Potential for metal foams to act as structured catalyst supports in fixed-bed reactors
Potential for metal foams to act as structured catalyst supports in fixed-bed reactors
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DOI：
10.1016/j.cattod.2016.03.047
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发表时间：
2016-09-15
期刊：
影响因子：
5.3
通讯作者：
Kolvenbach, Robin
中科院分区：
文献类型：
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作者：
Kolaczkowski, Stan T.;Awdry, Serpil;Kolvenbach, Robin
通过实验，可以更好地理解流动通过结构金属泡沫（作为催化剂支撑）中的大型互连腔的好处。例如，使用片剂状（8mm x 8mm x 3mm）金属泡沫颗粒（1200针腔大小），在2米长的填充床（直径=71.7 mm，流量= 0.039 kg/s）的压降为0.5 bar时，发现通过泡沫颗粒的强制对流体流占总流量的38%，从而证明反应物可以轻松进入金属泡沫颗粒的内部腔室，从而进入催化剂层。在另一个例子中，它展示了金属泡沫结构如何在高温固定床应用中被利用（例如用于吸热反应）。实验在一个74 mm的柱中进行，其中包含不同形式的催化剂载体，固定床的深度为600 mm。为了表示工艺应用中的气体混合物，压缩空气（例如0.008 kg/s）被电预热（例如高达500摄氏度），然后被送入由电炉包围的固定床（例如管表面650-950摄氏度）。实验结果表明，根据不同的应用，金属泡沫结构可以：(a)作为连续结构完全填充沟道；(b)以催化剂泡沫颗粒的形式使用；(c)在管道段之间安装间隙，以利用辐射（从管道壁）进行传热。(C) 2016 Elsevier B.V.版权所有
Experiments were performed in which the benefits of flow through the large interconnecting cavities in structured metal foams (acting as catalyst supports) could be better understood. For example, using tablet shaped (8 mm x 8 mm x 3 mm) metal foam pellets (1200 pin cavity size), at a pressure drop of 0.5 bar across a 2m long packed bed (i.d.=71.7 mm, flow = 0.039 kg/s), the forced convective bulk flow through the foam pellets was found to represent 38% of the total flow, thereby demonstrating the ease with which reactants could access the internal cavities of the metal foam pellet and hence the catalyst layer.In another example it is shown how a metal foam structure could be exploited in a high temperature fixed bed application (e.g. for endothermic reactions). Experiments were performed in a 74 mm i.d. column, which contained different forms of catalyst supports, such that the depth of the fixed bed was 600 mm. To represent a gaseous mixture in a process application, compressed air (e.g. 0.008 kg/s) was electrically pre-heated (e.g. up to 500 degrees C), and then fed into the fixed-bed which was surrounded by an electrical furnace (e.g. tube surface 650-950 degrees C). From these experiments it was shown that, depending on the application, the metal foam structure could: (a) completely fill the channel as a continuous structure; (b) be used in the form of catalyst foam pellets; and (c) be installed with gaps between segments to exploit heat transfer by radiation (from the walls of the channel). (C) 2016 Elsevier B.V. All rights reserved.