Aluminum chlorohydrate I: Structure studies

Teagarden, Dirk L.; Kozlowski, John F.; White, Joe L.; Hem, Stanley L.

doi:10.1002/jps.2600700711

Cited by 76 publications

(37 citation statements)

References 32 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, although the general discussion on the infrared spectra based on early papers (Brydon and Kodama, 1966;Teagarden et aL, 1981;Goh and Huang, 1986;Occelli and Finseth, 1986;Ktoprogge et aL, 1992Ktoprogge et aL, , 1999Michot et al, 1993;Chevalier et aL, 1994;Kloprogge andFrost, 1998, 1999) is exhaustive, we have no way to verify and confirm the presence of some of the bands with our present equipment, especially the stretching modes at -3500 cm -1. This problem is attributed to the lack of sensitivity of our present Fourier-transform infared device.…”

contrasting

confidence: 70%

Reply to the Comment by J.T. Kloprogge, J.A. Rob Van Veen, E. Booij, and Ray L. Frost on “Enhanced Thermal Stability of Al-Pillared Smectites Modified with Ce and La”

Valverde

Cañizares

Kou

et al. 2001

Clays and clay miner.

View full text Add to dashboard Cite

Valverde et al. (2000) recently reported on the preparation and characterization of Al-pillared smectites modified with Ce and La. The purpose of this work was to study the influence of Ce or La in Al-pillared clays on the thermal and the hydrothermal stability of these materials, previously not studied extensively. In addition, the physicochemical properties of Al-pillared clays modified with Ce or La were investigated using two bentonites.The structure of these materials was studied by X-ray diffraction. Isotherms were determined by Nz adsorption. Thermal stability was determined using thermogravimetric (TG) measurements and ammonia-TPD (temperature programmed desorption) was used to obtain acidity data. In addition, the effect of heating temperature on the untreated clay and derived pillared clays was characterized using infrared spectroscopy.We concluded that (1) Pillared clays modified with Ce or La did not show any apparent structural changes relative to the Al-pillared clays; (2) Pillared clays modified with Ce and La had similar acid properties to Al-pillared clays; (3) In contrast, the thermal and hydrothermal stabilities of these materials were greater than Al-pillared clays. However, Ce-pillared clay appears to be more effective than La-pillared clay in delaying the dehydroxylation of pillared clays with increasing temperature; and (4) The intercalation of Ce and La into Al-pillared clays improved thermal stability, which may increase the utility of these materials as catalysts.We agree with Kloprogge et aL (2001) that there are several papers reporting the preparation of thermally stable pillared clays (McCauley, 1988;Sterte 1991a, 1991b, Booij et al., 1996a, 1996b and we thank them for bringing our attention to earlier papers (Kloprogge et al., 1994;Kloprogge, 1998) suggesting that "the relatively low micropore volume can probably be explained by the incorporation of a relatively large amount of Ce or La in the interlayer between the pillars during the synthesis of the pillared clays where initial REE/A1 ratios of-----1.8 were maintained" (Kloprogge et al., 2001).However, although the general discussion on the infrared spectra based on early papers (Brydon and Ko-

show abstract

contrasting

confidence: 70%

Reply to the Comment by J.T. Kloprogge, J.A. Rob Van Veen, E. Booij, and Ray L. Frost on “Enhanced Thermal Stability of Al-Pillared Smectites Modified with Ce and La”

Valverde

Cañizares

Kou

et al. 2001

Clays and clay miner.

View full text Add to dashboard Cite

show abstract

“…This is also the reason for instability of another flat-Al 13 species due to the lower surface charge [13]. Structural reorganization might occur to form more stable solution Keggin Al 13 [14]. It is interesting that the aggregation of Al 13 occurs at pH 6.0-6.5.…”

Section: Discussionmentioning

confidence: 99%

Hydrolyzed Al(III)-clusters. II: Speciation transformation and stability of Al13 aggregates

Chen

Wang

et al. 2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

“…This is also of interest in several other fields such as catalysis, pharmaceuticals, paper industry (Teagarden et al, 1981;Pinnavia, 1983). However, due to the quite complicated nature of Al(III) hydrolysis, the properties of Al 13 -nanoflocculant need further exploration.…”

Section: Introductionmentioning

confidence: 99%

Hydrolyzed Al(III) clusters: Speciation stability of nano-Al13

Wang

Huang

et al. 2011

Journal of Environmental Sciences

View full text Add to dashboard Cite

Pure nano-Al 13 and aggregates at various concentrations were prepared to examine the particle size effect of coagulation with inorganic polymer flocculant. The property and stability of various species formed were characterized using Infrared, 27 Al-NMR, photo correlation spectroscopy (PCS), and Ferron assay. Results showed that concentration and temperature exhibited different roles on the stability of Al 13 . The quantity of Al b species analyzed by ferron assay in the initial aging period corresponded well with that of Al 13 , which has been confirmed in a dimension range of 1-2 nm by PCS. Al 13 solutions at high concentrations (0.5-2.11 mol/L) were observed to undergo further aggregation with aging. The aggregates with a wide particle size distribution would contribute to the disappeared/decreased Al 13 basis on the 27 Al-NMR spectrum, whereas a part of Al 13 would still remain as Al b . At low concentrations, Al 13 solution was quite stable at normal temperature, but lost its stability quickly when heating to 90°C.

show abstract

Aluminum chlorohydrate I: Structure studies

Cited by 76 publications

References 32 publications

Reply to the Comment by J.T. Kloprogge, J.A. Rob Van Veen, E. Booij, and Ray L. Frost on “Enhanced Thermal Stability of Al-Pillared Smectites Modified with Ce and La”

Reply to the Comment by J.T. Kloprogge, J.A. Rob Van Veen, E. Booij, and Ray L. Frost on “Enhanced Thermal Stability of Al-Pillared Smectites Modified with Ce and La”

Hydrolyzed Al(III)-clusters. II: Speciation transformation and stability of Al13 aggregates

Hydrolyzed Al(III) clusters: Speciation stability of nano-Al13

Contact Info

Product

Resources

About