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Title: 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}
}