Combustion synthesized nickel-cobalt catalyst deactivation by coking during ethanol decomposition reaction
Author | Kumar, Anand |
Author | Ashok, Anchu |
Author | Tarlochan, Faris |
Available date | 2022-09-15T07:07:59Z |
Publication Date | 2019 |
Publication Name | AIChE Annual Meeting, Conference Proceedings |
Resource | Scopus |
Abstract | In this work, we report the catalytic dehydrogenation of ethanol over porous cobalt oxide and nickel-cobalt bimetal oxide (NiCoO2). Catalyst deactivation and the nature of carbon formation on these two catalysts are studied in detail to correlate the active phase with carbon formation. In-situ FTIR analysis was conducted between 50°C to 400°C on Co3O4 and NiCoO2 catalysts to understand the reaction mechanism and product selectivity. Addition of Ni improves the activity for ethanol decomposition by achieving complete ethanol conversion at 350°C as compared to 420°C for cobalt alone. The crystallinity, morphology and particle analysis of the spent catalyst after reaction was identified using XRD, SEM and TEM respectively. The XRD shows a phase change of porous NiCoO2 to NiCo alloy, whereas SEM indicates the presence of fibrous structure on the surface with 91.7 % of carbon while keeping 1:1 ratio of Ni and Co after the reaction. The detailed analysis of carbon structure using HRTEM-STEM (Fig. 1) shows simultaneous growth of carbon nanofibers (CNFs) and multiwalled carbon nanotubes (MWCNTs) that were favored by larger and smaller crystallites respectively. |
Sponsor | This publication was made possible by NPRP grant (NPRP8-145-2-066) from the Qatar national research fund (a member of Qatar foundation).The statements made herein are solely the responsibility of the author(s). The authors also wish to acknowledge the technical services granted by Central Laboratory Unit (CLU) and Gas Processing Centre (GPC) at Qatar University. |
Language | en |
Publisher | American Institute of Chemical Engineers |
Subject | Ethanol decomposition Hydrogen production Nickel cobalt catalysts Solution combustion synthesis |
Type | Conference Paper |
Volume Number | 2019-November |
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