Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Sanyuan Yang"'
Autor:
Sanyuan Yang, Gordon J. Kennedy, W.G. Borghard, Robert A. Fletcher, Anthony F. Marlow, T.W. Vetter, John R. Sieber, Jennifer R. Verkouteren, Alexandra Navrotsky, M.G. Moreno-Ramirez, Rolf Zeisler, Stefan D. Leigh, J.F. Kelly, Mark E. Davis, Brian H. Toby, Shirley Turner, Eric S. Windsor
Publikováno v:
Microporous and Mesoporous Materials. 107:252-267
Zeolites have important industrial applications including use as catalysts, molecular sieves and ion exchange materials. In this study, three zeolite materials have been characterized by the National Institute of Standards and Technology (NIST) as re
Publikováno v:
Microporous and Mesoporous Materials. 87:261-267
Eight initially clear solutions (with a general formula based on molar ratios of the components, xNaOH:(5.86 − x)TMAOH:1.0Al2O3:3.40SiO2:370H2O:19.6EtOH:6.0iso-PrOH, x = 0.06–0.86) with various sodium concentrations were prepared for synthesis of
Autor:
Sanyuan Yang, Alexandra Navrotsky
Publikováno v:
Chemistry of Materials. 16:3682-3687
In situ calorimetry, small-angle X-ray scattering, and pH measurements were used to investigate early stages of nanopatticle formation during early stages of synthesis of silicalite-1 in an initial...
Publikováno v:
Microporous and Mesoporous Materials. 65:137-143
Silicalite-1 nanocrystals were synthesized with different sizes (40, 95 and 180 nm) from clear solutions and the organic structure directing agent removed by calcination. X-ray diffraction, scanning electron microscopy, nitrogen adsorption, Fourier t
Publikováno v:
The Journal of Physical Chemistry B. 107:2709-2718
Restructuring of hexagonal silica/surfactant composites under hydrothermal conditions was studied using in situ scanning microcalorimetry to understand the energetic changes associated with these rearrangements. Thermal processes can be associated wi
In Situ Calorimetric Study of the Growth of Silica TPA-MFI Crystals from an Initially Clear Solution
Autor:
Alexandra Navrotsky, Sanyuan Yang
Publikováno v:
Chemistry of Materials. 14:2803-2811
Direct evidence from in situ calorimetric experiments demonstrates that the crystal growth of silica TPA-MFI zeolite (TPA = tetrapropylammonium, MFI = framework structure code of ZSM-5) at 95 °C from an initially clear solution (9.00TPAOH−25.0SiO2
Autor:
Sanyuan Yang, Alexandra Navrotsky
Publikováno v:
Microporous and Mesoporous Materials. 52:93-103
In this in situ calorimetric method the reaction rate is derived from the rate of evolution of the heat of reaction. The rationale and the procedure to obtain the reaction rate from the recorded heat flow during crystallization are elucidated. One ma
Publikováno v:
The Journal of Physical Chemistry B. 106:3629-3638
The thermodynamics of pure-silica molecular sieves (denoted by their structural codes ^*BEA, MFI, MTW, and STF) are investigated by solution calorimetry at 323.15 K using 25% aqueous HF as solvent. The enthalpies of solution are determined for both c
Publikováno v:
Microporous and Mesoporous Materials. 46:137-151
Synthesis of FAU zeolite from a mixture of silicate and aluminate solutions (5.15Na 2 O–1.00Al 2 O 3 –3.28SiO 2 –165H 2 O) was studied using an in situ calorimetric method at a heating rate of 0.1°C/min. The scanning calorimetric curve provide
Publikováno v:
American Mineralogist. 86:438-447
Natural clinoptilolite (Cpt: Na 0.085 K 0.037 Ca 0.010 Mg 0.020 Al 0.182 Si 0.818 O 2 ·0.528H 2 O) from Castle Creek, Idaho, and its cation-exchanged variants (Na-Cpt, NaK-Cpt, K-Cpt, and Ca-Cpt) were studied by high-temperature calorimetry. The hyd