Abstract
Cinnamaldehyde- (CMA-) modified coal tar pitches (CTPs) are prepared in the presence of acids. In this paper, the effect of boric acid and p-toluene sulfonic acid on the pyrolysis and graphitization process of CMA-modified CTP was studied. The pyrolysis process was studied by Fourier transform infrared spectroscopy, thermogravimetric analysis and derivative thermogravimetry, and polarized-light microscopy. In addition, the graphitization process was studied by X-ray diffraction and Raman spectroscopy. The results indicate the carbon yield of CMA-modified CTP with boric acid as catalyst (B7C10) is higher than that of CMA-modified CTP with p-toluene sulfonic acid as a catalyst (P7C10). In addition, under the same experimental condition (heated at 400°C and held for 1 h), the mesophase spheres of B7C10 are more regular than those of P7C10 and the largest diameter of the mesophase spheres can reach to 40 um. Further, after the graphitization process, the graphitization degree of B7C10 is higher than that of P7C10. So, it is more effective to modify CTP with boric acid as a catalyst.
Highlights
Coal tar pitch (CTP) is a composite material composed of aromatic compounds with wide molecular weight distribution [1]
We investigate the effect of the two catalysts on the pyrolysis and graphitization process of CMA-modified CTP
It can be observed that B7C10 and P7C10 have lower softening points, toluene insolubles (TI) content, and C/H ratio than those of B0C0
Summary
Effect of Different Catalysts on Properties of Coal Tar Pitch Modified by Cinnamaldehyde. Cinnamaldehyde- (CMA-) modified coal tar pitches (CTPs) are prepared in the presence of acids. The effect of boric acid and p-toluene sulfonic acid on the pyrolysis and graphitization process of CMA-modified CTP was studied. E pyrolysis process was studied by Fourier transform infrared spectroscopy, thermogravimetric analysis and derivative thermogravimetry, and polarized-light microscopy. The graphitization process was studied by X-ray diffraction and Raman spectroscopy. E results indicate the carbon yield of CMA-modified CTP with boric acid as catalyst (B7C10) is higher than that of CMAmodified CTP with p-toluene sulfonic acid as a catalyst (P7C10). After the graphitization process, the graphitization degree of B7C10 is higher than that of P7C10. It is more effective to modify CTP with boric acid as a catalyst
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