Boosting the hydrogenation activity of dibenzyltoluene catalyzed by Mg-based metal hydrides. (5th July 2022)

• Record Type: Journal Article
• Authors: Feng, Xiaoyang; Jiang, Lijun; Li, Zhinian; Wang, Shumao; Ye, Jianhua; Wu, Yuanfang; Yuan, Baolong
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 57(2022)
• Page Start: 23994
• Page End: 24003
• Publication Date: 2022-07-05
• Subjects: Liquid organic hydrogen carriers -- Dibenzyltoluene -- Hydrogenation -- Mg-based metal hydrides -- Catalyst; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.04.234
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Hydrogenation of dibenzyltoluene (DBT) is of great significance for the application in liquid organic hydrogen carriers (LOHCs). We successfully develop Mg-based metal hydrides (Mg2 NiH4, MgH2, and LaH3 ) reactive ball-milling for the hydrogenation of DBT. Mg-based metal hydrides milled with 500 min exhibit the best catalytic activity, the hydrogen uptake of DBT can reach 4.63 wt% at the first 4 h and finally achieve 5.70 wt% through 20 h, which is the first time to use hydrogen storage material as a catalyst for the hydrogenation of DBT. The excellent catalytic hydrogenation performance of Mg-based metal hydrides mostly originates from numerous catalytic activity centers formed at the surfaces of Mg2 NiH4 nanoparticles in the MgH2 matrix. Inspired by this mechanism, more general metal hydrides can be explored for catalyzing the hydrogenation of LOHCs. The new application of Mg-based metal hydrides is beneficial to developing efficient LOHC based hydrogen storage systems and offers novel insights to hydride-based catalysts. Highlights: Mg-based metal hydrides (MgH2, Mg2 NiH4, and LaH3 ) were prepared by reactive ball-milling. Mg-based metal hydrides milled with 500 min exhibited the best catalytic hydrogenation activity of dibenzyltoluene. The maximum hydrogen uptake of dibenzyltoluene can reach 5.70 wt%. Mg2 NiH4 is a main catalytic phase in Mg-based metal hydrides.