Abstract
The present study focuses on the catalytic conversion of syngas (CO + H2) through Fischer–Tropsch (FT) route using two identically prepared 0.1 wt.% palladium promoted Mesoporous Alumina (MA) and SBA–15 supported Co (15 wt.%) catalysts. The Fischer–Tropsch activity is performed in a fixed bed tubular reactor at temperature 220 °C and pressure 30 bar with H2/CO ratio ~2 having Gas Hourly Space Velocity (GHSV) of 500 h−1. Detail characterizations of the catalysts are carried out using different analytical techniques like N2 adsorption-desorption, Temperature-programmed reduction with hydrogen (H2-TPR), Temperature-programmed desorption with NH3 (NH3-TPD), X-Ray Diffraction (XRD), and Transmission Electron Microscopy (TEM). The results show that the SBA–15 supported catalyst exhibits higher C6–C12 selectivity (57.5%), and MA supported catalyst facilitates the formation of higher hydrocarbons (C13–C20) having a selectivity of 46.7%. This study attributes the use of both the support materials for the production of liquid hydrocarbons through FT synthesis.
Highlights
Skyrocketing energy demand for enhancement of human lifestyle, development of industries, and transportation sectors across the globe is a matter of great concern, especially the markets for specified liquid fuels like gasoline, jet, and diesel [1]
The Temperature-Programmed Reduction (TPR), and Temperature-Programmed Desorption (TPD) profiles of the catalysts are measured by using ChemiSorb 2720 (Micrometrics, USA) instrument equipped with a Thermal Conductivity Detector (TCD)
The surface areas of the catalysts are decreased by 28% and 30% respectively after Co impregnation for Co–Pd/Mesoporous Alumina (MA) and Co–Pd/SBA–15 catalysts
Summary
Skyrocketing energy demand for enhancement of human lifestyle, development of industries, and transportation sectors across the globe is a matter of great concern, especially the markets for specified liquid fuels like gasoline, jet, and diesel [1]. Fischer–Tropsch (FT) synthesis and associated technologies like Gas-To-Liquid (GTL), Coal-To-Liquid (CTL) and Biomass-To-Liquid (BTL) routes are a promising alternative for the production of substitutes of petroleum crude They can positively contribute to the world energy security and supplies. The role of Pd promotion on SBA-15 and MA supported cobalt catalysts is systematically evaluated for liquid hydrocarbon synthesis from syngas (CO + H2). Mesoporous Alumina is synthesized through hydrothermal technique with molar compositions of 1.0 Al:0.5 CTAB:5.28 Urea: H2O [26] In this synthesis process, 74 g of Al (NO3)3Á9H2O and 62.15 g of urea are dissolved in 550 mL of de-ionized water and stirred vigorously for 30 min at 35 °C and 35.75 g of CTAB is added to the solution with continued stirring till homogeneous solution is formed. The sample is dried at 120 °C in an air oven for 12 h and calcined at 750 °C @ 5 °C/min for 5 h
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