Journal
MATERIALS & DESIGN
Volume 219, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2022.110744
Keywords
3D printing; Structured catalyst; Mass transfer; Mechanical strength
Categories
Funding
- National Engineering Research Center for Petroleum Refining Technology and Catalyst (RIPP, SINOPEC) [33600000-20-ZC0607-0011]
- National Natural Science Foundation of China [51975496]
- Xiamen Youth Innovation Fund Project [3502Z20206035]
- Foreign cooperation project of Fujian Provincial Department of science and technology [2021I0004]
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A combined-structure catalyst was fabricated using 3D printing technology to enhance the mass-transfer performance and mechanical strength in xylene isomerization reaction.
Para-xylene (PX) is an important material for the production of polyester fibers and resins; it is widely used in fuel and medical fields. To alleviate the low strength and unsatisfactory mass-transfer performance of conventional catalysts during xylene isomerization, a combined-structure catalyst is fabricated using three-dimensional (3D) printing technology. In this study, a catalyst ink formulation and preparation method suitable for 3D printing is designed, and a wet ball-milling process is adopted to improve the stability of the ink during 3D printing. The mass-transfer performance of the structured catalysts are investigated via computational fluid dynamics simulation; thus, combined-structure catalysts with high diffusivity and high specific surface area are realized. Compressive strength tests and xylene isomerization reaction experiments are conducted on the three-dimensionally printed catalysts and extrudates. Compared with the extrudates, the three-dimensionally printed catalyst exhibits higher mechanical strength and better catalytic performance. Among the structured catalysts, the combined linear-staggered/wave-vertical (LS/WV) catalyst demonstrates the best overall performance with a PX concentration in xylene of 22.89% and a high ethylbenzene conversion of 36.70%, which is approximately 21.68% higher than the extrudates. (C) 2022 The Authors. Published by Elsevier Ltd.
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