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Title: Mixed Alcohols Production from Syngas

Abstract

This project is developing improved catalysts for converting syngas from biomass gasifiers into mixed alcohol products.

Publication Date:
Research Org.:
EERE Publication and Product Library
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B) (Bioenergy Technologies Office Corporate)
OSTI Identifier:
1216398
Country of Publication:
United States
Language:
English
Subject:
biomass, mixed alcohols, syngas, thermochemical, catalyst

Citation Formats

None. Mixed Alcohols Production from Syngas. United States: N. p., 2006. Web.
None. Mixed Alcohols Production from Syngas. United States.
None. Sat . "Mixed Alcohols Production from Syngas". United States. doi:. https://www.osti.gov/servlets/purl/1216398.
@article{osti_1216398,
title = {Mixed Alcohols Production from Syngas},
author = {None},
abstractNote = {This project is developing improved catalysts for converting syngas from biomass gasifiers into mixed alcohol products.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}
  • A process is described for selectively producing mixed alcohols from synthesis gas comprising contacting a mixture of hydrogen and carbon monoxide with a catalytic amount of a catalyst containing components of (1) a catalytically active metal of molybdenum or tungsten, in free or combined form; (2) a cocatalytic metal or cobalt or nickel in free or combined form; and (3) a Fischer-Tropsch promoter of an alkali or alkaline earth series metal, in free or combined form; the components combined by dry mixing, mixing as a wet paste, wet impregnation, and then sulfided, the catalyst excluding rhodium, ruthenium and copper, atmore » a pressure of at least about 500 psig and under conditions sufficient to form the mixed alcohols in at least 20 percent CO/sub 2/ free carbon selectivity, the mixed alcohols containing a C/sub 1/ to C/sub 2-5/ alcohol weight ratio of less than about 1:1.« less
  • No abstract prepared.
  • This deliverable is for Task 9, Mixed Alcohols from Syngas: State of Technology, as part of National Renewable Energy Laboratory (NREL) Award ACO-5-44027, ''Equipment Design and Cost Estimation for Small Modular Biomass Systems, Synthesis Gas Cleanup and Oxygen Separation Equipment''. Task 9 supplements the work previously done by NREL in the mixed alcohols section of the 2003 technical report Preliminary Screening--Technical and Economic Assessment of Synthesis Gas to Fuels and Chemicals with Emphasis on the Potential for Biomass-Derived Syngas.
  • Using a combination of in-situ and ex-situ X-ray Diffraction (XRD), photoelectron spectroscopy (XPS), catalyst reactivity performance studies and ab initio molecular dynamics (AIMD) simulations, the promoting role of lanthanum oxide (La2O3) in the catalytic synthesis of mixed higher (C2-C6) alcohols from syngas on Co based catalysts was investigated. XRD measurements show that doping with La (0.5 wt %) onto activated carbon (AC) supported Co catalyst enhances the Co2C phase formation while the Co2C phase formation is largely suppressed on alumina supported Co catalyst. A strong correlation of the selectivity towards alcohols with the ratio of Co2C/Co presented in the catalystsmore » was observed. Our theoretical ab initio molecular dynamics (AIMD) simulations suggest that, on AC supports under the reaction conditions, La exists as an oxide phase in the form of small clusters in the vicinity of Co particles. It was found that Co2C formation is energetically favorable especially for smaller Co particles where La may be influencing the Co particle size. Theoretical mechanistic studies indicate that oxygenated hydrocarbons can be formed on these catalysts by multiple routes involving. the formation of CHxO and CHxCO species at the interface between the La2O3 phase and Co/Co2C. A detailed comparison with previous findings in the literature, as well as discussion of the implications of these results upon the improvement if the selectivity of these catalysts towards higher alcohols, is presented. The Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.« less
  • The promoting role of lanthanum oxide (La{sub 2}O{sub 3}) in the catalytic synthesis of mixed higher (C{sub 2}-C{sub 6}) alcohols from syngas on Co-based catalysts was investigated using a combination of in situ and ex situ X-ray diffraction (XRD), photoelectron spectroscopy (XPS), catalyst reactivity performance studies, and ab initio molecular dynamics (AIMD) simulations. XRD measurements show that doping with La (0.5 wt %) onto activated carbon (AC) supported Co catalyst enhances the Co{sub 2}C phase formation, whereas the Co{sub 2}C phase formation is largely suppressed on alumina supported Co catalyst. A strong correlation of the selectivity toward alcohols with themore » ratio of Co{sub 2}C/Co particles present in the catalysts was observed. AIMD simulations suggest that on AC supports La exists as an oxide phase in the form of small clusters in the vicinity of Co particles. It was found that Co{sub 2}C formation is energetically favorable, especially for smaller Co particles because of the formation of surface carbide. Theoretical mechanistic studies indicate that oxygenated hydrocarbons can be formed on these catalysts by multiple routes involving the formation of CH{sub x}O and CH{sub x}CO species at the interface between the La{sub 2}O{sub 3} phase and Co/Co{sub 2}C. A detailed comparison with previous findings in the literature as well as discussion of the implications of these results upon the improvement of the selectivity of these catalysts toward higher alcohols is presented.« less