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Trimetallic nanocatalysts to enhanced hydrogen production from hydrous hydrazine: The role of metal centers
International Journal of Hydrogen Energy ( IF 7.2 ) Pub Date : 2020-04-06 , DOI: 10.1016/j.ijhydene.2020.03.093
Khloud Saeed Al-Thubaiti , Zaheer Khan

A simple low-cost cetyltrimethylammonium bromide (CTAB) assisted step-wise metal displacement plating method was used to prepare noble-and noble-metal free Ni/Fe/Pd, Ni/Fe/Ag and Ni/Fe/Cu nickel based nanocatalysts for the hydrogen production from complete hydrazine decomposition in basic solution at mild temperature. Pd/Ag/Ni was prepared by seedless method. Compared to the mono-metallic (Ag0, Pd0, Fe0, Ni0 and Cu0) and bi-metallic (Pd/Ag, Ag/Ni and Ni/Fe), the tri-metallic catalyst exhibits higher catalytic performance towards hydrazine decomposition. The nessler's reagent was used to detect the formation of ammonia during hydrazine dehydrogenation. The effect of [catalyst], [hydrazine], [NaOH] and temperature were determined on hydrogen generation by using Ni/Fe/Pd. The generation of hydrogen follows excellent first-order kinetics with [hydrazine]. The activation energies were determined to be 32.1, 42.3, 44.6 and 75.9 kJ/mol for Ni/Fe/Pd, Ni/Fe/Ag, Ni/Fe/Cu and Pd/Ag/Ni, respectively. Noble-metal nickel based Ni/Fe/Pd nanocatalyst shows better catalytic efficiency and hydrogen selectivity. The durability of Ni/Fe/Pd provides evidence to excellent catalytic degree for five kinetic runs. The morphology of Ni/Fe/Pd was determined by using FESEM, EDX, TEM, XRD and UV–visible spectroscope. Hydrazine dehydrogenation mechanism proposed, which follows the following rate-law:

d[hydrazine]dt=k1KadOH]Ni@Fe@Pd][NH2NH2]T1+Kb[OH]+Kad[NH2NH2]T



中文翻译:

三金属纳米催化剂可提高含水肼的产氢量:金属中心的作用

采用一种简单的低成本十六烷基三甲基溴化铵(CTAB)辅助的逐步金属置换电镀方法,制备了无贵金属和无贵金属的Ni / Fe / Pd,Ni / Fe / Ag和Ni / Fe / Cu镍基纳米催化剂。在温和的温度下在碱性溶液中肼完全分解产生的氢气。Pd / Ag / Ni采用无籽法制备。与单金属(Ag 0,Pd 0,Fe 0,Ni 0和Cu 0)和双金属(Pd / Ag,Ag / Ni和Ni / Fe)时,三金属催化剂对肼分解表现出更高的催化性能。塞纳氏试剂用于检测肼脱氢过程中氨的形成。通过使用Ni / Fe / Pd确定了[催化剂],[肼],[NaOH]和温度对产氢的影响。氢的生成与[肼]遵循出色的一级动力学。对于Ni / Fe / Pd,Ni / Fe / Ag,Ni / Fe / Cu和Pd / Ag / Ni,活化能分别确定为32.1、42.3、44.6和75.9 kJ / mol。贵金属镍基Ni / Fe / Pd纳米催化剂表现出更好的催化效率和氢选择性。Ni / Fe / Pd的耐久性为五次动力学运行提供了出色的催化度证据。Ni / Fe / Pd的形貌通过FESEM,EDX,TEM,XRD和紫外可见光谱仪。提出了肼脱氢机理,其遵循以下速率规律:

-d[Hÿd[R一种ž一世ñË]dŤ=ķ1个ķ一种dØH-]ñ一世@FË@Pd][ñH2-ñH2]Ť1个+ķb[ØH-]+ķ一种d[ñH2-ñH2]Ť

更新日期:2020-04-06
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