A comparative study on the dehydration of monoethanolamine over cesium phosphate modified zeolite catalysts

Sun, Yanhui; Yan, Haisheng; Liu, Dongxue; Zhao, Defeng

doi:10.1016/j.catcom.2007.09.021

Cited by 18 publications

(1 citation statement)

References 8 publications

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“…Ethylenimine (EI) is widely used as a fine chemical and a starting ingredient for synthesizing value-added chemicals such as dyes and pharmaceuticals. Gas-phase dehydration of monoethanolamine (MEA) over solid acid/base catalysts has been identified as an important approach for the industrial production of EI. − Contrary to the traditionally homogeneous processes by using liquid acid and/or base as catalysts, the gas-phase route characterizes by a higher efficiency and environmentally benign mode. However, as discussed in our previous work, the simultaneous presence of the highly reactive hydroxyl and amine groups in the MEA molecule makes the reaction network very complex over solid acid/base catalysts.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Catalytic Stability of Cs₂O–P₂O₅ over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

Huang,

Yang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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In this work, the gas-phase selective dehydration of monoethanolamine (MEA) to ethylenimine (EI) was studied by using cesium and phosphorus oxides (Cs 2 O−P 2 O 5 ) over acidactivated montmorillonite (Acid-MMT) as a catalyst, and key factors affecting the catalytic stability are focused by operating the reaction for a time on stream (TOS) of 100 h. By keeping a fixed content of Cs 2 O over the catalyst, the change of the P 2 O 5 /Cs 2 O molar ratio from 0.16 to 0.58 leads to significantly varied MEA conversion and EI selectivity. Importantly, a stable EI yield of about 60% for a TOS of 100 h is achieved over the optimal catalyst, with a P 2 O 5 /Cs 2 O molar ratio of 0.51. Physicochemical properties of fresh/spent catalysts were characterized by powder X-ray diffraction, X-ray fluorescence, N 2 adsorption−desorption isotherms, and temperature-programmed desorption of NH 3 and CO 2 . Moreover, properties of the coke deposited over the spent catalysts were explored by thermal analysis and X-ray photoelectron spectroscopy. Results disclose that the acidic/basic sites play a key role for catalyzing the conversion of MEA to different products, and the catalyst with a higher amount of acidic/basic sites exhibits a lower deactivation rate. Although stronger acidic/basic sites are not directly involved in producing the targeted EI product, they promote the side reactions related to the coke deposition. The heteroatom-containing coke is beneficial to improving the EI selectivity via preferentially poisoning the stronger acidic/basic sites, which inhibits the unwanted side reactions. Considering the abundance of the precursors and the simple procedure of catalyst preparation, Cs 2 O−P 2 O 5 /Acid-MMT is a promising catalyst for the large-scale production of EI via gas-phase MEA dehydration.

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Section: Introductionmentioning

confidence: 99%

Understanding the Catalytic Stability of Cs₂O–P₂O₅ over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

Huang,

Yang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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A study of thermal behavior of cesium phosphate

Zhang

Peng

2015

J Therm Anal Calorim

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TG/DTA and XRD study on structure and chemical transformation of the Cs–P–W oxides

Zhang

Peng

et al. 2016

J Therm Anal Calorim

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A comparative study on the dehydration of monoethanolamine over cesium phosphate modified zeolite catalysts

Cited by 18 publications

References 8 publications

Understanding the Catalytic Stability of Cs₂O–P₂O₅ over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

Understanding the Catalytic Stability of Cs₂O–P₂O₅ over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

A study of thermal behavior of cesium phosphate

TG/DTA and XRD study on structure and chemical transformation of the Cs–P–W oxides

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A comparative study on the dehydration of monoethanolamine over cesium phosphate modified zeolite catalysts

Cited by 18 publications

References 8 publications

Understanding the Catalytic Stability of Cs2O–P2O5 over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

Understanding the Catalytic Stability of Cs2O–P2O5 over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

A study of thermal behavior of cesium phosphate

TG/DTA and XRD study on structure and chemical transformation of the Cs–P–W oxides

Contact Info

Product

Resources

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Understanding the Catalytic Stability of Cs₂O–P₂O₅ over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine

Understanding the Catalytic Stability of Cs₂O–P₂O₅ over Acid-Activated Montmorillonite for the Gas-Phase Dehydration of Monoethanolamine to Ethylenimine