TY - JOUR
T1 - Trimeric chromium oxyformate route to chromia-pillared clay
AU - Yoon, J. B.
AU - Hwang, S. H.
AU - Choy, J. H.
PY - 2000/10/20
Y1 - 2000/10/20
N2 - A chromia-pillared clay has been prepared by ion exchange type intercalation reaction between the sodium ion in montmorillonite and the trimeric chromium oxyformate (TCF) ion, and by subsequent heat-treatment. The structural and thermal properties have been systematically studied by thermal analysis, powder XRD, IR spectroscopy, and XAS. The gallery height of ~6.8 Å upon intercalation of the TCF ion suggests that the Cr3O plane is parallel to the aluminosilicate layers. Even though the basal spacing of TCF intercalated clay decreases slightly upon heating, the layer structure was retained up to 550 °C as confirmed by XRD and TG/DTA. According to the EXAFS spectroscopic analysis, it is identified that the (Cr-Cr) distance of 3.28 Å between vertex-linked CrO6 octahedra in TCF splits into 2.64 Å, 2.98 Å, and 3.77 Å due to the face-, edge-, and corner-shared CrO6 octahedra after heating at 400 °C, implying that a nano-sized chromium oxide phase was stabilized within the interlayer space of clay.
AB - A chromia-pillared clay has been prepared by ion exchange type intercalation reaction between the sodium ion in montmorillonite and the trimeric chromium oxyformate (TCF) ion, and by subsequent heat-treatment. The structural and thermal properties have been systematically studied by thermal analysis, powder XRD, IR spectroscopy, and XAS. The gallery height of ~6.8 Å upon intercalation of the TCF ion suggests that the Cr3O plane is parallel to the aluminosilicate layers. Even though the basal spacing of TCF intercalated clay decreases slightly upon heating, the layer structure was retained up to 550 °C as confirmed by XRD and TG/DTA. According to the EXAFS spectroscopic analysis, it is identified that the (Cr-Cr) distance of 3.28 Å between vertex-linked CrO6 octahedra in TCF splits into 2.64 Å, 2.98 Å, and 3.77 Å due to the face-, edge-, and corner-shared CrO6 octahedra after heating at 400 °C, implying that a nano-sized chromium oxide phase was stabilized within the interlayer space of clay.
UR - http://www.scopus.com/inward/record.url?scp=0034692862&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0034692862
SN - 0253-2964
VL - 21
SP - 989
EP - 994
JO - Bulletin of the Korean Chemical Society
JF - Bulletin of the Korean Chemical Society
IS - 10
ER -