Efficient Promoters and Reaction Paths in the CO₂ Hydrogenation to Light Olefins over Zirconia-Supported Iron Catalysts

Abstract

Hydrogenation into light olefins is an attractive strategy for CO 2 fixation into chemicals. In this article, high throughput experimentation and extended characterization were employed to identify the most efficient promoters and to elucidate structure−performance correlations and reaction paths in the CO 2 hydrogenation to light olefins over zirconia-supported iron catalysts. K,

Light olefin synthesis from a diversity of renewable and fossil feedstocks: state-of the-art and outlook

“…Then, the adsorbed C 1 monomers transform similar to those in FT synthesis with syngas. Our recent results suggest 338 that the rates of hydrogenation of adsorbed C 2 -C 4 species and rates of oligomerization could be different over the catalysts with and without alkaline promoters. Over the catalysts containing alkaline metals, the oligomerization to the C 5+ hydrocarbons limits the LO selectivity, while the contribution of hydrogenation of adsorbed C 2 -C 4 species or secondary hydrogenation of LOs to paraffins is not significant.…”

Strengthening the Connection between Science, Society and Environment to Develop Future French and European Bioeconomies: Cutting-Edge Research of VAALBIO Team at UCCS

“…In this context, the research projects developed in the VAALBIO group at UCCS encompass several key directions: biomass fractionation, cellulose [119,120] and hemicellulose valorization [121], green hydrogen production and CO 2 valorization [122][123][124][125][126][127], and more recently, multicatalytic materials [128] and lignin valorization. As shown above, our research projects concern mainly the synthesis of important chemical synthons using heterogeneous and chemo-enzymatic processes.…”

Chemical State of Potassium on the Surface of Iron Oxides: Effects of Potassium Precursor Concentration and Calcination Temperature

“…On the other hand, the changing composition of potassium may also affect active sites on the catalyst and, thereby, the catalytic performance [ 29 , 30 , 31 ]. An iron-based catalyst was synthesized using a potassium nitrate precursor with varying potassium loading and a calcination temperature of 400 or 500 °C to study the CO 2 hydrogenation reaction [ 32 , 33 , 34 ]. The effect of potassium loading for the selective catalytic reduction of NO x with an iron-based catalyst has been investigated [ 35 ].…”

“…Overall, evaluating the influence of the promoter effects (e.g., metal salts [ 37 ]) in the environment of iron oxides can be a challenging experimental task, due to the large number of variables that need to be controlled during the synthesis (e.g., temperature, pressure, amount of promoter precursor, etc.). Simultaneously, there is a need to characterize low levels of the promoter and its structural and electronic properties [ 34 , 37 , 38 , 39 ]. Even small changes in the iron oxide phase, composition, and morphology (e.g., by the addition of structural (Al 2 O 3 ) or electronic (K 2 O) promoters [ 34 , 38 , 39 ]) can affect the catalysts’ performance and the mechanism of catalysis for important processes such as the synthesis of ammonia and the Fisher–Tropsch process [ 38 , 39 ].…”

“…Simultaneously, there is a need to characterize low levels of the promoter and its structural and electronic properties [ 34 , 37 , 38 , 39 ]. Even small changes in the iron oxide phase, composition, and morphology (e.g., by the addition of structural (Al 2 O 3 ) or electronic (K 2 O) promoters [ 34 , 38 , 39 ]) can affect the catalysts’ performance and the mechanism of catalysis for important processes such as the synthesis of ammonia and the Fisher–Tropsch process [ 38 , 39 ]. Therefore, to reach a better understanding of the catalytic performance and catalysis mechanism of potassium (promoter)-based iron oxide catalysts, it is important to know in detail the electronic state and structural parameters of both the promoter and catalyst reported in this work.…”