Development and Optimization of an Immobilized Photocatalytic System within a Stacked Frame Photoreactor (SFPR) Using Light Distribution and Fluid Mixing Simulation Coupled with Experimental Validation,Industrial & Engineering Chemistry Research

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Development and Optimization of an Immobilized Photocatalytic System within a Stacked Frame Photoreactor (SFPR) Using Light Distribution and Fluid Mixing Simulation Coupled with Experimental Validation
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-02-13 , DOI: 10.1021/acs.iecr.8b05709
Con Boyle ₁ , Nathan Skillen ₁ , Lorenzo Stella _{1,

2} , Peter K. J. Robertson ₁

Affiliation

Recently, photocatalytic reactors have been designed with a view toward overcoming mass transfer limitations especially in systems with immobilized catalysts. This paper reports the design of a titanium “bladed” propeller with TiO₂ immobilized on the blades. To evaluate the propeller efficiency, modeling using COMSOL Multiphysics was validated experimentally using coumarin as a probe molecule allowing for OH radical quantification. Modeling of light distribution and catalyst irradiance at varying irradiation distance was performed using ray optics, which, alongside experimental work, showed that irradiation at 4 and 5 cm from the propeller yielded the highest irradiance (29.3 and 22.1 mW/cm²) and OH radical concentrations (5.38 and 5.56 μM, respectively). Propeller rotation was modeled and compared against experimental data to assess mass transfer limitations at varying rotation speeds. This showed that 300 rpm provided the highest rate of coumarin degradation (0.32 μM/min) despite the model showing higher fluid velocities at 400 rpm.

中文翻译：

利用光分布和流体混合模拟与实验验证相结合，开发和优化堆叠框架光反应器（SFPR）中固定化光催化系统

近来，已经设计了光催化反应器以克服传质限制，特别是在具有固定化催化剂的系统中。本文报道了钛“桨叶”螺旋桨的设计，该桨叶上固定了TiO ₂。为了评估螺旋桨效率，使用香豆素作为允许OH自由基定量的探针分子，对使用COMSOL Multiphysics进行的建模进行了实验验证。使用射线光学器件对在不同照射距离下的光分布和催化剂辐照度进行建模，该射线光学器件与实验工作一起显示，距螺旋桨4和5 cm处的辐照产生最高辐照度（29.3和22.1 mW / cm ^2））和OH自由基浓度（分别为5.38和5.56μM）。对螺旋桨旋转建模并与实验数据进行比较，以评估在不同旋转速度下的传质限制。这表明，尽管模型在400 rpm时显示出较高的流体速度，但300 rpm的香豆素降解率最高（0.32μM/ min）。

更新日期：2019-02-14

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