent plays an important role in catalytic activity. Among a variety of solvents, acetonitrile was found to be a suitable solvent for the oxidation of C═C double bond, as was reported in other studies . In the work completed by Sauxa and Pierella and Hoang et al, the solvent was used in the presence of hydrogen peroxide due to its high solubility in both organic compounds and H 2 O 2 .…”

“…It is well‐known that catalytic activity of a zeolite for an oxidation reaction was able to enhance by loading a transition metal over the zeolite support . Thus, in this work, Cr and W were loaded onto the ZSM‐5 zeolites using a wetness impregnation method . The as‐obtained metal‐loaded ZSM‐5 zeolite particles were characterized by XRD and SEM‐EDS analysis.…”

“…This indicated that the metal‐loaded ZSM‐5 zeolite had a long durability and high stability in the catalytic reaction system. This could be attributed to the presence of chromium or tungsten in the zeolite catalysts and this would increase their thermal stability and catalytic activity . Besides, the high surface area of the mesoporous metal‐loaded ZSM‐5 zeolite catalysts could also facilitate the entering of the styrene or fatty acid molecules into the pores of the catalysts to approach the active site and improve the transfer as well as the removal of products out of zeolite pores.…”

“…To extend the catalytic activity of the ZSM‐5 zeolite, Cr/ZSM‐5, and W‐Cr/ZSM‐5 catalysts were prepared by loading chromium and tungsten over the zeolite support using the conventional incipient wetness impregnation method . The as‐synthesized ZSM‐5 particles were added into the chromium chloride solution (prepared from CrCl 3 .6H 2 O, 96 %, Sigma Aldrich) and stirred at 30 °C for several hours.…”