Reforming of Biogas over Co- and Cu-Promoted Ni/Al۲O۳-ZrO۲ Nanocatalysts Synthesized via Sequential Impregnation Method

Utilization of active and stable catalyst could have enormous advantages in industrial application of biogas reforming. In order to achieve this goal, the effects of Cu and Co as promoters were investigated over physical-chemical properties of Ni/Al۲O۳-ZrO۲ catalyst in reforming of biogas. The sequential impregnation was used for preparation of catalysts. The catalysts were characterized using XRD, FESEM, BET and FTIR analysis. The XRD patterns displayed that the active phases promoters could be effective on nanoparticles dispersion. The FESEM images showed that uniformity of particles size was improved for bimetallic catalysts in comparison with Ni/Al۲O۳-ZrO۲ catalyst but the specific surface areas had no significant change in BET analysis. Higher content of –OH structural groups on surface of Ni-Co/Al۲O۳-ZrO۲ catalyst were proved by FTIR characterization. The performances of catalysts were assessed at atmospheric pressure, feed gas ratio of CO۲/CH۴= ۱, GHSV=۲۴ l/g.h and temperature ranges from ۵۵۰-۸۵۰°C. The results revealed Ni-Co/Al۲O۳-ZrO۲ catalysts had the best activity. Because of optimized operating condition and application of ZrO۲ as a promoter, the activities of all catalysts remained stable at ۸۵۰°C for ۲۴ h.

کلیدواژه ها:

Dry Reforming ، Biogas ، Syngas ، Promoted Ni/Al۲O۳- ZrO۲ ، Impregnation