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Meng C.,Institute of Coal Chemical Engineering | Fang Y.,Institute of Coal Chemical Engineering | Jin L.,Institute of Coal Chemical Engineering | Hu H.,Institute of Coal Chemical Engineering
Catalysis Today | Year: 2010

The desulfurization of model gasoline containing 600 ppmw thiophene or dibenzothiophene (DBT) by selective adsorption over Ag+ exchanged mesoporous material Al-MSU-S was studied in a fixed adsorbent bed at ambient temperature and pressure. The results showed that the sulfur capacity increased with Al content incorporated in the silicate framework and Ag+ exchange can effectively improve the desulfurization performance. The best adsorbent, Ag+/20%Al-MSU-S, has adsorption capacity of 5 or 20 ml model gasoline containing thiophene or DBT per gram adsorbent, respectively, before the detection limit in our experiments, as a result of π-complexation. The adsorbent can be regenerated more than six times by simple calcination in air at 350 °C without obvious losing the sulfur adsorption capacity. © 2009 Elsevier B.V. All rights reserved. Source


Jin L.,Institute of Coal Chemical Engineering | Zhou X.,Institute of Coal Chemical Engineering | He X.,Institute of Coal Chemical Engineering | Hu H.,Institute of Coal Chemical Engineering
Fuel | Year: 2013

In this paper, a new process to integrate methane aromatization over Mo/HZSM-5 catalyst with coal pyrolysis was put forward for improving tar yield. Shenmu coal was used to confirm the validity of the process. The effects of pyrolysis temperature, CH4 flow rate, Mo loading on the tar, water and char yields were investigated in an atmospheric fixed-bed reactor containing upper catalyst layer and lower coal layer. The results show that the tar yield can be improved by integrating the coal pyrolysis with methane aromatization. The tar yield is 21.5 wt.% (daf) under the optimum conditions of 700 °C pyrolysis temperature, 25 ml/min CH4 flow rate, 4 wt.% Mo loading and 30 min holding time, obviously higher than 14.6% in N2 atmosphere and 15.3% in H2 atmosphere. Further studies confirm the synergistic effect between the coal pyrolysis and methane aromatization. © 2012 Elsevier Ltd. All rights reserved. Source


Jin L.,Institute of Coal Chemical Engineering | Hu H.,Institute of Coal Chemical Engineering | Zhu S.,Institute of Coal Chemical Engineering | Ma B.,Institute of Coal Chemical Engineering
Catalysis Today | Year: 2010

An improved dealumination method for adjusting the acidity of HZSM-5 was developed by utilizing the self-adsorbed water in HZSM-5. The parent and treated HZSM-5 were characterized by XRD, FT-IR, 27Al MAS NMR, N2 adsorption, XRF and NH3-TPD. The results showed that HZSM-5 can be dealuminated when treated at above 400 °C. About 80% acidic amount was removed from parent HZSM-5 with 8% adsorbed water and more Lewis acid sites were produced after treated at 500 °C. It is thought that the dealumination was mainly caused by its self-adsorbed water. The comparisons of the acidity in dealuminated HZSM-5 by traditionally steaming and improved methods indicated that the latter was more effective in decreasing the acidity and weakening acid strength, and more environmentally benign and timesaving. The method is also applicable to adjust acidity of other zeolites, such as HY, Hβ. © 2009 Elsevier B.V. All rights reserved. Source


Liu J.,Institute of Coal Chemical Engineering | Hu H.,Institute of Coal Chemical Engineering | Jin L.,Institute of Coal Chemical Engineering | Wang P.,Institute of Coal Chemical Engineering | Zhu S.,Institute of Coal Chemical Engineering
Fuel Processing Technology | Year: 2010

A new process to integrate coal pyrolysis with CO2 reforming of methane over Ni/MgO catalyst was put forward for improving tar yield. And several Chinese coals were used to confirm the validity of the process. The experiments were performed in an atmospheric fixed-bed reactor containing upper catalyst layer and lower coal layer to investigate the effect of pyrolysis temperature, coal properties, Ni loading and reduction temperature of Ni/MgO catalysts on tar, water and char yields and CH4 conversion at fixed conditions of 400 ml/min CH4 flow rate, 1:1 CH4/CO2 ratio, 30 min holding time. The results indicated that higher tar yield can be obtained in the pyrolysis of all four coals investigated when coal pyrolysis was integrated with CO2 reforming of methane. For PS coal, the tar, water and char yield is 33.5, 25.8 and 69.5 wt.%, respectively and the CH4 conversion is 16.8%, at the pyrolysis temperature of 750 °C over 10 wt.% Ni/MgO catalyst reduced at 850 °C. The tar yield is 1.6 and 1.8 times as that in coal pyrolysis under H2 and N2, respectively. © 2009 Elsevier B.V. All rights reserved. Source

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