Isomorphous Substitution of Zeolitic Framework (Ⅱ)—— Dealumination and Silicon Insertion for Zeolites in an Aqueous Solution of NH4BF4

Abstract

Abstract: Dealumination and silicon insertion of zeolites (Y, ZSM-5 and Beta) in an aqueous solution of NH₄BF₄ were investigated. The products were characterized by using various techniques such as XRD, IR, NMR, TPDand XRF. It is demonstrated that dealumination and silicon insertion occur definitely during this treatment. The Si/Al ratio is increased and the acidity is decreased with increasing the concentration of NH₄BF₄ used. In this process substitution of B for the framework elements does not occur and the process is proven to be a useful method for monitoring the Si and Al siting in the zeolites.

Key words: NH₄BF₄, Dealumination-silicon insertion, Thermal stability, Acidity

TrendMD:

Liu Xinsheng, Xu Ruren, Ding Hong, Zhang Yanqiu, Liu Ziyang . Isomorphous Substitution of Zeolitic Framework (Ⅱ)—— Dealumination and Silicon Insertion for Zeolites in an Aqueous Solution of NH₄BF₄[J]. Chem. J. Chinese Universities, 1990, 11(11): 1180.

[1]	LI Zhiguang, QI Guodong, XU Jun, DENG Feng. Role of Catalyst Acidity in Glucose Conversion over Sn-Al-β Zeolite as Studied by Solid-state NMR [J]. Chem. J. Chinese Universities, 2022, 43(6): 20220138.
[2]	CHANG Sihui, CHEN Tao, ZHAO Liming, QIU Yongjun. Thermal Degradation Mechanism of Bio-based Polybutylactam Plasticized by Ionic Liquids [J]. Chem. J. Chinese Universities, 2022, 43(11): 20220353.
[3]	WU Shuaini, ZHU Pengfei, SHI Huaiqi, LI Na, HU Zhaoxia, CHEN Shouwen. Preparation of CoCr_x/SAPO-34 Catalyst and Its Catalytic Combustion Performance for 1，2-Dichloroethane [J]. Chem. J. Chinese Universities, 2021, 42(12): 3731.
[4]	ZHAO Shufang, HUANG Jun. Study by Solid-state NMR Spectroscopy on the Acidity and Shape-selectivity of Zeolites [J]. Chem. J. Chinese Universities, 2021, 42(1): 165.
[5]	ZHANG Guoqiang, SUN Yuchen, SHI Yabo, ZHENG Huayan, LI Zhong, SHANGGUAN Ju, LIU Shoujun, SHI Pengzheng. Surface Properties of Ce_1-_xMn_xO₂ Catalyst on the Catalytic Activities for Direct Synthesis of DMC from CO₂ and Methanol [J]. Chem. J. Chinese Universities, 2020, 41(9): 2061.
[6]	ZHANG Jun, WANG Bin, PAN Li, MA Zhe, LI Yuesheng. Synthesis and Properties of Imidazolium-based Polyethylene Ionomer [J]. Chem. J. Chinese Universities, 2020, 41(9): 2070.
[7]	RAN Shiya,SHEN Haifeng,LI Xiaonan,WANG Zilu,GUO Zhenghong,FANG Zhengping. Effect and Mechanism of Rare Earth Trifluoromethanesulfonate on the Thermal Stability of Polypropylene^† [J]. Chem. J. Chinese Universities, 2019, 40(6): 1333.
[8]	FANG Xijie,LIU Ruiyun,LIN Sen,SHI Lei,WANG Runwei,LI Yi,LI Junying. Synthesis of STW-zeotype Germanosilicate via Steam-assisted Crystallization^† [J]. Chem. J. Chinese Universities, 2019, 40(5): 867.
[9]	YIN Mengxin,LIU Dongsheng,ZHAO Dongyue,DING Tong,TIAN Ye,LI Xingang. Effect of Copper Doping on Lean NO_x Trap Performance of Pt/Ba/Cu_xMg_1-_xAl₂O₄ Catalysts at High Temperatures ^† [J]. Chem. J. Chinese Universities, 2019, 40(10): 2170.
[10]	LIU Yi, XU Xiaozhou, MO Song, ZHAI Lei, HE Minhui, FAN Lin. Thermal Stability of Polyimide Resins Containing Siloxane Structure and Their High Temperature Structural Evolution [J]. Chem. J. Chinese Universities, 2019, 40(1): 187.
[11]	MENG Jiafeng, NI Xufeng, ZHENG Hao, SHEN Zhiquan. Copolymerization of Norbornene and 1-Octene Catalyzed by Bis(phenoxy-imine) Titanium Complex^† [J]. Chem. J. Chinese Universities, 2018, 39(8): 1853.
[12]	DU Shanshan, LI Yang, GUO Lei, LI Pengyu, CHAI Zhilong, WANG Tao, QUAN Dongqin, HE Junlin. Modification of Aptamer TBA with Extra Functional Groups and the Biological Activities^† [J]. Chem. J. Chinese Universities, 2018, 39(11): 2445.
[13]	LI Yang, LI Zhiwen, ZHU Junfei, LIU Shihui, HE Junlin. Construction of Pyrenyl Pairs in dsDNA: Fluorescent Properties of Multiple Pyrenyl-attached dsDNAs Through 7-Substituted 8-Aza-7-deaza-2'-deoxyadenosine Analogues^† [J]. Chem. J. Chinese Universities, 2018, 39(10): 2206.
[14]	LI Caixin, LIANG Xiaorong, GU Ju. Preparation and Characterization of Bagasse Nanocellulose^† [J]. Chem. J. Chinese Universities, 2017, 38(7): 1286.
[15]	CHEN Wenya, ZHU Li, HE Jun, XIE Yunlong, LU Jiqing, LUO Mengfei. Preparation of Rh/Al₂O₃-Cr₂O₃ Monolithic Catalysts for Dichloromethane Combustion^† [J]. Chem. J. Chinese Universities, 2017, 38(4): 606.

Isomorphous Substitution of Zeolitic Framework (Ⅱ)—— Dealumination and Silicon Insertion for Zeolites in an Aqueous Solution of NH₄BF₄

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments