Towards the scale up of a pressurized-jet microfluidic flow-through reactor for cost-effective electro-generation of H2O2

JOURNAL OF CLEANER PRODUCTION

卷:211

Article

Fernando Perez, Jose¹  Llanos, Javier¹  Saez, Cristina¹  Lopez, Conrado¹  Canzares, Pablo¹  Andres Rodrigo, Manuel¹ 

[1] Univ Castilla La Mancha, Chem Engn Dept, Fac Ciencias & Tecnol Quim, Edificio Enrique Costa Novella, E-13071 Ciudad Real, Spain

关键词: Hydrogen peroxide;    Jet;    Pressure;    Microfluidic;    Flow-through;    Cell design;   

DOI  :  10.1016/j.jclepro.2018.11.225

来源: Elsevier

【 摘 要 】

The performance of a novel pressurized-jet microfluidic flow-through electrolyzer for the production of aqueous solution of H2O2 is assessed in this work. The reactor design is based on three aspects i) minimizing ohmic drops, by reducing the interelectrode gap to 150 gm and the use of a Duocel aluminum foam as cathodic support; ii) maximizing mass transport, due to the use of three-dimensional electrodes fed in flow-through and optimizing the aeration system coupling a pressurized circuit and a jet aerator. Results show that H2O2 can be produced with an instantaneous current efficiency of = 100% up to 20 mA cm(-3) and a corresponding production rate of 13.1 mg H2O2 h(-1) cm(-3) in a cathode of 16.5 cm(-3). Low ohmic resistances were measured even in low-conductive electrolytes, as for example 6 Omega in 0.0035 M Na2SO4 (0.7 mS cm(-1)). The electrical energy consumption of 3.65 kWh kg H(2)o(2)(-1) at 10 mA cm-3 in 0.05 M Na2SO4 is the lowest reported so far in neutral-acid medium, confirming the costeffectiveness of the system. A preliminary scale-up by increasing the cathode volume three times (up to 49.5 cm(3)) allowed the production rate to be multiplied by the same factor and confirms that the system is scalable. Theoretical calculations suggest that the cathode could be expanded up to 3600 cm(3) (1 m thickness) under those aeration conditions (6 bar and 160 dm(3) h(-1) recirculation flow). (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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