Biogas reforming on hydrotalcite-derived Ni-Mg-Al catalysts: the effect of Ni loading and Ce promotion. (October 2019)

• Record Type: Journal Article
• Authors: Kalai, Dori Yosef; Stangeland, Kristian; Tucho, Wakshum M.; Jin, Yiying; Yu, Zhixin
• Is Part Of: Journal of CO₂ utilization. Volume 33(2019)
• Page Start: 189
• Page End: 200
• Publication Date: 2019-10
• Subjects: Biogas -- Dry reforming -- Ce-promoter -- Ni catalysts -- Hydrotalcite; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.05.011
• Languages: English
• ISSNs: 2212-9820

Abstract

Highlights: Ce promoted HT-derived Ni catalysts are effective for model biogas reforming. Initial particle sizes do not change significantly with Ni loading. Large Ni particles stimulate the methane decomposition reaction. High Ce/Ni ratio and low Ni loading yield the most active and stable catalysts. Abstract: Due to the expected large growth of biogas production, particularly in Europe, biogas utilization technology could play an important role in the near future. Direct biogas reforming through dry reforming of methane (DRM) has great potential as an intermediate step in biogas upgrading to fuels and commodity chemicals. In this work, a series of Ce-promoted Ni-Mg-Al hydrotalcite (HT) derived catalysts with different Ni loadings was prepared to study their applicability for model biogas reforming at low CO2 concentrations. The catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), H2 -chemisorption, thermogravimetric analysis (TGA) and transmission electron microscopy (TEM). Reforming of model biogas was carried out at 600 °C, 1 bar and non-diluted CO2 /CH4 = 1:3 and high GHSV. To further assess the effect of Ni loading on the Ce-promoted catalysts, DRM was studied in a temperature range of 500–800 °C. Furthermore, comprehensive post-mortem characterizations were conducted to elucidate the consequence of carbon formation and Ni sintering on the catalytic activity and stability. It was demonstrated that higher Ce/Ni ratio results in more active catalyst, which is also more resistant to sintering and coke deposition even at low concentrations of CO2 in the feed.