TY - JOUR
T1 - Cadmium Modified HZSM-5
T2 - A Highly Efficient Catalyst for Selective Transformation of Methanol to Aromatics
AU - Zhang, Yongkun
AU - Qu, Yixin
AU - Wang, Deliang
AU - Zeng, Xiao Cheng
AU - Wang, Jidong
N1 - Funding Information:
X.C.Z. is supported by a fund from Beijing Advanced Innovation Center for Soft Matter Science & Engineering for summer visiting scholar.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/11/8
Y1 - 2017/11/8
N2 - Cadmium modified HZSM-5 catalyst (Cd/ZSM-5) prepared by incipient wetness impregnation shows markedly high selectivity of aromatics and low selectivity of light alkanes and C5-C9 nonaromatics in the methanol-to-aromatics (MTA) transformation. The majority of the introduced Cd cations can exchange with protons of the bridged hydroxyl groups of HZSM-5, leading to a reduced number of Brønsted acid sites while generating new Lewis acid sites on the catalysts. The selectivity of aromatics with the Cd/ZSM-5 is found to be linearly correlated with the concentration of the strong Lewis acid sites. Compared to Zn/ZSM-5, the most extensively investigated catalyst thus far for the MTA, Cd/ZSM-5 is found to be more effective in promoting the aromatics formation. The different catalytic behavior observed for Cd/ZSM-5 and Zn/ZSM-5 catalysts is most likely due to the difference in ionic radius of Cd and Zn.
AB - Cadmium modified HZSM-5 catalyst (Cd/ZSM-5) prepared by incipient wetness impregnation shows markedly high selectivity of aromatics and low selectivity of light alkanes and C5-C9 nonaromatics in the methanol-to-aromatics (MTA) transformation. The majority of the introduced Cd cations can exchange with protons of the bridged hydroxyl groups of HZSM-5, leading to a reduced number of Brønsted acid sites while generating new Lewis acid sites on the catalysts. The selectivity of aromatics with the Cd/ZSM-5 is found to be linearly correlated with the concentration of the strong Lewis acid sites. Compared to Zn/ZSM-5, the most extensively investigated catalyst thus far for the MTA, Cd/ZSM-5 is found to be more effective in promoting the aromatics formation. The different catalytic behavior observed for Cd/ZSM-5 and Zn/ZSM-5 catalysts is most likely due to the difference in ionic radius of Cd and Zn.
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U2 - 10.1021/acs.iecr.7b02908
DO - 10.1021/acs.iecr.7b02908
M3 - Article
AN - SCOPUS:85033478308
SN - 0888-5885
VL - 56
SP - 12508
EP - 12519
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 44
ER -