TY - JOUR
T1 - Pore structure development of in-situ pyrolyzed coals for pollution prevention in iron foundries
AU - Huang, He
AU - Wang, Yujue
AU - Cannon, Fred S.
N1 - Funding Information:
This research is founded by National Science Foundation, Material Use: Science, Engineering, and Society program. The authors would also like to thank Ms. Magda N. Salama from Material Research Institute at The Pennsylvania State University for her help in TGA-MS analysis.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/9
Y1 - 2009/9
N2 - A protocol was devised for preparing pyrolyzed coals that could be made in-situ at foundries to capture volatile organic compound (VOC) emission. This pyrolysis created extensive micropore volume in lignite over a broad range of temperature and time; and could use waste heat from cupola exhaust gases by a heat-exchange tube. For foundry application, moderate porous carbon with relatively uniform pores over wide ranges of temperature and time would be more practical than highly porous activated carbon (AC) that requires narrowly-controlled operations. This pyrolysis protocol was developed in a thermogravimetric analyzer (TGA) and in a small tube furnace, while using lignite, bituminous coal, and anthracite. The lignite yielded the most pore volume; and this was relatively uniform (0.1-0.13 mL/g of pores) while temperatures were 600-900 °C, and times were 0-60 min. Smaller grain sizes yielded improved porosity; and this corresponded to more release of phenols and naphthalenes from smaller grains, as discerned by TGA-mass spectroscopy (MS). TGA-MS also revealed that improved pore development between 600-800 °C corresponded to the release of CO2 and H2O; and concurrently higher slurry pH linked to less oxygenated functionality. Adsorption of benzene was compared between the in-situ porous carbon and a commercial AC.
AB - A protocol was devised for preparing pyrolyzed coals that could be made in-situ at foundries to capture volatile organic compound (VOC) emission. This pyrolysis created extensive micropore volume in lignite over a broad range of temperature and time; and could use waste heat from cupola exhaust gases by a heat-exchange tube. For foundry application, moderate porous carbon with relatively uniform pores over wide ranges of temperature and time would be more practical than highly porous activated carbon (AC) that requires narrowly-controlled operations. This pyrolysis protocol was developed in a thermogravimetric analyzer (TGA) and in a small tube furnace, while using lignite, bituminous coal, and anthracite. The lignite yielded the most pore volume; and this was relatively uniform (0.1-0.13 mL/g of pores) while temperatures were 600-900 °C, and times were 0-60 min. Smaller grain sizes yielded improved porosity; and this corresponded to more release of phenols and naphthalenes from smaller grains, as discerned by TGA-mass spectroscopy (MS). TGA-MS also revealed that improved pore development between 600-800 °C corresponded to the release of CO2 and H2O; and concurrently higher slurry pH linked to less oxygenated functionality. Adsorption of benzene was compared between the in-situ porous carbon and a commercial AC.
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U2 - 10.1016/j.fuproc.2009.05.015
DO - 10.1016/j.fuproc.2009.05.015
M3 - Article
AN - SCOPUS:68249090824
VL - 90
SP - 1183
EP - 1191
JO - Fuel Processing Technology
JF - Fuel Processing Technology
SN - 0378-3820
IS - 9
ER -