Quasi- operando quantification of Cu(II) ions in Cu-SSZ-13 catalyst by an NH3 temperature-programmed reduction method

Yue Ma; Xiaodong Wu; Jiancai Ding; Liping Liu; Baofang Jin; Eric D Walter; Rui Ran; Zhichun Si; Feng Gao; Duan Weng

doi:10.1039/d0cc07346f

Quasi- operando quantification of Cu(II) ions in Cu-SSZ-13 catalyst by an NH₃ temperature-programmed reduction method

Chem Commun (Camb). 2021 Feb 23;57(15):1891-1894. doi: 10.1039/d0cc07346f.

Authors

Yue Ma¹, Xiaodong Wu², Jiancai Ding², Liping Liu², Baofang Jin², Eric D Walter³, Rui Ran², Zhichun Si⁴, Feng Gao⁵, Duan Weng⁶

Affiliations

¹ The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. wuxiaodong@tsinghua.edu.cn duanweng@tsinghua.edu.cn and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA 99354, USA. feng.gao@pnnl.gov.
² The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. wuxiaodong@tsinghua.edu.cn duanweng@tsinghua.edu.cn.
³ Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, WA 99354, USA.
⁴ Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
⁵ Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA 99354, USA. feng.gao@pnnl.gov.
⁶ The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. wuxiaodong@tsinghua.edu.cn duanweng@tsinghua.edu.cn and Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.

PMID: 33491687
DOI: 10.1039/d0cc07346f

Abstract

A quasi-operando NH3 temperature-programmed reduction method (NH3-TPR), with N2:Cu = 1:1, is developed to quantify total Cu(ii) ions in Cu-SSZ-13 quenched from SCR-relevant reactions, and its accuracy is confirmed by in situ EPR. [Cu(OH)]+-Z and Cu2+-2Z can be further distinguished by NH3 reduction temperatures, and their different reducibility in SCR is revealed.