Parallelized microfluidic droplet generators with improved ladder-tree distributors for production of monodisperseγ-Al_(2)O_(3)microspheres
作者机构：State Key Lab of Chemical EngineeringDepartment of Chemical EngineeringTsinghua UniversityBeijing 100084China Sinopec Beijing Research Institute of Chemical IndustryBeijing 100000China
出 版 物：《Particuology》 (颗粒学报（英文版）)
年 卷 期：2022年第20卷第3期
页 面：47-54页
核心收录：
学科分类：08[工学] 080103[工学-流体力学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0801[工学-力学（可授工学、理学学位）]
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).
主 题：Microfluidics Scale-up γ-Al_(2)O_(3)microspheres Methanation
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℃.
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