A5047255694- Membrane Separation and Gas Transport
- Carbon Dioxide Capture Technologies
- Catalysis and Hydrodesulfurization Studies
- Zeolite Catalysis and Synthesis
- Covalent Organic Framework Applications
- Adsorption and Cooling Systems
- Carbon dioxide utilization in catalysis
- Chemical Synthesis and Characterization
- Algal biology and biofuel production
- Catalysis for Biomass Conversion
- biodegradable polymer synthesis and properties
- Catalytic Processes in Materials Science
- Catalytic C–H Functionalization Methods
- Asymmetric Hydrogenation and Catalysis
- Nanomaterials for catalytic reactions
- Maritime Transport Emissions and Efficiency
- Biodiesel Production and Applications
- Catalytic Cross-Coupling Reactions
- Metal-Organic Frameworks: Synthesis and Applications
- Phase Equilibria and Thermodynamics
- Polyoxometalates: Synthesis and Applications
- Catalysis and Oxidation Reactions
Global Thermostat (United States)
2019-2023
Georgia Institute of Technology
2010-2013
University of Colorado Boulder
2012-2013
A single-component, recyclable heterogeneous palladium nanoparticle catalyst is described for the selective hydrogenation of alkynes. The nanoparticles are generated through reduction Pd(II) species loaded into a mesoporous silica material functionalized with branched poly(ethyleneimine) polymers. An array composite catalysts similar polymer composition, loading, and size (∼2 nm) prepared to understand importance attachment method, metal molecular weight, oxide porosity. Each shows excellent...
Poly(ethyleneimine)-impregnated sorbents are prepared using a hierarchical silica support with bimodal meso-/macroporosity. The behave unexpectedly during CO2 adsorption from simulated air and flue gases (400 ppm 10% CO2) at fixed temperature, as compared to systems built on commonly studied mesoporous materials. results demonstrate that (i) impregnation methods influence the efficacy of sorption performance (ii) show almost similar uptake capacities under 400 dry 30 °C, exhibiting step-like...
Physical aging or degradation of amine-containing polymers and supported amine adsorbents is a critical issue that could limit the practical application such materials for CO2 capture. However, to date, there scarcity studies evaluate long-term stability amine-based sorbents without exclusive use accelerated tests. Here, we demonstrate extended (∼2 years) linear poly(propylenimine) (LPPI) confined in mesoporous silica (SBA-15) supports does not drastically impact adsorption performance under...
Solid-supported amine-based polymers are known to be effective for CO2 capture from dilute streams, including flue gas and ambient air. In this work, we report the synthesis of well-defined poly(glycidyl amine) (PGA) prepared via controlled anionic polymerization followed by postpolymerization modifications demonstrate use PGA-loaded mesoporous silica (SBA-15) streams (flue gas) as well ultradilute (direct air capture). A series PGA materials with varied molecular weight (χn = 15, 25, 50) is...
The oxidative degradation rates of a CO2 sorbent composed mesoporous alumina impregnated with poly(ethylenimine) (PEI) are measured under systematically varied conditions and reaction rate law is created. Good agreement shown between the oxidation obtained via in situ calorimetric heat measurement during reactions loss capture performance presented as amine efficiency (mol CO2/mol amine). PEI mass elemental composition tracked over course used conjunction measurements to shed insight into...
Branched poly(propylenimine) (PPI) provides an alternative to the prototypical amine polymer, commercially available branched poly(ethylenimine) (PEI), in composite adsorbents for CO2 capture. Herein, we investigate synthesis of PPI via cationic ring opening polymerization azetidine using various acid initiators (HBr, HClO4, HCl, CH3SO3H) and times, impacting molecular weight sorption behavior. The kinetics distribution (i.e., primary:secondary:tertiary ratios) are monitored with 1H NMR...
Alkyl-aryl amine-rich small molecules (Ph-X-YY) are prepared by one-step nucleophilic substitution from tri- (X = 3) and hexa-bromine-substituted 6) aromatic cores with two different aliphatic diamines, ethylenediamine (YY ED) propylenediamine PD). The resulting Ph-X-YY impregnated into mesoporous silica support materials (SBA-15) at predetermined organic loadings (20%–60%). TGA DSC analyses suggest that these sorbent have good thermal stability. An increase in the amine loading led to an...
Poly(ethyleneimine) (PEI)-based CO2 sorbents are a promising material class for use in capture applications, particularly direct air (DAC), due to their high amine content and capacities. The sorbent lifetime is key uncertainty the deployment of these materials such as they oxidize under conditions relevant candidate DAC process cycles. Here, we utilize thermogravimetric analysis/differential scanning calorimetry/FTIR spectroscopy characterize nature, rate, quantity volatile species formed...
Abstract Direct air capture (DAC) processes for extraction of CO 2 from ambient are unique among chemical in that they operate outdoors with minimal feed pretreatments. Here, the impact humidity on oxidative degradation a prototypical solid supported amine sorbent, poly(ethylenimine) (PEI) Al O 3 , is explored detail. By combining adsorption measurements, rates, elemental analyses, solid‐state NMR and situ IR spectroscopic analysis conjunction 18 labeling water, comprehensive picture sorbent...