Farayandno

Farayandno

Investigating the Efficacy of H-Beta Zeolite Catalyst Modified by Zirconium Nanoparticles in Direct LPG Synthesis from Carbon Dioxide

Document Type : Original research

Author
Mehdi Sedighi
Department of Chemical Engineering, University of Qom, Qom, Iran
10.22034/farayandno.2024.2025749.1955
Abstract
Carbon dioxide is a critical driver of climate change and a significant byproduct of numerous anthropogenic activities, particularly industrial processes. Contemporary developments in the energy sector underscore the necessity of CO₂ valorization, specifically its transformation into valuable chemicals or fuels. This study focuses on the direct hydrogenation of carbon dioxide for the synthesis of liquefied petroleum gas (LPG). The research utilizes a beta zeolite catalyst augmented with zirconium nanoparticles to investigate the direct hydrogenation of carbon dioxide for liquefied petroleum gas (LPG) synthesis. The experimental protocol employs a fixed bed reactor to evaluate crucial operational variables, including reaction temperature and residence time. The results indicate that optimal conditions for liquid gas production are achieved at a temperature of 380°C with a residence time of 12 g.h.mol⁻¹. Under these specified experimental parameters, the study reports a carbon dioxide conversion rate of 29.2% and a selectivity of 39.3% towards hydrocarbon products. The distribution of hydrocarbon products was further analyzed, revealing that ethane, LPG, and C2+ hydrocarbons comprised 10.2%, 66.2%, and 15.2% of the product stream, respectively. Fourier-transform infrared (FTIR) spectroscopy of pyridine adsorption on the Zr/zeolite-β catalyst identified the formation of new Brønsted and Lewis acid sites, which are essential for facilitating the chemical conversion of carbon dioxide. The catalyst demonstrated remarkable stability, maintaining its activity over an extended period of 100 hours without any detectable deactivation. During the experimental period, the carbon dioxide conversion rate remained consistently stable at approximately 20.5%. Additionally, the catalyst exhibited high selectivity towards the desired products, achieving selectivities of 10.8% for methane, 60.5% for LPG, and 18.3% for C₂+ hydrocarbons. However, after 100 hours of operation, catalyst deactivation was observed, resulting in a decline in CO₂ conversion to 12.3% and a reduction in LPG selectivity to 52.4%.
Keywords
LPG Synthesis
Carbon Dioxide Hydrogenation
Acidity
Deactivation
Selectivity

Subjects

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