自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 17    No. 5    October 2010

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Catalytic hydrolysis of carbonyl sulfide over
modified coal-based activated carbons by loading metal
YI Hong-hong(易红宏), YU Li-li(于丽丽), TANG Xiao-long (唐晓龙),
NING Ping(宁平), LI Hua(李华), WANG Hong-yan(王红妍), YANG Li-na(杨丽娜)

Faculty of Environmental Science and Engineering,
Kunming University of Science and Technology, Kunming 650093, China

Abstract:A novel type of metal oxide/activated carbon catalyst was prepared by sol-gel method for the hydrolysis of carbonyl sulfide (COS). The influences of the calcination temperature, additive content (2.5%−10.0% Fe2O3, mass fraction) and the basic density of the activation process were thoroughly investigated. The surface of catalysts was characterized by Boehm titration. The products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that catalysts with 2.5%−5.0% Fe2O3 after calcining at 500 ℃ have superior activity. The conversion rate of COS increases with increasing the relative density of basic capacity loaded onto activated carbon(AC), and the activity follows the order: KOH>Na2CO3>NaHCO3. Boehm titration data clearly show that the total acidity increases (from 0.06 to 0.48 mmol/g) and the basic groups decrease (from 0.78 to 0.56 mmol/g) after COS hydrolysis and H2S adsorption. The XPS results show that the product of H2S may be absorbed by the interaction with metal compounds and O2 to form sulfate (171.28 eV) and element sulfur (164.44 eV), which lead to catalysts poisoning.

 

Key words: carbonyl sulfide; activated carbon; metal oxide; hydrolysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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