TITLE:
Preparation of Activated Carbons from Mongolian Lignite and Sub-Bituminous Coal by a Physical Method
AUTHORS:
Uugantsetseg Gombojav, Irekhbayar Jambal, Enkhsaruul Byambajav
KEYWORDS:
Coal-Based Activated Carbon, Porous Structure, Physical Activation, Micropores, Mesopores
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.8 No.3,
April
21,
2020
ABSTRACT: Preparation
of activated carbons by a physical activation technique is performed using the
methods of coal pyrolysis and gasification at different temperatures. As
increasing pyrolysis temperature from 520°C to 700°C, the yield of activated
carbons from the Khuut (KH) sub-bituminous coal is lowered, and amount of micropores
increases gradually; however there is no development of mesopores by the KH
coal pyrolysis. When the KH coal has a small loss during its physical
activation due to difficulty and inactivity of its macrostructure
decomposition, the smaller porosity is developed in the resulting carbons. The
Aduunchuluun (AD) lignite is activated by pyrolysis and gasification at the
highest temperature of 700°C in the present study. It is identified that the
gasification of AD lignite develops well a porous structure with the highest
surface area of 522 m2/g which is three times larger than that (155
m2/g) of the activated carbon produced by pyrolysis of the same
lignite. The IR and SEM analysis confirm a significant
difference in chemical and structural changes between the AD, KH raw coals and
corresponding carbon samples in the physical activation processes.