Abstract
Mixed metal oxide (MMO) is one of the widely utilized ceramic materials in various industries. In order to obtain high performance, the specific surface area of MMO should be controlled. Calcination of layered double hydroxide (LDH) is a versatile way to prepare MMO with homogeneous metal distribution and well-developed porosity. Although researchers found that the specific surface area of LDH-originated MMO was relatively high, it had not been systematically investigated how the surface area is controlled under a certain parameter. In this review, we summarized LDH-originated MMO with various starting composition, calcination temperature, and pore developing agent in terms of specific surface area and porosity. Briefly, it was represented that MMOs with Mg-Al components generally had higher specific surface area than Mg-Fe or Zn-Al components. Calcination temperature in the range 300–600 °C resulted in the high specific surface area, while upper or lower temperature reduced the values. Pore developing agent did not result in dramatic increase in MMO; however, the pore size distribution became narrower in the presence of pore developing agents.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
Application and utility of Mixed metal oxides (MMO) is increasing in various fields such as catalysts, electrodes, adsorbents, construction, environment, etc. due to their diverse composition and high specific surface area
According to the literature survey, calcination at moderate temperature 300–600 ◦ C resulted in pure MMO with fairly high specific surface area
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The MMOs prepared by sol-gel route are known to have high specific surface area with well-developed porosity [15]. Mataji et al [17] prepared Zn-Fe/Zr-MMO in a cost-effective manner utilizing hydrothermal method at 180 ◦ C for 2 h This method is useful in controlling particle size with high homogeneity; its unidentified reaction mechanism hindered minute control of reaction process [18]. One of the characteristic features of MMO derived from LDH is the development of porous structure through gasification process, resulting in relatively high specific surface area. By selecting the appropriate metal composition in LDH, controlling calcination temperature, or incorporating poredeveloping template in LDH synthesis, it is possible to control the specific surface area and porosity of MMOs
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
