Direct synthesis of formic acid from carbon dioxide and hydrogen: A thermodynamic and experimental study using poly-urea encapsulated catalysts

被引：20
|
作者：
Kabra, Satish K. [1 ]
Turpeinen, Esa [2 ]
Huuhtanen, Mika [2 ]
Keiski, Riitta L. [2 ]
Yadav, Ganapati D. [1 ]
机构：
[1] Inst Chem Technol, Dept Chem Engn, Bombay 400019, Maharashtra, India
[2] Univ Oulu, Fac Technol, Environm & Chem Engn Res Grp, FI-90014 Oulu, Finland
来源：
CHEMICAL ENGINEERING JOURNAL | 2016年 / 285卷
基金：
芬兰科学院;
关键词：
Hydrogenation; Ionic liquid; Supercritical CO2; Encapsulated poly-urea catalyst; Ruthenium; METHANOL SYNTHESIS; RECYCLABLE CATALYST; 2-PHENYL ETHANOL; STYRENE OXIDE; PALLADIUM; FORMATE; CO2; DIHYDROXYLATION; MICROCAPSULES; BICARBONATE;
D O I：
10.1016/j.cej.2015.09.101
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The present work is concerned with direct hydrogenation of CO2 to formic acid which takes into account thermodynamic feasibility and experimental studies. Poly-urea encapsulated catalysts were explored and the effect of ionic liquids under supercritical conditions was examined. The monometallic and bimetallic catalysts were prepared, characterized, screened for the hydrogenation of CO2 and also compared with a commercially available poly-urea-Pd catalyst. The effect of reaction temperature, type of the catalyst, promoter, pressure and molar ratio of the feed (H-2/CO2) on the yield of formic acid has been studied and discussed in order to maximize the formation of formic acid. The highest yield of formic acid obtained in terms of turn-over frequency (TOF) was 11,900 h(-1) at a total pressure of 144 bar, temperature of 70 degrees C, mole ratio (H-2/CO2) of 1, catalyst (poly urea encapsulated Ru) loading of 0.04 g/cm(3) and 3.12 x 10(-5) mol/cm(3) of ionic liquid (trihexyl (tetradecyl) phosphonium chloride). C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：625 / 634
页数：10
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