Evaluation of bimetallic Pt–Co and Pt–Ni catalysts in LOHC dehydrogenation

Hydrogen Loading and Release Potential of the LOHC System Benzyltoluene/Perhydro Benzyltoluene over S–Pt/TiO2 Catalyst

“…From the DOD or DOH, productivity for a given reaction range a to b can be calculated (eq ) to provide a base for quantitative comparison of reactions with different amounts of the active species platinum and different reaction times. ,,, P a − b ( t ) = Δ m H 2 , a − b m Pt × ( t b − t a ) = n H 2 , max × ( DOH b − DOH a ) × M H 2 m Pt × ( t b − t a ) …”

“…From the DOD or DOH, productivity for a given reaction range a to b can be calculated (eq ) to provide a base for quantitative comparison of reactions with different amounts of the active species platinum and different reaction times. ,,, …”

“…As soon as hydrogen is required, it is released by catalytic dehydrogenation of the loaded LOHC + , while the unloaded carrier LOHC – is further reused in another hydrogen storage cycle. ,,− Suitable LOHC systems include cyclic hydrocarbons such as dibenzyltoluene (H0-DBT)/perhydro dibenzyltoluene (H18-DBT), benzyltoluene (H0-BT)/perhydro benzyltoluene (H12-BT), diphenylmethane (DPM)/dicyclohexylmethane, or benzophenone (BP)/dicyclohexylmethanol. ,,, The use of the DBT- and BT-based systems is highly attractive, as these are well-established heat transfer oils and show beneficial thermal stability as well as availability on a technical scale. , In general, 57 kg H 2 can be stored per 1 m 3 of H18-DBT, while the storage capacity of H12-BT is 54 kg H 2 per 1 m 3 . , However, H18-DBT suffers from a high dynamic viscosity (790 mPa s at 15 °C) leading to challenges in its applicability. On the contrary, the dynamic viscosity of H12-BT is low (8 mPa s at 15 °C) and makes it a highly attractive LOHC system. − For the hydrogenation (loading) and dehydrogenation (unloading) of LOHC systems based on cyclic hydrocarbons, platinum nanoparticles supported on aluminum or titanium oxides have been reported as suitable catalysts. ,,,− However, low-coordinated sites on the Pt-nanoparticles as well as surface functionalities of the support can catalyze undesired side reactions such as cracking, cyclization, and polymerization . These can be suppressed by selective sulfur poising of low-coordinated sites of platinum. ,,, Using S–Pt/Al 2 O 3 in cycles of loading and unloading of BT, the amount of cracking products obtained was less than 0.1% and the formation of side products with high boiling points was reduced as well .…”

Advances in liquid organic hydrogen carriers: developing efficient dehydrogenation strategies

“…5A). 63 The results indicated that the addition of a small amount of cobalt enhanced catalytic performance.…”

Palladium‐Silver Alloys Deposited on Different Carriers for Dehydrogenation of Formic Acid

“…[9][10][11] Solid hydrogen storage materials and gaseous hydrogen storage materials have technical problems such as transportation and utilization, and thus it is the most effective method of utilizing the liquid organic hydrogen carriers (LOHCs) as hydrogen carriers to initiate the release of H 2 on-site. [12][13][14] Formic acid (FA), methanol, hydroborane, hydrazine hydrate, and sodium borohydride are common LOHCs. FA, prepared by CO 2 reduction and biomass conversion, exhibited the mass hydrogen storage density of 4.4 wt % and the volumetric hydrogen storage density of 53 g L À 1 , which is five times as the capacity of common lithium-ion batteries currently on the market.…”