sustainable production of fuels and chemicals

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difficulties for conversion, selectivity, and stability, and will likely require the development of new catalysts. Additionally, while the forward shift is widely applied in industry for cleaning the gas stream from CO, there is no industrial process available for the RWGS. To increase the CO yield, the reaction’s endothermicity suggests higher temperatures should be employed. However, at such temperatures, catalyst stability and suppression of methanation constitute major catalyst develop- ment challenges. The so-called CAMERE process in South Korea is an example of a combination of RWGS, water removal and conventional methanol synthesis leading to the net conversion of CO2 to methanol and demonstrating the general technological feasibility of the process [13], but further research and development is required to reach an economic system. New room for optimization may be found in an alternative two-step route consisting of RWGS followed by water removal and methanol synthesis from pure CO/H2. This is as opposed to industrial methanol synthesis, in which the feed also contains CO2. An anhydrous CO to methanol synthesis reaction would be free of the kinetic limitations imposed by site-blocking water species and thermodynamically more favorable (CO + 2H2 → CH3OH, ∆Ho= -91 kJ/mol), which would enable milder conditions. This scenario necessitates further research into the development of catalysts for CO hydrogenation to methanol with optimized activity and stability. CO2 can also be reduced by methane to produce syngas via dry reforming (CO2 + CH4 → 2 CO + 2H2). This reaction is of special interest when considering production of fuels from biogas. In this context, the impact of biogas composition and purity must also be considered due to possible catalyst poisoning. Another major challenge in dry reforming is the need for abundant catalysts resistant to deactivation by carbon deposits [14]. Operating the dry reforming process under unsteady conditions in a chemical looping mode has shown promise for further breakthroughs in this area [15]. 3.2.3 CO2 -to-CH4 Power-to-Gas is an energy storage technology that consists of the conversion of CO2 to methane via renewable hydrogen (CO2 + 4H2 → CH4 + 2H2O, ∆Ho= -165 kJ/mol). It constitutes a promising solution for long-term and large-scale energy storage thanks to the readily available natural gas grid, a more than 2 million km transmission and distribution network that includes nearly 800 TWh of underground storage across Europe. CO2 methanation is operated at about 300-600 ◦C and moderate pressure. Usually catalyzed by nickel-based supported catalysts, CO2 methanation has already matured beyond lab-scale. Currently operational demonstration projects based in Europe will provide a basis for the design and economics of full-scale units by yielding information on system flexibility and operation constraints, reactor performance, and long-term catalyst behaviour [16]. Remaining areas for research include addressing robustness against intermittent operation [17] and unsteady state operation [18], and exploring milli- and micro-reactors, sorption enhancement, 31

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