Syngas conversion to ethanol over a mesoporous Cu/MCM-41 catalyst: Effect of K and Fe promoters
2016 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 526, 77-83 p.Article in journal (Refereed) Published
Transportation fuels such as ethanol can be obtained through thermochemical processing of biomass. Interest in the development of more selective catalysts for the conversion of biomass-derived syngas (H2 + CO) to ethanol is increasing in both academia and industry. In this work, we have evaluated the performances of K and Fe as metal promoters of a mesoporous Cu/MCM-41 catalyst and their effects on the product selectivity and especially on ethanol formation. The metal loading was 29 wt.% Cu, 2 wt.% Fe and 1.6 wt.% K. The catalysts were tested at 300 °C, 20 bar and gas-hourly-space-velocities in the range of 1500–30000 mlsyngas/gcat h; under these conditions the syngas conversion level was between 2 and 11%. The non-promoted Cu/MCM-41 catalyst showed interesting selectivity toward oxygenated compounds, mostly methanol. The addition of K as promoter increases the selectivity toward methanol even more, while the addition of Fe as promoter favors the formation of hydrocarbon compounds. When both K and Fe as promoters are incorporated into the Cu/MCM-41 catalyst, the reaction rate to oxygenated compounds is notably increased, especially for ethanol. The space time yield for ethanol for the Cu/MCM-41 catalyst is 0.3 × 10−5 carbon-mol/gcath which increases to 165.5 × 10−5 carbon-mol/gcath for the Cu-Fe-K/MCM-41 catalyst. From XPS analysis, the Cu-Fe-K/MCM-41 catalyst was found to have the following atomic composition: Cu0.34Fe0.08K0.08Si1.00. The promoting effect of both K and Fe, may be related to an increased reaction rate toward CO non-dissociation and CO-dissociation paths, respectively, which is beneficial for the ethanol formation. Further catalytic results, catalyst characterization and discussion of results are presented in this work.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 526, 77-83 p.
Copper, Ethanol, Mesoporous MCM-41, Promoters, Syngas, Catalysts, Copper compounds, Dissociation, Ethanol fuels, Hydrocarbon refining, Iron compounds, Mesoporous materials, Methanol, Reaction rates, Synthesis gas, Catalyst characterization, Gas hourly space velocities, Hydrocarbon compounds, Product selectivities, Syn-gas, Thermochemical processing, Catalyst selectivity
IdentifiersURN: urn:nbn:se:kth:diva-195315DOI: 10.1016/j.apcata.2016.08.006ISI: 000384865600010ScopusID: 2-s2.0-84981263991OAI: oai:DiVA.org:kth-195315DiVA: diva2:1045574
QC 201611102016-11-102016-11-022016-11-25Bibliographically approved