In Situ Delamination of Ferrierite Zeolite and its Performance in the Catalytic Cracking of C4 Hydrocarbons

doi:10.1016/j.cjche.2014.09.006

›› 2014, Vol. 22 ›› Issue (11/12): 1237-1242.DOI: 10.1016/j.cjche.2014.09.006

• CATALYSIS, KINETICS AND REACTION ENGINEERING • Previous Articles Next Articles

In Situ Delamination of Ferrierite Zeolite and its Performance in the Catalytic Cracking of C₄ Hydrocarbons

Ruili Pan¹, Miaojuan Jia², Yuping Li³, Xiaofeng Li², Tao Dou⁴

1 Institute of Chemical and Biological Technology, Taiyuan University of Science and Technology, Taiyuan 030021, China;
2 Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China;
3 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
4 CNPC Key Laboratory of Catalysis, College of Chemical Engineering, China University of Petroleum, Beijing 102249, China

Received:2013-08-26 Revised:2013-08-26 Online:2014-12-24 Published:2014-12-28
Supported by:
Supported by the NSFC of China (20973123), the National Basic Research Program of China (2012CB215002), the International Science and Technology Cooperative Program of China (2010DFB40440) and Shanxi Basic Research Projects (2012011005-7, 2012011008-3).

In Situ Delamination of Ferrierite Zeolite and its Performance in the Catalytic Cracking of C₄ Hydrocarbons

Ruili Pan¹, Miaojuan Jia², Yuping Li³, Xiaofeng Li², Tao Dou⁴

1 Institute of Chemical and Biological Technology, Taiyuan University of Science and Technology, Taiyuan 030021, China;
2 Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China;
3 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
4 CNPC Key Laboratory of Catalysis, College of Chemical Engineering, China University of Petroleum, Beijing 102249, China

通讯作者: Tao Dou
基金资助:
Supported by the NSFC of China (20973123), the National Basic Research Program of China (2012CB215002), the International Science and Technology Cooperative Program of China (2010DFB40440) and Shanxi Basic Research Projects (2012011005-7, 2012011008-3).

Abstract

Abstract: Ferrierite (FER) zeolites were synthesized by solid transformation at different alkalinities (OH^-/Al₂O₃ molar ratios). The in situ delamination of FER zeolites were achieved and their catalytic performances in the catalytic cracking of C₄ hydrocarbons were examined. The relationships among the OH^-/Al₂O₃ molar ratio, FER structure, composition, surface acidity and catalytic performance in C₄ hydrocarbon crackingwere investigated. The results of X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electronmicroscopy, inductively coupled plasma atomic emission spectroscopy, N₂ adsorption, NH₃ temperature-programmed desorption and catalytic cracking showed that with increasing OH^-/Al₂O₃ molar ratio in the synthesis gel, the SiO₂/Al₂O₃ molar ratio of the as-synthesized FER zeolite decreased, the amount of acid sites in the corresponding H-FER increased, and the acid strengthweakened. Additionally, the FER zeolitewas delaminated at themesoscale. H-FER5 synthesized at the highest alkalinity had the largest number of acid sites and exhibited the highest catalytic activity in C₄ hydrocarbon catalytic cracking among three of the prepared catalysts. H-FER3 synthesized at the secondhighest alkalinity showed that the highest yield of benzene and toluene because of the secondary pores resulted from the gaps between the layers, which were beneficial to the diffusion and formation of large molecules.

Key words: Ferrierite, Zeolite, Catalyst, Delamination, C₄ hydrocarbon

摘要： Ferrierite (FER) zeolites were synthesized by solid transformation at different alkalinities (OH^-/Al₂O₃ molar ratios). The in situ delamination of FER zeolites were achieved and their catalytic performances in the catalytic cracking of C₄ hydrocarbons were examined. The relationships among the OH^-/Al₂O₃ molar ratio, FER structure, composition, surface acidity and catalytic performance in C₄ hydrocarbon crackingwere investigated. The results of X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electronmicroscopy, inductively coupled plasma atomic emission spectroscopy, N₂ adsorption, NH₃ temperature-programmed desorption and catalytic cracking showed that with increasing OH^-/Al₂O₃ molar ratio in the synthesis gel, the SiO₂/Al₂O₃ molar ratio of the as-synthesized FER zeolite decreased, the amount of acid sites in the corresponding H-FER increased, and the acid strengthweakened. Additionally, the FER zeolitewas delaminated at themesoscale. H-FER5 synthesized at the highest alkalinity had the largest number of acid sites and exhibited the highest catalytic activity in C₄ hydrocarbon catalytic cracking among three of the prepared catalysts. H-FER3 synthesized at the secondhighest alkalinity showed that the highest yield of benzene and toluene because of the secondary pores resulted from the gaps between the layers, which were beneficial to the diffusion and formation of large molecules.

关键词: Ferrierite, Zeolite, Catalyst, Delamination, C₄ hydrocarbon

Ruili Pan, Miaojuan Jia, Yuping Li, Xiaofeng Li, Tao Dou. In Situ Delamination of Ferrierite Zeolite and its Performance in the Catalytic Cracking of C₄ Hydrocarbons[J]. , 2014, 22(11/12): 1237-1242.

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In Situ Delamination of Ferrierite Zeolite and its Performance in the Catalytic Cracking of C₄ Hydrocarbons

In Situ Delamination of Ferrierite Zeolite and its Performance in the Catalytic Cracking of C₄ Hydrocarbons

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