Abstract
The presence of greenhouse gases in the atmosphere has triggered global warming and climate change. An effective approach to overcome these issues is to convert greenhouse gases into syngas. In this study, Ni-Ru/SiO<sub>2</sub> catalyst was used to catalyze the dry reforming process of methane (CH<sub>4</sub>) and carbon dioxide (CO<sub>2</sub>) into syngas. The catalyst was prepared using different synthesis protocols: sol gel-coprecipitation and impregnation methods. Characterization using Brunauer Emmett Teller analysis showed that the catalyst prepared using both methods exhibited comparable pore diameters and high surface areas. The X-ray diffractometer analysis also indicated the presence of different NiO, RuO<sub>2</sub>, and SiO<sub>2</sub> phases. Furthermore, the activity of the catalyst was investigated using a fixed bed reactor. Based on the results, the optimum catalytic activity was obtained from the catalyst prepared via the sol gel-coprecipitation method, with an average CH<sub>4</sub> and CO<sub>2 </sub>conversions of 37% and 50%, respectively. In addition, our catalyst also showed a 114% higher CH<sub>4</sub> conversion with an enhanced H<sub>2</sub>/CO ratio compared to identical catalysts from other studies.
Highlights
According to the US Environmental Agency in 2018, the main components of greenhouse gases are carbon dioxide (CO2) and methane (CH4), with a percentage of 80% and 10%, respectively (Figure 1)
The synthesis of the catalysts was carried out using different synthesis methods
In the sample obtained from the sol gel-coprecipitation method, a surface area reduction of 54.7% and 51.13% was observed in samples 1 and 2, respectively
Summary
According to the US Environmental Agency in 2018, the main components of greenhouse gases are carbon dioxide (CO2) and methane (CH4), with a percentage of 80% and 10%, respectively (Figure 1). The presence of greenhouse gases in the atmosphere can induce the rise of global surface temperature of up to 1.1oC [1]. This issue can trigger global climate change and reduce the stability of the climate system, as well as its tendency to cause global warming. The National Oceanic and Atmospheric Administration Earth System Research Laboratory (2020) reported an increase in atmospheric CO2 concentration, with an average of 1.84 ppm per year in the past 41 years (1979-2020). In 2007-2013, an increase in CH4 concentration with an average of 5.7 ± 1.1 ppb per year was reported. From 2014 to 2019, the rise of global CH4 sharply increased to an average of 9.3 ± 2.2 ppb per year. In 2019, the CH4 concentration reached 10.4 ± 0,6 ppb
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