Wei Lei, Lu Yanhong, Lu Ruixuan, Cui Yuxin
College of Chemistry and Materials Science, Langfang Normal University Langfang 065000 P. R. China
RSC Adv. 2023 Mar 8;13(11):7614-7620. doi: 10.1039/d3ra00247k. eCollection 2023 Mar 1.
Hydrolytic dehydrogenation of ammonia borane is a significant and promising approach for on-site hydrogen production at ambient conditions, and developing highly efficient and low-cost catalysts has attracted considerable attention. Herein, waste-biomass-derived activated carbon (AC) was prepared by hydrothermal carbonization and alkali-assisted activation, and non-precious bimetal phosphides (Co-Cu-P) nanocatalysts with a series of different Co/Cu ratios were synthesized on the AC surface through phosphidation method. Owing to the synergetic effects, the optimal CoCuP/AC presents an outstanding turnover frequency of 26.5 min (25 °C), which is much higher than that of many reported catalysts. The reaction activation energy was measured to be 34.6 kJ mol. Benefiting from the ferromagnetic nature of the phosphides, the CoCuP/AC can be magnetically separated and reused again. After recycling six times, the catalyst still retains 72% of the initial activity, thus indicating great potential for practical applications.
氨硼烷的水解脱氢是一种在环境条件下现场制氢的重要且有前景的方法，开发高效低成本的催化剂已引起广泛关注。在此，通过水热碳化和碱辅助活化制备了废弃生物质衍生的活性炭（AC），并通过磷化法在AC表面合成了一系列不同Co/Cu比的非贵金属双金属磷化物（Co-Cu-P）纳米催化剂。由于协同效应，最佳的CoCuP/AC在25℃时具有26.5 min-1的出色周转频率，远高于许多已报道催化剂。测得反应活化能为34.6 kJ mol-1。受益于磷化物的铁磁性质，CoCuP/AC可以通过磁分离并再次重复使用。循环使用六次后，催化剂仍保留初始活性的72%，因此显示出巨大的实际应用潜力。
