The Role of the Metal in the Catalytic Reactions of Hydrogenation–Dehydrogenation of Polycyclic Hydrocarbons for Hydrogen Storage

Abstract

The design of benign and safe hydrogen storage systems is the priority in the development of new energy carriers. The storage of hydrogen in a liquid or compressed state, as well as in metal hydrides and adsorbents, depends on pressure and temperature and under normal conditions does not meet the criteria of the target hydrogen storage capacity, energy consumption for hydrogen storage or safety. The storage of hydrogen in chemical compounds in which it is naturally included in the composition is the only alternative. Aromatic hydrocarbons capable of reversible hydrogenation–dehydrogenation reactions are of the greatest interest among regenerable hydrogen-containing compounds and can be used for hydrogen storage. The role of the metal in the catalytic reactions of the hydrogenation–dehydrogenation of cyclic hydrocarbons for hydrogen storage is discussed in the present review in close relation to the structure and composition of the cyclic substrates.

Catalytic Hydrogenation of Anthracene on Binary (Bimetallic) Composite Catalysts

“…Table 2 describes that using the Fe-Co/ZSM-5, the degradation products consist mostly of 2-ethylbiphenyl, which is probably a source of phenanthrene formation. The probable mechanism of anthracene hydrogenation with obtained catalysts is as follows (Scheme 1): Table 3 compares values of anthracene conversions and yields of dihydroanthracene, tetrahydroanthracene and octahydroanthracene during anthracene hydrogenation with catalysts of platinum and rhodium added on Al2O3 [36] with the obtained values in this study. Table 3 compares values of anthracene conversions and yields of dihydroanthracene, tetrahydroanthracene and octahydroanthracene during anthracene hydrogenation with catalysts of platinum and rhodium added on Al 2 O 3 [36] with the obtained values in this study.…”

“…The probable mechanism of anthracene hydrogenation with obtained catalysts is as follows (Scheme 1): Table 3 compares values of anthracene conversions and yields of dihydroanthracene, tetrahydroanthracene and octahydroanthracene during anthracene hydrogenation with catalysts of platinum and rhodium added on Al2O3 [36] with the obtained values in this study. Table 3 compares values of anthracene conversions and yields of dihydroanthracene, tetrahydroanthracene and octahydroanthracene during anthracene hydrogenation with catalysts of platinum and rhodium added on Al 2 O 3 [36] with the obtained values in this study. Table 3 demonstrates that the catalysts obtained in this study are inferior to catalysts of platinum and rhodium in total anthracene conversion and octahydroanthracene yield.…”

“…Anthracene as other polyaromatic hydrocarbons is part of heavy organic raw materials, e.g., the petroleum products, coal tar and organic waste [31]. It is examined as a model compound to study various catalytic systems and to develop the processing methods of different organic raw materials [32][33][34][35][36][37][38][39][40][41][42][43].…”

Future of hydrogen economy: simulation-based comparison of LOHC systems

“…Since hydrogenation enthalpy is below 62.7 kJ/mol it is expected that the temperature for dehydrogenation can be decreased. This involves that condensed polycyclic compounds are advantageous since the heat of the reaction decreases with the higher number of aromatic rings (Kustov and Kalenchuk 2002). For example, the dehydrogenation temperature can be lowered by lowering the pressure or applying separation techniques within the reactor (or between catalyst beds) (Müller et al 2021).…”

Imcube: A static particle size analyzer for all shape types via advanced vision tools and integrated machinery

“…The observation of a high amount of cisdecalin showed that hexahydronaphthalene was hydrogenated to 9,10-octalin, not to 1,9octalin and then, it isomerized to 1,9-octalin which further be hydrogenated to cis-and trans-decalin. In addition, the adsorption of naphthalene occurred at one active metal, so naphthalene hydrogenation was structure-insensitive [8] but the adsorption of tetralin formed during the hydrogenation of naphthalene, as depicted in the mechanism by Rautanen et.al. (2002), needed an ensemble of atoms of the active metal and its hydrogenation was structure-sensitive.…”