Efficient Propylene Carbonate Synthesis from Urea and Propylene Glycol over Calcium Oxide-Magnesium Oxide Catalysts

被引：3

作者：

Dang, Kavisha ^{[1
]}

Kumar, Navneet ^{[2
]}

Srivastava, Vimal Chandra ^{[1
]}

Park, Jinsub ^{[2
]}

Naushad, Mu. ^{[3
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Chem Engn, Roorkee 247667, India

[2] Hanyang Univ, Dept Elect Engn, Seoul 04763, South Korea

[3] King Saud Univ, Coll Sci, Dept Chem, POB 2455, Riyadh 11451, Saudi Arabia

来源：

MATERIALS | 2023年 / 16卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

cyclic carbonates; alcoholysis; propylene carbonate; propane-1; 2-diol; urea; DIMETHYL CARBONATE; 1,2-PROPYLENE GLYCOL; MIXED-OXIDE; AL; PERFORMANCE;

D O I：

10.3390/ma16020735

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of calcium oxide-magnesium oxide (CaO-MgO) catalysts were prepared under the effects of different precipitating agents and using varied Mg/Ca ratios. The physiochemical characteristics of the prepared catalysts were analyzed using XRD, FE-SEM, BET, FTIR, and TG/DTA techniques. Quantification of basic active sites present on the surface of the CaO-MgO catalysts was carried out using the Hammett indicator method. The as-prepared mixed oxide samples were tested for propylene carbonate (PC) synthesis through the alcoholysis of urea with propylene glycol (PG). The effects of the catalyst composition, catalyst dose, reaction temperature, and contact time on the PC yield and selectivity were investigated. The maximum PC yield of 96%, with high PC selectivity of 99% and a urea conversion rate of 96%, was attained at 160 degrees C using CaO-MgO catalysts prepared using a Mg/Ca ratio of 1 and Na2CO3 as a precipitating agent. The best-performing catalysts also exhibited good reusability without any significant loss in PC selectivity. It is expected that the present study will provide useful information on the suitability of different precipitating agents with respect to the catalytic properties of the oxides of Ca and Mg and their application in the synthesis of organic carbonates.

引用

页数：13

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