Novel Catalysts for Dibenzyltoluene as a Potential Liquid Organic Hydrogen Carrier Use—A Mini-review

Abstract

The utilization of pure and valuable energy carriers such as hydrogen is becoming important in various applications, especially in the automotive fuel cell industry. However, as a result of the properties and character of hydrogen, its storage is not easy. Therefore, there is a need for systems such as liquid organic hydrogen carriers (LOHCs), which fulfill safety standards and are a flexible medium for the storage and transmission of sustainable energy. The heat transfer oil dibenzyltoluene is a novel LOHC system which can offer superior hydrogen storage capacity. Dibenzyltoluene has a good thermal stability and excellent physicochemical properties for LOHC applications in industry (Hydrogenation of the liquid organic hydrogen carrier compound dibenzyltoluene – reaction pathway determination by 1H NMR spectroscopyReact. Chem. Eng.20161313320). In this Review, the experimental study of dibenzyltoluene with the use of catalysts and the theoretical study of dibenzyltoluene through computational modeling and simulations are explored and discussed. The focus is on heterogeneous catalysts which can be used in hydrogenation and dehydrogenation of dibenzyltoluene.

Assessing the waste heat recovery potential of liquid organic hydrogen carrier chains

“…Previous LOHC studies mainly focused on the chemical, physical, and material aspects of LOHC hydrogenation and dehydrogenation [30][31][32][33][34][35][36], the estimation of thermochemical and thermophysical properties [37][38][39][40][41][42][43][44][45][46][47], or the development of new LOHC pairs [45][46][47][48][49][50][51]. However, the thermal issue also plays a vital role in the LOHC system compared with traditional methods such as CHG and LH.…”

Toward a Hydrogen Economy: Development of Heterogeneous Catalysts for Chemical Hydrogen Storage and Release Reactions

“…218 Another potential LOHC is the dibenzyltoluene (DBT) and octadecahydro (or "perhydro-")dibenzyltoluene (H 18 -DBT) pair, which provides reasonable hydrogen storage capacity (6.2 wt%) and is reported to be less toxic. 60 In 2014, Wasserscheid and co-workers reported a hydrogen storage−release method based on benzyltoluene or DBT mixtures using two different catalysts: (a) Ru/Al 2 O 3 (5 wt%) for the hydrogenation step and (b) Pt/C (1 wt%) for the dehydrogenation reaction. 220 In 2017, the same group introduced another catalyst for hydrogenation of DBT and dehydrogenation of H 18 -DBT.…”

Recent Progress on Hydrogen Storage and Production Using Chemical Hydrogen Carriers

“…The saturation of hydrogen-lean H0-DBT to hydrogen-rich H18-DBT is a catalytic process carried out at high pressure and elevated temperatures, which depend on the type of used catalyst (Table 9). Typically, noble-metal-derived, eggshell catalysts are applied due to their high activity and selectivity [152]. Ru-and Rh-bearing materials are usually suitable for catalyzing the reaction at temperatures below 220 • C, whereas Pt-based catalysts are used for hydrogenation above 220 • C [20].…”