Studies on Acidity of HZSM-5 Modified by Si(CH3)3Cl and Its Catalytic Behaviour in n-Hexane Aromatization

Abstract

Abstract: The surface properties of HZSM-5 zeolite modified by Si(CH₃)₃Cl were studied by TPD,IR,²⁷A1 MAS NMR.Catalytic reaction of n-hexane aromatization was investigated by continuous-reaction.The coke of catalysts was measured by DSC.It was found that the concentration of the strong Bronsted acid sites decreased and that of the stronger Lewis acid sites increased after modification by Si(CH₃)₃Cl.The TPDpeaks of NH₃,which were presumally attributed to the stronger acid sites,were decreased by the deposition of Si(CH₃)₃Cl on the surface of the zeolite.The conversion of n-hexane and selectivities of aromatic compounds were controlled by changing the concentration of the stronger acid sites.But aromatic compounds distribution can be attained by controlling the pore opening and channel of the zeolite.

Key words: n-Hexane, Acidity, Aromatization, Coke

TrendMD:

JIAO Qing-Zhe, JIANG Da-Zhen, ZHENG Wei-Min . Studies on Acidity of HZSM-5 Modified by Si(CH₃)₃Cl and Its Catalytic Behaviour in n-Hexane Aromatization[J]. Chem. J. Chinese Universities, 1992, 13(12): 1603.

[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]	TENG Yunyang, QU Zexing, ZHOU Zhongjun, HUANG Xuri. Theoretical Study on Photoinduced Stepwise Dearomatization of Benzenoid Arenes with Different States [J]. Chem. J. Chinese Universities, 2021, 42(3): 752.
[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]	ZHU Min, ZHANG Xiao, YOU Shuli. Visible-light-promoted Dearomatization of Benzene and Derivatives^† [J]. Chem. J. Chinese Universities, 2020, 41(7): 1407.
[7]	ZHAO Xingling, QI Guodong, WANG Qiang, CHU Yueying, GAO Wei, LI Shenhui, XU Jun, DENG Feng. Structure， Nature and Activity of Ga Species for Propane Aromatization in Ga/ZSM-5 Revealed by Solid-state NMR Spectroscopy [J]. Chem. J. Chinese Universities, 2020, 41(12): 2681.
[8]	HUI Longfei,LI Jianguo,GONG Ting,SUN Daoan,LÜ Jian,HU Shenlin,FENG Hao. Fabrication of Silica and Titania Anti-coking Passivation Layers in High Aspect-ratio Tubular Reactors by Atomic Layer Deposition^† [J]. Chem. J. Chinese Universities, 2019, 40(2): 201.
[9]	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.
[10]	ZHANG Ruizhen, WEN Shaobo, XING Pu, ZHAO Xin, WANG Zhixiang, HAN Peide, ZHAO Liangfu. Preparation and Characterization of HZSM-5/SAPO-11 Composite Molecular Sieves and Their Catalytic Properties in Isobutane Aromatization^† [J]. Chem. J. Chinese Universities, 2017, 38(1): 126.
[11]	LIU Ning, WANG Jiqiong, CHEN Biaohua, LI Yingxia, ZHANG Runduo. Study of Eight Membered Ring Zeolitic Catalyst of Cu/SAPO-35 over NH₃-SCR^† [J]. Chem. J. Chinese Universities, 2016, 37(10): 1817.
[12]	ZHANG Ruizhen, WANG Cui, XING Pu, WEN Shaobo, WANG Jian, ZHAO Liangfu, LI Yuping. Preparation of Hierarchical Porous HZSM-5 and Its Application in Light Paraffin Aromatization^† [J]. Chem. J. Chinese Universities, 2015, 36(4): 725.
[13]	WAN Hai, ZHANG Xiaoyu, ZHANG Ruojie, ZHANG Xiaotong, SONG Lijuan. Synthesis of High Performance ZSM-5-L Composite Zeolite and Its Catalytic Properities for n-Pentane Aromatization^† [J]. Chem. J. Chinese Universities, 2014, 35(10): 2220.
[14]	ZHANG Jian-Cheng, DING Jian-Xun, XIAO Chun-Sheng, HE Chao-Liang, ZHUANG Xiu-Li, YANG Ya-Nan, CHEN Xue-Si. Synthesis and Characterization of Tumor-acidity-sensitive Poly(L-lysine)-doxorubicin Conjugates [J]. Chem. J. Chinese Universities, 2012, 33(12): 2809.
[15]	WANG Tao, WU Guang-Jun, LI Lan-Dong*, GUAN Nai-Jia. Preparation, Characterization and Basic Catalytic Properties of Nitrogen-incorporated FAU Zeolites [J]. Chem. J. Chinese Universities, 2011, 32(3): 743.

Studies on Acidity of HZSM-5 Modified by Si(CH₃)₃Cl and Its Catalytic Behaviour in n-Hexane Aromatization

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments