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Catalytic Behavior of Alkali Treated H-MOR in Selective Synthesis of Ethylenediamine via Condensation Amination of Monoethanolamine

1
School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China
2
State Key Laboratory of Fluorine & Nitrogen Chemical, Xi’an Modern Chemistry Research Institute, Xi’an 710065, China
3
College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(4), 386; https://doi.org/10.3390/catal10040386
Received: 6 March 2020 / Revised: 21 March 2020 / Accepted: 26 March 2020 / Published: 2 April 2020
Catalytic behavior of alkali treated mordenite (H-MOR) in selective synthesis of ethylenediamine (EDA) via condensation amination of monoethanolamine (MEA) was investigated. Changes in the structural and acidic properties of alkali treated H-MOR were systematically investigated by N2 adsorption/desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), temperature programmed ammonia desorption (NH3-TPD), pyridine adsorption was followed by infrared spectroscopy (Py-IR), and X-ray fluorescence (XRF) analyses. The results show that alkali treatment produces more opening mesopores on the H-MOR crystal surfaces and leads to an increase in the number of B acid sites and the strength of the acid sites. The mesopores effectively enhance the rate of diffusion in the bulk catalyst. Moreover, the B acid sites are active sites in selective synthesis of EDA. Due to improvements in the diffusion conditions and reactivities, alkali treated H-MOR shows an excellent catalytic performance under mild reaction conditions. The conversion of MEA was 52.8% and selectivity to EDA increased to 93.6%, which is the highest selectivity achieved so far. Furthermore, possible mechanism for the formation of EDA is discussed. View Full-Text
Keywords: alkali treated H-MOR; monoethanolamine; ethylenediamine; condensation amination; mechanism alkali treated H-MOR; monoethanolamine; ethylenediamine; condensation amination; mechanism
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Zhao, F.-W.; Zhang, Q.; Hui, F.; Yuan, J.; Mei, S.-N.; Yu, Q.-W.; Yang, J.-M.; Mao, W.; Liu, Z.-W.; Liu, Z.-T.; Lu, J. Catalytic Behavior of Alkali Treated H-MOR in Selective Synthesis of Ethylenediamine via Condensation Amination of Monoethanolamine. Catalysts 2020, 10, 386.

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