Regeneration mechanism of a novel high-performance biochar mercury adsorbent directionally modified by multimetal multilayer loading

Li, Jia; Peng, Cheng; Yu, Yue; Chen, Shi-hu; Wang, Chen-xing; Nie, Hao-tian; Wang, Jiancheng; Zhang, Jianchun; Fan, Baoguo; Jin, Yan

doi:10.1016/j.jenvman.2022.116790

Cited by 76 publications

(43 citation statements)

References 28 publications

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“…The pyrolysis characteristic parameters reflecting the thermal stability of coal can be inferred from the TG-DTG curve of coal pyrolysis. Examples include the two obvious weight loss peaks T 1 and T 4 in the DTG curve, the initial pyrolysis temperature T 3 , and the first weight loss peak T 1 , which causes the physical adsorption loss of moisture and small molecular gases in the coal samples . The second weight loss peak T 4 is the temperature point of the maximum weight loss rate, indicating that the pyrolysis intensity of the coal is at a maximum at this temperature.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study on the Dielectric Properties of Coal In Situ with Variable Temperatures

Zhang,

Jia,

Wang

et al. 2024

ACS Omega

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The aim of this study was to explore the mapping relationship between the temperature and the dielectric parameters of coal and rock under variable temperatures as well as to determine the characteristics of a dielectric anomaly response. Experiments were performed using lignite, nonstick coal, gas coal, coking coal, and anthracite. The evolution of pyrolysis characteristics, microcrystal structure, and dielectric properties with changing temperature was investigated, and the changes in the dielectric parameters of coal and rock were comprehensively analyzed. As such, the cause of the dielectric anomaly with changing temperatures of coal and rock was revealed. The results show that the dielectric properties of coal at different pyrolysis temperatures are closely related to the degree of intermolecular thermal motion, the evolution of microcrystal structure, and the mechanism of polarization response. In the low-temperature stage, the thermal motion of coal molecules is weak and exhibits electronic polarization, and the dielectric parameters change slightly with temperature while being dependent on the moisture content. In the high-temperature pyrolysis stage, the intense molecular thermal motion leads to the breaking of chemical bonds and the release of volatiles; moreover, the distance between aromatic layers of coal decreases, the order of aromatic structure increases, the dipole turning polarization is the main polarization type, and the dielectric response is obvious. When the pyrolysis reaction is basically complete, the dielectric constants of the five coal samples reach the maximum. As the temperature increases continuously, the coal structure is destroyed by the weakening of the thermal motion of the coal molecules and the accumulation of thermal stress; meanwhile, the dielectric constant decreases gradually, while the dielectric loss and tangent of dielectric loss increase rapidly. At the same temperature, the dielectric constant decreases with an increase in test frequency. These results lay a foundation for the inversion of dielectric data in fire areas of coal mines.

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Section: Resultsmentioning

confidence: 99%

Experimental Study on the Dielectric Properties of Coal In Situ with Variable Temperatures

Zhang,

Jia,

Wang

et al. 2024

ACS Omega

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“…Although there are many studies on inorganic–biomass composite aerogels, they have mainly focused on the comparison of materials used. Several articles have been published on the effect of structural design on the adsorption properties of the material [ 31 ], but there are few studies on the thermal and flame-retardant properties of composite aerogels. Physical co-mingling and interpenetrating network (IPN) methods are the most commonly used methods to prepare composite aerogels.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of the Preparation Method of Konjac Glucomannan-Silica Aerogels on the Microstructure, Thermal Insulation, and Flame-Retardant Properties

