Synthesis and characterization of Zn/Al and Pt/Zn/Al layered double hydroxides obtained by the sol–gel method

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

“…[70,71] Another feature that makes these sol-gel materials distinguishable from and more attractive than the naturally occurring hydrotalcites or those produced from other synthetic methods is their high specific surface area of ca 150 m 2 /g or higher. [26,68,71,72] The specific surface area of the hydrotalcites was 10-25% greater than that achieved by co-precipitation, [17,29,42,68 -90] but with controversial results regarding the basicity and the M II /M III ratios. [26,51,52] …”

“…[26,68,71,72] The specific surface area of the hydrotalcites was 10-25% greater than that achieved by co-precipitation, [17,29,42,68 -90] but with controversial results regarding the basicity and the M II /M III ratios. [26,51,52] …”

“…High surface areas and narrow pore size distribution are known to enhance the catalytic properties of the LDHs and these desirable properties can be achieved simply by thermal decomposition. [17,26,28,29] Thermal decomposition of co-precipitated LDHs up to 700…”

Layered Double Hydroxides

“…Then, the pH of the solution is increased to approximately 10 by the addition of NaOH, and the solution is refluxed or aged until a gel is formed. The gel is then isolated by centrifugation or filtration, washed multiple times with ethanol and deionized water, and dried [53,60,71]. LDHs prepared by the solegel approach were found to exhibit a higher specific surface area than those prepared by coprecipitation procedures [60].…”

Layered double hydroxides: precursors for multifunctional catalysts

“…Whatever the method used for preparing a metal/ M II (M III )O catalyst, the basic properties are improved, (i) when the M II (M III )O support likely contains Mg cations, (ii) after calcination at temperature above 773 K, (iii) at M II /M III ratio of 2-3, and (iv) using an elaboration method favoring the appearance of a higher proportion of O 2) at low coordinated sites [3,34,44].…”