caa a22 4500 477091938 CHVBK 20180405111517.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF01134028 doi (NATIONALLICENCE)springer-10.1007/BF01134028 New Gallium-substituted hydrotalcites: [Mg1- x Ga x (OH)2](CO3) x /2 · m H2O [Elektronische Daten] [Esteban López-Salinas, Mayela García-Sánchez, Ma. Ramón-García, Isaac Schifter] A series of Ga-containing hydrotalcite-like materials (GaHTs), [Mg1-x Ga x (OH)2](CO3) x/2 ·mH2O wherex = 0.072 ∼ 0.35 (Mg/Ga = 12.9 ∼ 1.8), was synthesized by a coprecipitation method. The resulting solids were characterized by means of X-ray diffraction, thermal gravimetric and infrared analyses. All GaHTs showed diffraction patterns typical of Mg-Al hydrotalcites. Small amounts of brucite, Mg(OH)2, were detected only in the GaHT with Mg/Ga = 12.9. Attempts to obtain Ga-richer hydrotalcites, Mg/Ga < 1.8, resulted in solids with an invariably constant Mg/Ga = 1.8 ratio, which appears to be the maximum Ga content limit. Judging from the TGA pattern of a GaHT (Mg/Ga = 7.7), the layered structure is stable up to ca. 573 K, and at 873 K the resulting solid shows a MgO-like diffraction pattern, suggesting that Ga3+ may be replacing some Mg2+ ions in MgO. Once their layered structure collapses (i.e., at 873 K), GaHT can be easily converted back into the original layered material by treating in a carbonate-containing aqueous solution, i.e., they show the "memory effect” typical of Mg-Al hydrotalcites. Kluwer Academic Publishers, 1996 Ga-substituted hydrotalcite-like materials nationallicence anionic clays nationallicence memory effect nationallicence López-Salinas Esteban Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F. aut García-Sánchez Mayela Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F. aut Ramón-García Ma Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F. aut Schifter Isaac Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F. aut Journal of Porous Materials Kluwer Academic Publishers 3/3(1996-09-01), 169-174 1380-2224 3:3<169 1996 3 10934 https://doi.org/10.1007/BF01134028 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01134028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- López-Salinas Esteban Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F aut NATIONALLICENCE 700 1- García-Sánchez Mayela Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F aut NATIONALLICENCE 700 1- Ramón-García Ma Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F aut NATIONALLICENCE 700 1- Schifter Isaac Subdirección de Transformación Industrial, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730, México, D.F aut NATIONALLICENCE 773 0- Journal of Porous Materials Kluwer Academic Publishers 3/3(1996-09-01), 169-174 1380-2224 3:3<169 1996 3 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer