Cu/ZnO/Al₂O₃系触媒を用いたメタノールの酸化的改質による水素製造—Pdドープによる耐久性の向上と自己活性化能の発現—

Abstract

The autothermal reforming (ATR) of methanol was performed using the Cu/ZnO/Al2O3-based catalysts for the catalytic production of hydrogen. The Cu/ZnO/Al2O3 (CZA) catalyst exhibited a high hydrogen production rate during ATR even at a low external heating temperature of 100 °C. In the O2 on/off durability test, although the hydrogen production rate of CZA gradually decreased owing to copper aggregation, the Pd-doped Cu/ZnO/Al2O3 (Pd-CZA) catalyst maintained a high hydrogen production rate. The reduction temperature of copper in Pd-CZA was found to be significantly lower than that in CZA, indicating that the reduction of copper in Pd-CZA takes place more easily. Thus, the aggregation of copper during the O2 on/off durability test was remarkably suppressed due to the fact that the reduction of copper in Pd-CZA occurred at a lower temperature than in CZA. Moreover, the Pd-CZA catalyst was self-activated under ATR conditions without the requirement for reduction pretreatment using hydrogen.

Novel Cu and Pd-Cu Catalysts Supported on Multi-Walled Carbon Nanotubes for Steam Reforming and Decomposition of Methanol

“…In addition, the kinetic studies showed that the addition of palladium decreased the activation energy for steam reforming of methanol, which agrees well with our activity results. Nomoto et al [56] studied Cu and Pd-Cu catalysts in the autothermal reforming of methanol process after calcination and after reduction. In the case of the autothermal reforming (ATR) of methanol process carried out on the copper catalysts, only trace amount of hydrogen production was detected.…”