Synthesis of propylene carbonate from urea and 1,2-propylene glycol over MnO2/γ-Al2O3 catalyst modified by NaOH

DU Zhiping; LIN Zhikun; CHEN Fangsheng; HU Xingxing; DING Yigang; CHI Ru'an; WU Yuanxin

doi:10.3969/j.issn.0438-1157.2014.11.017

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Synthesis of propylene carbonate from urea and 1,2-propylene glycol over MnO₂/γ-Al₂O₃ catalyst modified by NaOH

更新时间：2025-12-10

- Synthesis of propylene carbonate from urea and 1,2-propylene glycol over MnO₂/γ-Al₂O₃ catalyst modified by NaOH
- CIESC Journal Issue 11, Pages: 4333-4339(2014)
- 作者机构：
  
  武汉工程大学绿色化工过程教育部重点实验室, 湖北省新型反应器与绿色化学工艺重点实验室,湖北,武汉,430074
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.11.017
  CLC： 63
- Online First：05 November 2014，
  
  Published：05 November 2014
- 稿件说明：
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DU Zhiping, LIN Zhikun, CHEN Fangsheng, et al. Synthesis of propylene carbonate from urea and 1,2-propylene glycol over MnO₂/γ-Al₂O₃ catalyst modified by NaOH[J]. CIESC Journal, 2014, (11): 4333-4339. DOI: 10.3969/j.issn.0438-1157.2014.11.017.
DOI：

DU Zhiping, LIN Zhikun, CHEN Fangsheng, et al. Synthesis of propylene carbonate from urea and 1,2-propylene glycol over MnO₂/γ-Al₂O₃ catalyst modified by NaOH[J]. CIESC Journal, 2014, (11): 4333-4339. DOI: 10.3969/j.issn.0438-1157.2014.11.017. DOI：

摘要

采用超声浸渍法制备了MnO2/γ-Al2O3催化剂

并用碱和盐对其进行了改性.采用X射线衍射仪(XRD)、CO2-TPD对改性后的MnO2/γ-Al2O3催化剂进行了表征

研究了改性后催化剂在尿素醇解合成碳酸丙烯酯(PC)反应中的催化性能.研究结果表明

NaOH改性MnO2/γ-Al2O3催化剂具有最好的催化性能;同时催化剂的焙烧时间、焙烧温度以及NaOH改性量影响催化剂表面碱性活性中心的数量和强度

其中中强碱的增加是改性后催化剂活性提高的主要原因.在NaOH用量为MnO2质量的10%

400℃焙烧2h后

改性MnO2/γ-Al2O3催化剂表面的中强碱量最大

催化活性最高

PC收率与选择性分别达86.9%、91.8%.

Abstract

MnO2/γ-Al2O3 catalyst was prepared by ultrasonic impregnation and modified by alkali or salt. The modified MnO2/γ-Al2O3 was characterized by X-ray diffraction (XRD)

temperature-programmed desorption of CO2(CO2-TPD). Catalytic performances were investigated in urea alcoholysis to propylene carbonate (PC). The activity of MnO2/γ-Al2O3 catalyst modified by NaOH was the best. At the same time

calcination temperature

calcination time and amount of NaOH affected the quantity and intensity of basic activity centers on the surface of the modified catalyst. The increase of moderately basic activity center was the main reason for the catalyst activity improvement after modification. When the MnO2/γ-Al2O3 catalyst was modified by 10% NaOH

and calcined at 400℃ for 2 h

the quantity of moderately basic activity center on the surface was the most

which led to the highest activity. Yield and selectivity of PC were up to 86.9% and 91.8%

respectively.

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