Does microwave heating have a role in functional group reactions of coal?

Bodman, Steven; Monsef-Mirzai, Parisa; Manak, Harmindu; McWhinnie, William R.

doi:10.1016/s0016-2361(97)00075-6

Cited by 14 publications

(5 citation statements)

References 29 publications

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“…Application of microwave energy to drying, gasification, desulfurization, pyrolysis, and grindability of coals has been reported. [4][5][6][7][8][9] Monsef-Mirzai et al used microwave energy to energize such reactions as the desulfurization, gasification, and pyrolysis of coals. 8 Reactions were carried out at short time according to thermal processes.…”

Section: Introductionmentioning

confidence: 99%

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Part 1. The Effect of Microwave Receptors on the Liquefaction of Turkish Coals by Microwave Energy in a Hydrogen Donor Solvent

Yağmur¹,

Toğrul²

2005

Energy Fuels

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The effects of microwave receptors to coal (receptor/coal) ratio and the period of heating by microwave energy on the solubilization of Turkish coals (Tunçbilek, Mug̋la-Yatag̋an, Beypazarı lignites, and Zonguldak bituminous coal) in tetralin have been investigated. V2O5 and TiO2 were used as microwave receptors. The changes of liquid product yield indicated that it depended significantly on the type and amount of receptor and the type of coal. A significant increase in the lignite conversions to oil fractions was observed by the addition of the V2O5 receptor. The use of TiO2 receptor decreased the yield of THF soluble coal products. However, both V2O5 and TiO2 receptors decreased the yield of preasphaltene (PAS) and asphaltene (AS) due to their catalytic effect on the coal liquefaction.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, as an energy source, microwave energy has been used in a lot of industrial areas, and it also is being used in coal technology. Application of microwave energy to drying, gasification, desulfurization, pyrolysis, and grindability of coals has been reported. − …”

Section: Introductionmentioning

confidence: 99%

Part 1. The Effect of Microwave Receptors on the Liquefaction of Turkish Coals by Microwave Energy in a Hydrogen Donor Solvent

Yağmur¹,

Toğrul²

2005

Energy Fuels

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“…Extensive research has been conducted on the use of microwave heating in coal sciences, including the drying, gasification, desulfurization, pyrolysis, and grindability [32][33][34][35][36][37][38][39]. Microwave is a nonionizing electromagnetic radiation with frequencies in the range of 300 MHz to 300 GHz.…”

Section: Microwave Irradiationmentioning

confidence: 99%

Combination of Microwave and Ultrasonic Irradiations as a Pretreatment Method to Produce Ultraclean Coal

Royaei

Jorjani

Chelgani

2012

International Journal of Coal Preparation and Utilization

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Coal samples from concentrate of Shahroud coal preparation plant with an ash content of 13.8% and a total sulfur content of 1.89%, without pretreatment and also with pretreatment by microwave irradiation, ultrasonic waves, and microwave followed by ultrasonic (microwave-ultrasonic), was leached with HF and then HNO 3 to produce ultraclean coal (UCC) in a batch reactor. Irradiation pretreatments, in the order of microwave-ultrasonic > ultrasonic > microwave had positive effects on acid leaching with HF, especially for coarse size fractions and early in the leaching process. After HF leaching, the HNO 3 complementary leaching was more effective on the microwave-ultrasonic pretreated sample, where, after processing, 95.5% ash content of the sample was removed. A comparison between sulfur content of samples before (1.89%) and after leaching (HF followed by HNO 3 ) shows that the sulfur content of nonpretreated sample decreased to 1.26%, whereas this reduction for microwave-ultrasonic pretreated sample was more noticeable by 0.8%. The results indicated that microwave-ultrasonic irradiation can be considered as the most effective pretreatment method in the chemical leaching of coal to produce UCC.

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“…These applications are the oxidation of coals (Hayatsu et al, 1978), acidcatalyzed depolymerization (Yürüm and Yiginsu, 1982), and noncatalytic solubization of lignites (Sögüt and Olcay, 1998). Pyrolysis, desulphurisation and dissolution of coals and lignites with microwave energy (Bodman et al, 1997;Şimşek et al, 2001), and γ -irradiation (Tripathi et al, 1991;Ram et al, 1997;Gazso 1997) have been reported in the literature.…”

Section: F Karacan Et Almentioning

confidence: 99%

Photocatalytic Dissolution of Two Turkish Lignites in Tetralin: Effects of UV Irradiation, TiO2 and ZnO as Photocatalyst

2005

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Does microwave heating have a role in functional group reactions of coal?

Cited by 14 publications

References 29 publications

Part 1. The Effect of Microwave Receptors on the Liquefaction of Turkish Coals by Microwave Energy in a Hydrogen Donor Solvent

Part 1. The Effect of Microwave Receptors on the Liquefaction of Turkish Coals by Microwave Energy in a Hydrogen Donor Solvent

Combination of Microwave and Ultrasonic Irradiations as a Pretreatment Method to Produce Ultraclean Coal

Photocatalytic Dissolution of Two Turkish Lignites in Tetralin: Effects of UV Irradiation, TiO2 and ZnO as Photocatalyst

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