Controlling the selectivity of high-surface-area Ru/TiO2 catalysts in CO2 reduction - modifying the reaction properties by Si doping of the support

Noble Metals in Recent Developments of Heterogeneous Catalysts for CO2 Conversion Processes

“…The authors demonstrated that CO 2 hydrogenation on Ru/TiO 2 catalyst mostly favors the formation of formate intermediates, which are CH 4 precursors. This aligns with several studies about CO 2 hydrogenation using Ru/TiO 2 catalysts [196–198] . On the other hand, encapsulation by the IPOP overlayer decreased the reactivity of the Ru/TiO 2 interface and introduced polymer/Ru interface sites, favoring the selectivity to *CO intermediates.…”

“…Considering good stability, with no deactivation after five reaction cycles in a batch reactor, Napromoted Ru/ZrO 2 has great potential for application in lowtemperature CO 2 methanation, but further studies in a continu-ChemCatChem ous flow packed-bed system could help to apply the material in tandem processes, like integrated capture and conversion units. Cisneros et al [66] provided an interesting alternative to improve the CH 4 selectivity of Ru/TiO 2 at higher temperatures by doping support with SiO 2 . The catalyst containing 8 wt.% SiO 2 led to almost ten times higher TOF values and 99 % CH 4 selectivity at 300 °C, while the unpromoted sample was only 16 %.…”

“…This aligns with several studies about CO 2 hydrogenation using Ru/TiO 2 catalysts. [196][197][198] On the other hand, encapsulation by the IPOP overlayer decreased the reactivity of the Ru/TiO 2 interface and introduced polymer/Ru interface sites, favoring the selectivity to *CO intermediates. Furthermore, IPOP overlayers significantly decreased *H coverage, promoting the CÀ C coupling reactions and increasing the C 2 + hydrocarbons production turnover frequency by 10-fold.…”

Structural Optimization of Reactor for the Enhancement of CO2 Electrochemical Reduction Based on Gas–Liquid Mixing Flow Model

“…[27][28][29][30] The second challenge lies in the subpar selectivity of electrochemical reduction reactions. [31][32][33] Since CO 2 reduction is a nonspontaneous reaction, the intermediate species required for the production of target products require high energy activation, while the competitive hydrogen evolution reaction requires low energy activation. This prevents the reaction toward the desired product and reduces the yield of the target product.…”

Tuning Selectivity of CO2 Hydrogenation via Support Composition Modification Adjusted the Activity Reduction of H Species over Ce1–xPrxO2−δ-Supported Metal (Ru, Rh) Nanoclusters

“…Doping is an effective strategy to regulate the structure of the support. ,− By doping other metallic elements into the support, the oxygen vacancy concentration and acid-alkalinity of the support could be changed, thus affecting the performance of various C1 conversion reactions. , For the CeO 2 support, the most common doping elements are Ti, Zr, and other rare-earth (RE) elements. Since Pr is close to Ce in the periodic table, doping of Pr has little effect on the lattice constant of CeO 2 .…”