Kinetics of Sodium Borohydride Hydrolysis in Comparison with Ammonia Borane Using Cobalt Catalysts

IF 0.5 Q4 PHYSICS, CONDENSED MATTER

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI:10.1134/S102745102470071X

N. Ya. Dyankova, N. V. Lapin, V. V. Grinko, V. S. Bezhok, A. F. Vyatkin

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Abstract

The kinetics of sodium borohydride catalytic hydrolysis with cobalt catalysts Co₃O₄/ZnO, Co/ZnO, Co₃O₄/zeolite, Co/zeolite, Co(OH)₂, Co₃O₄, and Co–B was studied, and the kinetic characteristics of the process were compared with the same characteristics of the catalytic hydrolysis of ammonia borane. The concentrations of sodium borohydride and NaOH in aqueous solution in all cases were 0.064 and 0.06 M, respectively. The apparent activation energy and the rate of hydrogen evolution during the sodium borohydride hydrolysis in the temperature range of 35–80°C were determined in each case. The kinetic data were processed using zero-order, first-order, and Langmuir–Hinshelwood reaction models. The apparent activation energies for the sodium borohydride hydrolysis ranged from 37.0 for Co₃O₄ to 72.6 kJ/mol for Co₃O₄/ZnO. These values exceeded similar values for the ammonia borane hydrolysis, which were in the range of 26.0–47.4 kJ/mol. A higher rate of hydrogen evolution was observed during the sodium borohydride hydrolysis compared to ammonia borane when using these catalysts, except for Co–B and Co/ZnO catalysts. The maximum rates of hydrogen evolution 3510 and 3140 mL of H₂ (g cat)^–1 min^–1 were observed when using Co(OH)₂ and Co–B catalysts, respectively.

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硼氢化钠水解动力学与使用钴催化剂的氨硼烷的比较

研究了钴催化剂 Co3O4/ZnO、Co/ZnO、Co3O4/沸石、Co/沸石、Co(OH)2、Co3O4 和 Co-B 催化水解硼氢化钠的动力学，并将该过程的动力学特征与催化水解硼烷氨的相同特征进行了比较。在所有情况下，水溶液中硼氢化钠和 NaOH 的浓度分别为 0.064 和 0.06 M。在 35-80°C 温度范围内，测定了硼氢化钠水解过程中的表观活化能和氢演化速率。使用零阶、一阶和 Langmuir-Hinshelwood 反应模型对动力学数据进行了处理。硼氢化钠水解的表观活化能从 Co3O4 的 37.0 kJ/mol 到 Co3O4/ZnO 的 72.6 kJ/mol。这些值超过了氨硼烷水解的类似值，即 26.0-47.4 kJ/mol。除 Co-B 和 Co/ZnO 催化剂外，在使用这些催化剂时，硼氢化钠水解过程中的氢进化速率高于硼烷氨水解过程中的氢进化速率。使用 Co(OH)2 和 Co-B 催化剂时，氢气进化的最大速率分别为 3510 和 3140 mL H2 (g cat)-1 min-1。

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来源期刊

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques PHYSICS, CONDENSED MATTER-

CiteScore

0.90

自引率

25.00%

发文量

144

审稿时长

3-8 weeks

期刊介绍： Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.