Catalytic effect of alkali and alkaline earth metals in different occurrence modes in Zhundong coals

Catalytic effect of alkali and alkaline earth metals in different occurrence modes in Zhundong coals Two Zhundong coals, Nanlutian coal and Wucaiwan coal, were pretreated by a sequential extraction; alkali and alkaline earth metals (AAEMs) in different occurrence modes were separated from the coal samples. The contents and compositions of AAEMs in coal were investigated, and then a kinetic model was used to quantify their catalytic behavior. Experimental results show that the content of water‐soluble AAEMs is high and that these AAEMs are composed mainly of NaCl and other sodium species. After removing these AAEMs from the Nanlutian coal and the Wucaiwan coal, the activation energy required for gasification increases by 7.679 and 4.035 kJ mol−1, respectively. Some of the sodium, potassium, calcium, and magnesium species exist in ion‐exchangeable form, but the content is low. When the ion‐exchangeable AAEMs were removed, the activation energy increases by 5.117 and 1.400 kJ mol−1, respectively. The content of acid‐soluble AAEMs is high and composed mainly of calcium and magnesium salts. After removing these AAEMs, the activation energy was increased by 2.002 and 0.537 kJ mol−1, respectively. Finally, the content of insoluble AAEMs is very high, and this fraction is composed mainly of silicates and aluminosilicates. As these AAEMs are stable, their catalytic effect could be ignored. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Asia-Pacific Journal of Chemical Engineering Wiley

Catalytic effect of alkali and alkaline earth metals in different occurrence modes in Zhundong coals

13 pages
Read Article

Loading next page...
 
/lp/wiley/catalytic-effect-of-alkali-and-alkaline-earth-metals-in-different-qDn0PsI4s6
Publisher
Wiley
Copyright
Copyright © 2018 Curtin University of Technology and John Wiley & Sons, Ltd.
ISSN
1932-2135
eISSN
1932-2143
D.O.I.
10.1002/apj.2190
Publisher site
See Article on Publisher Site

Abstract

Two Zhundong coals, Nanlutian coal and Wucaiwan coal, were pretreated by a sequential extraction; alkali and alkaline earth metals (AAEMs) in different occurrence modes were separated from the coal samples. The contents and compositions of AAEMs in coal were investigated, and then a kinetic model was used to quantify their catalytic behavior. Experimental results show that the content of water‐soluble AAEMs is high and that these AAEMs are composed mainly of NaCl and other sodium species. After removing these AAEMs from the Nanlutian coal and the Wucaiwan coal, the activation energy required for gasification increases by 7.679 and 4.035 kJ mol−1, respectively. Some of the sodium, potassium, calcium, and magnesium species exist in ion‐exchangeable form, but the content is low. When the ion‐exchangeable AAEMs were removed, the activation energy increases by 5.117 and 1.400 kJ mol−1, respectively. The content of acid‐soluble AAEMs is high and composed mainly of calcium and magnesium salts. After removing these AAEMs, the activation energy was increased by 2.002 and 0.537 kJ mol−1, respectively. Finally, the content of insoluble AAEMs is very high, and this fraction is composed mainly of silicates and aluminosilicates. As these AAEMs are stable, their catalytic effect could be ignored.

Journal

Asia-Pacific Journal of Chemical Engineering – Wiley

Published: Jan 1, 2018

Keywords: ; ; ;

