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  • Burra, Kiran G.  (20)
  • 1
    Online Resource
    Online Resource
    Syngas evolution and energy efficiency in CO2 assisted gasification of ion-exchanged pine wood
    Elsevier BV ; 2022
    In:  Fuel Vol. 317 ( 2022-06), p. 123549-
    Details
    In: Fuel, Elsevier BV, Vol. 317 ( 2022-06), p. 123549-
    Type of Medium: Online Resource
    ISSN: 0016-2361
    URL: Article
    DOI: 10.1016/j.fuel.2022.123549
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 1483656-7
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  • 2
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    Co-pyrolysis characteristics of waste tire and maize stalk using TGA, FTIR and Py-GC/MS analysis
    Elsevier BV ; 2023
    In:  Fuel Vol. 337 ( 2023-04), p. 127206-
    Details
    In: Fuel, Elsevier BV, Vol. 337 ( 2023-04), p. 127206-
    Type of Medium: Online Resource
    ISSN: 0016-2361
    URL: Article
    DOI: 10.1016/j.fuel.2022.127206
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
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  • 3
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    Carbonization of Cellulose in Supercritical CO2 for Value-Added Carbon
    ASME International ; 2021
    In:  Journal of Energy Resources Technology Vol. 143, No. 7 ( 2021-07-01)
    Details
    In: Journal of Energy Resources Technology, ASME International, Vol. 143, No. 7 ( 2021-07-01)
    Abstract: In this paper, carbonization of biomass in the presence of supercritical CO2 is investigated to obtain carbon solids with enhanced properties and potential to provide a sustainable pathway for high-value solid products which are currently resourced from expensive and carbon driven fossil-fuel routes. Carbonization of cellulose was carried out in supercritical CO2 at temperatures of 523 K and 623 K at ∼100 bar pressure in a stirred reactor for 1–8 h of residence times. The obtained solid residue was characterized for morphology using scanning electron microscopy (SEM), surface graphitization using Raman spectroscopy, thermal stability using thermogravimetric analysis (TGA), and crystallinity using powder X-ray diffraction (XRD). The solid chars were found to be dominated by clusters of microspheres ( & lt;5 μm), especially at temperatures of 623 K. Raman spectroscopy revealed the formation of graphitic crystallite units connected by sp3 carbons (i.e., aliphatic) suggesting significant graphitization. G-band peak ratio was found to be highest for a residence time of 5 h for both the temperatures. TGA data revealed that higher carbonization temperature led to higher thermal decomposition peaks of the chars. The peak value of thermal decomposition ranged between 700 and 800 K for char obtained at 523 K and between 750 and 900 K for char at 623 K. The values were significantly higher than the decomposition peak cellulose at ∼610 K. Proximate analysis results revealed significant increase of fixed carbon content compared with cellulose. Fixed carbon to volatile content ratios revealed increase from 0.052 in cellulose to values ranging from 1.4 to 4.3 making these chars similar in character to coal (with ranking of bituminous coal and petroleum coke). The net yield of solid chars from carbonization was around 50–66% depending upon the extent of carbonization. These results suggest this pathway to produce high yields of high-quality carbon solids with low volatile content, high thermal stability, and significant graphitization. The graphitized carbon offers potential applications in catalysis, electrode materials, pollutant absorption, and energy storage and solid fuels while avoiding drying to remove moisture unlike pyrolysis.
