“This research focused on addressing the pressing issues of greenhouse gas emissions that greatly contribute to climate change. Specifically, the focus was given to the reduction of anthropogenic CO2 emission and its subsequent conversion to commodity chemicals and fuels. In the first part of the research, a series of novel high temperature CO2 adsorbents including double salts (K-Ca and Na-Ca) and metal-doped calcium oxide (Fex@CaO and Gax@CaO) was developed and evaluated. Both sets of materials exhibited high CO2 capacity, fast kinetics, and long-term stability. In particular, at 650 °C, the doped adsorbents comprising of 10 wt% Fe@CaO and 10 wt% Ga@CaO exhibited the highest adsorption capacities of 13.7 and 14.2 mmol/g, respectively, which were at least 2-folds higher than that of the bare CaO. the bare material.
In the second part of the research, an integrated capture-utilization process was designed, developed, and optimized to directly convert CO2 flue gas into syngas and ethylene. In particular, capture performance and catalytic activity of several dual-function materials (DFMs) were investigated for dry reforming of ethane (DRE) to syngas and oxidative dehydrogenation of ethane (ODHE) to ethylene under various process conditions. The DFMs investigated for DRE consisted of K-Ca, Na-Ca, Na-Mg, and K-Mg double salts mixed with Ni@γ-Al2O3, while for ODHE, a series of physically-mixed double salts (or CaO) with Cr@H-ZSM-5 were used. The results reported herein propose a novel integrated process for capture and utilization of waste CO2 into commodity chemicals and fuels in a sustainable manner”--Abstract, page iv.
Rownaghi, Ali A.
Smith, Joseph D.
Fitch, Mark W.
Chemical and Biochemical Engineering
Ph. D. in Chemical Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Carbon capture and utilization update
- Development of potassium- and sodium-promoted CAO adsorbents for CO₂ capture at high temperatures
- Combined capture and utilization of CO₂ for syngas production over dual-function materials
- Improving adsorptive performance of CAO for high temperature CO₂ capture through Fe and Ga doping
- Direct production of ethylene from CO₂ flue gas using an integrated capture-conversion process
xvii, 187 pages
© 2020 Ahmed Adnan Atshan Al-mamoori, All rights reserved.
Dissertation - Open Access
Al-mamoori, Ahmed, "Development of novel materials and processes for direct conversion of CO₂ flue gas to chemicals and fuels" (2020). Doctoral Dissertations. 3032.