Abstract
Co–Zn/NC was prepared by a sacrificial template self-reduction method with zeolitic imidazolate frame-8 (ZIF-8) impregnating the Co2+ as the precursor. At 125 °C for 2.5 h, furfural was completely converted to furan-2-ylmethanol (FM) over Co17Zn/NC600, while FM selectivity over Co/NC600 is only 70.6%. According to multiple characterizations, Co17Zn/NC600 (Co loading 17%, calcined at 600 °C) consists of flower-like spherical Co3ZnC nanoparticles (NPsCo3ZnC) uniformly distributed on its surface. The NPsCo3ZnC are the main active ingredients for highly selective furfural hydrogenation to FM, which is confirmed by furfural hydrogenation over Co–Zn/NC prepared with different Co loadings and different calcination temperatures. The excellent activity and stability of Co17Zn/NC600 were confirmed by recycling experiment and furfural conversion is still above 90% after repeated use of Co17Zn/NC600 for 8 cycles.
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