Effect of CuO receptor on the liquid yield and composition of oils derived from liquefaction of coals by microwave energy

Yağmur, Emine; Şimşek, Emir H.; Aktaş, Zeki; Toğrul, Taner

doi:10.1016/j.enconman.2008.06.021

Cited by 34 publications

(7 citation statements)

References 22 publications

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“…22 MW absorbers not only affect the temperature profile but also the yield of pyrolysis liquid. 32,43,47 The results in this study regarding the ratio of MW absorbers to coal were consistent with those in the abovementioned literature.…”

Section: Effect Of the Residence Time And Mw Receptor/coalsupporting

confidence: 92%

“…Similar results have been reported in the literature. 32,38,47,48 The increased MW receptor/coal ratio resulted in higher heating rates and final pyrolysis temperature, which, in turn, increased the rate of primary products cracking, leading to a sharp increase in the yield of non-condensable gases, as shown in Figure 3.…”

Section: Effect Of the Residence Time And Mw Receptor/coalmentioning

confidence: 99%

“…Coals show significant difference in dielectric properties and, thus, in MW absorption capabilities, which mainly depend upon a range of factors, including coal rank, moisture content, mineral composition, temperature, and frequencies of MW radiation. , The dielectric constant of coal, which affects the MW absorption capacity, is generally low (between 4.7 and 5.3). It has been reported that carbon and some inorganic compounds, such as Fe 3 O 4 , CuO, and V 2 O 5 , undergo remarkable heating under MW and may reach temperatures as high as 700 °C in less than 1 min. , A method of using MW in coal pyrolysis is therefore to mix the coal with an effective receptor of MW energy . The addition of the MW receptor will enhance the heating of materials through conduction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study on Microwave Pyrolysis of an Indonesian Low-Rank Coal

Wang

Tahmasebi

et al. 2013

Energy Fuels

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Microwave pyrolysis of an Indonesian lignite is investigated in this study. The effects of experimental parameters, such as microwave receptor/coal ratio, residence time, temperature, microwave power level, and coal particle size, on the yield and characteristics of coal pyrolysis products were studied systematically. Fe3O4 was used as the microwave receptor. The compositions of oil products from the microwave pyrolysis were analyzed using gas chromatography–mass spectrometry. The experimental results showed that a higher microwave power led to higher heating rates and higher volatile matter yields. The yield of gaseous and oil products increased with increasing the microwave receptor/coal ratio and microwave power. The oil products were complex mixtures of organic compounds with a variety of chemical groups. The yields of aromatic compounds, including phenol and naphthalene, increased significantly with the pyrolysis time. The oil products contained 17.27% saturated aliphatic species, while the aromatic compounds accounted for 45.5%, and polar groups formed 25.84% of pyrolysis oil. As pyrolysis proceeded, Fe3O4 was reduced to elemental Fe at the later stages of microwave pyrolysis, as evidenced by X-ray diffraction and energy-dispersive X-ray analyses. Scanning electron microscopy analysis showed that the morphology of the microwave receptor (Fe3O4) changed as a result of reduction.

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Section: Effect Of the Residence Time And Mw Receptor/coalsupporting

confidence: 92%

Section: Effect Of the Residence Time And Mw Receptor/coalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on Microwave Pyrolysis of an Indonesian Low-Rank Coal

Wang

Tahmasebi

et al. 2013

Energy Fuels

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“…In recent years, there has been a growing interest of microwave heating in coal treatment and a number of potential application of microwave processing have been investigated, including dewatering [2], desulfurization [9], improvement of oil-yield through liquefaction [11], enhancement of grindability [12], and improvement of the rheological characteristics of coal water slurries [13]. However, only few studies investigated on effects of MI treatment on combustion characteristics of LRCs.…”

Section: Introductionmentioning

confidence: 99%

Effects of microwave irradiation treatment on physicochemical characteristics of Chinese low-rank coals

Zhang

Wang

et al. 2013

Energy Conversion and Management

200

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“…Thus, microwave irradiation is an effective modification process for coal. A number of potential applications of microwave irradiation on coal treatment have been investigated and verified, including dewatering [8,30], upgrading [29], desulphurisation [31], increased grindability [32][33][34][35], improved floatability [36], rapid coke making [37], pyrolysis [38] and improved oil yield through liquefaction [39] during coal treatment. The unit energy consumptions for CWS concentration promotion and inherent moisture removal by thermal heat are respectively 214 and 22.5 times higher than by microwave irradiation [11].…”

Section: Introductionmentioning

confidence: 99%