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Effect of Biomass Feedstock on Thermochemical Derived Products : = Pure and Binary Mixtures Processing and By-products Upgrading Scenarios.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Effect of Biomass Feedstock on Thermochemical Derived Products :/
其他題名:
Pure and Binary Mixtures Processing and By-products Upgrading Scenarios.
作者:
Molina, Eliezer Antonio Reyes.
面頁冊數:
1 online resource (231 pages)
附註:
Source: Dissertations Abstracts International, Volume: 84-04, Section: B.
Contained By:
Dissertations Abstracts International84-04B.
標題:
Biodiesel fuels. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29342776click for full text (PQDT)
ISBN:
9798351499161
Effect of Biomass Feedstock on Thermochemical Derived Products : = Pure and Binary Mixtures Processing and By-products Upgrading Scenarios.
Molina, Eliezer Antonio Reyes.
Effect of Biomass Feedstock on Thermochemical Derived Products :
Pure and Binary Mixtures Processing and By-products Upgrading Scenarios. - 1 online resource (231 pages)
Source: Dissertations Abstracts International, Volume: 84-04, Section: B.
Thesis (Ph.D.)--North Carolina State University, 2022.
Includes bibliographical references
The global rise in energy demand, solid and liquid fuels, combined with the current increasing levels of environmental pollution, is actually driven humankind transition to search for alternative and renewable energy sources and the bioeconomy. Alongside fossil fuels, lignocellulosic biomass is the most abundant and low-cost resources for second generation biofuels and carbon based materials. Though lignocellulosic biomass offers an alternative source to produce renewable fuels, chemicals, and by-products. Here, the large scale implementation of thermochemical conversion technologies for biomass processing requires an abundant, inexpensive, and high-quality supply of lignocellulosic feedstock. One of the main barriers to achieve this goal include the variability in the chemical and physical properties of accessible biomasses, as well asseasonal and geographic availability. In this work, a series of switchgrass and pine residues blends to produce consistent feedstocks offers a solution to these problems and allows for control over raw material specifications. Physical and chemical properties of the pure, binary feedstock and final products were measured, fast pyrolysis (FP) was carried out on a fluidized bed. Finally, pyrolytic products were also investigated as solid and liquid precursors for the production of bio-based carbon materials (activated carbons and biographite). Results indicate that the physical properties of blended materials are proportional to the blend ratio of pure feedstocks. In addition, pyrolysis of pine residues resulted in bio-oils with higher carbon content and lower oxygen content, while switchgrass derived pyrolysis products contained relatively greater amount of anhydrosugars and organic acids. The distribution of the pyrolysis vapors and isolated bio-oils appear to be a simple linear combination of the two feedstocks. The concentration of alkali and alkaline earthmetals (Ca, K, Mg, and Na) in the blended feedstocks were confirmed to be a critical parameter due to their negative effects on the bio-oil yield. This work demonstrates that blending different sources of biomass can be an effective strategy to produce consistent feedstocks for thermochemical conversion..To assess pyrolytic vapor changes, a novel atline monitoring technique was performed by coupling solid phase micro extraction (SPME) sampling onto the fluidized bed system. Later, gas chromatography mass spectrometry (GC/MS) was used to identify chemical compounds and analyze their chemical changes during the thermal degradation process and better understand the char build-up impact on FP gas-phase reactions.In a second series of studies, a co-located activated carbon (AC) production unit was found to be a promising opportunity for producing adsorbent materials, this co-location is proposed as an extension of the fast pyrolysis process, using the resulting pyrolytic char as precursor for AC production. Here, the physical and chemical properties of biochar derived AC, as well as their adsorptive performance towards toluene removal for different wastewater model streams was evaluated. Moderate surface areas and good adsorption capacities were obtained from switchgrass (SWG) and Pine tops (PT) biochars. The surface areas were 959 and 714 m2 /g for SWG and PT, respectively. The adsorptive capacities were measured with toluene as a model system and ranged between 441-711 and 432 -716 mg/gr for SWG and PT, respectively. The adsorptive capacity followed the Langergren pseudo-second order kinetic model (PSOK), implying a high porous system, suggesting a commercial potential for using pyrolytic biochars as precursors for production of AC.
Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023
Mode of access: World Wide Web
ISBN: 9798351499161Subjects--Topical Terms:
587935
Biodiesel fuels.
Index Terms--Genre/Form:
542853
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The global rise in energy demand, solid and liquid fuels, combined with the current increasing levels of environmental pollution, is actually driven humankind transition to search for alternative and renewable energy sources and the bioeconomy. Alongside fossil fuels, lignocellulosic biomass is the most abundant and low-cost resources for second generation biofuels and carbon based materials. Though lignocellulosic biomass offers an alternative source to produce renewable fuels, chemicals, and by-products. Here, the large scale implementation of thermochemical conversion technologies for biomass processing requires an abundant, inexpensive, and high-quality supply of lignocellulosic feedstock. One of the main barriers to achieve this goal include the variability in the chemical and physical properties of accessible biomasses, as well asseasonal and geographic availability. In this work, a series of switchgrass and pine residues blends to produce consistent feedstocks offers a solution to these problems and allows for control over raw material specifications. Physical and chemical properties of the pure, binary feedstock and final products were measured, fast pyrolysis (FP) was carried out on a fluidized bed. Finally, pyrolytic products were also investigated as solid and liquid precursors for the production of bio-based carbon materials (activated carbons and biographite). Results indicate that the physical properties of blended materials are proportional to the blend ratio of pure feedstocks. In addition, pyrolysis of pine residues resulted in bio-oils with higher carbon content and lower oxygen content, while switchgrass derived pyrolysis products contained relatively greater amount of anhydrosugars and organic acids. The distribution of the pyrolysis vapors and isolated bio-oils appear to be a simple linear combination of the two feedstocks. The concentration of alkali and alkaline earthmetals (Ca, K, Mg, and Na) in the blended feedstocks were confirmed to be a critical parameter due to their negative effects on the bio-oil yield. This work demonstrates that blending different sources of biomass can be an effective strategy to produce consistent feedstocks for thermochemical conversion..To assess pyrolytic vapor changes, a novel atline monitoring technique was performed by coupling solid phase micro extraction (SPME) sampling onto the fluidized bed system. Later, gas chromatography mass spectrometry (GC/MS) was used to identify chemical compounds and analyze their chemical changes during the thermal degradation process and better understand the char build-up impact on FP gas-phase reactions.In a second series of studies, a co-located activated carbon (AC) production unit was found to be a promising opportunity for producing adsorbent materials, this co-location is proposed as an extension of the fast pyrolysis process, using the resulting pyrolytic char as precursor for AC production. Here, the physical and chemical properties of biochar derived AC, as well as their adsorptive performance towards toluene removal for different wastewater model streams was evaluated. Moderate surface areas and good adsorption capacities were obtained from switchgrass (SWG) and Pine tops (PT) biochars. The surface areas were 959 and 714 m2 /g for SWG and PT, respectively. The adsorptive capacities were measured with toluene as a model system and ranged between 441-711 and 432 -716 mg/gr for SWG and PT, respectively. The adsorptive capacity followed the Langergren pseudo-second order kinetic model (PSOK), implying a high porous system, suggesting a commercial potential for using pyrolytic biochars as precursors for production of AC.
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