Preparation of Vermiculite-based Ni-phyllosilicate for Dry Reforming of Methane

Yufan Huang,Xiaofeng Zhu,Teng Zhao,Zijun Wang

doi:10.37358/rc.21.4.8460

Abstract

Layered porous SiO2 (V-SiO2) was designed and prepared from vermiculite by expansion-acidification method, and then used as a catalyst support to prepare Ni/V-SiO2 for dry reforming of methane. It is well known that sintering and carbon deposition of metal particles are two main problems in deactivation of nickel-based catalysts for methane dry reforming. It is reported that strong metal support interaction is a possible solution. Here, a Ni/V-SiO2-H catalyst derived from Ni-phyllosilicate was developed, and compared with the catalyst Ni/V-SiO2-IM by impregnation method. The results showed that the Ni/V-SiO2-H catalyst had high catalytic activity and stability, and the CH4 conversion reached 71.7% at 700 �C. The reason is that on the one hand, the active metal particles in the catalyst are small (8.3 nm) and relatively evenly dispersed; on the other hand, the catalyst has strong metal support interaction, which improves the anti sintering ability of the catalyst and affects the catalytic activity. It is considered that V-SiO2 as a catalyst support for the preparation of Ni-phyllosilicate may have wide application.

Highlights

In recent decades, the extensive use of fossil fuels has emitted a large number of greenhouse gases into the atmosphere, which has seriously affected the earth's climate and the global ecological environment
Dry reforming of methane (DRM), as shown in Eq (1), which involves the simultaneous consumption of two greenhouse gases, i.e., methane and carbon dioxide, has been widely concerned
The specific surface area of Ni/vermiculite derived SiO2 (V-SiO2)-H is much smaller than the specific surface area of Ni/V-SiO2-IM, which may infer that occupied more pores of the support

Summary

Introduction

The extensive use of fossil fuels has emitted a large number of greenhouse gases into the atmosphere, which has seriously affected the earth's climate and the global ecological environment. Dry reforming of methane (DRM), as shown in Eq (1), which involves the simultaneous consumption of two greenhouse gases, i.e., methane and carbon dioxide, has been widely concerned. It produces syngas with a H2/CO ratio equal to 1, which is suitable for the synthesis of liquid fuel [6,7]. There are some difficult issues that lead to DRM not being widely processed in industry so far. According to the thermodynamics of DRM, it must be carried out at high temperature, which leads to catalyst deactivation due to sintering of active metal [8,9]. How to choose the right catalyst has gradually become the focus of researchers, which is still a challenge up to now [12]

Methods

Results

Conclusion