The methane dry reforming reaction was conducted using a combination of lamellar vermiculite molecular sieve and highly active perovskite catalyst

Abstract

Dry reforming of methane (DRM) enables the conversion of two greenhouse gases, CH4 and CO2, into syngas, offering remarkable environmental and economic benefits. The primary challenge in this process lies in maintaining the catalyst's high catalytic activity and stability. In this study, natural vermiculite (VMT) was employed to modify the layer carrier with a large specific surface area and suitable pore size. By combining the structural characteristics of perovskite, we synthesized the LaNiO3/VMT-SiO2 perovskite catalyst using the citric acid complex method for methane dry reforming reaction. The results demonstrate that at T = 750 °C and GHSV = 36,000 mL/(h·gcat), the catalyst exhibits excellent activity (achieving maximum conversions of 82% for CO2 and 90% for CH4) as well as stability (up to 24 h). Characterization techniques such as XRD and TEM revealed that the catalyst possesses exceptional catalytic activity and stability due to its horizontally distributed active component Ni within perovskite. Through pretreatment, we obtained an active component Ni with small particle size and uniform dispersion along with a carrier featuring a large specific surface area. Furthermore, alkaline La2O3 in the reduced catalyst enhances its carbon resistance.