Production of Higher Hydrocarbons from CO₂ over Nanosized Iron Catalysts

Abstract

The effects of the particle size of a Fe/Cu/K catalyst on CO and CO 2 hydrogenation reactions as well as the variation of crucial factors such as surface area and basicity, reduction, carburization, and catalytic behavior of precipitated Fe/Cu/K catalysts were evaluated. Hematite nanoparticle catalysts with various surface tensions were produced by homogeneous precipitation in alcohol/water solvents. The basicity of the K-promoted iron catalyst was higher in iron catalysts with lower particle size. The increase in K-basic sites at the surface of catalysts with smaller particle size was attributed to their higher surface areas. Elevation of catalyst basicity led to considerably stronger dissociative CO adsorption. Shifting the oxygen removal pattern to lower temperature was the consequence of faster nucleation of FeCx crystallites on promoted surface oxides. CO 2 hydrogenation can occur in two distinct direct and indirect routes via the Fischer-Tropsch mechanism.

Dry reforming of methane by La0.5Sr0.5NiO3 perovskite oxides: influence of preparation method on performance and structural features of the catalysts

“…The tendency for C deposition on the surface of the consumed catalysts is as follows: La 0.5 Sr 0.5 NiO 3 treated > La 0.5 Sr 0.5 NiO 3 nontreated > LaNiO 3 nontreated > LaNiO 3 treated ( Table 2). The higher basicity of the Sr-substituted catalysts led to an increase in CO 2 adsorption, and therefore, greater C deposition [Eqn (6)].…”

“…[1][2][3][4] Syngas contains hydrogen (H 2 ) and carbon monoxide (CO), important intermediate resources for producing hydrogen, methanol, ammonia and hydrocarbon fuels. [5][6][7][8][9][10] The DRM process also consumes the undesirable greenhouse gases carbon dioxide (CO 2 ) and methane (CH 4 ). [11][12][13] Studies have confirmed that the noble metal-based catalysts can be applied to enhance the efficiency of the DRM reaction.…”

Direct Coal Liquefaction Using Iron Carbonyl Powder Catalyst

“…Coal liquefaction refers to the conversion of coal solids to organic liquid products. This process can be subdivided into direct coal liquefaction and indirect coal liquefaction . During direct coal liquefaction, coal is broken down and hydrogenated at elevated temperatures and pressures to directly produce liquid products .…”