CO Capture with Polyethylenimine Supported on 3D-Printed Porous SiO Structures.

Amines supported on porous solid materials have a high CO adsorption capacity and low regeneration temperature. However, the high amine load on such substrates and the substrate itself may lead to substantial pressure drop across the reactor. Herein, we compare the CO adsorption capacity and pressure drop of fumed silica powder to 3D-printed monolithic fumed silica structures, both functionalized by polyethylenimine (PEI), and find a drastically reduced pressure drop for 3D-printed substrates (0.

Review on CO Capture Using Amine-Functionalized Materials.

CO capture from industry sectors or directly from the atmosphere is drawing much attention on a global scale because of the drastic changes in the climate and ecosystem which pose a potential threat to human health and life on Earth. In the past decades, CO capture technology relied on classical liquid amine scrubbing. Due to its high energy consumption and corrosive property, CO capture using solid materials has recently come under the spotlight.

Adsorption behavior of salicylic, benzoic, and 2-methyl-2-hexenoic acid on alumina: an in situ modulation excitation PM-IRRAS study.

Adsorption and desorption of acid molecules (10(-4) M in cyclohexane) with different functional groups, namely salicylic acid (SA), benzoic acid (BA) and 2-methyl-2-hexenoic acid (MHA), on an Al(2)O(3) thin film was studied by in situ polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS). We used a flow-through PM-IRRAS cell to induce adsorption and desorption processes by alternating acid concentration. Simultaneous but separate detection of liquid-phase and surface species was achieved in a time-resolved manner by PM-IRRAS providing insight into the adsorption-desorption behavior and their kinetics.

Design and performance of a flow-through polarization-modulation infrared reflection-absorption spectroscopy cell for time-resolved simultaneous surface and liquid phase detection under concentration and temperature perturbations.

Design and performance of a flow-through cell for polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) suitable for simultaneous monitoring of species on surface and in liquid phase on a molecular level at a high time resolution (ca. 1 s) are presented. In particular, the cell was designed to allow periodic concentration and temperature perturbations and thus excite physicochemical phenomena of interest occurring at solid-liquid interfaces.

Polarization-modulation infrared reflection-absorption spectroscopy affording time-resolved simultaneous detection of surface and liquid phase species at catalytic solid-liquid interfaces.

Polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) combined with concentration modulation allows simultaneous monitoring of dynamic evolutions of surface and liquid phase species during reactions at catalytic interfaces as demonstrated for the Pt-catalysed oxidation of CO by O2 in cyclohexane.

Conformational behavior of cinchonidine revisited: a combined theoretical and experimental study.

Conformational space of cinchonidine has been explored by means of ab initio potential and free energy surfaces, and the temperature-induced changes of conformational populations were studied by a combined NOESY-DFT analysis. The DFT-derived potential energy surface investigation identified four new conformers. Among them, Closed(7) is substantially relevant to fully understand the conformational behavior.

Hydrogen-bonding interactions in cinchonidine-2-methyl-2-hexenoic acid complexes: a combined spectroscopic and theoretical study.

Molecular interactions between cinchonidine (CD) and 2-methyl-2-hexenoic acid (MHA) have been studied by means of NMR, ATR-IR MES, DFT, and ab initio molecular dynamics. These interactions are of particular interest due to their pivotal role in the chiral induction occurring in the heterogeneous catalytic asymmetric hydrogenation of alpha,beta-unsaturated acids. The population density of the Open(3) conformer of CD, the most populated one at room temperature in apolar solvents, considerably increased to a maximum by addition of MHA to CD in toluene.