    Type of Medium: Online Resource
    ISSN: 0195-0738 , 1528-8994
    URL: Article
    DOI: 10.1115/1.4050634
    Language: English
    Publisher: ASME International
    Publication Date: 2021
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  • 4
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    Syngas evolution and energy efficiency in CO2-assisted gasification of pine bark
    Elsevier BV ; 2020
    In:  Applied Energy Vol. 269 ( 2020-07), p. 114996-
    Details
    In: Applied Energy, Elsevier BV, Vol. 269 ( 2020-07), p. 114996-
    Type of Medium: Online Resource
    ISSN: 0306-2619
    URL: Article
    DOI: 10.1016/j.apenergy.2020.114996
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 2000772-3
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  • 5
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    Energy Recovery From Composite Acetate Polymer-Biomass Wastes via Pyrolysis and CO2-Assisted Gasification
    ASME International ; 2021
    In:  Journal of Energy Resources Technology Vol. 143, No. 4 ( 2021-04-01)
    Details
    In: Journal of Energy Resources Technology, ASME International, Vol. 143, No. 4 ( 2021-04-01)
    Abstract: Discarded cigarette butts contain polymers, biomass, and a variety of toxins that cause an adverse effect to the human health and environment for years. The cigarette residuals are not recyclable and often get mixed with other kinds of wastes so that much of this waste ends up in landfills. This study investigates the safe disposal of cigarette butts by the thermochemical pathways using pyrolysis and gasification. Mass loss during its thermal decomposition was examined first using a thermogravimetric analyzer. The effect of temperature on the pyrolysis and CO2-assisted gasification was then conducted using a semi-batch reactor with a focus on the flowrate of total syngas and its gas components. Syngas yield, energy recovery, as well as energy efficiency were calculated and compared. The effect of temperature on the CO2 consumption during the gasification process was also examined. The thermal decomposition of cellulose acetate, tar, and wrapping paper were the main contributors during the pyrolysis of cigarette butt. However, the gasification process mainly consisted of the pyrolysis, cracking, and reforming reactions in the gas phase and gasification of char derived from wrapping paper. An increase in temperature enhanced the syngas flowrate, syngas yield, and gas efficiency while decreasing the char yield and reaction time for both the processes. Energy recovery from gasification was higher than pyrolysis due to added CO generation. The maximum syngas energy of 13.0 kJ/g under the gasification condition at 1223 K was 67.2% higher as compared with the pyrolysis. High temperature strongly affected the gasification reaction, while it was negligible at a temperature lower than 1023 K. Complete conversion occurred during gasification at 1223 K that provided only ash residue. The CO2 gasification of cigarette butts provided an effective pathway to utilize 0.5 g CO2/g feedstock at 1223 K to form valuable CO by the Boudouard reaction. Compared with the gasification of other solid wastes, syngas energy yield from cigarette butts was found to be higher than syngas from polystyrene and polyethylene terephthalate. These results support the effectiveness of thermochemical pathways in the rapid conversion of cigarette butts to valuable syngas along with CO2 utilization.
    Type of Medium: Online Resource
    ISSN: 0195-0738 , 1528-8994
    URL: Article
    DOI: 10.1115/1.4048245
    Language: English
    Publisher: ASME International
    Publication Date: 2021
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  • 6
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    Synergistic Effects and Kinetics in Co-Pyrolysis of Waste Tire With Five Agricultural Residues Using Thermogravimetric Analysis
    ASME International ; 2023
    In:  Journal of Energy Resources Technology Vol. 145, No. 12 ( 2023-12-01)
    Details
    In: Journal of Energy Resources Technology, ASME International, Vol. 145, No. 12 ( 2023-12-01)
    Abstract: Continued social and mobility development has caused a sharp increase in the number of waste tires, increased environmental pollution, and waste of limited resources. Agricultural residues as a bioresource, which has drawn increased attention in recent years. The thermochemical conversion of waste tires and agricultural residues and their mixtures offers important prospects for scientific development, which can provide energy security and a much reduced environmental footprint. In this paper, pyrolysis of waste tires and its co-pyrolysis with maize stalk, wheat straw, cotton stalk, rape straw, or peanut shell agricultural residues, in mass ratios of 1:1 were investigated at different heating rate using thermogravimetric analysis. The kinetic parameters were calculated using Flynn–Wall–Ozawa (FWO) and Kissinger–Akahira–Sunose (KAS) kinetic models at heating rates of 20, 30, and 50 °C/min. The synergistic effect between waste tires and agricultural residues was explored by calculating the deviation between the experimental and calculated values. The results showed the presence of a synergistic effect between the co-pyrolysis of waste tires and the residual agricultural residues. In the kinetic analysis, activation energies of waste tires, agricultural residues, and their mixtures were calculated using the two models. The reaction followed a multistage reaction mechanism. The differential thermogravimetry behavior of the mixture was similar to the weighted aggregate results of the waste tire and agricultural waste samples, pyrolyzed separately. These results provide some insights into the combined treatment of waste tires and agricultural waste residues.
