TY - JOUR
T1 - Synthesis of mesoporous manganosilicates Mn-MCM-41, Mn-MCM-48 and Mn-MCM-L at a low surfactant/Si ratio
AU - Zhao, Dongyuan
AU - Goldfarb, Daniella
PY - 1995/1/1
Y1 - 1995/1/1
N2 - This chapter focuses on the synthesis of mesoporous manganosilicate materials Mn-M41 S, having hexagonal (Mn-MCM-41), cubic (Mn-MCM-48) and lamellar (Mn-MCM-L) structures, at a low surfactant/silica ratio (0.12), and present a preliminary account on the location of the Mn2+ cations as obtained from Q-band EPR spectroscopy. It shows that the addition of Mn ions induces the formation of the cubic phase also at a low surfactant/Si ratio (0.12), and that by the variation the base content of the gel, one can control the structure formed. Mesoporous manganosilicate molecular sieve, Mn-M41 S, having hexagonal (Mn-MCM-41), cubic (Mn-MCM-48), lamellar (Mn-MCM-L) structure, were synthesized in low surfactant/Si ratio (0.12) and characterized by X-ray powder diffraction, transmission electron microscopy (TEM), themogravimetric analysis (TGA) and electron paramagnetic resonance (EPR). The phase transformations trends: hexagonal ∼ lamellar ∼ cubic -∼ hexagonal or hexagonal hexagonal, lamellar mixture ∼ cubic ∼ lamellar were observed by variations of the base or acid content of the gel or reaction temperature respectively.
AB - This chapter focuses on the synthesis of mesoporous manganosilicate materials Mn-M41 S, having hexagonal (Mn-MCM-41), cubic (Mn-MCM-48) and lamellar (Mn-MCM-L) structures, at a low surfactant/silica ratio (0.12), and present a preliminary account on the location of the Mn2+ cations as obtained from Q-band EPR spectroscopy. It shows that the addition of Mn ions induces the formation of the cubic phase also at a low surfactant/Si ratio (0.12), and that by the variation the base content of the gel, one can control the structure formed. Mesoporous manganosilicate molecular sieve, Mn-M41 S, having hexagonal (Mn-MCM-41), cubic (Mn-MCM-48), lamellar (Mn-MCM-L) structure, were synthesized in low surfactant/Si ratio (0.12) and characterized by X-ray powder diffraction, transmission electron microscopy (TEM), themogravimetric analysis (TGA) and electron paramagnetic resonance (EPR). The phase transformations trends: hexagonal ∼ lamellar ∼ cubic -∼ hexagonal or hexagonal hexagonal, lamellar mixture ∼ cubic ∼ lamellar were observed by variations of the base or acid content of the gel or reaction temperature respectively.
UR - https://www.scopus.com/pages/publications/37949014766
U2 - 10.1016/S0167-2991(06)81888-4
DO - 10.1016/S0167-2991(06)81888-4
M3 - Article
AN - SCOPUS:37949014766
SN - 0167-2991
VL - 97
SP - 181
EP - 188
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
IS - C
ER -