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Updated: Jan 10, 2026
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Influence of Basic Solution on Carbonaceous Alumina Supported Nickel Catalysts for CO2 Methanation
Nattinan Pangjeen1, Yuththaphan Phongboonchoo1, Nutthavich Thouchprasitchai1
1Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
Abstract:
In this study, chitosan was employed as a biopolymer template for the preparation of alumina supports via a sol-gel method for nickel-based catalysts in CO2 methanation. The effects of ammonium hydroxide (NH4OH) and sodium hydroxide (NaOH) coagulation agents on the structural formation of alumina were investigated using TGA, FTIR, CHN analysis, FESEM, XRD, N2 adsorption-desorption isotherms, CO2-TPD, NH3-TPD, H2-TPR, and XRF. The C-Al-NH4OH support exhibited superior textural properties and enhanced reducibility of nickel species. However, it was observed that increasing the NH4OH concentration accelerated chitosan adsorption onto aluminum species but hindered the formation of the alumina network, leading to reduced BET surface area and pore volume. Furthermore, TGA results indicated substantial aluminum loss during preparation in a NaOH coagulation bath due to the formation of water-soluble sodium aluminate species. The catalytic activity of Ni/C-Al catalysts for CO2 methanation was evaluated in terms of CO2 conversion and CH4 selectivity. Process optimization was carried out using a face-centered central composite design response surface methodology (FCCCD-RSM) with reaction temperature, H2/CO2 ratio, and gas hourly space velocity (GHSV) as the primary variables. The optimized 30Ni/C-Al-3NH4OH catalyst achieved a maximum CO2 conversion of 93.2% and CH4 selectivity of 97.1% under the optimal conditions at 386 °C, a H2/CO2 ratio of 6, and a GHSV of 7851 h-1. In addition, the catalyst demonstrated excellent stability over a 48-h continuous operation.
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