Postgraduate Seminar Presentation : Synthesis of active Nickel hydroxyapatite catalyst for CO2 hydrogenation into methane via oleic acid impregnation

Speaker Wai Ming Hui (Supervisor: A/Prof Sibudjing Kawi)

Host Department of Chemical and Biomolecular Engineering

Date/Time 11 Dec - 11 Dec, 3.00PM

Venue E5-02-32 , Faculty of Engineering, National University of Singapore

Synopsis

Climate warming over the past 50 years is attributed to anthropogenic greenhouse gas concentration, especially CO2, which can be observed in increasing global average temperature. In a bid to soften the negative impact of climate change due to industrial activity and transportation by reducing or eliminate CO2 emission, research on CO2 utilization technology for sustainable production of chemicals and energy generation has intensified in the past few years, especially for CO2 methanation. This reaction is an exothermic reaction and thermodynamically advantageous at low temperature. However, the first challenge in this reaction is that CO2 is very difficult to dissociate via thermo-chemical means at low temperature. The second challenge is when catalyst were operated at high temperature under industrial conditions, catalytic activity decreases over time due to metal sintering. Taking these two challenges into consideration, an ideal CO2 methanation catalyst should be active, selective for CH4 production at low temperature as well as sintering-resistant at higher temperature. In this study, CO2 hydrogenation into methane was performed under atmospheric pressure over a series of nickel on hydroxyapatite catalyst at different ratio, at reaction temperature from 200°C to 450°C in a fixed bed reactor to investigate catalyst performance. Among the tested catalyst, the temperature where 50% conversion was attained for 5NiHAP_OA0.5 was around 310°C. Stability test was performed for this catalyst. Further characterization techniques by H2-TPR, XRD, TEM provides possible indication that strong metal support interaction could be behind enhanced CO2 conversion.

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