A stable flow hydrogen production of sodium borohydride hydrolysis using millimeter-scale Ru/Al2O3 spheres as catalyst
Source abstract
Abstract
In this study, we investigated the performance of continuous flow hydrogen production from NaBH 4 hydrolysis by loading Ru onto millimeter-scale Al 2O 3 spheres (0.5–1 mm in diameter) (Ru/m-Al 2O 3 ) using a simple impregnation method. The results from transmission electron microscopy (TEM) and N 2 adsorption and desorption revealed that Ru particles, with an average size of 2.73 nm, were evenly distributed on the Al 2O 3 spheres, and the catalysts exhibited a typical mesoporous structure. The study investigated the impact of Ru loading, catalyst quantity, catalyst reduction temperature, hydrogen production temperature, feeding rate, and concentrations of NaBH 4 and NaOH on the rate of hydrogen production (HPR). The evaluation of hydrogen production revealed that the top-performing Ru/m-Al 2O 3 catalyst achieved a HPR of 22.44 L min –1 g Ru –1 at 30 °C, with an apparent activation energy ( E a) of 33.98 kJ mol –1 . The catalyst could continuously produce hydrogen for 1700 min with a 20 % decrease in activity. The characterization results before and after hydrogen production revealed that Ru/m-Al 2O 3 exhibited excellent structural stability after a prolonged period of hydrogen production, with no apparent changes in its morphology, crystal structure, Ru particle size, and pore structure. In addition, the X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), and hydrogen production performance results showed that the flow system could effectively prevent the aggregation of NaBO 2 on the catalyst`s surface, thereby significantly improving the hydrogen production activity.
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Research context
OpenAlex topics: Hydrogen Storage and Materials · Catalysis and Hydrodesulfurization Studies · Ammonia Synthesis and Nitrogen Reduction
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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