Effect of Catalysts on the Pyrolysis of Turkish Zonguldak Bituminous Coal

Öztaş, Nurşen Altuntaş; Yürüm, Yuda

doi:10.1021/ef9901847

Cited by 54 publications

(8 citation statements)

References 25 publications

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“…Oztas et al . 4 blended 5~20 wt% metal chlorides with Zonguldak bituminous coal and found that CoCl 2 and ZnCl 2 increased the coal conversion. Han et al .…”

Section: Introductionmentioning

confidence: 99%

Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst

Liang

Huai

Zhang

et al. 2017

Sci Rep

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A novel process for improving tar yield through catalytic depolymerization of a typical lignite was put forward. The catalytic depolymerization of the lignite over CoCl2 and ZnCl2 catalyst in different concentrations were investigated by a Gray-King apparatus. The optimal catalyst concentrations of CoCl2 and ZnCl2 catalyst that could obtain the highest tar yield was achieved, by which the tar yield increased about 20.3% and 6.6% compared with that of the raw coal, respectively. Different with the traditional catalytic pyrolysis process for which the tar yield decreased, more tar was produced by the catalytic depolymerization method. The GC × GC-MS analysis showed that the components of alkanes and two-ring aromatics in tar increased dramatically with the addition of the optimal CoCl2 and ZnCl2 catalyst. The Raman measurement revealed that more large aromatic ring systems ( > 6 rings) were formed in the char from depolymerization with catalyst and the elemental analysis showed that the hydrogen content decreased slightly. The gas products analysis reflected the contents of methane showed an obvious decrease. All of this reflects that more fragments and small free radicals cracked were enhanced by catalysis in the catalytic depolymerization process, thereby leading to an enhancement of the tar formation possibilities.

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“…Oztas et al . 4 blended 5~20 wt% metal chlorides with Zonguldak bituminous coal and found that CoCl 2 and ZnCl 2 increased the coal conversion. Han et al .…”

Section: Introductionmentioning

confidence: 99%

Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst

Liang

Huai

Zhang

et al. 2017

Sci Rep

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“…However, the absorbance spectra of C―O―C decreased with the increasing of reaction time in CLG process. This is because Fe 2 O 3 reacted with C―OH and ―COOH and formed the transition species of C―O―Fe and ―COO―Fe, which would enhance the surface activity of chars and then improved the fracture of C―O―C. In addition, the absorbance spectra of C―O―C was lower after microwave pretreatment.…”

Section: Resultsmentioning

confidence: 99%

Microwave pretreatment on microalgae: Evolution of gas and char in chemical looping gasification

Jiang

2018

Int J Energy Res

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Summary Chemical looping gasification (CLG) of Chlorella vulgaris was investigated by TGA and FTIR technology. The release characteristic and evolution behavior of gaseous products and bio‐char in different conditions were analyzed to evaluate the effects of CLG and microwave pretreatment. The results indicated that the gas production of CLG was higher than that of SiO2:Chlorella, and it would be higher after microwave pretreatment. CO, CO2, and CH4 were mainly produced in the pyrolysis and gasification stages. After adding Fe2O3, C―O, C═O, and C═C compounds decreased by 3.75%, 20.86%, and 24.72%, respectively. But more CO, CO2, and CH4 were produced. Microwave pretreatment was helpful for reducing the degrees of hydrogen‐rich, aliphatic structure, aromatization, and oxygen‐rich in char. Moreover, microwave pretreatment promoted the reduction of C―O, C═O, and C═C compounds. However, CO increased by 55.63%, and CO2 decreased by 2.31% in this condition. Therefore, microwave pretreatment was beneficial to CLG reaction.

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“…11(a), no matter how ne the coal and catalyst are grounded, they still touched with each other on the solid-solid interface. 15 While in this study, the catalyst dissolved in an accessory ingredient and was sprayed into the coal particles, as shown in Fig. In this case, as shown in Fig.…”

Section: Possible Reasons On Tar Yield Increasesmentioning

confidence: 99%

“…15 The results indicated that the addition of these chlorides increased the conversion signicantly. 14 Nursen et al blended metal chlorides (CoCl 2 , NiCl 2 , ZnCl 2 , CuCl 2 and Fe 2 O 3 $SO 4 ) with coal and used a thermogravimetric analyzer to investigate the effects of these chlorides.…”

Section: Introductionmentioning

confidence: 97%

Mild catalytic depolymerization of low rank coals: a novel way to increase tar yield

et al. 2015

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Mild catalytic depolymerization of two kinds of low-rank coals named as Neimeng and Xinjiang coals sprayed with Mo-and Fe-based catalysts were performed in a batch reactor. The obtained tar was analyzed by gas chromatography/mass spectrometry (GC/MS), and the coal and char were characterized by Raman and Fourier transform infrared spectroscopy (FTIR). The results indicated that the tar yields for Neimeng coal were increased from 3.6% to 5.0% and 7.8% while those for Xinjiang coal were increased from 8.1% to 11.4% and 10.9% after the addition of Mo-and Fe-based catalysts, respectively. Based on the GC/MS analysis, it is found that the hydroxybenzene content was significantly decreased while naphthalene content was increased in the tar derived from Neimeng coal when the Mo-based catalyst was used. In contrast, the production of light aromatics was enhanced by the addition of Fe-based catalyst. For comparison, the production of aromatics from Xinjiang coal was remarkably inhibited but the content of aliphatic hydrocarbon was significantly increased after the addition of the catalyst. The Raman and FTIR analyses results indicated that the catalyst could improve the reaction of hydrogen free radicals with char, which was beneficial to the depolymerization of coal. View Article Onlinewere prepared by grinding the mixture of 1 mg of sample with 200 mg of KBr. The spectra were recorded from 4000 to 400 cm À1 at 8 cm À1 resolution. Raman spectroscopy analysisRaman analyses of coal and char were performed by RENISHAW-in Via Raman Microscope with laser power Fig. 3 GC-MS chromatograms of the primary tar. 2496 | RSC Adv., 2015, 5, 2493-2503 This journal is

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Effect of Catalysts on the Pyrolysis of Turkish Zonguldak Bituminous Coal

Cited by 54 publications

References 25 publications

Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst

Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst

Microwave pretreatment on microalgae: Evolution of gas and char in chemical looping gasification

Mild catalytic depolymerization of low rank coals: a novel way to increase tar yield

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