Carbon dioxide adsorption from a simulated flue gas stream was successfully performed with hyperbranched aminosilica (HAS) material. The HAS synthesized by one-step reaction, spontaneous aziridine ring-opening polymerization off of surface silanols, to form 32 wt % organic/inorganic hybrid measurements were in fixed-bed flow reactor using humidified CO2. advantage this adsorbent over previously reported adsorbents is the stability organic groups covalently bound silica support compared those...

Abstract Hyperbranched aminosilica (HAS) adsorbents are prepared via the ring‐opening polymerization of aziridine in presence mesoporous silica SBA‐15 support. The aminopolymers covalently bound to support and capture CO 2 reversibly a temperature swing process. Here, range HAS materials with different organic loadings. effects loading on structural properties adsorption resultant hybrid examined. residual porosity after loading, as well molecular weights degrees branching for separated...

Solid amine sorbents were prepared using mixtures of linear and branched primary, secondary, tertiary amines. These amines immobilized within polystyrene (PS)-, silicon dioxide (SiO2)-, or polymethylmethacrylate (PMMA)-based substrates at various weight ratios. Testing was conducted in reactor systems, where the reactive water required for capture carbon (CO2) tracked during adsorption/desorption cycles by mass spectrometer gas analysis. The management these quantified used to assess...

Thermogravimetric analysis is used to study the adsorption kinetics, equilibrium, and thermodynamics of CO 2 on immobilized polyethylenimine sorbent impregnated a mesoporous silica over range 300–390 K 5–100% concentration. Adsorption isotherm models were fitted experimental data indicating that change in mechanism occurred near 70 ° C. Below this temperature, followed heterogeneous isotherms, while taken at higher‐temperatures isotherms for homogeneous surfaces. Heat sorption was estimated...

Prospective post-combustion CO2 capture sorbents were prepared by the immobilization of a low-molecular-weight, branched polyethyleneimine (PEI) and 3-(aminopropyl)triethoxysilane (APTES) within commercially available porous PQ Corporation CS-2129 silica support to investigate (i) adsorption properties supported mixed-amine (PEI+APTES) in both pure environments simulated flue gas conditions, (ii) their thermal hydrolytic stability over numerous desorption cycles, (iii) equilibrium kinetic...

An amine sorbent, prepared by impregnation of polyethyleneimine on silica, was tested for steam stability. The stability the sorbent investigated in a fixed bed reactor using multiple cycles 90 vol % H2O/He at 105 °C, and gas effluent monitored with mass spectrometer. CO2 uptake found to decrease repeated exposure steam. Characterization spent N2 physisorption, SEM, thermogravimetric analysis (TGA) showed that loading can possibly be attributed reagglomeration pores silica. No support effect...

The uptake of CO2 in highly loaded, silica-supported, polyethylenimine (PEI)-impregnated sorbents was investigated a reaction-diffusion model the adsorption process. successfully replicated pseudoequilibrium behavior experimentally observed thermogravimetry (TGA) experiments. A parametric study and sensitivity analysis revealed that stability mobility diffusive intermediates—assumed to be zwitterions—effectively control observable capacity sorbent. subsequent quantum chemical called into...

Nano-layered sorbents for CO2 capture, the first time, were developed using layer-by-layer nanoassembly. A CO2-adsorbing polymer and a strong polyelectrolyte alternately immobilized within porous particles. The had fast adsorption desorption properties their capture capacity increased with increasing nano-layers of polymer.

A study of carbon concentrates separated by a number different commercial and laboratory methods from various coal-combustion fly ashes was undertaken to determine what common unique chemical physical properties can be expected in such concentrates. The were determined using variety spectroscopic characterization then compared among the two cases with unprocessed ashes. class F originated total seven utilities burning bituminous coals underwent one six processing produce concentrates, which...

A statistical methodology was applied to the simultaneous calibration and validation of thermodynamic models for uptake CO2 in mesoporous silica-supported amines. The is Bayesian, follows procedure introduced by Kennedy O'Hagan. One key aspect application presented use quantum chemical calculations define prior probability distributions physical model parameters. Inclusion this information proved be crucial identifiability parameters against experimental thermogravimetric data. Through...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of phase-transfer reaction conditions for the hydrogenation conjugated dienes and .alpha.,.beta.-unsaturated ketones with a homogeneous metal hydride catalystDaniel L. Reger, M. Habib, D. J. FauthCite this: Org. Chem. 1980, 45, 19, 3860–3865Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue 1 September...

Thermogravimetric analysis was employed to investigate the CO2 and H2O adsorption rates water vapor equilibrium on anhydrous prehydrate linear polyethylenimine (LPEI) sorbent impregnated within a commercially functional CARiACT G10 (HPV) silica support. Water experiments utilizing specific humidities of 2%, 8%, 16% in contact with an PEI resulted proportional quantities uptake. Subsequently, both prehydrated PEI-impregnated sorbents were made available identical humidified gaseous streams...