A layered titanosilicate AM-4 as a novel catalyst for the synthesis of 1-methoxy-2-propanole from propylene oxide and methanol

Modified Versions of AM‐4 for the Aqueous Phase Isomerization of Aldo‐Saccharides

“…The SEM images of the AM‐4 type materials showed polycrystalline intergrowth of thin plate lamellae (Figure ), in agreement with literature data , , . The platelets were regularly stacked, some forming rosette‐like aggregates (Fig.…”

“…The acid treatment impacted considerably on the crystalline structure. The XRD pattern of H‐AM‐4 is very similar to that reported in the literature for AM‐4 subjected to HNO 3 treatment . Both space group and cell volume changed after acid treatment.…”

“…Powder XRD pattern of Na‐AM‐4 (dried at 280 °C) showed the resolved peaks at 7.0, 12.5, 14.0, 17.4, 20.1, 20.7, 22.9, 23.5, 28.5–30° and 31.9–32.6° (Figure ). Similar XRD patterns were reported by different groups for AM‐4 materials , , , , , . The patterns of Mex‐AM‐4 materials showed similarities with Na‐AM‐4, albeit some differences in peaks intensity and/or reflections were noticeable.…”

“…Depending on the structural features, materials may be modified to improve their catalytic performances for specific applications. In particular, Aveiro‐Manchester material number 4, AM‐4 (Na 3 (Na,H)Ti 2 O 2 [Si 2 O 6 ] 2 ,2H 2 O) has a unique layered structure and ion exchange ability, allowing to tune its properties for different applications , . The structure of AM‐4 consists of anionic [Ti 2 Si 4 O 14 ] 4– layers formed by brookite‐type TiO 6 and pyroxene‐type SiO 4 polyhedral chains.…”

“…Different elements were introduced into AM‐4 such as, Ag + , Zn 2+ and Cu 2+ , Co 2+ , Sb 3+ , alkali metals (Cs,, K and Rb), alkaline‐earth metals (Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ ), and isotopes of radioactive Am and Pu . Very few catalytic applications were reported to date for the AM‐4 family, and were focused on the hydrothermally as‐synthesized material , , …”