Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs+-exchanged Y Zeolite

›› 2009, Vol. 17 ›› Issue (1): 58-63.

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Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs⁺-exchanged Y Zeolite

WEI Ruiping^1,2, GUO Maiping¹, WANG Jun¹

1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;
2. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China

Received:2008-01-16 Revised:2008-10-28 Online:2009-01-28 Published:2009-01-28
Supported by:
Supported by the National Natural Science Foundation of China (20476046);the “Qinglan” Project of Jiangsu Province for Young Researchers

Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs⁺-exchanged Y Zeolite

魏瑞平^1,2, 郭麦平¹, 王军¹

1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;
2. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China

通讯作者: WANG Jun, E-mail: junwang@njut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (20476046);the “Qinglan” Project of Jiangsu Province for Young Researchers

Abstract

Abstract: In order to solve the serious leaching problem of supported heteropoly acid catalysts in polar reaction media, 12-molybdophosphoric acid encapsulated in the supercage of Cs⁺-exchanged Y zeolite was prepared by the "ship in the bottle" synthesis.The influence of ion-exchange conditions and the synthesis parameters on the encapsulation of PMo₁₂ were investigated.The obtained solid sample was characterized by X-ray diffraction(XRD), ³¹P magic angle spin nuclear magnetic resonance(MAS NMR) and Fourier Transform Infrared Spectroscopy(FT-IR), and its catalytic activity in the esterification of acetic acid and n-butanol was tested.The ion-exchange time, concentration of aqueous Cs⁺ solution, pH value, and amount of Mo added in the synthesis mixture were revealed to influence the encapsulation very remarkably.Under the optimal conditions, 12-molybdophosphoric acid could be successfully encapsulated in the supercage of CsY zeolite, and the samples showed considerable catalytic activity and excellent reusability in the esterification reaction.

Key words: Y zeolite, 12-molybdophosphoric acid, ship in the bottle, esterification

摘要： In order to solve the serious leaching problem of supported heteropoly acid catalysts in polar reaction media,12-molybdophosphoric acid encapsulated in the supercage of Cs⁺-exchanged Y zeolite was prepared by the "ship in the bottle" synthesis.The influence of ion-exchange conditions and the synthesis parameters on the encapsulation of PMo₁₂ were investigated.The obtained solid sample was characterized by X-ray diffraction(XRD),³¹P magic angle spin nuclear magnetic resonance(MAS NMR) and Fourier Transform Infrared Spectroscopy(FT-IR),and its catalytic activity in the esterification of acetic acid and n-butanol was tested.The ion-exchange time,concentration of aqueous Cs⁺ solution,pH value,and amount of Mo added in the synthesis mixture were revealed to influence the encapsulation very remarkably.Under the optimal conditions,12-molybdophosphoric acid could be successfully encapsulated in the supercage of CsY zeolite,and the samples showed considerable catalytic activity and excellent reusability in the esterification reaction.

关键词: Y zeolite, 12-molybdophosphoric acid, ship in the bottle, esterification

WEI Ruiping, GUO Maiping, WANG Jun. Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs⁺-exchanged Y Zeolite[J]. , 2009, 17(1): 58-63.

魏瑞平, 郭麦平, 王军. Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs⁺-exchanged Y Zeolite[J]. , 2009, 17(1): 58-63.

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Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs⁺-exchanged Y Zeolite

Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs⁺-exchanged Y Zeolite

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