Swelling Pretreatment of Coals for Improved Catalytic Temperature-Staged Liquefaction

Levent Artok, Alan Davis, Gareth D. Mitchell, Harold H. Schobert

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Two coals, a Texas subbituminous C and a Utah high-volatile A bituminous, were used to examine the effects of solvent swelling and catalyst impregnation on liquefaction conversion behavior in temperature-staged reactions for 30 min each at 275 and 425 °C in H2 and 95:5 H2:H2S atmospheres. Methanol, pyridine, tetrahydrofuran, and tetrabutylammonium hydroxide were used as swelling agents. Molybdenum-based catalyst precursors were ammonium tetrathiomolybdate, molybdenum trisulfide, molybdenum hexacarbonyl, and bis(tricarbonylcyclopentadienylmolybdenum). Ferrous sulfate and bis(dicarbonylcyclopentadienyliron) served as iron-based catalyst precursors. In addition, ion exchange was used for loading iron onto the subbituminous coal. For most experiments, liquefaction in H2–H2S was superior to that in H2, regardless of the catalyst precursor. The benefit of the H2S was greater for the subbituminous, presumably because of its higher iron content relative to the hvAb coal. Tetrabutylammonium hydroxide was the only swelling agent to enhance conversion of the hvAb coal significantly; it also caused a remarkable increase in conversion of the subbituminous coal. The combined application of solvent swelling and catalyst impregnation also improves liquefaction, mainly through increased oil yields from the hvAb coal and increased asphaltenes from the subbituminous. A remarkable effect from use of ammonium tetrathiomolybdate as a catalyst precursor is substantial increase in pristane and phytane yields. Our findings suggest that these compounds are, at least in part, bound to the coal matrix.

Original languageEnglish (US)
Pages (from-to)67-77
Number of pages11
JournalEnergy and Fuels
Volume7
Issue number1
DOIs
StatePublished - Jan 1 1993

Fingerprint

Coal
Liquefaction
Swelling
Catalysts
Molybdenum
ferrous sulfate
Iron
Temperature
Impregnation
Pristane
Asphaltenes
Pyridine
Methanol
Ion exchange
Oils

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Artok, Levent ; Davis, Alan ; Mitchell, Gareth D. ; Schobert, Harold H. / Swelling Pretreatment of Coals for Improved Catalytic Temperature-Staged Liquefaction. In: Energy and Fuels. 1993 ; Vol. 7, No. 1. pp. 67-77.
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Swelling Pretreatment of Coals for Improved Catalytic Temperature-Staged Liquefaction. / Artok, Levent; Davis, Alan; Mitchell, Gareth D.; Schobert, Harold H.

In: Energy and Fuels, Vol. 7, No. 1, 01.01.1993, p. 67-77.

Research output: Contribution to journalArticle

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