CuO-Ns 催化氨硼烷水解制氢的性能分析

Performance analysis of CuO-Ns catalyzed hydrolysis of ammonia borane for hydrogen production

摘要:

氨硼烷(NH3BH3,AB)作为最简单的B-N化合物,结构简单,分子量轻,仅为30.7 g/mol,储氢量高达19.6 wt%,成为目前最理想的液相储氢材料之一。制备一种具有高选择性和高稳定性的催化剂是实现 AB 水解制氢的关键。本文采用在高浓度的碱性溶液下,通过溶剂热法合成具有纳米缺陷的氧化铜纳米片(CuO-Ns),并探究通过改变制备过程中的水热温度和时间,得到具有不同形貌的催化剂。探究结果表明,当水热温度为 373 K,水热时间为 12 h 时,催化剂的形貌为纳米片状,催化活性最佳,反应转化频率(TOF)值最大,此时催化剂的 TOF 值为 395.6 h-1, AB 制氢速率与 AB 浓度以及催化剂浓度呈现正相关。

Abstract:

Ammonium borane (NH3BH3, AB), as the simplest B-N compound, has a simple structure, a light molecular weight of only 30.7 g/mol, and a hydrogen storage capacity of up to 19.6 wt%, making it one of the most ideal liquid phase hydrogen storage materials at present.The key to achieving efficient hydrogen production is the preparation of catalysts with high selectivity and stability.This article adopts a solvothermal method to synthesize copper oxide nanosheets (CuO-Ns) with nano defects in a high concentration alkaline solution, and explores the preparation of catalysts with different morphologies by changing the hydrothermal temperature and time during the preparation process.The investigation results show that when the hydrothermal temperature is 373 K and the hydrothermal time is 12 hours, the morphology of the catalyst is nanosheets, with the best catalytic activity and the highest reaction conversion frequency (TOF) value. At this time, the TOF value of the catalyst is 115.21 h-1, and the AB hydrogen production rate is positively correlated with the AB concentration and catalyst concentration.