Comparison of wall-coated and packed-bed reactors for steam reforming of methanol
Comparison of wall-coated and packed-bed reactors for steam reforming of methanol
复制标题
DOI：
10.1016/j.cattod.2005.09.010
复制
发表时间：
2005-12-15
期刊：
影响因子：
5.3
通讯作者：
Datye, A
中科院分区：
文献类型：
--
作者：
Karim, A;Bravo, J;Datye, A
通过实验比较了填充床和壁涂层微反应器中商业 CuO/ZnO/Al2O3 催化剂上甲醇蒸汽重整的动力学。测试了两种反应器配置的不同尺寸，并使用二维反应器模型分析了传输限制。填充床反应器的内径尺寸从 4.1 到 1 mm研究发现，传热受到限制，床层中可能存在高达 40 K 的温度梯度。消除温度梯度所需的反应器直径估计为300μm，这显然不切实际。另一方面，发现壁涂层反应器的内径从 4.1 毫米到 200 微米的尺寸不受任何质量或传热限制。我们的建模结果表明，对于相同的反应器直径，反应器的体积生产率随着催化剂壁涂层的增加而增加。我们还表明，与填充床微反应器相比，壁涂层反应器提供了更好的解决方案，可以实现低压降和高催化剂活性。 (c) 2005 Elsevier B.V. 保留所有权利。
The kinetics of methanol steam reforming on a commercial CuO/ZnO/Al2O3 catalyst in packed-bed and wall-coated microreactors were compared experimentally. Different dimensions of both reactor configurations were tested and the transport limitations were analyzed using 2D reactor models. Packed-bed reactors of dimensions from 4.1 down to I mm i.d. were found to be heat transfer limited and temperature gradients of up to 40 K could exist in the bed. The reactor diameter required to eliminate temperature gradients was estimated to be 300 mu m, which clearly is not practical. On the other hand, the wall-coated reactor was found to be free from any mass or heat transfer limitations in dimensions from 4.1 mm down to 200 mu m i.d. Our modeling results showed that the reactor volumetric productivity increases with thicker catalyst wall-coatings for the same reactor diameter. We also show that the wall-coated reactor offers a better solution to achieve low pressure drop and high catalyst activity compared to a packed-bed microreactor. (c) 2005 Elsevier B.V. All rights reserved.