<span style="font-size:13.0pt;mso-bidi-font-weight:bold">Ru catalyzed formylation of diethylamine with CO₂ and H₂ under moderate pressure condition </span>

752-756Ru catalyzed formylation of diethylamine (bulky secondary amine) with CO2 and H2 has been investigated using a series of phosphine ligands. Significant influence on the catalyst activity and selectivity is observed with bidentate phosphine ligands. The Ru catalyst with the ligand, 1,2-bis(diphenylphosphino)benzene exhibits the highest catalyst performance (TON up to 2475). The high conversion (99%) and high selectivity to the corresponding formamide (up to 90-98%) is achieved at 150 °C and moderate pressure conditions. The effects of temperature, concentration of diethylamine and partial pressure of CO2 and H2 on the formylation of diethyl amine catalyzed have been examined in order to improve the catalytic activity and selectivity.</span

Monodentate bulky trinaphthylphosphine as ligand in Rh, Co and Ru catalyzed hydroformylation of 1-hexene

27-32Rhodium, cobalt, and ruthenium complexes of monodentate bulky trinaphthylphosphine ligand, PNp3, have been synthesized and used as catalysts for the hydroformylation of 1-hexene. The catalyst, RhCl(PNp3)3 shows excellent hydroformylation activity as compared to the Co/PNp3 and Ru/PNp3 system. The high conversion (99 %) with high selectivity to aldehydes (97 %) is achieved by RhCl(PNp3)3 catalyst whereas RuCl2(PNp3)3 is more active toward hydrogenation rather than hydroformylation

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

CO2 adsorbents comprising various alkaline sorption active phases supported on mesoporous Al2O3 were prepared. The materials were tested regarding their CO2 adsorption behavior in the mid-temperature range, i.e., around 300 °C, as well as characterized via XRD, N2 physisorption, CO2-TPD and TEM. It was found that the Na2O sorption active phase supported on Al2O3 (originated following NaNO3 impregnation) led to the highest CO2 adsorption capacity due to the presence of CO2-philic interfacial Al–O––Na+ sites, and the optimum active phase load was shown to be 12 wt % (0.22 Na/Al molar ratio). Additional adsorbents were prepared by dispersing Na2O over different metal oxide supports (ZrO2, TiO2, CeO2 and SiO2), showing an inferior performance than that of Na2O/Al2O3. The kinetics and thermodynamics of CO2 adsorption were also investigated at various temperatures, showing that CO2 adsorption over the best-performing Na2O/Al2O3 material is exothermic and follows the Avrami model, while tests under varying CO2 partial pressures revealed that the Langmuir isotherm best fits the adsorption data. Lastly, Na2O/Al2O3 was tested under multiple CO2 adsorption–desorption cycles at 300 and 500 °C, respectively. The material was found to maintain its CO2 adsorption capacity with no detrimental effects on its nanostructure, porosity and surface basic sites, thereby rendering it suitable as a reversible CO2 chemisorbent or as a support for the preparation of dual-function materials

Enhancing CO2 methanation over Ni catalysts supported on sol-gel derived Pr2O3-CeO2: An experimental and theoretical investigation

Ni-based catalysts supported on sol-gel prepared Pr-doped CeO2 with varied porosity and nanostructure were tested for the CO2 methanation reaction. It was found that the use of ethylene glycol in the absence of H2O during a modified Pechini synthesis led to a metal oxide support with larger pore size and volume, which was conducive toward the deposition of medium-sized Ni nanoparticles confined into the nanoporous structure. The high Ni dispersion and availability of surface defects and basic sites acted to greatly improve the catalyst's activity. CFD simulations were used to theoretically predict the catalytic performance given the reactor geometry, whereas COMSOL and ASPEN software were employed to design the models. Both modelling approaches (CFD and process simulation) showed a good validation with the experimental results and therefore confirm their ability for applications related to the prediction of the CO2 methanation behaviour

Enhancing CO2 methanation over Ni catalysts supported on sol-gel derived Pr2O3-CeO2: An experimental and theoretical investigation

Ni-based catalysts supported on sol-gel prepared Pr-doped CeO2 with varied porosity and nanostructure were tested for the CO2 methanation reaction. It was found that the use of ethylene glycol in the absence of H2O during a modified Pechini synthesis led to a metal oxide support with larger pore size and volume, which was conducive toward the deposition of medium-sized Ni nanoparticles confined into the nanoporous structure. The high Ni dispersion and availability of surface defects and basic sites acted to greatly improve the catalyst's activity. CFD simulations were used to theoretically predict the catalytic performance given the reactor geometry, whereas COMSOL and ASPEN software were employed to design the models. Both modelling approaches (CFD and process simulation) showed a good validation with the experimental results and therefore confirm their ability for applications related to the prediction of the CO2 methanation behaviour