TY - JOUR
T1 - Fe-zeolites as catalysts for chemical oxidation of MTBE in water with H2O2
AU - Gonzalez-Olmos, R.
AU - Roland, U.
AU - Toufar, H.
AU - Kopinke, F. D.
AU - Georgi, A.
PY - 2009/7/15
Y1 - 2009/7/15
N2 - The heterogeneous catalytic wet oxidation of methyl tert-butyl ether (MTBE) with hydrogen peroxide, catalyzed by the iron-containing zeolites Fe-ZSM5 and Fe-Beta, was studied at ambient conditions and pH 7. The kinetics of MTBE degradation could be well-fitted to a pseudo-first-order model. Using Fe-ZSM5, the dependence of the reaction rate constant on hydrogen peroxide and catalyst concentration was determined. Furthermore, the formation and oxidation of tert-butyl alcohol and tert-butyl formate as intermediates of MTBE oxidation were studied. A comparison of the reaction rates of MTBE, trichloroethylene and diethyl ether in the Fe-ZSM5/H2O2 system revealed that adsorption plays a positive role for the degradation reaction. Comparing the two types of Fe-containing zeolites applied in this study, Fe-Beta showed a lower catalytic activity for H2O2 decomposition and also MTBE degradation. However, in terms of utilization of H2O2 for MTBE degradation Fe-Beta is advantageous over Fe-ZSM5. This could be explained by the stronger adsorptive enrichment of MTBE on the Fe-Beta zeolite. This study shows that Fe-containing zeolites are promising catalysts for oxidative degradation of MTBE by H2O2.
AB - The heterogeneous catalytic wet oxidation of methyl tert-butyl ether (MTBE) with hydrogen peroxide, catalyzed by the iron-containing zeolites Fe-ZSM5 and Fe-Beta, was studied at ambient conditions and pH 7. The kinetics of MTBE degradation could be well-fitted to a pseudo-first-order model. Using Fe-ZSM5, the dependence of the reaction rate constant on hydrogen peroxide and catalyst concentration was determined. Furthermore, the formation and oxidation of tert-butyl alcohol and tert-butyl formate as intermediates of MTBE oxidation were studied. A comparison of the reaction rates of MTBE, trichloroethylene and diethyl ether in the Fe-ZSM5/H2O2 system revealed that adsorption plays a positive role for the degradation reaction. Comparing the two types of Fe-containing zeolites applied in this study, Fe-Beta showed a lower catalytic activity for H2O2 decomposition and also MTBE degradation. However, in terms of utilization of H2O2 for MTBE degradation Fe-Beta is advantageous over Fe-ZSM5. This could be explained by the stronger adsorptive enrichment of MTBE on the Fe-Beta zeolite. This study shows that Fe-containing zeolites are promising catalysts for oxidative degradation of MTBE by H2O2.
KW - Adsorption
KW - Advanced oxidation processes
KW - Fenton
KW - Kinetics
KW - MTBE
KW - Zeolites
UR - http://www.scopus.com/inward/record.url?scp=66149161575&partnerID=8YFLogxK
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=pure_univeritat_ramon_llull&SrcAuth=WosAPI&KeyUT=WOS:000267203200007&DestLinkType=FullRecord&DestApp=WOS_CPL
U2 - 10.1016/j.apcatb.2008.12.014
DO - 10.1016/j.apcatb.2008.12.014
M3 - Article
AN - SCOPUS:66149161575
SN - 0926-3373
VL - 89
SP - 356
EP - 364
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
IS - 3-4
ER -