Effects of Ca-based additives on desulfurization during coal pyrolysis

Guan, Rengui; Li, Wen; Li, Baoqing

doi:10.1016/s0016-2361(03)00188-1

Cited by 67 publications

(31 citation statements)

References 12 publications

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“…[13a, 29] According to the X-ray diffraction (XRD) pattern of as-pyrolyzed materialb efore acid etching ( Figure S12), the presence of CaS is confirmed. [30] However,n op eaks attributedt oC aSO 4 is found, which is probably due to its complete reaction with carbon or other reductivec omponents( e.g. carbon monoxidea nd hydrogen) generated during pyrolysis.…”

Section: Resultsmentioning

confidence: 98%

“…The in situ formed sulfide and sulfate may react smoothly with the carbon materials, thereby elevating the content of doped sulfur . According to the X‐ray diffraction (XRD) pattern of as‐pyrolyzed material before acid etching (Figure S12), the presence of CaS is confirmed . However, no peaks attributed to CaSO 4 is found, which is probably due to its complete reaction with carbon or other reductive components (e.g.…”

Section: Resultsmentioning

confidence: 99%

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Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO₃

Qin

Guo

Wang

et al. 2019

Chemistry An Asian Journal

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Heteroatom‐doped porous carbon materials have exhibited promising applications in various fields. In this work, sulfur, nitrogen co‐doped carbon materials (SNCs) with abundant pore structure were prepared by pyrolysis of sulfur, nitrogen‐containing porous organic polymers (POPs) mixed with nano‐CaCO3 at high temperature. Among the resultant materials, SNC‐Ca‐850 possesses a relatively high level of doped heteroatoms and exhibits an excellent catalytic performance for the selective oxidation of benzylic C−H bonds. It is noteworthy that nano‐CaCO3 increases the doped sulfur content in the synthesized carbon materials to a large extent and impacts the existence modes of sulfur. In addition, it enhances the porous structure and specific surface area of the resultant SNCs significantly. This work provides a viable strategy to promote the doping of sulfur into carbon materials during the pyrolysis process.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO₃

Qin

Guo

Wang

et al. 2019

Chemistry An Asian Journal

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“…CaO acted as a catalyst for the formation of NO x at temperatures below 1273 K (1000°C). [26][27][28][29][30] Since the experiments were non-isothermally conducted, the catalytic effect of CaO in low temperature region could not be avoided. When the NO x formation pattern was analyzed at temperatures above 1473 K (1200°C), NO x formation was decreased when compared to anthracite combustion, which is in agreement with previous results.…”

Section: Effect Of the Addition Of Cao And Feo To Coal On X Nomentioning

confidence: 99%

“…[6,24] NO x increased when oxygen content increased-more O 2 was available to react with fuel-N. [23,25] Some studies showed that CaO could enhance the conversion ratio of nitrogen providing a non-desirable effect. [6,[26][27][28][29][30] Wu et al [31] found that FeO played a significant role in decreasing NO concentration formed during coal combustion at 1273 K (1000°C). His research also showed that FeO ability to reduce NO gas increases with experiment temperature.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of NOx Formation from Nitrogen in the Combustion of the Coals Used in Sintering Process

Rocha

Kim

Lee

et al. 2020

Metall Mater Trans B

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The released NO x during fuel combustion is one of the major air pollutants, directly related to acid rain and photochemical smog. At present, there is not an economical and effective method of inhibiting NO x emission from sintering flue gas. Therefore, controlling the conditions of fuel combustion is extremely required for the reduction in NO x. The current research investigated the effects of different combustion parameters on the formation of NO x for three type of coals. The formation of NO x decreased with increasing temperature and heating rate while it increased when oxygen content in an atmosphere increased. Anthracite coal replacement with coke up to 100 pct promoted a decrease in the formed NO x amount and X NO by 21 and 53 pct, respectively. The addition of CaO and FeO enhanced the conversion of nitrogen to NO x , especially at temperatures below 1273 K (1000°C). Taking both the oxidation reaction to form NO x and reduction reaction of NO x to form N 2 into account, the activation energy (E A) values of anthracite and coke were evaluated to be 2.2 and 3.6 kJ/mol, respectively. The combustion of semi-anthracite coal emitted the largest amount of NO x , but the anthracite coal containing less fuel-N than other coals showed the highest value of X NO , which indicates that nitrogen content in coal is not the major factor affecting the formation of NO x. The change in nitrogen functionality after combustion process might be the reason for the unpredicted results in the X NO. The pyrrolic-N in anthracite coal might be considered to be the major functional form that directly affects the conversion of nitrogen to NO.

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“…Furthermore, as is generally acknowledged, pyrolysis (devolatilization) is the key first step in any thermal conversion process mentioned above [22,23], which is inextricably tied up with sulfur transformation [23][24][25][26]. Therefore, the present authors have recently investigated the dual role of conditioner CaO in product distribution and sulfur behavior when sewage sludge was pyrolyzed [27].…”

Section: Introductionmentioning

confidence: 98%

Product distribution and sulfur behavior in sewage sludge pyrolysis: Synergistic effect of Fenton peroxidation and CaO conditioning

Liu

Qiang

Xing

et al. 2015

Fuel

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Effects of Ca-based additives on desulfurization during coal pyrolysis

Cited by 67 publications

References 12 publications

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO₃

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO₃

Mechanism of NOx Formation from Nitrogen in the Combustion of the Coals Used in Sintering Process

Product distribution and sulfur behavior in sewage sludge pyrolysis: Synergistic effect of Fenton peroxidation and CaO conditioning

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Effects of Ca-based additives on desulfurization during coal pyrolysis

Cited by 67 publications

References 12 publications

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO3

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO3

Mechanism of NOx Formation from Nitrogen in the Combustion of the Coals Used in Sintering Process

Product distribution and sulfur behavior in sewage sludge pyrolysis: Synergistic effect of Fenton peroxidation and CaO conditioning

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Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO₃

Controllable Sulfur, Nitrogen Co‐doped Porous Carbon for Ethylbenzene Oxidation: The Role of Nano‐CaCO₃