Chemistry and catalysis of coal liquefaction; catalytic and thermal upgrading of coal liquids; and hydrogenation of CO to produce fuels. Volume VII. Final report. [C/sub 2/-C/sub 4/ olefins]
A series of Raney iron (Fe) and Raney iron-manganses (Fe-Mn) catalysts have been investigated for application to the hydrogenation of carbon monoxide for the production of low molecular weight olefins (C/sub 2/ to C/sub 4/). The Raney Fe and Raney Fe-Mn catalysts were prepared by leaching the aluminum from Al-Fe (50/50 weight percent, wt %) and Al-Fe-Mn (59/38/3 wt %) alloys with an aqueous solution of sodium hydroxide. The variables investigated in the catalyst preparation and activation studies included leaching temperature (298 to 363 K), NaOH concentration (2 to 20 wt %), and leaching mode (alloy addition or caustic addition). The Raney catalysts were characterized by x-ray diffraction and BET surface area measurements. The Raney and precipitated catalysts, reduced in-situ in flowing hydrogen, were evaluated in a high pressure fixed-bed reactor to assess catalytic activity and selectivity for the hydrogenation of carbon monoxide at the following standard reaction conditions: pressure = 1465 KPa (200 psig), space velocity = 3.0 cm/sup 3/g/sup -1/s/sup -1/, H/sub 2//CO = 2.0, and reaction temperature of 423 to 473 K. The C/sub 2/-C/sub 4/ hydrocarbon yields for the Raney Fe and the Raney Fe-Mn catalysts were similar, ranging from 34 to 40% at 453 K. However, the Raney Fe-Mn catalysts showed higher C/sub 2/ to C/sub 4/ olefin selectivity than the Raney Fe catalysts. The same trend was found for the precipitated Fe and coprecipitated Fe-Mn catalysts. Less than 7 wt % in the coprecipitated Fe-Mn and in the Raney Fe-Mn catalysts increased the olefin selectivity of the catalyst by a factor of about two. 166 refs., 64 figs., 21 tabs.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Fuels Engineering
- DOE Contract Number:
- AC22-79ET14700
- OSTI ID:
- 5351094
- Report Number(s):
- DOE/ET/14700-T1-Vol.7; ON: DE85014171
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis of low molecular weight olefins over coprecipitated iron-manganese catalysts. Volume VIII. Final report. [C/sub 2/-C/sub 4/ olefins]
Manganese oxide as a promoter for C/sub 2/-C/sub 4/ olefin production in the hydrogenation of carbon dioxide
Related Subjects
010404 -- Coal
Lignite
& Peat-- Gasification
090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALKENES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DATA
DIFFRACTION
ELEMENTS
EXPERIMENTAL DATA
FISCHER-TROPSCH SYNTHESIS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
INFORMATION
IRON
MANGANESE
MEDIUM PRESSURE
METALS
METHANATION
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESEARCH PROGRAMS
SCATTERING
SPECIFICITY
SYNTHESIS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
YIELDS