A NOVEL APPROACH TO CATALYTIC DESULFURIZATION OF COAL Page: 1 of 15
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A Novel Approach to Catalytic Desulfurization of Coal
DOE Grant No.: DE-FG22-95PC95208
Semi-Annual Report c
Due: February 31, 1998 r,
Prof. John G. Verkade, PI rn
Iowa State University
Abstract. The reactions of dialkyl mono- and disulfides and functionalized alkylthio compounds
with sodium in refluxing hydrocarbon solvent (tetradecane, mesitylene or toluene) resulted in
sulfur-free products in very high yields. Greater than 95% sulfur removal was observed when
dialkyl mono or polysulfides were treated with Na in liquid ammonia. Polycyclic aromatic
sulfur heterocycles were only moderately desulfurized under these conditions while phenylthio
derivatives gave thiophenol as the major product and dithiophenols as the minor products.
A. Optimize the coal desulfurization reaction with respect to time, temperature, coal type and
Coal(S) + excess PR3 - 3 Coal + S=PRz/PBu3 (1)
the R groups (including R = H), and also on extraction, impregnation and sonication
B. Optimize the conditions for the HDS reaction
H2 + S=PR3 HS + PR3 (2)
(which allows the PR3 to function as an HDS catalyst for coal) with respect to R group,
temperature, pressure, H2 gas flow rate and inert solvent presence.
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Verkade, John G. A NOVEL APPROACH TO CATALYTIC DESULFURIZATION OF COAL, report, February 28, 1998; Morgantown, West Virginia. (https://digital.library.unt.edu/ark:/67531/metadc704379/m1/1/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.