Hydrothermal Reconstructing Routes of Alkali-Free ZnAl Layered Double Hydroxide: A Characterisation Study

Abstract

A facile, rapid, and noninvasive method for reconstructing ZnAl layered double hydroxide (LDH) is reported. ZnAl LDH series were synthesized at different Zn2+/Al3+ atomic ratio (1.5-4) via an alkali-free method and reconstructed under hydrothermal route (HTM) for the first time. Fresh Zn/Al LDHs were activated at 300°C and reconstructed under hydrothermal process. A better insight and correlation study between the physiochemical properties of reconstructed ZnAl LDH in terms of their crystallinity, surface area and basicity also will be gained here. BET surface area of rehydrated samples increased up to 355 m2/g (Zn:Al ratio 3:1). CO2-TPD probed high number of basic sites density (0.1 mmol/g).

Reconstruction of the ZnAl Mixed Oxides Into the Layered Double Hydroxide Catalysts Active in the Aldol Condensation of Furfural: The Role of ZnO Particles

“…All reconstructed materials are highly susceptible to the adsorption of atmospheric CO 2 , which results in a decrease in the efficiency of the catalytic activity (Abelló et al, 2005;Xu et al, 2013). ZnAl RE-LDHs can also be prepared the hydrothermal reconstructing route (Tajuddin et al, 2019), and the anion exchange rate, e.g. in the presence of NaCl solution (Kang and Park, 2022).…”

Conversion of Waste Cooking Oil to Biodiesel Catalysed by ZnAl Layered Double Hydroxide

“…Recently, alkali-free method is introduced in the preparation of hydrotalcites to avoid alkalicontaminant and sodium entrain in the catalyst backbones (A.Tajuddin et. al., 2018;Tajuddin et al, 2019). In this method, ammonia and ammonium carbonate have been used instead of sodium hydroxide.…”