c-Axis-oriented sheet-like Cu/AEI zeolite contributes to continuous direct oxidation of methane to methanol

Abstract

In continuous direct oxidative methane to methanol (cDMTM), suppression of tandem reaction of the produced methanol to olefins is one of the key issues for improving the methanol formation rate,...

One-Pot Synthesized Fe-AEI Zeolite Catalysts Contribute to Direct Oxidation of Methane

“…First, the effect of the Si/Fe ratio on direct oxidation of methane reaction performance is conducted at 350 °C based on our recent studies (Figures S6 and S7). ,, As revealed in Figure , the initial conversion of N 2 O and CH 4 enhanced from ca. 80 to 100% and ca.…”

Preparation of Cu-Based Spherical Micromesoporous Material by Using Sepiolite Toward Methanol Production from Catalytic Oxidation of Low-Concentration Coalbed Methane

“…As presented in Figure a, the NH 3 -TPD curves of three catalysts in general displayed two desorption signal peaks in the ranges of 50–200 and 250–450 °C, demonstrating there were weak and medium acid sites dispersed on the three catalysts. According to the literature, , the desorption peak below 200 °C corresponded to the physical adsorption of NH 3 on the surface or the framework of catalysts and the weak chemical adsorption of NH 3 on the weak Lewis acid sites (LAS). Furthermore, the peaks at 250–450 °C were ascribed to the storage of NH 3 on the medium acid sites, which were generally derived from the incorporation of copper ions into the framework of support.…”

Copper–oxygen adducts: new trends in characterization and properties towards C–H activation

“…Zeolite topology governs the structure of active copper-oxo species, which, in turn, determines the activity of the material and the nature and distribution of the formed products. 257 Methane overoxidation over copper-exchanged MFI takes place even at low temperature, indicating high intrinsic activity and low selectivity of [Cu2(µ-O)] 2+ species, stabilized by this framework. In contrast, copper-exchanged MOR selectively converts methane into partial oxidation products such as CH3OH and except CO2, at temperatures below 500 K, possibly due to the low concentration of copper dimers.…”