Catalytic activity and stability of porous Co–Cu–Mn mixed oxide modified microfibrous-structured ZSM-5 membrane/PSSF catalyst for VOCs oxidation

Abstract

A porous cobalt-copper-manganese mixed oxide modified microfibrous-structured ZSM-5 membrane/ PSSF (paper-like sintered stainless steel fibers) catalyst was fabricated by the incipient wetness impregnating method. Catalytic oxidation performances of VOCs in single component (isopropanol or ethyl acetate) and in binary mixtures (isopropanol and toluene, ethyl acetate and toluene) were investigated over the microfibrous-structured ZSM-5 membrane/PSSF catalyst. The stability and durability of the microfibrous-structured ZSM-5 membrane/PSSF catalyst for isopropanol oxidation were also evaluated. The as-synthesized and tested (after being used at 260 C for 550 h) microfibrousstructured ZSM-5 membrane catalysts have been characterized by a series of techniques including SEM, EDS mapping, XRD, N 2 adsorption-desorption, XPS and H 2 -TPR methods. Experimental results indicated that the total destruction of isopropanol or ethyl acetate alone over the microfibrous-structured ZSM-5 membrane/PSSF catalysts can be achieved at a temperature of 280 C In the case of binary mixtures, the total conversion temperatures for toluene are above 300 C The porous microfibrous-structured ZSM-5 membrane/PSSF catalyst possesses excellent reaction stability, demonstrating by a high catalytic activity (>90%) during the 550 h long-term catalytic oxidation reaction of isopropanol. After being used at 260 C for 550 h, the structural and textural properties of the catalyst were changed slightly during the long-term catalytic oxidation process.

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

“…The stability of the catalyst is clearly a determining factor in industrial applications. Chen et al 1120 La0.6Sr0.4CoO3 with satified reaction stability in the oxidation of toluene were also reported. 395,436 Rei and co-workers 1121 proposed that the Pt/h-BN (hexagonal boron nitride) was a very active and stable catalyst for VOC oxidation even under a high temperature environment (500 °C) owing to the high thermal conductivity and water resistant ability of h-BN.…”

Low temperature chlorobenzene catalytic oxidation over MnOx/CNTs with the assistance of ozone

“…Thus it can be inferred that Mn species in MnO x /CNTs catalyst were involved in CB oxidation. 32 Fig. 4b …”

“…Thus it can be inferred that Mn species in MnO x /CNTs catalyst were involved in CB oxidation. 32 Fig. 4b showed the XPS spectra of O 1s for the fresh and used catalysts.…”

One-step synthesis, characterization and catalytic performance of hierarchical Zn-ZSM-11 via facile ZnO routes

“…Over the last few decades, transition metal ion modied zeolites, particularly the metal-modied pentasil zeolites have gained a great deal of attention since the incorporation of transition metals endows zeolites with many special catalytic properties. [1][2][3] Among them, Zn or Ga modied ZSM-5 or ZSM-11 have been known as the active catalysts for aromatization of light paraf-ns; [4][5][6] the ZSM-5 and ZSM-11 zeolites containing Co or Cu display excellent activity in selective NO reduction with methane or NO and N 2 O decomposition, [7][8][9][10][11] the modication of ZSM-5 zeolites with Fe and Mn confers to the materials a good selective oxidation performance. 12,13 Generally, these metal species can be incorporated into the zeolite phase by post-treatment methods of ion-exchange or impregnation.…”