Effect of the support properties in dehydrogenation of biphenyl-based eutectic mixture as liquid organic hydrogen carrier (LOHC) over Pt/Al2O3 catalysts

Hydrogenation of dibenzyltoluene and the catalytic performance of Pt/ Al 2 O 3 with various Pt loadings for hydrogen production from perhydro‐dibenzyltoluene

“…53 However, the uptake rate might be limited by mass transfer of substrates in this study beyond 180 C since there is no evidence of a further increase in reaction rate from 170 C. The mass transfer limitation was reported in solution phase hydrogenation of 9-ethylcarbazole which is also a LOHC. 54 Moreover, the hydrogenation of 9-ethylcarbazole was reported using Raney-Ni, 43,54 and they also reported that the activity of Raney-Ni was decreased when the temperature was increased beyond 180 C. The reaction pressure also has a profound impact on the hydrogenation reaction. In order to find the effect of pressure, the hydrogenation of H0-DBT was conducted within a pressure range of 3 to 7 MPa at an optimal temperature of 170 C and a stirring speed of 800 rpm.…”

“…Furthermore, the effect of different metal loadings of 1% and 5% of Pt supported on carbon was investigated by Bruckner et al 28 and 1% loading was found to be the optimal loading. Shi et al 27 41 The dehydrogenation of the biphenyl-based eutectic mixture (BPDM, 35 wt% Biphenyl and 65 wt% Diphenylmethane) was used by Kwak et al 43 They studied the dehydrogenation of BPDM over Pt/Al 2 O 3 catalyst and elucidated that 90% of the stored hydrogen was produced. Garidzirai et al 44 investigated the activity of the Pt/Al 2 O 3 for dehydrogenation of H18-DBT.…”

“…The most commonly used reactor for hydrogenation and dehydrogenation studies is the batch stirrer reactor. 27,28,[36][37][38][39][40][41][42][43][44] In this study, hydrogenation and dehydrogenation experiments were carried out using Raney-Ni and 1% Pt/C, 1% ~5% Pt/Al 2 O 3 catalysts, respectively. For hydrogenation reaction, the effect of various temperatures, and pressures were examined.…”

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

“…Hydrogenation and dehydrogenation of H x -DBT takes place under specific conditions (temperature, pressure); therefore, proper heat management and reactor type play crucial roles in hydrogen production and storage. Different reactor concepts exist for LOHC hydrogenation and dehydrogenation including a fixed bed reactor, , membrane reactor, pulse-spray reactor, − heat exchanger reactor, − thin liquid film state microstructured reactor, − and monolithic reactor. , However, studies of H x -DBT hydrogenation and dehydrogenation are mainly focused on hot pressure swing reactors and microstructured, membrane, and fixed bed reactors as described below.…”

Investigation of a hydrogen generator with the heat management module utilizing liquid‐gas organic phase change material

“…However, reactor concepts utilizing liquid‐gas PCMs for near‐isothermal operation in the medium temperature range (200°C‐300°C) have seldom been experimentally studied despite their importance. Considering the growing interest in hydrogen production from organic hydrogen carriers (eg, methanol, ethanol, or DME reforming, methylcyclohexane, biphenyl, or perhydro‐dibenzyltoluene [H18‐DBT] dehydrogenation), 26‐30 it is aimed to develop a highly efficient and scalable hydrogen generator by adopting a liquid‐gas organic PCM operable in the medium temperature range. The advanced thermal management unit assisted by a liquid‐gas organic PCM can effectively homogenize the catalytic bed temperature, where highly endothermic dehydrogenation reactions occur.…”