Citation: XU Jing, WANG Sen, WANG Peng-fei, YAN Wen-fu, WEI Yu-wei, LI Jun-fen, DONG Mei, WANG Jian-guo, FAN Wei-bin. The effect of acid treatment on the structure of clinoptilolite[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(8): 1000-1008. shu

The effect of acid treatment on the structure of clinoptilolite

XU Jing ^1,2 ,
WANG Sen ¹ ,
WANG Peng-fei ¹ ,
YAN Wen-fu ³ ,
WEI Yu-wei ⁴ ,
LI Jun-fen ^1,, ,
DONG Mei ¹ ,
WANG Jian-guo ¹ ,
FAN Wei-bin ^1,,

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Jilin University, Changchun 130000, China
4.
Luoyang Janlong Micro-Nano New Materials CO., LTD., Luoyang 471000, China

Corresponding author: LI Jun-fen, lijunfen@sxicc.ac.cn FAN Wei-bin, fanwb@sxicc.ac.cn
Received Date: 30 March 2018
Revised Date: 14 May 2018

Fund Project: the National Natural Science Foundation of China 21273264National Basic Research Program of China 2011CB201400the National Natural Science Foundation of China 20143268the National Natural Science Foundation of China 21227002Natural Science Foundation Shanxi Province of China 2012011005-2The project was supported by the National Natural Science Foundation of China (21227002, 20143268, 21273264, 21273263), National Basic Research Program of China (973 program, 2011CB201400) and Natural Science Foundation Shanxi Province of China(2013021007-3, 2012011005-2)Natural Science Foundation Shanxi Province of China 2013021007-3the National Natural Science Foundation of China 21273263National Basic Research Program of China 973 program

Figures(7)

The influence of nitric acid treatment on the composition and structure of clinoptilolite (HEU) was analyzed by various characterization techniques, such as element analysis (ICP-AES), N₂ physical adsorption, X-ray powder diffraction (XRD), ²⁷Al/²⁹Si MAS NMR and DFT calculation.The Si/Al ratio and BET surface area of Na-K-HEU and NH₄-HEU were significantly increased after nitric acid treatment, and meanwhile, their relative crystallinity decreased to below 50% when the concentration of nitric acid reached 4 mol/L, illustrating the severe distortion of zeolite framework.However, the structure of H-HEU was more stable and it could maintain a high relative crystallinity of 94.8% even the concentration of nitric acid reached 6 mol/L.The results of ²⁷Al/²⁹Si MAS NMR indicated that some extra-framework aluminum species appeared in H-HEU and they could protect the framework aluminum from further distortion, whereas this protective effect did not exist on Na-K-HEU and NH₄-HEU, as they have little extra-framework aluminum species.It can be further proved that through back-exchanging the H-HEU to Na-HEU and K-HEU, their resistance to nitric acid treatment could be markedly improved.
- clinoptilolite,
- nitric acid treatment,
- dealumination,
- framework structure
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