Reaction mechanism of hydrocyanic acid with calcium oxide in sludge pyrolysis: A density functional theory study

HOU Feng-xiao; JIN Jing; WANG Yong-zhen; ZHAI Zhong-yuan; LI Huan-long

Volume 45 Issue 1

Jan. 2017

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Article Navigation > Journal of Fuel Chemistry and Technology > 2017 > 45(1): 123-128

HOU Feng-xiao, JIN Jing, WANG Yong-zhen, ZHAI Zhong-yuan, LI Huan-long. Reaction mechanism of hydrocyanic acid with calcium oxide in sludge pyrolysis: A density functional theory study[J]. Journal of Fuel Chemistry and Technology, 2017, 45(1): 123-128.

Citation:

HOU Feng-xiao, JIN Jing, WANG Yong-zhen, ZHAI Zhong-yuan, LI Huan-long. Reaction mechanism of hydrocyanic acid with calcium oxide in sludge pyrolysis: A density functional theory study[J]. Journal of Fuel Chemistry and Technology, 2017, 45(1): 123-128.

Citation:

HOU Feng-xiao, JIN Jing, WANG Yong-zhen, ZHAI Zhong-yuan, LI Huan-long. Reaction mechanism of hydrocyanic acid with calcium oxide in sludge pyrolysis: A density functional theory study[J]. Journal of Fuel Chemistry and Technology, 2017, 45(1): 123-128.

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Reaction mechanism of hydrocyanic acid with calcium oxide in sludge pyrolysis: A density functional theory study

Department of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Funds:

Key Project in Fundamental Research of Science and Technology Commission of Shanghai Municipality 14JC1404800

Received Date: 2016-10-09
Rev Recd Date: 2016-12-01

Available Online: 2021-01-23

Publish Date: 2017-01-10

Abstract

Abstract

The reaction mechanism of CaO with HCN during low temperature sludge pyrolysis was investigated by density function theory. The geometric optimization and frequency calculations of reactants, products, intermediates and transition state in the reaction pathway were performed at B3LYP/6-311++(3df, 2p) level; single point energy calculation was performed at CCSD (T)/cc-pVQZ level and the total energy was corrected by zero-point energy at B3LYP/6-311++(3df, 2p) level. The results indicate that largest energy barrier (310.33 kJ/mol) appears in proton transition process after 2 HCN molecules are adsorbed on CaO. Arrhenius equation for each step was fitted by classical transition state theory and the reaction rate was calculated at 3 typical temperatures. The results suggest that proton transition is the rate-determining step; moreover, the promoting effect of CaO on HCN is enhanced with the increase of temperature.
- calcium oxide,
- hydrocyanic acid,
- density functional theory,
- transition state theory

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References(31)

References

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