Introduction manner of sulfate acid for improving the performance of SO42-/CEO2 on selective catalytic reduction of NO by NH3

A series of sulfated CeO2 catalysts were synthesized by impregnation and sol-gel methods and used for selective catalytic reduction （SCR） of NOx by NH3. The results showed that the sulfated CeO2 catalysts prepared by sol-gel method showed excellent catalytic activity at 150-50 ℃, and more than 90% N...

Full description

Saved in:
Bibliographic Details
Published inJournal of rare earths Vol. 34; no. 7; pp. 667 - 674
Main Author 宋忠贤 张秋林 宁平 刘昕 樊洁 黄真真
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2016
Subjects
micro-structure
NH3
NOx
rare earths
selective catalytic reduction
sulfated CeO2
surface acidity
引入方式
氧化还原性能
氧化铈
溶胶-凝胶法
硫酸铈
选择性催化还原
micro-structure
sulfated CeO2
selective catalytic reduction
surface acidity
rare earths
Online AccessGet full text

Cover

More Information
Summary:A series of sulfated CeO2 catalysts were synthesized by impregnation and sol-gel methods and used for selective catalytic reduction （SCR） of NOx by NH3. The results showed that the sulfated CeO2 catalysts prepared by sol-gel method showed excellent catalytic activity at 150-50 ℃, and more than 90% NOx conversion was obtained at 232-450 ℃ with a gas hourly space velocity of 60000 h-1. The catalysts were characterized by X-ray diffraction （XRD）, N2 adsorption, Raman, thermogravimetry （TG）, H2-tem- perature-programmed reduction （H2-TPR） and Py-infrared spectroscopy （Py-IR）. The excellent SCR performance was associated with the surface acidity and the micro-structure. The introduction of sulfate acid into CeO2 could increase the amount of BrOnsted and Lewis acid sites over the catalysts, resulting in the improvement of the low temperature activity. The sulfated CeO2 catalysts prepared by sol-gel method possessed lower crystallization degree, excellent redox property and larger specific surface areas, which were responsible for the superior SCR performance.
Bibliography:11-2788/TF
A series of sulfated CeO2 catalysts were synthesized by impregnation and sol-gel methods and used for selective catalytic reduction （SCR） of NOx by NH3. The results showed that the sulfated CeO2 catalysts prepared by sol-gel method showed excellent catalytic activity at 150-50 ℃, and more than 90% NOx conversion was obtained at 232-450 ℃ with a gas hourly space velocity of 60000 h-1. The catalysts were characterized by X-ray diffraction （XRD）, N2 adsorption, Raman, thermogravimetry （TG）, H2-tem- perature-programmed reduction （H2-TPR） and Py-infrared spectroscopy （Py-IR）. The excellent SCR performance was associated with the surface acidity and the micro-structure. The introduction of sulfate acid into CeO2 could increase the amount of BrOnsted and Lewis acid sites over the catalysts, resulting in the improvement of the low temperature activity. The sulfated CeO2 catalysts prepared by sol-gel method possessed lower crystallization degree, excellent redox property and larger specific surface areas, which were responsible for the superior SCR performance.
sulfated CeO2; selective catalytic reduction; surface acidity; micro-structure; rare earthsO
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(16)60077-7