From bench scale to pilot plant: A 150x scaled-up configuration of a microwave-driven structured reactor for methane dehydroaromatization

催化作用 甲烷 脱氢 中试装置 化学工程 化学 微波食品加热 缩放比例 沸石 烷烃 材料科学 工艺工程 有机化学 计算机科学 工程类 电信 数学 几何学
作者
Ignacio Julián,Christoffer Mølleskov Pedersen,A.B. Jensen,Ane K. Baden,José L. Hueso,Anders V. Friderichsen,Henrik Birkedal,Reyes Mallada,Jesús Santamarı́a
出处
期刊:Catalysis Today [Elsevier BV]
卷期号:383: 21-30 被引量:30
标识
DOI:10.1016/j.cattod.2021.04.013
摘要

Microwave-assisted gas-phase conversion on structured catalysts is emerging as a promising process intensification technology in the field of heterogeneous catalysis. The combination of selective heating and structured catalytic materials induces a temperature difference between the heated catalytic sample and the surrounding void regions to avoid non-selective gas-phase reactions. This operational principle allowed inhibiting thermal cracking in alkane dehydrogenation processes as well as retarding catalyst deactivation by coking in methane dehydroaromatization (MDA) processes. However, its effectiveness has not been reported so far out of the laboratory scale conditions. This work addresses the scaling of the microwave-assisted MDA process from lab scale experiments to a scaled-up configuration capable of stable operation with a 150-fold higher feeding rate. The scaling-up potential and main obstacles to overcome for this technology are critically discussed. In addition, a techno-economic assessment of the MW-MDA process is presented. The catalytic activity was kept for seven consecutive reaction cycles, i.e. 35 h MW-MDA, prior to a progressive decay due to permanent deactivation caused by zeolite dealumination and active metal loss. The scaled set-up operated for up to 295 consecutive hours under unmanned operation conducting 4 -h MDA-regeneration cycles on Mo/[email protected] monoliths and resulting in 125-fold increase of converted methane and a 450-fold increase of benzene (0.17 LC6H6/h) in comparison with the laboratory scale tests. Scaled set-up experiments were run using only a 6-fold microwave input power, thus, highlighting the non-linearity between energy consumption and scaling factor for this technology and the importance of microwave cavity design.
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