Effect of Drying Conditions on the Catalytic Performance, Structure, and Reaction Rates over the Fe-Co-Mn/MgO Catalyst for Production of Light Olefins

Abstract

The MgO-supported Fe-Co-Mn catalysts, prepared using co-precipitation procedure, were tested for production of light olefins via CO hydrogenation reaction. The effect of a range of drying conditions including drying temperature and drying time on the structure and catalytic performance of Fe-Co-Mn/MgO catalyst for Fischer-Tropsch synthesis was investigated in a fixed bed micro-reactor under the same operational conditions of T = 350 °C, P = 1 bar, H2/CO = 2/1, and GHSV = 4500 h -1 . It was found that the catalyst dried at 120 °C for 16 h has shown the best catalytic performance for CO hydrogenation. Furthermore, the effect of drying conditions on different surface reaction rates was also investigated and it was found that the precursors drying conditions influenced the rates of different surface reactions. Characterization of catalyst precursors and calcined samples (fresh and used) was carried out using powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Brunauer-Emmett-Teller (BET) measurements, Temperature Programmed Reduction (TPR), Thermal Gravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC). Characterization results showed that different investigated variables (drying conditions) influenced the structure, morphology and catalytic performance of the ternary catalysts.

CO hydrogenation reaction on Fe–Co–Mn nanocatalyst: impact of support and process conditions on performance and structure

“…In order to use the equation of a plug reactor for the calculation the rate of CO consumption in a differential reactor, the equation wileyonlinelibrary.com/jctb was changed, as explained in our previous works. [32][33][34][35][36] Finally Eqn (4) was obtained:…”

Enhancement of the Texture & Morphology of Nano γ-Alumina as a Support for Naphtha Reforming Catalyst

“…Drying has a direct effect on the reactant's diffusion and many factors can influence the morphology of the synthesis gel including temperature, aging time, synthesis gel composition, and structure-directing agent [6]. One of the most important steps in catalyst preparation using precipitation methods is drying the obtained precipitate and the drying method affects the final catalyst's structure, texture, porosity, surface area, and morphology [7]. Washing silica gels which were produced using tetraethylorthosilicate (TEOS) and ammonium hydroxide (NH4OH) with various aprotic solvents show that the pore volume increased [8].…”

Influence of pretreatment conditions on the catalytic behavior and structure of Fe‐Co‐Mn / MgO FTS nanocatalyst: Modeling and optimization using RSM

“…18 In our previous works the effect of different preparation and operational parameters on the catalytic performance of Fe-Co-Mn/MgO catalyst and also kinetic of CO hydrogenation reaction over these catalysts were investigated. [19][20][21][22][23][24][25] It was found that the catalytic performance and structural characteristics of the catalysts were strongly affected by these conditions. It was also found that the kinetic and mechanism of the CO hydrogenation reaction depend obviously on the catalyst preparation method.…”