Thermocatalytic CO₂conversion by siliceous matter: a review

Abstract

Solid siliceous (silica/silicate) materials remain a handy tool in assisting the defossilization efforts under the aegis of carbon capture and utilization (CCU) for extracting chemicals from “air” rather than “ground”....

Three-Dimensional Assemblages of Metal Silicate for Catalytic CO2 Conversion to Methanol and Adsorptive Pollutant Removal

“…This leads to our conjecture that the rate-limiting step is more likely further toward the final few steps, rather than the initial first elementary steps, as it takes some time for the methanol species to be saturated on the catalyst surface. If the rate-limiting step is at the beginning of the reaction chain, then it would be more likely to observe a similar degree of increment of peak intensity across for all detected chemical species including the product species (i.e., methanol in this experiment) . At 280 °C (Figure S14), all peaks appear to be similar regardless of time intervals, which might indicate that the intermediate and product chemical species are quickly saturated on the catalyst surface at higher temperatures, without any meaningful time-resolved trends to be interpreted, except that the DRIFTS results become stable at higher temperatures more quickly than at lower temperatures.…”

Hollow carbon-based materials for electrocatalytic and thermocatalytic CO2 conversion

“…Methane synthesis from CO 2 hydrogenation (CO 2 + 4H 2 / CH 4 + 2H 2 O, DH°= −165 kJ mol −1 ), known as the Sabatier reaction, is an exothermic process that is more thermodynamically favorable than many other hydrogenation routes. 21,171 However, it still suffers from signicant kinetic limitations due to the intrinsical inertness of linear CO 2 and the involvement of an eight-electron transfer process. 165,172,173 Several metal-containing catalysts have been demonstrated as effective candidates for this reaction, typically based on Ru, Rh, Pd, and Ni NPs on supported materials, with Ni-based catalysts being the most popular one because of the low cost and rich reserves.…”

“…19,20 Thermocatalytic CO 2 conversion, mainly including CO 2 hydrogenation and CO 2 dry reforming of methane (DRM), is a feasible process to alleviate the large CO 2 emissions from the viewpoint of cost-efficiency. 21 Among them, DRM is a highly endothermic reaction with the equation CH 4 + CO 2 / 2CO + 2H 2 , DH°= 247 kJ mol −1 . 22 The large energy consumption and the deactivation of catalysts caused by active metal sintering or coke deposition during the DRM process seriously hindered its applicability.…”

CO2 to dimethyl ether (DME): structural and functional insights of hybrid catalysts

“…reduction of CO 2 . [18][19][20][21] Out of them, the thermochemical approach has gained remarkable recognition owing to its fast kinetics and tunable combination of active sites. 22 Currently, the conversion of CO 2 to useful chemicals is not only limited through the production of urea, salicylic acid, and carbonates on the industrial scale rather extended up to more industrially important hydrogenated C 1 products like formic acid (HCOOH), carbon monoxide (CO), methane (CH 4 ), and methanol (CH 3 OH).…”