Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Effect of syngas conversion and catalyst reduction temperature in the synthesis of ethanol: concentration of water vapor in mesoporous Rh/MCM-41 catalyst
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi. UMSA Universidad Mayor de San Andres, Bolivia.ORCID-id: 0000-0001-8488-4429
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.ORCID-id: 0000-0002-3793-1197
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk teknologi.
Visa övriga samt affilieringar
2015 (Engelska)Ingår i: Catalysis communications, ISSN 1566-7367, E-ISSN 1873-3905, Vol. 69, s. 183-187Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Rh-based catalysts typically show low selectivity to CO2 in the synthesis of ethanol from syngas. However, a novel mesoporous Rh/MCM-41 catalyst shows high selectivity to CO2 in a large range of syngas conversions; 1% to 68%, regulated by adjusting the operation conditions (270-430 degrees C, 30-90 bar and 6000-40,000 ml(syngas)/gcat h). The same effect is obtained at different catalyst reduction temperatures (200 degrees C and 500 degrees C) as well as on the non-reduced catalyst. A high concentration of water vapor seems to occur in the pores of Rh/MCM-41 which may promote the water-gas-shift-reaction, producing extra CO2 and H-2. (C) 2015 Elsevier B.V. All rights reserved.

Ort, förlag, år, upplaga, sidor
Elsevier, 2015. Vol. 69, s. 183-187
Nyckelord [en]
Ethanol, Reduction temperature, Rh/MCM-41, Syngas conversion
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-173417DOI: 10.1016/j.catcom.2015.06.015ISI: 000359885900039Scopus ID: 2-s2.0-84934278111OAI: oai:DiVA.org:kth-173417DiVA, id: diva2:853964
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbete
Anmärkning

QC 20150915

Tillgänglig från: 2015-09-15 Skapad: 2015-09-11 Senast uppdaterad: 2017-12-04Bibliografiskt granskad
Ingår i avhandling
1. Catalytic conversion of syngas to ethanol and higher alcohols over Rh and Cu based catalysts
Öppna denna publikation i ny flik eller fönster >>Catalytic conversion of syngas to ethanol and higher alcohols over Rh and Cu based catalysts
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The thermochemical process converts almost any kind of biomass to a desired final product, i.e. gaseous or liquid transportation fuels and chemicals. The transportation fuels obtained in this way are renewable biofuels, which are alternatives to fossil fuels. During the last few years, thermochemical plants for the production of bioethanol have been launched and another is under construction. A total of about 290 million liters of ethanol are expected to be processed per year, mostly using municipal solid waste. Considerable efforts have been made in order to find a more selective catalyst for the conversion of biomass-derived syngas to ethanol.

The thesis is the summary of five publications. The first two publications (Papers I and II) review the state of the art of ethanol and higher alcohols production from biomass, as well as the current status of synthetic fuels production by other processes such as the Fischer-Tropsch synthesis. Paper III analyses the catalytic performance of a mesoporous Rh/MCM-41 (MCM-41 is a hexagonal mesoporous silica) in the synthesis of ethanol which is compared to a typical Rh/SiO2 catalyst. Exhaustive catalytic testing including the addition of water vapor and modifying the hydrogen partial pressure in the syngas feed-stream which, in addition to the catalyst characterization (XRD, BET, XPS, chemisorption, TEM and TPR) before and after the catalytic testing, have allowed concluding that some water vapor can be concentrated in the pores of the Rh/MCM-41 catalyst. The concentration of water-vapor promotes the occurrence of the water gas shift reaction, which in turn induces some secondary reactions that change the product distribution, as compared to results obtained from the typical Rh/SiO2 catalyst. These results have been verified in a wide range of syngas conversion levels (1-68 %) and for different catalyst activation procedures (catalyst reduction at 200 °C, 500 °C and no-reduction) as shown in Paper IV. Finally, similar insights about the use of mesoporous catalyst have been found over a Cu/MCM-41 catalyst, shown in Paper V. Also in Paper V, the effect of metal promoters (Fe and K) has been studied; a noticeable increase of ethanol reaction rate was found over Cu-Fe-K/MCM-41 catalyst as compared to Cu/MCM-41. 

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2017. s. 98
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:2
Nyckelord
thermochemical process, ethanol, higher alcohols, mesoporous catalysts, rhodium, copper, metal promoters
Nationell ämneskategori
Kemiteknik
Forskningsämne
Kemiteknik
Identifikatorer
urn:nbn:se:kth:diva-196808 (URN)978-91-7729-206-7 (ISBN)
Disputation
2017-01-27, Q2, Osquldas väg 10, Våning 2, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbete
Anmärkning

QC 20161125

Tillgänglig från: 2016-11-25 Skapad: 2016-11-22 Senast uppdaterad: 2017-02-03Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Personposter BETA

Velasco, Jorge A.

Sök vidare i DiVA

Av författaren/redaktören
Lopez Nina, Luis GagarinVelasco, Jorge A.Boutonnet, MagaliJärås, Sven G.
Av organisationen
Kemisk teknologi
I samma tidskrift
Catalysis communications
Fysikalisk kemi

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 89 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf