Yousef Ayman, Maafa Ibrahim M, Abutaleb Ahmed, Matar Saleh M, Alamir Ahmed A, El-Halwany M M
Department of Chemical Engineering, College of Engineering and Computer Sciences, Jazan University, Jazan 11451, Saudi Arabia.
Engineering and Technology Research Center, Jazan University, P.O. Box 114, Jazan 82817, Saudi Arabia.
Polymers (Basel). 2024 Dec 19;16(24):3541. doi: 10.3390/polym16243541.
Bimetallic NiCr nanoparticles decorated on carbon nanofibers (NiCr@CNFs) were synthesized through electrospinning and investigated as catalysts for hydrogen generation from the dehydrogenation of sodium borohydride (SBH). Four distinct compositions were prepared, with chromium content in the catalysts ranging from 5 to 25 weight percentage (wt%). Comprehensive characterization confirmed the successful formation of bimetallic NiCr@CNFs. Notably, among the compositions, the catalyst containing 20 wt% Cr exhibited the highest efficiency in SBH dehydrogenation. Kinetic studies revealed that hydrogen production followed a first-order reaction with respect to the catalyst quantity. Additionally, the reaction time decreased with increasing temperature. The activation energy (Ea), entropy change (ΔS), and enthalpy change (ΔH) were calculated as 34.27 kJ mol, 93.28 J mol·K, and 31.71 kJ mol, respectively. The improved catalytic performance is attributed to the synergistic interaction between Ni and Cr. This study proposes a promising strategy for the advancement of Ni-based catalysts.
通过静电纺丝法合成了负载在碳纳米纤维上的双金属镍铬纳米颗粒（NiCr@CNFs），并将其作为硼氢化钠（SBH）脱氢制氢的催化剂进行了研究。制备了四种不同组成的催化剂，其中铬在催化剂中的含量为5至25重量百分比（wt%）。综合表征证实成功制备了双金属NiCr@CNFs。值得注意的是，在这些组成中，含20 wt% Cr的催化剂在SBH脱氢反应中表现出最高的效率。动力学研究表明，产氢量与催化剂用量呈一级反应。此外，反应时间随温度升高而缩短。计算得到的活化能（Ea）、熵变（ΔS）和焓变（ΔH）分别为34.27 kJ/mol、93.28 J/(mol·K)和31.71 kJ/mol。催化性能的提高归因于Ni和Cr之间的协同相互作用。本研究为镍基催化剂的改进提出了一种有前景的策略。
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