    Type of Medium: Online Resource
    ISSN: 0195-0738 , 1528-8994
    URL: Article
    DOI: 10.1115/1.4062826
    Language: English
    Publisher: ASME International
    Publication Date: 2023
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  • 7
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    On deconvolution for understanding synergistic effects in co-pyrolysis of pinewood and polypropylene
    Elsevier BV ; 2020
    In:  Applied Energy Vol. 279 ( 2020-12), p. 115811-
    Details
    In: Applied Energy, Elsevier BV, Vol. 279 ( 2020-12), p. 115811-
    Type of Medium: Online Resource
    ISSN: 0306-2619
    URL: Article
    DOI: 10.1016/j.apenergy.2020.115811
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 2000772-3
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  • 8
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    Energy Recovery of Expired Pistachios From Pyrolysis and CO2-Assisted Gasification
    ASME International ; 2023
    In:  Journal of Energy Resources Technology Vol. 145, No. 1 ( 2023-01-01)
    Details
    In: Journal of Energy Resources Technology, ASME International, Vol. 145, No. 1 ( 2023-01-01)
    Abstract: The amount of food waste due to the product expiration date is growing globally each year. Although the expired food loses its nutritional and safe edible value, it still offers great energy conversion value. In this study, expired pistachios were pyrolyzed and gasified in a semi-batch reactor at temperatures of 873–1223 K. The gases components of the produced syngas were analyzed using a micro-gas chromatograph for the syngas yield, and gases mass flowrates as well as the energy of each component in the syngas were calculated. CO2 consumption from the gasification reaction at different temperatures was also evaluated. Experimental results showed that the syngas yield and syngas energy from pyrolysis and CO2-assisted gasification increased with the in-reaction temperatures. Higher reaction temperature resulted in a shorter reaction time for the evolution of the peak value of the syngas mass flowrate. During pyrolysis, the increase in temperature from 873 to 1223 K enhanced syngas yield by 8.6 times from 1.42 kJ/g to 13.62 kJ/g. However, during the CO2-assisted gasification, syngas energy increased from 5.43 kJ/g to 17.27 kJ/g in the temperature range of 973–1173 K. The CO2 consumption in the gasification of pistachio samples enhanced with the increase in reaction temperature. The mass of CO2 consumption at 1223 K was 0.67 g/g, which was 138 times higher than that of 0.005 g/g at 973 K. Furthermore, at the same temperature (1223 K), the syngas yield from gasification was 1.3 times higher than that from pyrolysis. Thus, higher temperatures promoted the reaction rate of gasification processes as well as the consumption of greenhouse gas (CO2). The CO2-assisted gasification technology is an effective pathway to convert expired food into clean sustainable energy.
    Type of Medium: Online Resource
    ISSN: 0195-0738 , 1528-8994
    URL: Article
    DOI: 10.1115/1.4054788
    Language: English
    Publisher: ASME International
    Publication Date: 2023
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  • 9
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    Co-pyrolysis of waste plastic and solid biomass for synergistic production of biofuels and chemicals-A review
    Elsevier BV ; 2021
    In:  Progress in Energy and Combustion Science Vol. 84 ( 2021-05), p. 100899-
    Details
    In: Progress in Energy and Combustion Science, Elsevier BV, Vol. 84 ( 2021-05), p. 100899-
    Type of Medium: Online Resource
    ISSN: 0360-1285
    URL: Article
    DOI: 10.1016/j.pecs.2020.100899
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2019939-9
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  • 10
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    Acid and Alkali Pretreatment Effects on CO2-Assisted Gasification of Pinewood
    ASME International ; 2022
    In:  Journal of Energy Resources Technology Vol. 144, No. 2 ( 2022-02-01)
    Details
    In: Journal of Energy Resources Technology, ASME International, Vol. 144, No. 2 ( 2022-02-01)
    Abstract: Biomass gasification in CO2 is a promising thermochemical pathway to assist with growing issues of CO2 in the environment. However, high reaction temperature requirement and the low reaction rate is limiting its development. To resolve these issues, the effect of acid and alkali pretreatment on the pyrolysis and CO2 gasification of pinewood was examined using a semi-batch reactor. The temporal behavior of syngas components, energy, and their yield, and energy efficiency was quantified. Results showed that the decreased alkali and alkaline earth metal (AAEM) content using acid pretreatment was beneficial for the CO and syngas yield, while the effect of the increased AAEM content using alkali pretreatment provided a converse trend. In contrast, CO2-assisted gasification of alkali-pretreated biomass improved the CO and syngas yield due to the catalytic influence of AAEM on the Boudouard reaction, while the acid-washed biomass yielded the lowest syngas yield. During gasification, the syngas yield, energy yield, and overall energy efficiency were enhanced by 83.4 (by wt%), 44.6 (by wt%), and 44.6%, respectively, using alkali pretreatment. The results revealed that alkali pretreatment is an effective catalytic incorporation pathway to improve the syngas, energy output, and reactivity to CO2 gasification.
    Type of Medium: Online Resource
    ISSN: 0195-0738 , 1528-8994
    URL: Article
    DOI: 10.1115/1.4051145
    Language: English
    Publisher: ASME International
    Publication Date: 2022
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