Carbon Dioxide Conversion of Biogas with Producing Syngas Over the Polymetallic Supported Catalysts

The polymetallic Co-based alumina supported catalysts with additives of VIII group metal and rare earth element were synthesized and tested in biogas conversion. As a feed a model mix corresponding to the biogas produced by anaerobic fermentation of horse manure and containing carbon monoxide and hydrogen as well as water vapour has been used. Some amount of carbon dioxide has been added to adjust the composition of biogas to a ratio of a CH₄:CO₂ = 1:1. The biogas conversion was carried out in a flow laboratory reactor operated at atmospheric pressure. Gas hourly space velocity (GHSV) was 1000 h⁻¹. The effects of the amount of rare earth metal and presence of carbon monoxide, hydrogen, and steam in a feed on biogas conversion over the Co-M₁-M₅/Al₂O₃ catalysts were studied at varied temperature. The catalysts perform the high activity in biogas conversion. At 740 °C, the CO₂ completely converted, while the CH₄ conversion is higher than 96 %. Syngas is a main reaction product. Under these conditions, the H₂/CO ratio is 1.1–1.2. The catalysts are the high stable in the biogas conversion.