PMID- 22054590
OWN - NLM
STAT- MEDLINE
DCOM- 20120613
LR  - 20151119
IS  - 1095-8630 (Electronic)
IS  - 0301-4797 (Linking)
VI  - 93
IP  - 1
DP  - 2012 Jan
TI  - Feasibility of CO(2)/SO(2) uptake enhancement of calcined limestone modified with 
      rice husk ash during pressurized carbonation.
PG  - 235-44
LID - 10.1016/j.jenvman.2011.08.023 [doi]
AB  - The calcination/carbonation cycle using calcium-based sorbents appears to be a 
      viable method for carbon dioxide (CO(2)) capture from combustion gases. Recent 
      attempts to improve the CO(2)/SO(2) uptake of a calcium-based sorbent modified by 
      using rice husk ash (RHA) in the hydration process have succeeded in enhancing 
      its effectiveness. The optimal mole ratio of RHA to calcined limestone (M(Si/Ca)) 
      was adjusted to 0.2. The cyclic CO(2) capture characteristics and the SO(2) uptake 
      activity of the modified sorbent were evaluated in a calcination/pressurized 
      carbonation reactor system. Scanning electron microscope (SEM) images and X-ray 
      diffraction (XRD) spectrum of the sorbent were also taken to supplement the 
      study. The results showed that the carbonation conversion was greatly increased 
      for the sorbent with M(Si/Ca) ratio of 0.2. For this sorbent formulation the 
      optimal operating conditions were 700-750  degrees C and 0.5-0.7 MPa. CO(2) absorption was 
      not proportional to CO(2) concentration in the carbonation atmosphere, but was 
      directly related to reaction time. The CO(2) uptake decreased in the presence of 
      SO(2). SO(2) uptake increased, and the total calcium utilization was maintained over 
      multiple cycles. Analysis has shown that the silicate component is evenly or well 
      distributed, and this serves as a framework to prevent sintering, thus preserving 
      the available microstructure for reaction. The sorbent also displayed high 
      activity to SO(2) absorption and could be used to capture CO(2) and SO(2) 
      simultaneously.
CI  - Copyright (c) 2011 Elsevier Ltd. All rights reserved.
FAU - Chen, Huichao
AU  - Chen H
AD  - School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
FAU - Zhao, Changsui
AU  - Zhao C
FAU - Ren, Qiangqiang
AU  - Ren Q
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20111015
PL  - England
TA  - J Environ Manage
JT  - Journal of environmental management
JID - 0401664
RN  - 0 (Air Pollutants)
RN  - 0 (Fossil Fuels)
RN  - 0UZA3422Q4 (Sulfur Dioxide)
RN  - 142M471B3J (Carbon Dioxide)
RN  - H0G9379FGK (Calcium Carbonate)
SB  - IM
MH  - Absorption
MH  - Air Pollutants/*chemistry
MH  - Calcium Carbonate/*chemistry
MH  - Carbon Dioxide/*chemistry
MH  - Environmental Restoration and Remediation/*methods
MH  - Feasibility Studies
MH  - Fossil Fuels
MH  - Kinetics
MH  - Microscopy, Electron, Scanning
MH  - Oryza/*chemistry
MH  - Pressure
MH  - Sulfur Dioxide/*chemistry
MH  - Temperature
MH  - X-Ray Diffraction
EDAT- 2011/11/08 06:00
MHDA- 2012/06/14 06:00
CRDT- 2011/11/08 06:00
PHST- 2011/01/07 00:00 [received]
PHST- 2011/08/08 00:00 [revised]
PHST- 2011/08/23 00:00 [accepted]
PHST- 2011/11/08 06:00 [entrez]
PHST- 2011/11/08 06:00 [pubmed]
PHST- 2012/06/14 06:00 [medline]
AID - S0301-4797(11)00339-2 [pii]
AID - 10.1016/j.jenvman.2011.08.023 [doi]
PST - ppublish
SO  - J Environ Manage. 2012 Jan;93(1):235-44. doi: 10.1016/j.jenvman.2011.08.023. Epub 
      2011 Oct 15.