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首页> 外文期刊>Catalysis Today >Scaling-up of slurry reactors for the photocatalytic oxidation of cyanide with TiO2 and silica-supported TiO2 suspensions
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Scaling-up of slurry reactors for the photocatalytic oxidation of cyanide with TiO2 and silica-supported TiO2 suspensions

机译：淤浆反应器的规模扩大，用TiO2和二氧化硅负载的TiO2悬浮液进行氰化物的光催化氧化

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摘要

A scaling-up methodology for the design of large-scale slurry reactors for the photocatalytic oxidation of cyanide is proposed. The only experimental information required to be determined at laboratory-scale is the intrinsic kinetics that describes the explicit dependence of the reaction rate with the local volumetric rate of photon absorption (LVRPA). Based on the kinetic model and the information about the geometry, irradiation source and the cyanide and catalyst concentrations as operation conditions, the performance of a larger scale reactor has been simulated following a predictive procedure with no adjustable parameters. The validation of the method has been carried out in a bench-scale reactor with ten times higher irradiated volume and a different geometry and irradiation source, in order to ensure that the conclusions about the applicability of the scaling-up model are independent of these parameters. The proposed scaling-up methodology and their correspondent procedures for the evaluation of the LVRPA distribution on the photoreactors has been successfully validated both with commercial TiO2 and a silica-supported TiO2 synthesized in our laboratory. The normalized root mean square error in the verification of the conversions predicted by the model for the larger scale reactor when compared with the experimental data are 7.7% and 6.2% for TiO2 and TiO2/SiO2, respectively.
机译：提出了按比例放大的方法设计用于氰化物光催化氧化的大型浆料反应器。需要在实验室规模确定的唯一实验信息是内在动力学，其描述了反应速率与光子吸收局部体积速率（LVRPA）的显着相关性。基于动力学模型和有关几何形状，辐射源以及氰化物和催化剂浓度作为操作条件的信息，按照无可调整参数的预测程序对大型反应器的性能进行了模拟。该方法的验证已在台式规模的反应器中进行，该反应器的辐照量高十倍，并且几何形状和辐照源不同，以确保有关放大模型适用性的结论与这些参数无关。所提出的按比例放大方法及其在光反应器上评估LVRPA分布的相应程序已通过商业TiO2和在我们实验室中合成的二氧化硅负载的TiO2进行了成功验证。与实验数据相比，该模型预测的大型反应器转化率的归一化均方根误差为TiO2和TiO2 / SiO2分别为7.7％和6.2％。

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