Effects of Preparation Method on the Structure and Catalytic Activity of Ag–Fe2O3 Catalysts Derived from MOFs

Xiaodong Zhang,Yang Yang,Lifeng Cui,Yuxin Wang,Xutian Lv

doi:10.3390/catal7120382

Abstract

In this work, Ag–Fe2O3 catalysts were successfully prepared using several different methods. Our main intention was to investigate the effect of the preparation methods on the catalysts’ structure and their catalytic performance for CO oxidation. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption–desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2-temperature program reduction (H2-TPR) and inductively coupled plasma optical emission spectroscopy (ICP-OES). Ag–Fe catalysts prepared by impregnating Ag into MIL-100 (Fe) presented the best catalytic activity, over which CO could be completely oxidized at 160 °C. Based on the characterization, it was found that more metallic Ag species and porosity existed on Ag–Fe catalysts, which could efficiently absorb atmospheric oxygen and, thus, enhance the CO oxidation.

Highlights

Carbon monoxide catalytic oxidation is a typical model for catalyst studies due to its relatively simple surface bimolecular reaction
Ag on transition metal oxide is beneficial to catalytic reactions, such as NOx abatement [42], ethylene epoxidation [43,44], and methane oxidation the supporting exploration Ag focusing on various oxides‐supported
(iii) The Fe2 O3 was used as the carrier, which derived from MIL-100 (Fe) with calcination for 2 h at 430 ◦ C in a muffle furnace [30], and the silver was impregnated into the Fe2 O3 as before, while the final catalyst was denoted as Ag–Fe2 O3 . iv) Commercial Prussian blue (C18 Fe7 N18 ) was used as the support, and the silver was loaded by the impregnation method as before which was denoted as

Summary

Introduction

Carbon monoxide catalytic oxidation is a typical model for catalyst studies due to its relatively simple surface bimolecular reaction. Ag on transition metal oxide is beneficial to catalytic reactions, such as NOx abatement [42], ethylene epoxidation [43,44], and methane oxidation the supporting exploration Ag focusing on various oxides‐supported. The exploration focusing on various oxides-supported Ag catalysts has It isincreasing well established attracted interest.that the preparation method has a significant influence on the structural properties and performance of the catalyst. The modifications of theinfluence surface area, particle size, It is well established that the preparation has a significant on the structural dispersion of the active component, and strength of the interaction between the active phase and the properties and performance of the catalyst.

Characterization of Catalysts

It isitwell thatin the smallest size ofon

Catalyst Preparation

Advance

Catalytic Activity Measurements

Conclusions