A Novel Synthetic Route to Layered Double Hydroxides Using Hexamethylenetetramine

For the homogeneous precipitation of hydrotalcite-like compounds (layered double hydroxides; LDHs), HMT (hexamethylenetetramine) was used and the conditions for obtaining the LDHs were investigated. The well-crystallized 1–5 (mu)m LDHs were obtained in a pressure vessel after a 1-day treatment at 140 °C. The resulting LDHs contained a carbonate anion, which was successfully deintercalated using an NaCl–HCl mixed solution without any morphological change.