Abstract
The hydrogen economy is expected to dominate in the nearest future. Therefore, the most hydrogen-containing compounds are considered as potential pure hydrogen sources in order to achieve climate neutrality. On the other hand, alkanes are widely used to produce industrially important monomers via various routes, including dehydrogenation processes. Hydrogen is being produced as a by-product of these processes, so the application of efficient separation of hydrogen from the reaction mixture can give double benefits. Implementation of the dehydrogenation processes in the catalytic membrane reactor is that case. Since the use of dense metal membranes, which possess the highest perm-selectivity towards hydrogen, is complicated in practice, the present research is aimed at the optimization of the porous membrane characteristics. By means of a mathematical modeling approach, the effects of pore diameter on the hydrogen productivity and purity for the cases of ethane and propane dehydrogenation processes were analyzed. The pore size value of 0.45 nm was found to be crucial as far as the diffusion of both the alkane and alkene molecules through the membrane takes place.
Highlights
During the last decade, hydrogen has become the most attractive energy source playing a key role in multi-sectorial decarbonization processes [1,2,3,4]
Since the use of dense metal membranes, which possess the highest perm-selectivity towards hydrogen, is complicated in practice, the present research is aimed at the optimization of the porous membrane characteristics
The alkane dehydrogenation processes can be, considered as an alternative for the existing hydrogen production methods, including steam reforming of methane and natural gas [16,17]
Summary
Hydrogen has become the most attractive energy source playing a key role in multi-sectorial decarbonization processes [1,2,3,4]. Allows the elimination of produced hydrogen from the reaction zone through the permselective membrane along with an increase in conversion of the hydrocarbon substrate In this case, the hydrogen-containing and alkene-containing gaseous flows are spatially separated. The hydrogen-containing and alkene-containing gaseous flows are spatially separated Another advantage of using the CMR is that due to a shift of thermodynamic. Hydrogen 2021, 2 gaseous flows are spatially separated Another advantage of using the CMR is that due to a shift of thermodynamic equilibrium, the dehydrogenation process can be realized at lower temperatures. General, a large number of research research works reported literature deal withInboth dense metal membranes and works reported in the with both dense metal membranes memporous membranes ofliterature different deal nature [18,19,20] Among these materials, the dense metal membranes membranes are characterized with the highest perm-selectivity towards hydrogen. Hydrogen production via the catalytic dehydrogenation of alkanes is elucidated
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