文献类型：期刊文献

英文题名：Anti-coking performance of Al/Si/Cr/Ce ceramic coating during naphtha steam cracking applied on Cr25Ni35Nb alloy

作者：Xiong, Honghui[1];Liu, Jinglei[1];Zhang, Yongjun[2];Wang, Hao[1];Sun, Enhao[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]China Natl Petr Corp Ltd, Daqing Chem Res Ctr, Daqing 163714, Heilongjiang, Peoples R China

年份：2023

卷号：194

起止页码：756

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20232514278841);WOS:【SCI-EXPANDED(收录号:WOS:001011421300001)】；

基金：Acknowledgements This work was supported by the China National Petroleum Corporation under grant number DQZX-KY-19-023 and DQZX-KY-22-029.

语种：英文

外文关键词：Naphtha cracking; Cr 25 Ni 35 Nb alloy; Pack cementation method; Al; Si; Cr; Ce coating; Coking behavior

摘要：To reduce the coke formation, a novel Al/Si/Cr/Ce composite ceramic coating was prepared on the surface of the Cr25Ni35Nb alloy substrate by pack cementation. The microstructure, phase composition, surface morphology and element distribution of substrate and coating were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results reveal that the outer layer of the coating forms a protective layer with a high proportion of AlN and Cr3Si and trace amounts of Ce. The inter-diffusion layer is mainly aluminide coating (AlNi and AlFe) and transition layer contains a small amount of AlN. The anti-coking performance of the coating was assessed using naphtha steam cracking. To study coking behavior, the morphology and microstructure of the coke layer were analyzed and characterized by SEM and Laser Micro-Raman Spectrometer. The coke layer on uncoated sample has a higher focal density and is more likely to spall and peel off when subjected to coking experiment. A large number of filamentous and granular cokes appear on the surface of the uncoated sample, whereas only less granular cokes appear on the surface of the coated sample, and the coke on the uncoated sample has a more disordered and amorphous carbon structure. The coating significantly inhibited the growth of filamentous coke and reduced coke accumulation.(c) 2023 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.