et al. 2023

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Natural polysaccharides with high viscosity, good thermal stability, and biocompatibility can improve the mechanical properties of inorganic silica aerogels and enhance their application safety. However, the effects of the preparation methods of polysaccharide-silica aerogels on their microstructure and application properties have not been systematically studied. To better investigate the effect of the microstructure on the properties of aerogel materials, two aerogels with different structures were prepared using Konjac glucomannan (KGM) and tetraethoxysilane (TEOS) via physical blending (KTB) and co-precursor methods (KTC), respectively. The structural differences between the KTB and KTC aerogels were characterized, and the thermal insulation and fire-retardant properties were further investigated. The compressive strength of the KTC aerogels with a cross-linked interpenetrating network (IPN) structure was three times higher than that of the KTB aerogels, while their thermal conductivity was 1/3 of that of the KTB aerogels. The maximum limiting oxygen index (LOI) of the KTC aerogels was 1.4 times, the low peak heat release rate (PHRR) was reduced by 61.45%, and the lowest total heat release (THR) was reduced by 41.35% compared with the KTB aerogels. The results showed that the KTC aerogels with the IPN have better mechanical properties, thermal insulation, and fire-retardant properties than the simple physically blending KTB aerogels. This may be due to the stronger hydrogen-bonding interactions between KGM and silica molecules in the KTC aerogels under the unique forcing effect of the IPN, thus enhancing their structural stability and achieving complementary properties. This work will provide new ideas for the microstructure design of aerogels and the research of new thermal insulation and fire-retardant aerogels.

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“…More importantly, in the fuel reactor, solid biomass, small molecular gas products (CO, CH 4 ), biochar, bio-oil and oxygen carrier reactions will interact with each other. For example, biochar will hinder the reduction of pyrolysis gas to oxygen carrier, and tar will affect the pore structure of biochar [ 16 , 17 ]. If a chemical looping is coupled to a polygeneration system, biochar, bio-oil, pure hydrogen and sequestration-ready CO 2 can be obtained simultaneously.…”

Section: Introductionmentioning

confidence: 99%

New Process Combining Fe-Based Chemical Looping and Biomass Pyrolysis for Cogeneration of Hydrogen, Biochar, Bio-Oil and Electricity with In-Suit CO2 Separation

Zhou

Jin

et al. 2023

Molecules

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Fe-based chemical looping gasification is a clean biomass technology, which has the advantage of reducing CO2 emissions and the potential of self-sustaining operation without supplemental heating. A novel process combining Fe-based chemical looping and biomass pyrolysis was proposed and simulated using Aspen Plus. The biomass was first subjected to pyrolysis to coproduce biochar, bio-oil and pyrolysis gas; the pyrolysis gas was subjected to an Fe looping process to obtain high-purity hydrogen and carbon dioxide. The influences of the pyrolysis reactor operating temperature and fuel reactor operation temperature, and the steam reactor and air reactor on the process performance are researched. The results showed that, under the operating condition of the established process, 23.07 kg/h of bio-oil, 24.18 kg/h of biochar, 3.35 kg/h of hydrogen and a net electricity of 3 kW can be generated from 100 kg/h of rice straw, and the outlet CO2 concentration of the fuel reactor was as high as 80%. Moreover, the whole exergy efficiency and total exergy loss of the proposed process was 58.98% and 221 kW, respectively. Additionally, compared to biomass direct chemical looping hydrogen generation technology, the new process in this paper, using biomass pyrolysis gas as a reactant in the chemical looping hydrogen generation process, can enhance the efficiency of hydrogen generation.

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Regeneration mechanism of a novel high-performance biochar mercury adsorbent directionally modified by multimetal multilayer loading

Cited by 76 publications

References 28 publications

Experimental Study on the Dielectric Properties of Coal In Situ with Variable Temperatures

Experimental Study on the Dielectric Properties of Coal In Situ with Variable Temperatures

Study on the Influence of the Preparation Method of Konjac Glucomannan-Silica Aerogels on the Microstructure, Thermal Insulation, and Flame-Retardant Properties

New Process Combining Fe-Based Chemical Looping and Biomass Pyrolysis for Cogeneration of Hydrogen, Biochar, Bio-Oil and Electricity with In-Suit CO2 Separation

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