References

  • Pyrolysis behavior of a typical Chinese sub‐bituminous Zhundong coal from moderate to high temperatures
    Zhang, K; Li, Y; Wang, Z‐H
  • Effect of temperature on gasification performance and sodium transformation of Zhundong coal
    Zhang, H‐X; Guo, X‐W; Zhu, Z‐P
  • Transformation of alkali and alkaline‐earth metals during coal oxy‐fuel combustion in the presence of SO2 and H2O
    Wang, L‐Y; Mao, H‐X; Wang, Z‐S; Lin, J‐Y; Wang, M‐J; Chang, L‐P
  • Distribution, occurrence and leaching dynamic behavior of sodium in Zhundong coal
    Zhu, C; Qu, S‐J; Zhang, J; Wang, Y; Zhang, Y‐H
  • Speciation and distribution of sodium during Zhundong coal gasification in a circulating fluidized bed
    Song, W‐J; Song, G‐L; Qi, X‐B; Yang, S‐B; Lu, Q‐G; Nowak, W
  • Mode of occurrence of calcium in various coals
    Matsuoka, K; Rosyadi, E; Tomita, A
  • Improved sequential extraction method for determination of alkali and alkaline earth metals in Zhundong coals
    Yang, Y‐M; Wu, Y‐X; Zhang, H
  • Transformations and roles of sodium species with different occurrence modes in direct liquefaction of Zhundong coal from Xinjiang, Northwestern China
    Li, X; Bai, Z‐Q; Bai, J; Han, Y‐N; Kong, L‐X; Li, W
  • Gasification characteristics and sodium transformation behavior of high‐sodium Zhundong coal
    Zhang, Y‐K; Zhang, H‐X
  • Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part I. Volatilisation of Na and Cl from a set of NaCl‐loaded samples
    Quyn, DM; Wu, H‐W; Li, C‐Z
  • The varying characterization of alkali metals (Na, K) from coal during the initial stage of coal combustion
    Zhang, J; Han, C‐L; Yan, Z
  • Release and transformation of sodium during combustion of Zhundong coals
    Li, G‐Y; Wang, C‐A; Yan, Y; Jin, X; Liu, Y‐H; Che, D‐F
  • Transformation of alkali and alkaline earth metals in low rank coal during gasification
    Matsuoka, K; Yamashita, T; Kuramoto, K; Suzuki, Y; Takaya, A; Tomita, A
  • Fates and roles of alkali and alkaline earth metals during the pyrolysis of a Victorian brown coal
    Li, C‐Z; Sathe, C; Kershaw, JR; Pang, Y
  • Catalytic effects of Na2CO3 additive on coal pyrolysis and gasification
    Ding, L; Zhou, Z‐J; Guo, Q‐H; Huo, W; Yu, G‐S
  • Catalytic gasification activity of Na2CO3 and comparison with K2CO3 for a high‐aluminum coal char
    Wang, Y‐W; Wang, Z‐Q; Huang, J‐J; Fang, Y‐T
  • Catalysis of coal char gasification by alkali metal salts
    McKee, DW; Spiro, CL; Kosky, PG; Lamby, EJ
  • Existence form of sodium in high sodium coals from Xinjiang and its effect on combustion process
    Chen, C; Zhang, S‐Y; Liu, D‐H
  • Mechanisms of alkali metal catalysis in the gasification of coal, char, or graphite
    Wen, W‐Y
  • Effects of char chemical structure and AAEM retention in char during the gasification at 900 °C on the changes in low-temperature char‐O2 reactivity for Collie sub-bituminous coal
    Li, T‐T; Zhang, L; Dong, L
  • Initial deposition feature during high‐temperature pressurized pyrolysis of a typical Zhundong coal
    Lin, X‐C; Yang, Y‐P; Yang, S‐S; Li, S‐Y; Tian, Y‐J; Wang, Y
  • Na‐containing mineral transformation behaviors during Na2CO3‐catalyzed CO2 gasification of high‐alumina coal
    Mei, Y‐G; Wang, Z‐Q; Fang, H‐B; Wang, Y‐W; Huang, J‐J; Fang, Y‐T
  • Solid‐state nuclear magnetic resonance studies of sodium and aluminium in coal
    Howarth, OW; Ratcliffe, GS; Burchill, P
  • Catalytic gasification of a Powder River Basin coal
    Popa, T; Fan, M‐H; Argyle, MD; Slimane, RB; Bell, DA; Towler, BF
  • Coal gasification in CO2 atmosphere and its kinetics since 1948: a brief review
    Irfan, MF; Usman, MR; Kusakabe, K
  • The determination of trace element distributions in coals using sequential chemical leaching—a new approach to an old method
    Spears, DA
  • Measurement and numerical simulation of ultrafine particle size distribution in the early stage of high‐sodium lignite combustion
    Gao, Q; Li, S‐Q; Yang, M‐M; Biswas, P; Yao, Q
  • Influences of heating rate during coal char preparation and AAEMs on volatile–char interaction with different sources of biomass volatile
    Krerkkaiwan, S; Fushimi, C; Yamamoto, H; Tsutsumi, A; Kuchonthara, P
  • Effect of alkali metal catalysts on gasification of coal char
    Veraa, MJ; Bell, AT
  • Unification of gasification kinetics of char in CO2 at elevated temperatures with a modified random pore model
    Liu, H; Luo, C‐H; Kaneko, M; Kato, S; Kojima, T
  • Mechanisms of the alkali metal catalysed gasification of carbon
    McKee, DW

You’re reading a free preview. Subscribe to read the entire article.

Try 2 weeks free now

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

or browse the journals available

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off

Sign up
for free
Start 14 day
Free Trial