High hydrothermal stability of Cu-SAPO-34 catalysts for the NH3-SCR of NOx

被引：133

作者：

Niu, Can ^{[1
]}

Shi, Xiaoyan ^{[1
]}

Liu, Fudong ^{[1
,2
]}

Liu, Kuo ^{[1
]}

Xie, Lijuan ^{[1
]}

You, Yan ^{[1
]}

He, Hong ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Joint Lab Environm Simulat & Pollut Con, Ecoenvironm Sci Res Ctr, 18 ShuangQing Rd, Beijing 100085, Peoples R China

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA

来源：

CHEMICAL ENGINEERING JOURNAL | 2016年 / 294卷

基金：

中国国家自然科学基金;

关键词：

Cu-SAPO-34; NH3-SCR; Hydrothermal stability; Copper species; CALCINATION-TEMPERATURE; ACTIVE-SITES; DIESEL-ENGINE; REDUCTION SCR; CU/SAPO-34; ZEOLITE; PERFORMANCE; NH3; CU-SSZ-13; EMISSIONS;

D O I：

10.1016/j.cej.2016.02.086

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The effects of calcination temperature, Cu source and co-template contents on the activity and hydrothermal stability of Cu-SAPO-34 catalysts prepared by the one-pot hydrothermal synthesis method were investigated. Appropriate calcination temperature was important for the deNOx activity of Cu-SAPO-34 catalyst. The amount of Cu source and co-template in the resulting gel could impact the Cu loading and the crystallization of the final Cu-SAPO-34. Preferably, hydrothermal treatment of the Cu-SAPO-34 catalyst with Cu loading ca. 3.44% at 750 degrees C for 16 h increased the NH3-SCR activity slightly due to migration of CuO to isolated Cu2+ and the maintenance of the crystallinity as well as the acidity. Moreover, the catalyst aged at 800 degrees C for 16 h maintained >90% NOx conversion from 225 to 400 degrees C, and the crystallinity, active Cu2+ species and acidity in Cu-SAPO-34 were not destroyed completely after such harsh treatment. Meanwhile, kinetic analysis over fresh and aged Cu-SAPO-34 samples were conducted and the conclusion were in agreement with the NH3-SCR tests, H-2-TPR and NH3-TPD results. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：254 / 263

页数：10

共 47 条

[1] Control of NOx emissions from diesel engine by selective catalytic reduction (SCR) with urea [J].