The Effect of Pretreatment with H<sub>2</sub>O<sub>2</sub>on the Oxidation of Shenfu Subbituminous Coal with NaOCl

Liu, F.-J.; Wei, Xian‐Yong; Lu, Yao; Yu, Qin; Zhu, Ying; Li, L.; Lv, Jing-Hui; Sun, Bing; Yue, Xiaoming; Zong, Zhi‐Min; Zhao, Wei

doi:10.1080/15567036.2011.557691

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…There are many oxidants such as O 2 [14], H 2 O 2 [15,16], RuO 4 [17,18] and NaOCl [19,20], among which NaOCl is widely adopted in the oxidative depolymerization of LRCs to prepare carboxylic acids due to its low cost, good reactivity and reusable electrolysis [21,22]. Shengli lignite [23] and Shenfu Subbituminous [24] were oxidized by NaOCl, respectively, and BCAs were detected in their resulting oxidation products. However, the yield of BCAs is low and a large number of alphatic acids with small molecules coexist in the watersoluble portion obtained by LRC oxidation, which are different from the resulting products from bituminous coal and anthracite oxidation.…”

Section: Introductionmentioning

confidence: 99%

Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization

et al. 2021

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Oxidative depolymerization of low-rank coals is promising for obtaining benzene carboxylic acids (BCAs). However, it is hindered by the low yield of BCAs along with a large number of alphatic acids. Thermal dissolution could modify the physico-chemical structural features of low-rank coals, which is expected to improve the oxidation of LRCs. In this paper, lignite and subbituminous coal were firstly subjected to thermal dissolution with cyclohexane at 250 °C for 2 h. Then, the raw coal and the corresponding thermal insoluble portion (TIP) were oxidized by NaOCl under the same conditions. The residual yields of TIPs oxidation were both lower than those of raw coals oxidation, indicating that TIPs were more easily oxidized than the raw coals. The yield of BCAs obtained by TIPs oxidation was above 19% higher than that from the oxidation of raw coals. Meanwhile, the selectivity of BCAs was improved in the resulting oxidation products from TIPs compared with that from the raw coals. The relationship between BCAs generation and thermal dissolution of low rank coals was investigated by ultimate analysis, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption analysis. The results suggested that thermal dissolution could enrich aromatic portion in the remaining TIPs, resulting in an increasing of the yield and selectivity of BCAs. Simultaneously, thermal dissolution raised the specific surface area and expanded the looser space structure of TIPS, which were beneficial for the sufficient collision between aromatic structures and oxidant, facilitating the oxidative depolymerization of TIPs. This investigation would provide a novel route for promoting BCAs production by mild oxidative depolymerization of low-rank coals.

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Section: Introductionmentioning

confidence: 99%

Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization

et al. 2021

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“…Low-rank coals (LRCs) are plentiful fossil resources, but they have low calorific value, high water content, high ash yield, poor thermal stability, and easy spontaneous combustion, which make LRCs difficult in the current industrial use, such as combustion, pyrolysis and gasification (Doskočil et al 2014;Liu et al 2019b;Liu et al 2016;Liu et al 2013a;Liu et al 2013b;Liu et al 2013c;Liu et al 2018;Liu et al 2015;Mae et al 2001;Miura et al 1996;Wang et al 2013;Wang et al 2012;Wang et al 2014;Yu et al 2014). Therefore, it is necessary to exploit a new conversion method for utilizing LRCs efficiently based on its structural characteristics (Liu et al 2019b;Liu et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the oxidation of LRCs have attracted much attention from researchers. Classified by the kinds of oxidants, the method of oxidative depolymerization of LRCs includes RuCl 3 -NaIO 4 oxidation (Huang et al 2008;Liu et al 2014;Lv et al 2016;Murata et al 2001;Stock and Wang 3 1986), O 2 oxidation (Wang et al 2013;Wang et al 2012), NaClO oxidation (Liu et al 2013a;Lv et al 2018;Wang et al 2014;Yao et al 2010) and H 2 O 2 oxidation (Doskočil et al 2014;Liu et al 2019b;Liu et al 2018;Liu et al 2015;Mae et al 2001;Miura et al 1996;Tahmasebi et al 2015;Wang et al 2018). The high cost of RuCl 3 -NaIO 4 makes it difficult for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Chen¹,

Zhou²,

Zhao³

et al. 2020

Preprint

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The improvement of the reactivity of H2O2 and Zhundong subbituminous coal (ZS) was focused on in this work. The mild oxidation of ZS was carried out under different conditions. The liquid oxidation products were analyzed using gas chromatography /mass spectrometry (GC/MS). The results suggest that Fe2+ and glacial acetic acid (GAA) have a synergistic effect on the H2O2 oxidation of ZS, which can significantly promote the conversion of ZS and the production of liquid products. In total, 40 compounds are identified, which could be categorized as 8 group components. Most of them are valued-added chemicals. Among the detected compounds, carboxylic acids (CAs) is the most abundant, accounting for 47.22% of all the group components in TRC. Moreover, according to the compounds detected by GC/MS, condensed aromatic rings are significantly abundant than aliphatic moieties in organic matter of ZS. -CH2CH2- are predominant bridged linkages connecting aromatic rings in ZS. The existing forms of organic nitrogen and sulfur species contain quinolins, pyrroles, pyrimidins, quinoxalines, enamides, oxazoles, isoquinolines, thiazols, sulfonamides in ZS.

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Coal Oxidation under Mild Conditions: Current Status and Applications

Jiang

Tahmasebi

et al. 2014

Chem Eng & Technol

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A comprehensive overview of coal oxidation methods under mild conditions is provided, including oxidation with oxygen, ozone, ruthenium ion catalysis, oxidizing acid, electrolysis, sodium hypochlorite, and hydrogen peroxide. The changes in chemical structure of coal during oxidation, the mechanism of different types of oxidation methods, and the possible applications of oxidation products are summarized. Comparison of these oxidation methods demonstrated that hydrogen peroxide and sodium hypochlorite oxidation of coal under mild conditions are the most suitable methods to study the molecular structure of coal and to obtain high‐value organic chemicals. Applications of different analytical techniques for determination and quantification of products and coal structures are also reviewed.

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The Effect of Pretreatment with H₂O₂on the Oxidation of Shenfu Subbituminous Coal with NaOCl

Cited by 7 publications

References 22 publications

Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization

Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Coal Oxidation under Mild Conditions: Current Status and Applications

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The Effect of Pretreatment with H2O2on the Oxidation of Shenfu Subbituminous Coal with NaOCl

Cited by 7 publications

References 22 publications

Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization

Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization

Oxidation of Zhundong subbituminous coal in aqueous Fe2+/ glacial acetic acid solution with H2O2

Coal Oxidation under Mild Conditions: Current Status and Applications

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The Effect of Pretreatment with H₂O₂on the Oxidation of Shenfu Subbituminous Coal with NaOCl