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RISS 인기검색어
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- 저자 : Yannian Du (검색결과 3 건)
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Guojie Zhang,Yannian Du,Yongfa Zhang,Ying Xu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The reaction between hydrogen and high-sulfur coal at high temperature was investigated. Crashed andsieved high-sulfur coal sample was placed in a 23 mm I.D. differential reactor. The release of hydrogensulfide at run temperature and under different hydrogen atmospheres was recorded by a hydrogensulfide detector. Desulfurization yield was obtained through the elemental analysis of residual char. Thegrain reaction and random pore models were modified to facilitate the description of reaction kineticscharacteristics. Hydrogen was observed to promote the desulfurization rate considerably; i.e., more than65% of sulfur in coal could be removed. The releasing curves of H2S in the hydropyrolysis processexhibited two peaks. The desulfurization process in the hydropyrolysis of high-sulfur coal could beregarded as two stages based on the evolution profiles of H2S. The first peak at 250–450℃ was derivedfrom the desulfurization of aliphatic sulfide. The second peak at 450–650℃ was produced from thesulfur in pyrite and aromatic thiophenic structure. The desulfurization of high sulfur could be describedmore effectively with the grain reaction model than with the random pore model. The random poremodel was only adopted in the initial stage of sulfur removal of high-sulfur coal under hydrogenatmosphere. The grain reaction model was adequate for the entire stage.
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Guojie Zhang,Jiangwen Qu,Yannian Du,Fengbo Guo,Haixiang Zhao,Yongfa Zhang,Ying Xu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
H2O2 was used under different temperatures and pressures to activate three kinds of different semicokes. FTIR, BET, SEM and Boehm titration were used to analyze properties of the semi-cokes surfaces, finding that catalytic activities of these semi-cokes after modification by high temperature and high pressure H2O2 were improved. FTIR shows that the characteristic infrared absorption peak of functional groups on the semi-cokes surface does not change, but the absorption peak intensity of some functional groups is increased. The strength of –OH absorption peak of Hongce lignite (HCL) semi-coke at 3444 cm-1, carboxyl C55O at 1598 cm-1, aliphatic ether, cyclic ether and other organic functional groups at 1023 cm 1 in the modified Shenmu bituminous(SMB) semi-coke and Jincheng anthracite (JCA) semicoke are increased significantly. BET finds that the specific surface area and pore volume of three semicokes are increased after modification. Boehm titration shows that the basic functional group content in semi-coke is increased after modification, and the net alkali content is increased significantly. Compared with the raw semi-coke, SEM shows that the surface of semi-coke modified with H2O2 becomes rough. Modified JCA semi-coke surface pitted with holes, modified HCL and SMB semi-coke surface present porous.
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Guojie Zhang,Yongfa Zhang,Yannian Du,Ying Xu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The effect of different preparation methods on the physicochemical property, reforming reactivity, stability and carbon deposition resistance of cobalt/carbon catalyst was investigated through fixed bed flow reaction. The catalysts were prepared by the impregnation and characterized by the XRD and scanning electron microscopy (SEM). The result indicated that the active components of cobalt/carbon catalyst prepared by using ultrasonic wave distributed evenly, activity was high and the loading time was short. The Co/Carbon catalyst prepared by incipient-wetness impregnation, 10 wt% loading and 300 ℃ calcination, achieved the best activity. Furthermore, the effect of reaction temperature, air speed and CH4/CO2 ratio on the catalyst activity and CO/H2 ratio in products was investigated. It was found that the conversion of CO2 and CH4 increased with the increasing of reaction temperature. However, the conversion of CO2 and CH4 increased first and then decreased with the increasing of air speed. With the increasing of CH4/CO2 in feed gas, both the catalyst activity and the CO/H2 ratio in products decreased.
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