Vapor and liquid phase hydrotreatment of hydropyrolysis tar with hydrous titanium oxide catalysts
Thermal decomposition of coal under hydrogen pressure (hydropyrolysis) is a possible route to chemical feedstocks and synthetic fuels. Tar yields are significantly higher than those obtained by conventional carbonization. Above about 750/sup 0/C, primary tars hydrocrack to give appreciable yields of benzene and ethane. Unfortunately, methane yields and, consequently, hydrogen consumptions are also high. However, tar vapors can be catalytically hydrotreated at about 400/sup 0/C to give distillable liquids. In early studies, the yields were low (<10% daf coal) principally because the reactors were operated at relatively low pressure (<50 bar). Recently, much higher yields of low boiling products (20 to 25% daf coal) with little methane have been obtained in a two-stage fixed-bed reactor operated up to 250 bar and using a commercial Ni-Mo/alumina catalyst. Previous work by one of the authors has demonstrated that hydrous titanium oxide (HTO) exchanged with Pd can hydrogenate polynuclear aromatic compounds at much lower temperatures and pressures than conventional Ni-Mo and Co-Mo on alumina catalysts. In the present study, HTO formulations containing Ni, Co, Mo and Pd have been used to hydrotreat tar produced by hydropyrolysis. Batch liquid-phase hydrotreatment of condensed tar was initially used to compare the activity of the catalysts. Subsequently, the catalysts were employed to hydrotreat tar vapors passed through the catalytic stage of a two-stage hydropyrolysis reactor. The results of these tests with the HTO catalysts are compared to those obtained with a commercial Ni-Mo/alumina catalyst. 9 refs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Coal Research Establishment, Cheltenham (UK)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6360182
- Report Number(s):
- SAND-86-2306C; CONF-871030-2; ON: DE87009541
- Resource Relation:
- Conference: International conference on coal science, Maastricht, Netherlands, 26 Oct 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
HYDROGENATION
PYROLYSIS
COAL TAR
CATALYTIC CRACKING
CATALYTIC EFFECTS
MOLYBDENUM
NICKEL
PRESSURE EFFECTS
TEMPERATURE EFFECTS
TITANIUM OXIDES
VAPORS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
MATERIALS
METALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TAR
THERMOCHEMICAL PROCESSES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
010409* - Coal
Lignite
& Peat- Pyrolysis & Carbonization- (1987-)