Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates
Atmospheric carbon dioxide (CO₂) concentrations have increased rapidly in recent decades due to the burning of fossil fuels, deforestation, and other industrial practices. The excessive accumulation of CO₂ in the atmosphere leads to global warming, ocean acidification, and other environmental imbala...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/6zs4-5s14 2023-05-15T17:52:02+02:00 Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates Biswas, Akash Neal 2023 https://doi.org/10.7916/6zs4-5s14 English eng https://doi.org/10.7916/6zs4-5s14 Chemical engineering Atmospheric carbon dioxide--Environmental aspects Carbon dioxide mitigation Carbon dioxide--Recycling Renewable energy sources Global warming Electrochemistry Electrocatalysis Theses 2023 ftcolumbiauniv https://doi.org/10.7916/6zs4-5s14 2023-01-07T23:20:05Z Atmospheric carbon dioxide (CO₂) concentrations have increased rapidly in recent decades due to the burning of fossil fuels, deforestation, and other industrial practices. The excessive accumulation of CO₂ in the atmosphere leads to global warming, ocean acidification, and other environmental imbalances, which may ultimately have wider societal implications. One potential solution to closing the carbon cycle is utilizing CO₂, rather than fossil fuels, as the carbon source for fuels and chemicals production. This lowers atmospheric CO₂ levels while simultaneously providing an economic incentive for capturing and converting CO₂ into more valuable products. This dissertation includes studies on three hybrid catalytic reactor systems coupling electrochemistry, thermochemistry, and plasma chemistry for the conversion of CO₂ into value-added oxygenates, such as methanol and C3 oxygenates (propanal and 1-propanol). First, a tandem two-stage system is described where CO₂ is electrochemically reduced into syngas followed by the thermochemical methanol synthesis reaction. The work here specifically focuses on the electrochemical CO₂ reduction reaction to produce syngas with tunable H₂/CO ratios. Using a combination of electrochemical experiments, in-situ characterization, and density functional theory calculations, palladium-, gold-, and silver-modified transition metal carbides and nitrides were found to be promising catalysts for enhancing electrochemical activity while reducing the overall precious metal loading. Second, another tandem two-stage system is demonstrated where CO₂ is electrochemically reduced into ethylene and syngas followed by the thermochemical hydroformylation reaction to produce propanal and 1-propanol. The CO₂ electrolyzer was evaluated with Cu catalysts containing different oxidation states and with modifications to the gas diffusion layer hydrophobicity, while the hydroformylation reactor was tested over a Rh₁Co₃/MCM-41 catalyst. The tandem configuration achieved a C₃ oxygenate selectivity of ... Thesis Ocean acidification Columbia University: Academic Commons |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Chemical engineering Atmospheric carbon dioxide--Environmental aspects Carbon dioxide mitigation Carbon dioxide--Recycling Renewable energy sources Global warming Electrochemistry Electrocatalysis |
spellingShingle |
Chemical engineering Atmospheric carbon dioxide--Environmental aspects Carbon dioxide mitigation Carbon dioxide--Recycling Renewable energy sources Global warming Electrochemistry Electrocatalysis Biswas, Akash Neal Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates |
topic_facet |
Chemical engineering Atmospheric carbon dioxide--Environmental aspects Carbon dioxide mitigation Carbon dioxide--Recycling Renewable energy sources Global warming Electrochemistry Electrocatalysis |
description |
Atmospheric carbon dioxide (CO₂) concentrations have increased rapidly in recent decades due to the burning of fossil fuels, deforestation, and other industrial practices. The excessive accumulation of CO₂ in the atmosphere leads to global warming, ocean acidification, and other environmental imbalances, which may ultimately have wider societal implications. One potential solution to closing the carbon cycle is utilizing CO₂, rather than fossil fuels, as the carbon source for fuels and chemicals production. This lowers atmospheric CO₂ levels while simultaneously providing an economic incentive for capturing and converting CO₂ into more valuable products. This dissertation includes studies on three hybrid catalytic reactor systems coupling electrochemistry, thermochemistry, and plasma chemistry for the conversion of CO₂ into value-added oxygenates, such as methanol and C3 oxygenates (propanal and 1-propanol). First, a tandem two-stage system is described where CO₂ is electrochemically reduced into syngas followed by the thermochemical methanol synthesis reaction. The work here specifically focuses on the electrochemical CO₂ reduction reaction to produce syngas with tunable H₂/CO ratios. Using a combination of electrochemical experiments, in-situ characterization, and density functional theory calculations, palladium-, gold-, and silver-modified transition metal carbides and nitrides were found to be promising catalysts for enhancing electrochemical activity while reducing the overall precious metal loading. Second, another tandem two-stage system is demonstrated where CO₂ is electrochemically reduced into ethylene and syngas followed by the thermochemical hydroformylation reaction to produce propanal and 1-propanol. The CO₂ electrolyzer was evaluated with Cu catalysts containing different oxidation states and with modifications to the gas diffusion layer hydrophobicity, while the hydroformylation reactor was tested over a Rh₁Co₃/MCM-41 catalyst. The tandem configuration achieved a C₃ oxygenate selectivity of ... |
format |
Thesis |
author |
Biswas, Akash Neal |
author_facet |
Biswas, Akash Neal |
author_sort |
Biswas, Akash Neal |
title |
Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates |
title_short |
Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates |
title_full |
Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates |
title_fullStr |
Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates |
title_full_unstemmed |
Hybrid Catalytic Systems for the Sustainable Reduction of Carbon Dioxide to Value-Added Oxygenates |
title_sort |
hybrid catalytic systems for the sustainable reduction of carbon dioxide to value-added oxygenates |
publishDate |
2023 |
url |
https://doi.org/10.7916/6zs4-5s14 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://doi.org/10.7916/6zs4-5s14 |
op_doi |
https://doi.org/10.7916/6zs4-5s14 |
_version_ |
1766159357065560064 |