545037 Designing a Hierarchical Nanosheet ZSM-35 Zeolite to Realize More Efficient Ethanol Synthesis from Dimethyl Ether and Syngas

Thursday, June 6, 2019: 10:54 AM
Texas Ballroom EF (Grand Hyatt San Antonio)
Xiaobo Feng, Guohui Yang, Yoshiharu Yoneyama and Noritatsu Tsubaki, Department of Applied Chemistry, School of Engineering, University of Toyama, TOYAMA, Japan

Designing a hierarchical nanosheet ZSM-35 zeolite to realize more efficient ethanol synthesis from dimethyl ether and syngas

Xiaobo Feng, Guohui Yang, Yoshiharu Yoneyama, Noritatsu Tsubaki*

Department of Applied Chemistry, School of Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan

*Corresponding author: (+81)76-445-6848, tsubaki@eng.u-toyama.ac.jp

As a clean and alternative fuel, ethanol (EtOH) has attracted increasing attentions due to the shortages of fossil energy and worsening environment. In this work, a dual-catalyst bed reactor packed with the combination of hierarchical nanosheet HZSM-35 (Hi-NZ35) zeolite and CuZnAl catalyst was proposed to realize more efficient ethanol synthesis from dimethyl ether (DME) and syngas (CO+H2). The nanosheet ZSM-35 (NZ35) zeolite was synthesized using hydrothermal synthesis and the CuZnAl catalyst was prepared by co-precipitation method. Moreover, a series of Hi-NZ35x zeolites were obtained from NZ35 zeolite by further treatment with varied NaOH aqueous solution using hydrothermal process (“x” means the NaOH solution concentration of 0.2-0.6 M). It was found that Hi-NZ350.4 zeolite was more effective to obtain hierarchical porosity with mesopore volume up to 0.131 cm3 g-1. For single DME carbonylation reaction, the NZ35 zeolite exhibited superior catalytic activity (32.2%) and stability compared with conventional ZSM-35 (CZ35) zeolite. Furthermore, improved catalytic activity (42.0%) was observed on Hi-NZ350.4 zeolite owing to its abundant mesoporous structure. This result revealed that the hierarchical porosity of zeolite could effectively promote the catalytic performance of zeolite for DME carbonylation reaction. For the ethanol synthesis using the optimized catalysts combination of Hi-NZ350.4 zeolite and CuZnAl catalyst, the DME conversion was 47.2% and the ethanol productivity reached 840.2 mmol kg-1 h-1, much better than that of the combination of the CZ35 zeolite with CuZnAl catalyst. This new alternative ethanol synthetic approach from syngas and DME will reduce the dependence on petroleum resources and cut the emission of the greenhouse gas.


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