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Full text release has been delayed at the author's request until August 06, 2028

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Chemical Looping Strategies for Sustainable NOx Purification and Enhanced Syngas Production

Mohapatra, Pinak Bhusan
http://rave.ohiolink.edu/etdc/view?acc_num=osu1689765185698597

Abstract Details

2023, Doctor of Philosophy, Ohio State University, Chemical Engineering.
The growing global energy demand, intensified by industrial development and improved living standards, is exacerbating environmental pollution. Conventional fossil fuel-fired power plants, which are primary sources of electricity, generate substantial quantities of pollutants such as carbon dioxide and nitrogen oxides. A viable solution for generating clean energy and mitigating pollution is chemical looping (CL). Chemical looping is an innovative redox platform that employs solid oxygen carriers to facilitate oxygen transfer between oxidizing and reducing agents. This process prevents their direct contact, thereby eliminating the need for downstream gas purification and resulting in increased cost savings. Moreover, chemical looping technologies inherently improve energy efficiency, consequently reducing entropy generation and exergy loss. In the first part, we investigated a novel approach to NOx purification based on CL principles. This method uses cheaper natural gas as the reductant to effectively eliminate nitrogen oxides instead of NH3. Compared to the traditional selective catalytic reduction (SCR) process, our technique demonstrated an improvement in both exergy efficiency and effective thermal efficiency. The key to this method was employing Nickel Oxide (NiO) as the solid oxygen carrier, which enables the transfer of oxygen from NOx to CH4 without direct contact, thus avoiding environmental issues related to the SCR process such as “Ammonia slip” and catalyst instability. Tests with various oxide-based supports were conducted, with alumina-supported NiO showing superior performance in terms of NOx purification and CH4 regeneration. This NOx purification method was tested in a fixed-bed reactor, displaying optimal reaction kinetics at lower residence times and high CH4 conversion rates, thus proving its potential in mitigating NOx emissions. In the second part of our study, we explored Ca2Fe2O5 as the oxygen carrier for the production of syngas, a crucial element in manufacturing many value-added products. Our focus was on enhancing the fuel conversion, syngas yield and energy efficiency using chemical looping reforming (CLR) of natural gas. CLR outperformed autothermal reforming (ATR) in terms of natural gas conversion and syngas yield. A major improvement was observed when doping the carrier with Ni, significantly enhancing the reactivity across a broad temperature range. Our findings underscore the potential of CLR for efficient syngas generation and CO2 utilization, offering a promising and sustainable solution to the current energy challenges.
Prof. Liang-Shih Fan (Advisor)
Prof. Andre Palmer (Committee Member)
Prof. X. Margaret Liu (Committee Member)
Prof. Kelley Tilmon (Committee Member)
205 p.
Chemical Engineering
NOx purification, Chemical looping, Natural gas reforming, Oxygen carrier

Recommended Citations

Citations

  • Mohapatra, P. B. (2023). Chemical Looping Strategies for Sustainable NOx Purification and Enhanced Syngas Production [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1689765185698597

    APA Style (7th edition)

  • Mohapatra, Pinak. Chemical Looping Strategies for Sustainable NOx Purification and Enhanced Syngas Production. 2023. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1689765185698597.

    MLA Style (8th edition)

  • Mohapatra, Pinak. "Chemical Looping Strategies for Sustainable NOx Purification and Enhanced Syngas Production." Doctoral dissertation, Ohio State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=osu1689765185698597

    Chicago Manual of Style (17th edition)

osu1689765185698597
© 2023, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.
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