Directly converting carbon dioxide to linear α-olefins on bio-promoted catalysts

Abstract

Although considerable efforts have been made in converting carbon dioxide to hydrocarbons via hydrogenation processes, precise control of CC coupling towards heavy olefins remains a challenge. Here we report a carbon dioxide hydrogenation to olefin process that achieves 72% selectivity for alkenes and 50.3% selectivity for C 4-18 alkenes, of which formation of linear α-olefins accounts for 80%. The process is catalyzed by carbon-supported iron, commonly used in CC coupling reactions, with multiple alkali promoters extracted from corncob. The design is based on the synergistic catalysis of mineral elements in biomass enzyme on which carbon dioxide can be directly converted into carbohydrate. The mineral elements from corncob may promote the surface enrichment of potassium, suppressing the secondary hydrogenation of alkenes on active sites. Furthermore, carburization of iron species is enhanced to form more Fe 5 C 2 species, promoting both the reverse water-gas shift reaction and subsequent CC coupling.

Tandem Conversion of CO2 to Valuable Hydrocarbons in Highly Concentrated Potassium Iron Catalysts

“…In addition, the production of light olefins (C 2 −C 4 ), expressed as iron based space‐time yield (STY; mmol of light olefins produced per gram of Fe per hour) reported here is twice than the ones achieved by FTS catalysts. Furthermore, the Fe 2 O 3 @K 2 CO 3 catalyst here reported also outperforms conventional CO 2 hydrogenation materials, yielding the highest productivity of light olefins per gram of catalyst (see Table S1).…”

A Critical Look at Direct Catalytic Hydrogenation of Carbon Dioxide to Olefins

“…To enhancecatalysis,webelieve that the following four aspects should be focused upon: 1) Increase the C/H ratio on the catalyst surface if following the MFTS route. [20] This effect leads to ap otassium-enriched surfacet hat could promote the formation of carbides and suppress alkene hydrogenation;thus resulting in ahighera mount of olefins. Second, once olefinsa re formed, readsorption and furtherr eactionl ead to the formation of side products, such as alkanes, through hydrogenation.…”

“…[19,20] Lower olefins (C 2 = -C 4 = ), generally referring to ethylene, propylene, butylene, and 1,3-butadiene, are important chemicals because they are the building blocks of plastics, synthetic textiles, rubbers, solvents, and coatings. in chemistry magna cum laude from the Hebrew University of Jerusalem.…”

Beyond Cars: Fischer‐Tropsch Synthesis for Non‐Automotive Applications

“…The 1‐olefins are a series of important hydrocarbons with an unsaturated C=C bond at the starting position of carbon chain . Employing 1‐olefins as additional inducer for F‐T synthesis is possible as they are easy to initiate new carbon chain propagation, leading to new F‐T hydrocarbon distribution against the classic ASF law.…”