Bimetallic catalyst exhibits efficient and potential performance for nitrate reduction towards N₂ generation. In this work, Pd-Cu bimetallic catalysts are synthesized based on γ-Al₂O₃ with different loading sequences and annealing temperatures. The characterization of the catalysts with XRD and STEM indicates that the loading methods affect the dispersity of the catalysts. The catalyst obtains much smaller size and more uniform dispersion by first Cu load with annealing at 900 ^oC and then Pd load (Cu_1%(900 ^oC)-Pd_2.5%/γ-Al₂O₃). The dispersion of Pd and Cu reach 51.81% and 21.93%, respectively. Then the catalysts are applied for nitrate hydroreduction combined with electrocatalytic in-situ hydrogen production using PPy/Ni cathode to obtain high efficiency of H₂ utilization and N₂ selectivity. For Cu_1%(900 ^oC)-Pd_2.5%/γ-Al₂O₃, the initial reaction rate for N₂ generation is 0.70 mg L^-1 min^-1 and the TOF based on Pd is 2.13×10^-3 s^-1, which is much higher than the others, due to the best dispersion of Pd-Cu on the support. The loading amount is also optimized and the effects of current and pH are investigated to achieve the optimal performance.

双金属催化剂在硝酸盐还原生成 N ₂方面表现出有效和潜在的性能。在这项工作中，基于γ-Al ₂ O ₃合成了具有不同负载顺序和退火温度的Pd-Cu双金属催化剂。XRD和STEM对催化剂的表征表明负载方式影响催化剂的分散性。催化剂先负载Cu并在900 ^o C退火，然后负载Pd (Cu _1% (900 ^o C)-Pd _2.5% /γ-Al ₂ O ₃）。Pd和Cu的分散度分别达到51.81%和21.93%。然后将催化剂应用于硝酸盐加氢还原结合PPy/Ni阴极电催化原位制氢，以获得高效的H ₂利用率和N ₂选择性。对于Cu _1% (900 ^o C)-Pd _2.5% /γ-Al ₂ O _{3 ，N 2}生成的初始反应速率为0.70 mg L ^-1 min ^-1，基于Pd的TOF为2.13×10 ^-3小号^-1，这比其他的要高得多，这是由于 Pd-Cu 在载体上的最佳分散。还优化了负载量，并研究了电流和 pH 值的影响，以实现最佳性能。