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sustainable production of fuels and chemicals

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and increases energy demand, capital costs, and operation costs. In this regard, novel “water- free” approaches are needed, e.g. based on dimethyl ether and paraformaldehyde. Within a 5- year horizon, chain-length distribution of OME according to the Schulz–Flory estimate should be addressed, aiming to reduce separation of target products and recycling of co-products. Current results indicate that the equilibrium yield of OME3-5 could be overcome by insight-guided tailoring of pore structure and surface properties. On a 10-year horizon, replacing formaldehyde via direct CO/CO2 insertion into the growing OME chain should be addressed. 4.3.6 Higher alcohol synthesis Higher alcohols, including ethanol are used as fuel additives and platform chemicals. Catalysts explored for higher alcohols include Rh-based supported catalysts, metal sulfides or carbides, mod- ified FTS catalysts, and modified Cu-Zn based methanol synthesis catalysts [8]. The Rh-based catalysts (especially for ethanol) have been the state of the art, but significant challenges exist on a 5- and 10-year horizon. On the shorter timescale, selectivity and insufficiently fast rates are the key challenges, with methanol and light hydrocarbons being low-value byproducts. Also, the cost of Rh limits its wide-spread use and catalysts based on (combinations of) more abundant elements have to be discovered. The transition to less severe operating conditions (lower pressure and lower temperature) as mandated by decentralized processes represents the major challenge for the 10-year horizon. Such a radical transition will likely require insight into the molecular details of the process and the atomic details of the catalyst active sites. 4.3.7 Biochemical processes to convert syngas Biochemical processes to convert syngas into bulk energy carriers are relatively slow processes, albeit operating at much lower temperatures and pressures than the catalysts discussed above [9]. They possess advantages compared to metal catalysis due to their considerably higher tolerance against sulfur and nitrogen impurities and ability to be tailored for high selectivity. The first technical-scale syngas fermenters have been commercially deployed, receiving widespread acceptance, especially when combined with tandem process to produce jet fuel. Challenges on a 5- and 10-year horizon include the limited productivity due to the low solubility of the syngas in aqueous environments and the associated gas transfer limitations. As wild-type strains of the most popular acetogenic bacteria only produce acetate, ethanol, and some 2,3-butanediol (only a few strains also produce minor amounts of butyrate, butanol, caproate, and hexanol), engineering of the bacteria to produce specific chemicals is a key target. Likewise, catalytic tandem processes accessing not only ethanol but also its more oxidized forms, such as acetic acid, and easier separation of the aqueous phase product mixture are important targets. 45

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