NO/NH3 adsorption properties on γ-Al2O3 (110) surface during SCR process

CAO Fan; SU Sheng; XIANG Jun; WANG Pengying; HU Song; SUN Lushi; ZHANG Anchao

doi:10.3969/j.issn.0438-1157.2014.10.040

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NO/NH₃ adsorption properties on γ-Al₂O₃ (110) surface during SCR process

更新时间：2025-12-10

- NO/NH₃ adsorption properties on γ-Al₂O₃ (110) surface during SCR process
- CIESC Journal Issue 10, Pages: 4056-4062(2014)
- 作者机构：
  
  1. 华中科技大学煤燃烧国家重点实验室,湖北,武汉,430074
  2. 河南理工大学机械与动力工程学院,河南,焦作,454000
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.10.040
  CLC： 647.32
- Online First：05 October 2014，
  
  Published：05 October 2014
- 稿件说明：
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CAO Fan, SU Sheng, XIANG Jun, et al. NO/NH₃ adsorption properties on γ-Al₂O₃ (110) surface during SCR process[J]. CIESC Journal, 2014, (10): 4056-4062. DOI: 10.3969/j.issn.0438-1157.2014.10.040.
DOI：

CAO Fan, SU Sheng, XIANG Jun, et al. NO/NH₃ adsorption properties on γ-Al₂O₃ (110) surface during SCR process[J]. CIESC Journal, 2014, (10): 4056-4062. DOI: 10.3969/j.issn.0438-1157.2014.10.040. DOI：

摘要

采用密度泛函理论（DFT）方法研究了NO和NH3在完整和有缺陷的γ-Al2O3（110）表面吸附与SCR（选择催化还原）反应特性。研究表明，NO在完整的（110）表面的吸附作用较弱，而NH3分子的吸附作用较强，NH3分子在Al原子顶位可形成稳定吸附。反应路径研究结果表明完整的（110）表面上SCR反应的决速步为-NH2NO基团的分解，反应的最大能垒为235.75 kJ·mol-1。对于产生氧空穴的有缺陷（110）表面，NO和NH3均可稳定吸附，NH3在吸附过程中可直接裂解成NH2和H。另外，SCR反应在有缺陷（110）表面的最大能垒明显较低，说明氧空穴的存在促进了SCR脱硝反应的进行。

Abstract

γ-Al2O3 is an outstanding catalyst carrier and has been widely used in the SCR (selective catalytic reduction) catalyst study. The adsorption and reaction properties of NO/NH3 on the bare and defective γ-Al2O3 (110) surface were studied by the DFT (density functional theory) method. The corresponding microscopic parameters

such as adsorption energies

bond length

changes of net charge and PDOS (partial density of states) were calculated. NO could be adsorbed on the bare (110) surface weakly

and it was more inclined to be adsorbed on the top sites of O2c. NH3 could be adsorbed strongly on top sites of Al. The rate-determining step of SCR reaction was the -NH2NO decomposition

while the largest energy barrier reached 235.75 kJ·mol-1. For the defective (110) surface with the oxygen vacancy

NO and NH3 could be both adsorbed strongly on the surface

and NH3 could also decompose into NH2 and H directly in this situation. The largest energy barrier of SCR reaction in this situation was much lower

indicating that the presence of oxygen vacancy could promote SCR reaction proceeding.

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