Formation of sulfur trioxide during the SCR of NO with NH3 over a V2O5/TiO2 catalyst

doi:10.1039/c9ra08191g

	Formation of sulfur trioxide during the SCR of NO with NH3 over a V2O5/TiO2 catalyst
	Xiong, Jin 2,3; Li, Yuran 2; Lin, Yuting 2; Zhu, Tingyu 1,2
刊名	RSC ADVANCES
	2019-12-01
卷号	9 期号:67 页码:38952-38961
DOI	10.1039/c9ra08191g
英文摘要	The oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3) is an undesirable reaction that occurs during the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonia (NH3), which is a process applied to purify flue gas from coal-fired power plants. The objectives of this work were to establish the fundamental kinetics of SO3 formation over a V2O5/TiO2 catalyst and to illustrate the formation mechanism of SO3 in the presence of NOx, H2O and NH3. A fixed-bed reactor was combined with a Fourier transform infrared (FTIR) spectrometer and a Pentol SO3 analyser to test the outlet concentrations of the multiple components. The results showed that the rate of SO2 oxidation was zero-order in O-2, 0.77-order in SO2 and -0.19-order in SO3 and that the apparent activation energy for SO2 oxidation was 74.3 kJ mol(-1) over the range of studied conditions. Based on in situ diffuse reflectance infrared Fourier transform (in situ DRIFT) spectroscopy, X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) tests, the SO3 formation process is described here in detail. The adsorbed SO2 was oxidized by V2O5 to produce adsorbed SO3 in the form of bridge tridentate sulfate, and the adsorbed SO3 was desorbed to the gas phase. NOx promoted the oxidation of the adsorbed SO2 due to the promotion of the conversion of low-valent vanadium to high-valent vanadium. In addition, the desorption of the adsorbed SO3 was inhibited by H2O or NH3 due to the conversion of tridentate sulfate to the more stable bidentate sulfate or ammonium bisulfate. Finally, the mechanism of the influence of NOx, H2O and NH3 on the formation of gaseous SO3 was proposed.
资助项目	National Key R&D Program of China[2017YFC0210600] ; National Natural Science Foundation of China[21477131]
WOS关键词	STRUCTURE-REACTIVITY RELATIONSHIPS ; METAL-OXIDE ; SO2 OXIDATION ; FLUE-GAS ; REDUCTION ; DIOXIDE ; DECOMPOSITION ; ADSORPTION
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000501820700006
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/38435]
专题	中国科学院过程工程研究所
通讯作者	Li, Yuran; Zhu, Tingyu
作者单位	1.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Fujian, Peoples R China 2.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Xiong, Jin,Li, Yuran,Lin, Yuting,et al. Formation of sulfur trioxide during the SCR of NO with NH3 over a V2O5/TiO2 catalyst[J]. RSC ADVANCES,2019,9(67):38952-38961.
APA	Xiong, Jin,Li, Yuran,Lin, Yuting,&Zhu, Tingyu.(2019).Formation of sulfur trioxide during the SCR of NO with NH3 over a V2O5/TiO2 catalyst.RSC ADVANCES,9(67),38952-38961.
MLA	Xiong, Jin,et al."Formation of sulfur trioxide during the SCR of NO with NH3 over a V2O5/TiO2 catalyst".RSC ADVANCES 9.67(2019):38952-38961.