Abstract
In the recent era, hydrogen has gained immense consideration as a clean-energy carrier. Its storage is, however, still the main hurdle in the implementation of a hydrogen-based clean economy. Liquid organic hydrogen carriers (LOHCs) are a potential option for hydrogen storage in ambient conditions, and can contribute to the clean-fuel concept in the future. In the present work, a parametric and simulation study was carried out for the storage and release of hydrogen for the methylcyclohexane toluene system. In particular, the methylcyclohexane dehydrogenation reaction is investigated over six potential catalysts for the temperature range of 300–450 °C and a pressure range of 1–3 bar to select the best catalyst under optimum operating conditions. Moreover, the effects of hydrogen addition in the feed mixture, and byproduct yield, are also studied as functions of operating conditions. The best catalyst selected for the process is 1 wt. % Pt/γ-Al2O3. The optimum operating conditions selected for the dehydrogenation process are 360 °C and 1.8 bar. Hydrogen addition in the feed reduces the percentage of methylcyclohexane conversion but is required to enhance the catalyst’s stability. Aspen HYSYS v. 9.0 (AspenTech, Lahore, Pakistan) has been used to carry out the simulation study.
Highlights
Conventional fuel-based power generation systems are the major contributors to air pollution in the modern era
The methylcyclohexane (MCH-4)toistoluene fed to the reactor (DeH-Reactor), where methylcyclohexane dehydrogenation anddehydrogenation hydrogen is carried out using a suitable catalyst
The operating parameters are concurrently altered to determine the percentage of methylcyclohexane (MCH) conversion for all the six catalysts used in the parametric study
Summary
Conventional fuel-based power generation systems are the major contributors to air pollution in the modern era. For the storage of hydrogen through NH3 , MCH and Liquid H2 , existing infrastructure along with established rules and regulations are developed. Usman et al studied MCH dehydrogenation using a catalytic fixed-bed reactor to determine the selectivity and activity of the various catalysts. The performance of the dehydrogenation system is mainly dependent on temperature and pressure conditions, and the percentage of conversion changes with changes in operational conditions and use of suitable catalysts [22,26,27]. The present study intends to address this research gap by investigating methylcyclohexane dehydrogenation for the hydrogen release and storage, based on a simulation–parametric study. The six catalysts are investigated for the dehydrogenation system to select the best catalyst for the process, under the optimum operational conditions, i.e., temperature, pressure, and hydrogen concentration at the reactor inlet. Aspen HYSYS v. 9.0 has been used to carry out the simulation study
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
