Efficient dehydrogenation of a formic acid–ammonium formate mixture over Au₃Pd₁ catalyst
2019
Guo, Xiao-Tong | Zhang, Juan | Chi, Jian-Chao | Li, Zhi-Hui | Liu, Yuzhen | Liu, Xin-Ru | Zhang, Shu-Yong
A series of AuPd/C catalysts were prepared and tested for the first time for active and stable dehydrogenation of a formic acid–ammonium formate (FA–AF) mixture. The catalysts with different Au-to-Pd molar ratios were prepared using a facile simultaneous reduction method and characterized using transmission electron microscopy (TEM), high-resolution TEM, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. It was found that the catalytic activity and stability of the Au₃Pd₁/C catalyst was the best. The initial turnover frequency for the dehydrogenation of the FA–AF mixture over the Au₃Pd₁/C catalyst can reach 407.5 h⁻¹ at 365 K. The reaction order with respect to FA and AF is 0.25 and 0.55, respectively. The apparent activation energy of dehydrogenation is 23.3 ± 1.3 kJ mol⁻¹. The catalytic activity of the Au₃Pd₁/C catalyst remains ca. 88.0% after 4 runs, which is much better than the single Pd/C catalyst. The mechanism for the dehydrogenation is also discussed.
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