Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, October--December 1993
Abstract
Three different synthesis protocols were used to synthesize nanosize molybdenum sulfide particles in the microemulsion system polyoxyethylene(5)nonylphenyl ether (NP-5)/cyclohexane/water: (a) acid-solubilized microemulsion plus tetrathiomolybdate (ASMPT), (b) tetrathiomolybdate-solubilized microemulsion plus acid (TSMPA) and (c) microemulsion plus microemulsion (MPM), i.e., acid-solubilized microemulsion plus tetrathiomolybdate-solubilized microemulsion. The particle size was found to depend on the synthesis method, especially at water-to-surfactant molar ratios (R) greater than 2.5. At R=3.5-4.5, the average particle size increased according to the synthesis method in the order: ASMPT < MPM < TSMPA. Furthermore, for each synthesis protocol, the average particle diameter increased with the water-to-surfactant molar ratio (R). These trends are rationalized by considering: (a) the increase in the rate of exchange of materials between the inverse micelles as R is increased, and (b) the different effects of the electrolytes (i.e., sulfuric acid and ammonium tetrathiomolybdate plus sodium hydroxide) on microemulsion stability.
- Authors:
- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 85191
- Report Number(s):
- DOE/PC/90054-T13
ON: DE95014749
- DOE Contract Number:
- AC22-90PC90054
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: Sep 1994
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; 40 CHEMISTRY; COAL LIQUEFACTION; CATALYSTS; CHEMICAL PREPARATION; MOLYBDENUM SULFIDES; PROGRESS REPORT; MICROEMULSIONS; WATER; CYCLOHEXANE; PARTICLE SIZE; SURFACTANTS; EXPERIMENTAL DATA
Citation Formats
Boakye, E, Radovic, L R, and Osseo-Asare, K. Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, October--December 1993. United States: N. p., 1994.
Web. doi:10.2172/85191.
Boakye, E, Radovic, L R, & Osseo-Asare, K. Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, October--December 1993. United States. https://doi.org/10.2172/85191
Boakye, E, Radovic, L R, and Osseo-Asare, K. 1994.
"Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, October--December 1993". United States. https://doi.org/10.2172/85191. https://www.osti.gov/servlets/purl/85191.
@article{osti_85191,
title = {Novel nanodispersed coal liquefaction catalysts: Molecular design via microemulsion-based synthesis. Technical progress report, October--December 1993},
author = {Boakye, E and Radovic, L R and Osseo-Asare, K},
abstractNote = {Three different synthesis protocols were used to synthesize nanosize molybdenum sulfide particles in the microemulsion system polyoxyethylene(5)nonylphenyl ether (NP-5)/cyclohexane/water: (a) acid-solubilized microemulsion plus tetrathiomolybdate (ASMPT), (b) tetrathiomolybdate-solubilized microemulsion plus acid (TSMPA) and (c) microemulsion plus microemulsion (MPM), i.e., acid-solubilized microemulsion plus tetrathiomolybdate-solubilized microemulsion. The particle size was found to depend on the synthesis method, especially at water-to-surfactant molar ratios (R) greater than 2.5. At R=3.5-4.5, the average particle size increased according to the synthesis method in the order: ASMPT < MPM < TSMPA. Furthermore, for each synthesis protocol, the average particle diameter increased with the water-to-surfactant molar ratio (R). These trends are rationalized by considering: (a) the increase in the rate of exchange of materials between the inverse micelles as R is increased, and (b) the different effects of the electrolytes (i.e., sulfuric acid and ammonium tetrathiomolybdate plus sodium hydroxide) on microemulsion stability.},
doi = {10.2172/85191},
url = {https://www.osti.gov/biblio/85191},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 1994},
month = {Thu Sep 01 00:00:00 EDT 1994}
}