Anastasiya Agapova, Henrik Junge, Matthias Beller
Here we present the renewable energy project “Metha-Cycle”. The aim of this project is the technological development of energy and hydrogen storage in methanol. This technology also enables the carbon dioxide based chemical storage of renewable energies as well as a decentralized supply of energy and hydrogen.
Statement of the Problem: The concept of “hydrogen economy” in the renewable energy field is an attractive developing topic, since hydrogen is being viewed as environmentally benign energy carrier. Storage of hydrogen is a challenge, because its liquefaction is rather costly and has its challenges. That is why the chemical storage of hydrogen in liquid organic compounds and its release on demand is currently in focus. Presently there are many systems under investigation (formic acid, methanol, LOHC). Methanol, having high gravimetric and volumetric hydrogen content under ambient conditions and long term stability, is viewed as very promising for this purpose.
The present endeavors to substitute fossil energy transporters by environmentally friendly power sources experience the ill effects of vacillations of wind and daylight for which there is an absence of fitting energy stockpiling advances, specifically for power. A promising technique toward this path is substance energy stockpiling, as the energy thickness of the compound bond is unmatched. As of now, there are primarily two choices being talked about: power-to-gas (PtG) creating methane (engineered flammable gas, SNG) and capacity to-fluid, which stores electric force as methanol. In any case, the upsides and downsides of either innovation are normally examined without with respect to the cycle economy and the general efficiencies, and the material utilization of the objective mixes has likewise been ignored. Point by point investigations of operational encounters from existing methane and methanol plants via AirLiquide (previously Lurgi) uncovered critical contrasts between the two methodologies, among which methanol has arisen to have the best by and large proficiency (44.9 %). Furthermore, methanol has the extra preferred position of being an all-inclusive compound and fuel feedstock, consequently addressing the ideal possibility for synthetic energy stockpiling, yet in addition for subbing fossil crude materials.
Methodology & Theoretical Orientation: The aim of the project is the technological development of energy and hydrogen storage in methanol via CO2 neutral cycle. The aim of the LIKAT sub-project is the development of suitable catalysts for hydrogen production. The obtained data and catalysts should serve as the basis for operation of a miniplant in FAU Erlangen-Nurnberg. The aim of ZBT Duisburg subproject is the development of a polymer electrolyte (PEM) fuel cell system for the efficient conversion of H2 produced from MeOH while simultaneously providing the reaction enthalpy necessary for the catalytic splitting of methanol. A second focus of the LIKAT subproject is the development of catalysts for low-temperature methanol production by direct hydrogenation of CO2. The aim of HOST subproject is a modular simulation of the entire system of methanol production and reconversion by wind and solar power. The present interdisciplinary project enables indirect storage of wind energy in the form of methanol, and further methanol conversion into electrical energy via low-temperature hydrogen release in a fuel cell.
Findings: For LIKAT subproject we report an improved bi-catalytic system for methanol dehydrogenation, using two ruthenium-based PNP pincer complexes at mild conditions (TON > 17000). The proposed system exhibits synergistic activity under significantly reduced base amount. For low scale reaction at least 120 h of continuous hydrogen generation is achieved with good product selectivity.
Published Date: 2021-01-28;