Ni/SiO₂ Catalyst Prepared by Strong Electrostatic Adsorption for a Low-Temperature Methane Dry Reforming Reaction

Abstract

Low-temperature methane dry reforming (MDR) over supported Ni catalysts is a more economical way to convert greenhouse gases than high-temperature MDR. However, sintering from Ni aggregation and carbon deposition from deep cracking of CH4 caused catalyst deactivation. In this study, we synthesized a supported Ni/SiO2-E catalyst by strong electrostatic adsorption for low-temperature MDR (673–773 K). Experimental results showed that the Ni/SiO2-E catalyst exhibited higher performance on using low-temperature MDR than the Ni/SiO2-I catalyst prepared by the conventional impregnation method. From characterizations of X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H2-TPR), etc. in fresh catalysts and used catalysts, the excellent stable performance of MDR over the Ni/SiO2-E catalyst was associated with the smaller Ni size and the stronger Ni–SiO2 interaction. The former contributed to less formation of carbon deposits and the latter resulted in hardly any sintering of Ni nanoparticles.

Bismuth single atom supported CeO2 nanosheets for oxidation resistant photothermal reverse water gas shift reaction

“…Defects were introduced to improve the photothermal CO 2 reduction performances, 26,27 and core-shell structures were also synthesized to improve the anti-coke and anti-sintering activity of catalysts and enhance their photothermal catalytic performances. [28][29][30][31] However, investigating new catalysts with high activity and oxidation resistance simultaneously is imperative for the industrialization of photothermal RWGS, which has not yet been realized. Recently, single atom catalysts (SACs) have experienced explosive growth as the new research frontier, which shows structure and chemical robustness in many catalysis applications.…”

Highly active and stable cobalt catalysts with a tungsten carbide-activated carbon support for dry reforming of methane: effect of the different promoters

“…Simultaneously, carbon deposition caused by the methane cracking reaction (eqn (1)) and disproportionation reaction (eqn (2)) are also the main reasons for catalyst deactivation. [13][14][15] Therefore, it remains a great challenge to synthesize the DMR catalyst with excellent activity and stability. To enhance the catalytic performance of the DMR catalyst, numerous studies have been carried out on the effects of the support 16,17 and promoter 18,19 of CH 4 -CO 2 reforming catalysts.…”

Optimizing the Ni/Cu Ratio in Ni–Cu Nanoparticle Catalysts for Methane Dry Reforming

“…Moreover, the need for a high temperature tends to result in Ni nanoparticles sintering, especially the particles supported on oxides. , The drawbacks hinder stable MDR performance over most of the developed Ni catalysts. Synthesizing low carbon deposition and trace sintering Ni nanoparticles for MDR is a considerable challenge. − …”