Parallelized microfluidic droplet generators with improved ladder-tree distributors for production of monodisperseγ-Al_(2)O_(3)microspheres  

作　　者：Huilin Yi Shuliang Lu Jiajia Wu Yujun Wang Guangsheng Luo 

机构地区：[1]State Key Lab of Chemical Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China [2]Sinopec Beijing Research Institute of Chemical Industry,Beijing 100000,China

出　　处：《Particuology》2022年第3期47-54,共8页颗粒学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(grant Nos.21878169 and 21991102);the National Key Research and Development Program of China(grant No.2019YFA0905100);the Tsinghua University Initiative Scientific Research Program(grant No.2018Z05JZY010).

摘　　要：In this paper,we present a parallelized microfluidic device with improved ladder-tree distributors for the scaled-up production of monodisperse microspheres.Owing to the improved distribution form comprising a ladder distributor in the center and tree distributors around the circumference,the uniformity of the generated droplets for our device was improved by 32.9%and 86.1%compared to those achieved in devices with conventional tree and ladder distributors,respectively,in the final production stage with 32 droplet generators,indicating the potential of our device for further scale-up while maintaining the monodispersity of the generated droplets.The effect of the 2D scale-up of our device was investigated by varying the continuous-phase flow rate and viscosity.Using our device,γ-Al_(2)O_(3)microspheres with a diameter of 598.1μm and a CV of 2.58%,as catalyst support for microreactors,were continuously synthesized at high production rate.The nickel-based catalyst prepared fromγ-Al_(2)O_(3)microspheres with large specific surface area and pore volume had an average NiO size of 14 nm,which was 60.9%of that supported on industrial support.The CO methanation conversion of the Ni@Al_(2)O_(3)microspheres was 1.7 times larger than Ni@Al_(2)O_(3)industrial support at 140℃.

关 键 词：Microfluidics Scale-up γ-Al_(2)O_(3)microspheres METHANATION 

分 类 号：O35[理学—流体力学]