Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst,International Journal of Energy Research

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Untangling the cobalt promotion role for ruthenium in sodium borohydride dehydrogenation with multiwalled carbon nanotube‐supported binary ruthenium cobalt catalyst
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-11-24 , DOI: 10.1002/er.6226
Tulin Avci Hansu _{1,

2} , Omer Sahin ₂ , Aykut Çağlar ₁ , Hilal Demir Kivrak ₁

Affiliation

In the present study, multiwalled carbon nanotube‐supported Ru (Ru/MWCNT) and RuCo (RuCo/MWCNT) nanocatalysts with 3 wt% Ru loading were synthesized via sodium borohydride (SBH) reduction method for the dehydrogenation of SBH (R_SBH)_. These nanocatalysts were characterized with XRD, XPS, SEM–EDX, and TEM. Ru/MWCNT and Ru:Co/MWCNT catalysts with varying Ru:Co atomic ratios were prepared successfully, and electronic state of Ru:Co altered compared to Ru. R_SBH activities of these Ru/MWCNT and RuCo/MWCNT were examined in alkaline environment. RuCo/MWCNT at 80:20 atomic ratio exhibits superior H₂ evolution. Further experiments were performed with RuCo/MWCNT at 80:20 atomic ratio to determine how NaOH concentration (C_NaOH), reaction temperature (T_rxn), SBH concentration (C_SBH), and amount of nanocatalyst (M_c) affect R_SBH activities. Activation energy (Ea) was calculated using the Arrhenius equation. RuCo/MWCNT at 80:20 atomic ratio exhibits superior H₂ evolution activities compared to the literature values. Initial rate (IR) for this nanocatalyst was found as 123.9385 mL H₂ g⁻¹_cat min⁻¹. As a result of these kinetic calculations, the Ea of the nanocatalysts was calculated as 35.978 kJ/mol. The degree of reaction (n) was found to be 0.53 by trial and error. RuCo/MWCNT at 80:20 atomic ratio is a promising nanocatalyst for R_SBH.

中文翻译：

多壁碳纳米管负载的二元钌钴催化剂消除了钌在硼氢化钠脱氢中钴的促进作用

在本研究中，通过硼氢化钠（SBH）还原法合成了载有3 wt％Ru的多壁碳纳米管负载的Ru（Ru / MWCNT）和RuCo（RuCo / MWCNT）纳米催化剂，用于SBH（R _SBH）的脱氢_。这些纳米催化剂通过XRD，XPS，SEM-EDX和TEM进行了表征。成功制备了具有不同Ru：Co原子比的Ru / MWCNT和Ru：Co / MWCNT催化剂，并且与Ru相比，Ru：Co的电子态发生了变化。在碱性环境下检查了这些Ru / MWCNT和RuCo / MWCNT的R _SBH活性。RuCo / MWCNT的原子比为80:20时，H _2的析出率更高。用RuCo / MWCNT以80:20的原子比进行进一步的实验，以确定NaOH的浓度（C _NaOH），反应温度（T _rxn），SBH浓度（C _SBH）和纳米催化剂的量（M _c）影响R _SBH活性。使用Arrhenius方程计算活化能（Ea）。与文献值相比，RuCo / MWCNT的原子比为80:20表现出优异的H ₂析出活性。发现该纳米催化剂的初始速率（IR）为123.9385mL H ₂ g ^-1_cat min ^-1。这些动力学计算的结果是，纳米催化剂的Ea计算为35.978 kJ / mol。通过反复试验发现反应度（n）为0.53。原子比为80:20的RuCo / MWCNT是有前途的R纳米催化剂_SBH。

更新日期：2020-11-24

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