采用一种简单的浸渍-还原工艺制备出镍-铱/氧化铝(Ni-Ir/Al₂O₃)负载型催化剂用于水合肼(N₂H₄·H₂O)催化分解制氢。该催化剂是将活性组分Ni-Ir负载于颗粒状Al₂O₃载体上制备而成，采用TEM、XRD、XPS、BET和H₂-TPD等对其结构进行表征，并结合N₂H₄·H₂O催化分解制氢实验开展了催化剂配方优化、催化反应动力学及循环耐久性研究。结果表明，粒径2~4 nm的Ni-Ir合金活性金属均匀负载于Al₂O₃载体表面，Ni₆₀Ir₄₀/Al₂O₃催化剂在293~353 K温度范围内均表现出优异的肼催化分解活性(> 200 h^-1)，在该宽温域范围内的制氢选择性高达99%以上，且该催化剂具有优异的耐久性，在303 K条件下循环5 cyc后仍保持99%以上的氢选择性，而反应速率仅由249.2 h^-1略减至225.0 h^-1，活性衰减约9.7%。此外，对N₂H₄·H₂O分解制氢反应动力学及各相关参数的影响进行了研究，包括温度、N₂H₄·H₂O浓度、NaOH助剂浓度和催化剂用量，得到其反应动力学方程为r = -k[N₂H₄·H₂O]^0.346/0.054[NaOH]^0.307[Catalyst]^1.004，并初步探究了催化剂在制氢反应过程的活性衰减原因。

Hydrogen is clean energy that can replace traditional fossil fuels in the future because of its high energy density, easy recharging, and availability of current liquid fuel infrastructure. However, the polymer-electrolyte membrane fuel cell requires controlled storage and efficient hydrogen release. Recently, liquid-phase chemical hydrogen storage materials with high gravimetric hydrogen density have emerged as promising candidates to overcome such challenges. Among these materials of interest, hydrous hydrazine (N₂H₄·H₂O) is the best candidate; however, it has not been fully explored as an alternative for chemical hydrogen storage applications. A catalyst is essential to hydrogen production at a sufficient reaction rate for N₂H₄·H₂O-based hydrogen generation systems. In this study, a series of supported Ni_{100 - x} Ir _x /Al₂O₃ catalysts were prepared using simple impregnation, roasting, and reduction method. The effect of reaction conditions on the activity and selectivity was evaluated in decomposing N₂H₄·H₂O to hydrogen. The phase/structure of the catalysts was characterized using XRD, TEM, XPS, BET, and H₂-TPD to gain insight into the catalytic performance of the Ni_{100 - x} Ir _x /Al₂O₃ catalysts. It indicated that the Ni₆₀Ir₄₀/Al₂O₃ catalyst, comprising Ni-Ir alloy nanoparticles with an average size of 2-4 nm and crystalline γ-Al₂O₃, exhibited excellent catalytic activity (> 200 h^-1) and selectivity (> 99%) toward hydrogen generation from N₂H₄·H₂O at different temperatures, from 293 K to 353 K. The Ni₆₀Ir₄₀/Al₂O₃ catalyst is durable and stable; however, the catalytic activity decreased from 249.2 to 225.0 h^-1 (~9.7%) after five runs with 99% H₂ selectivity at 323 K toward the dehydrogenation of N₂H₄·H₂O. In addition, parameters, such as temperature, N₂H₄·H₂O and NaOH concentration, and catalyst mass on N₂H₄·H₂O decomposition were investigated over the Ni₆₀Ir₄₀/Al₂O₃ catalyst. The kinetic rate equation for catalytic decomposition of N₂H₄·H₂O could be represented using the following expression: r = -k[N₂H₄·H₂O]^0.346/0.054[NaOH]^0.307[Catalyst]^1.004, where k = 4.62 × 10⁹exp(-5088.49 / T). The results could provide a theoretical foundation for applying N₂H₄·H₂O as a promising hydrogen storage material.