Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Hayder Muneam,S. David Jackson,Salih Hadi,Mohanad Mousa Kareem

doi:10.1007/s40090-015-0069-1

Hayder Muneam, S. David Jackson + Show 2 more

Open Access

https://doi.org/10.1007/s40090-015-0069-1

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Abstract

A (Co,Mn)(Co,Mn)2O4/MgO catalyst was prepared by simple co-precipitation from an aqueous solution of the mixed metal salts using sodium carbonate. The calcination of the precipitate was characterized by TGA and XRD showing the generation of (Co,Mn)(Co,Mn)2O4/MgO by 773 K. The catalyst had a surface area of 45 m2 g−1 in the fully calcined state (873 K) and was characterized by XRD and TGA. Characterization by TPR of the catalyst calcined at different temperatures revealed an annealing process that lowered the surface energy of the catalyst thereby inhibiting reduction. The calcined catalyst was active for the dehydrogenation of isopropanol to acetone and propene with the peak reaction temperature ~428 K and a second reaction zone around 613 K related to strongly bound alcohol. Lattice oxygen was reactive from 463 K converting adsorbed alcohol into carbon dioxide.

Highlights

IntroductionSpinels represent a wide range of compounds all having the same general formula, AB2O4, where A and B are divalent and trivalent metal cations that typically sit in tetrahedral
Spinels represent a wide range of compounds all having the same general formula, AB2O4, where A and B are divalent and trivalent metal cations that typically sit in tetrahedralChemistry Department, College of Science, Babylon University, P.O
The effect of the calcination temperature studied. We believe that this is the first such study. Characterization of this catalyst was done by using a range of techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and surface area determination (BET)

Summary

Introduction

Spinels represent a wide range of compounds all having the same general formula, AB2O4, where A and B are divalent and trivalent metal cations that typically sit in tetrahedral. Methods used in the ceramics industry to prepare this spinel starting from manganese and cobalt oxide precursors require heat treatment at high temperatures (C1172 K) and need long treatment times [9]. From this type of preparation method the powders produced have large particle sizes and low surface areas. We believe that this is the first such study Characterization of this catalyst was done by using a range of techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and surface area determination (BET). The catalyst was heated at 5 K min-1 from room temperature to 673 K and held for 30 min

Results and discussion

Conclusions

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