Current Science

Open Access Open Access  Restricted Access Subscription Access

Effect of Copper on Calcium-Modified Alumina-Supported Cobalt Catalysts towards Fischer-Tropsch Synthesis


Affiliations
1 Liquid Fuels Section, Central Institute of Mining and Fuels Research (DC), Dhanbad 828 108, India
2 Applied Chemistry Department, Indian School of Mines, Dhanbad 828 108, India
3 Institute de Rechereches sur la Catalyse et l’Environnement de Lyon, UMR 5256, CNRS/Universite Lyonl, France
 

The present study reports the possibility of using copper as a low-cost reduction promoter in cobaltbased Fischer-Tropsch (FT) catalysts. Adsorption behaviour of CO and H2 on alumina-supported Co and Co-Cu catalysts has been examined. Amount of CO and H2 desorption and temperature of desorption are used to gain insights about the performance of the catalysts. Presence of Cu alters CO and H2 adsorption on Co-alumina catalyst. Modification of alumina with Ca enhances Co dispersion and the amount of CO adsorbed. However, increase in the amount of CO adsorbed does not translate into increase in CO conversion. The Co-Cu-based catalysts display higher amount of H2 adsorbed and higher CO desorption temperature. The latter is at the expense of the amount of CO adsorbed for low CO conversion resulting in lower activity for FT synthesis. The catalysts display high selectivity towards oxygenates. The high CO adsorption strength on Co-Cu-based catalysts is rationalized in terms of synergistic interaction of CO with cobalt particles through carbon atom and copper particles through oxygen atom.

Keywords

Adsorption, Alumina, Copper–Cobalt Catalysts, Desorption.
User
Notifications
Font Size

Abstract Views: 216

PDF Views: 78




  • Effect of Copper on Calcium-Modified Alumina-Supported Cobalt Catalysts towards Fischer-Tropsch Synthesis

Abstract Views: 216  |  PDF Views: 78

Authors

Sudip Maity
Liquid Fuels Section, Central Institute of Mining and Fuels Research (DC), Dhanbad 828 108, India
Olusola O. James
Liquid Fuels Section, Central Institute of Mining and Fuels Research (DC), Dhanbad 828 108, India
Biswajit Chowdhury
Applied Chemistry Department, Indian School of Mines, Dhanbad 828 108, India
Aline Auroux
Institute de Rechereches sur la Catalyse et l’Environnement de Lyon, UMR 5256, CNRS/Universite Lyonl, France

Abstract


The present study reports the possibility of using copper as a low-cost reduction promoter in cobaltbased Fischer-Tropsch (FT) catalysts. Adsorption behaviour of CO and H2 on alumina-supported Co and Co-Cu catalysts has been examined. Amount of CO and H2 desorption and temperature of desorption are used to gain insights about the performance of the catalysts. Presence of Cu alters CO and H2 adsorption on Co-alumina catalyst. Modification of alumina with Ca enhances Co dispersion and the amount of CO adsorbed. However, increase in the amount of CO adsorbed does not translate into increase in CO conversion. The Co-Cu-based catalysts display higher amount of H2 adsorbed and higher CO desorption temperature. The latter is at the expense of the amount of CO adsorbed for low CO conversion resulting in lower activity for FT synthesis. The catalysts display high selectivity towards oxygenates. The high CO adsorption strength on Co-Cu-based catalysts is rationalized in terms of synergistic interaction of CO with cobalt particles through carbon atom and copper particles through oxygen atom.

Keywords


Adsorption, Alumina, Copper–Cobalt Catalysts, Desorption.



DOI: https://doi.org/10.18520/cs%2Fv106%2Fi11%2F1538-1547