An efficient method for enhancing adhesion and uniformity of Al2O3 coatings on nickel micro-foam used in micropacked beds

doi:10.1016/j.cjche.2021.05.022

中国化学工程学报 ›› 2021, Vol. 39 ›› Issue (11): 162-172.DOI: 10.1016/j.cjche.2021.05.022

• Catalysis, Kinetics and Reaction Engineering • 上一篇下一篇

An efficient method for enhancing adhesion and uniformity of Al₂O₃ coatings on nickel micro-foam used in micropacked beds

Chi Ma, Le Sang, Xiaonan Duan, Jiabin Yin, Jisong Zhang

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2020-10-06 修回日期:2021-05-10 出版日期:2021-11-28 发布日期:2021-12-27
通讯作者: Jisong Zhang
基金资助:
We gratefully acknowledge the supports of National Key Research and Development Program of China (2019YFA0905100), and National Natural Science Foundation of China (21978146, 21991103, 22008138) on this work.

An efficient method for enhancing adhesion and uniformity of Al₂O₃ coatings on nickel micro-foam used in micropacked beds

Chi Ma, Le Sang, Xiaonan Duan, Jiabin Yin, Jisong Zhang

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2020-10-06 Revised:2021-05-10 Online:2021-11-28 Published:2021-12-27
Contact: Jisong Zhang
Supported by:
We gratefully acknowledge the supports of National Key Research and Development Program of China (2019YFA0905100), and National Natural Science Foundation of China (21978146, 21991103, 22008138) on this work.

摘要/Abstract

摘要： Methods of coating Al₂O₃ on nickel micro-foam were compared and screened, aiming to overcome the capillary force and prepare the micro-foam monolithic catalyst coatings. The surface of micro-foam substrate was pretreated by a chemical etching method to improve the adhesion of the coatings on the substrate. The results showed that the slurry circulation at 162 ml·min^-1 was evaluated as the optimal method. The pore size on the substrate surface can be controlled by changing the pretreatment conditions. An empirical correlation was also proposed, showing an excellent practicality for predicting the pore size. The adhesion of the coatings with substrate pretreatment was significantly better than that without substrate pretreatment. The minimum value of mass loss after ultrasonic vibration was 3.9%. This mainly attributes to the squeezing of Al₂O₃ particles in the pores of substrate surface. The coatings on nickel micro-foam are hopefully used in micropacked beds for catalytic reactions.

关键词: Foam, Alumina, Catalyst support, Substrate pretreatment, Adhesion mechanism, Micropacked bed

Abstract: Methods of coating Al₂O₃ on nickel micro-foam were compared and screened, aiming to overcome the capillary force and prepare the micro-foam monolithic catalyst coatings. The surface of micro-foam substrate was pretreated by a chemical etching method to improve the adhesion of the coatings on the substrate. The results showed that the slurry circulation at 162 ml·min^-1 was evaluated as the optimal method. The pore size on the substrate surface can be controlled by changing the pretreatment conditions. An empirical correlation was also proposed, showing an excellent practicality for predicting the pore size. The adhesion of the coatings with substrate pretreatment was significantly better than that without substrate pretreatment. The minimum value of mass loss after ultrasonic vibration was 3.9%. This mainly attributes to the squeezing of Al₂O₃ particles in the pores of substrate surface. The coatings on nickel micro-foam are hopefully used in micropacked beds for catalytic reactions.

Key words: Foam, Alumina, Catalyst support, Substrate pretreatment, Adhesion mechanism, Micropacked bed

Chi Ma, Le Sang, Xiaonan Duan, Jiabin Yin, Jisong Zhang. An efficient method for enhancing adhesion and uniformity of Al₂O₃ coatings on nickel micro-foam used in micropacked beds[J]. 中国化学工程学报, 2021, 39(11): 162-172.

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An efficient method for enhancing adhesion and uniformity of Al₂O₃ coatings on nickel micro-foam used in micropacked beds

An efficient method for enhancing adhesion and uniformity of Al₂O₃ coatings on nickel micro-foam used in micropacked beds

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