Oxidation of Shenfu Coal with RuO₄ and NaOCl

Abstract

Shenfu coal (SFC) oxidation with RuO 4 and NaOCl were studied and compared. Most of organic matter in SFC was converted into soluble species with either of the oxidants. Benzene polycarboxylic acids (BPCAs) and alkanoic acids (AAs) are the main products from the reactions. The products from SFC oxidation with RuO 4 are rich in long-chain AAs, whereas those with NaOCl predominantly consist of chloro-substituted short-chain AAs and BPCAs. The related reaction mechanisms are discussed according to the experimental results.

Application of mass spectrometry in the characterization of chemicals in coal‐derived liquids

“…Mild oxidation has proved to be an effective approach for providing insights into the macromolecular network structures of coals and producing value‐added chemicals, such as alkanoic acids (AAs), alkanedioic acids (ADAs), and BPCAs (Miura et al, ; Murata et al, ; Huang et al, ; Yao et al, ; Liu et al, ,, ; Lv et al, ). The molecular structures of these carboxylic acids can be determined by GC/MS after esterification with different methods (Murata et al, ; Yao et al, ; Pan et al, ; Lv et al, ; Liu et al, ).…”

“…Mild oxidation has proved to be an effective approach for providing insights into the macromolecular network structures of coals and producing value‐added chemicals, such as alkanoic acids (AAs), alkanedioic acids (ADAs), and BPCAs (Miura et al, ; Murata et al, ; Huang et al, ; Yao et al, ; Liu et al, ,, ; Lv et al, ). The molecular structures of these carboxylic acids can be determined by GC/MS after esterification with different methods (Murata et al, ; Yao et al, ; Pan et al, ; Lv et al, ; Liu et al, ). Coal mild oxidation mainly includes ruthenium ion‐catalyzed oxidation (RICO) (Stock & Wang, , ; Murata et al, , ; Artok et al, ; Kidena et al, ; Huang et al, ; Yao et al, ; Liu et al, ; Wang et al, , ; Lv et al, ), oxidation in H 2 O 2 aqueous solution (Miura et al, ; Mae, Shindo, & Miura, ; Liu et al, , ; Pan et al, ; Doskočil et al, ; Tahmasebi et al, ), and oxidation in NaOCl aqueous solution (Yao et al, ; Liu et al, ,; Wang et al, ), according to different oxidants.…”

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

“…The total yield of CSAAs from PTSFSBC is much lower than that from SFSBC, as shown in Figure 3, suggesting that the formation of CSAAs during oxidation is suppressed by the pretreatment with H 2 O 2 . Yao et al (2010) supposed that CSAAs were produced from the phenolic moiety in SFSBC during oxidation with NaOCl. The phenolic moiety in SFSBC could be converted to other moieties (e.g., carbonyl group-containing ones), which are inert toward chlorination.…”

“…However, these attempts for obtaining valuable chemicals seem to be suitable only for low-rank coals. Due to its easy availability, environmental friendliness, electrolytic renewability, and high reactivity, NaOCl is considered to be an effective oxidant for coal oxidation (Chakrabartty and Kretschmer, 1974;Mayo et al, 1988;Yao et al, 2010). However, the formation of large amounts of chloro-containing species products leads to difficulty both in insight into coal structure and in the product separation.…”

Analysis of Geting Bituminous Coal by Electrospray Ionization and Direct Analysis in Real Time Mass Spectrometry

“…Gasification (Zeng et al 2012), liquefaction (Inoue et al 2012), pyrolysis (Senneca et al 2011), extraction (Giray et al 2000;Griffith et al 2009;Shui, Wang, and Gao 2006), and oxidation (Yao et al 2010) of coals have been widely studied. For example, benzene polycarboxylic acids produced through the oxidation of coal were shown to be useful for synthesizing functional materials, medicine, and aircraft fuel (Yao et al 2010). However, due to the limited knowledge on the composition and structure of coal and its derivatives, its utilization is inefficient and environmental unfriendly (Oguejiofor 2010).…”