The development and evaluation of microstructured reactors for the water gas shift and preferential oxidation reactions in the 5kW range

O’Connell, Martin; Kolb, Gunther; Schelhaas, Karl-Peter; Schuerer, J; Tiemann, David; Ziogas, Athanassios; Hessel, Volker

doi:10.1016/j.ijhydene.2009.12.113

Cited by 40 publications

(25 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The as-prepared nanoparticles were deposited onto an Al 2 O 3 support. It was found that the Pt− 3Fe/Al 2 O 3 gave a CO conversion of 99% and CO 2 selectivity of 98% at 30−80°C at a GHSV of 10 000 h −1 and was stable at 80°C within 50 h. 117 Our group also reported Pt−Fe/Al 2 O 3 catalysts prepared with Pt(acac) 2 and Fe(acac) 3 as precursors and ethylene glycol as a soft reducing agent in Ar, which showed improved PROX activity over Pt/Al 2 O 3 . 118 Siani et al 119 developed a cluster-derived PtFe/SiO 2 catalyst by using PtFe 2 (COD)(CO) 8 and Pt 5 Fe 2 (COD) 2 (CO) 12 organometallic cluster precursors.…”

Section: Promoted Pgm Catalysts For the Proxmentioning

confidence: 93%

“…Nevertheless, the contribution of this reaction is very small in the low-temperature range (<180°C 2 and TiO 2 , were comparatively less active at 80−120°C than that on the inert supports. The most suitable catalyst for application operating at a temperature range compatible with the PEMFC is Rh-zeolite 3A.…”

Section: Nonpromoted Pgm Catalysts For the Proxmentioning

confidence: 95%

“…158 Interestingly, it seems that the promotional effect of K is more pronounced on the inert-oxidesupported Pt catalysts than that on the reducible-oxidesupported ones. Tanaka et al 162 observed that K−Pt/Al 2 O 3 and K−Pt/SiO 2 exhibited a much higher CO conversion and CO 2 (Figure 3a). Therefore, the desorption of CO from the surface or the adsorption of O 2 is proposed as the rate-determining step on the nonpromoted PGM catalysts.…”

Section: Promoted Pgm Catalysts For the Proxmentioning

confidence: 95%

“…In addition, the Rh catalyst supported on a mixture support of Al 2 O 3 and 3A zeolite was also reported to be a promising candidate for the PROX reaction. 76 Ito et al 77,78 found that adding niobia to Rh catalysts increased the activity and selectivity for the PROX reaction, and the activity was as follows: Rh/Nb 2 Igarashi et al 84 prepared a series of Pt/zeolite catalysts by an ion-exchange method, including Pt/A-zeolite, Pt/mordenite, Pt/X-zeolite, and Pt/Al 2 O 3 , and found that the zeolitesupported Pt catalysts exhibited a much higher selectivity than the alumina-supported ones in feed gas containing a large excess of hydrogen with the addition of a low concentration of oxygen (nearly 100% at 0.05% O 2 ). Pt/mordenite showed the highest conversion of CO to CO 2 among these catalysts, and Pt/A-zeolite catalysts exhibited the highest selectivity with the same CO conversion.…”

Section: Nonpromoted Pgm Catalysts For the Proxmentioning

confidence: 99%

“…In this context, supported gold catalysts may not be the best candidates for PROX applications. On the other hand, Cu-based catalysts, especially in combination with CeO 2 and Fe 2 O 3 , are usually active only above 100°C and exhibit poor resistance toward water and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

2012

View full text Add to dashboard Cite

Preferential oxidation of CO (PROX) is an important reaction for removing small amounts of CO to a parts-per-million level from the hydrogen-rich stream, which will be ultimately supplied as a fuel to polymer−electrolyte membrane fuel cells. The key to the application of PROX is to develop a highly active and selective catalyst that operates well in a wide temperature window (e.g., 80−180°C) and has good resistance to CO 2 and steam. In the past decades, various catalyst formulations have been developed, among which platinum group metal catalysts, including Pt, Ru, and Irin particular, those modified with promoters such as alkali metals and reducible metal oxideshave received a great deal of attention for their significantly improved catalytic activities in the low-temperature range. In this minireview, the recent advances of the platinum group metal catalysts for the PROX reaction are summarized, including performances of unpromoted and promoted catalysts, reaction mechanisms, and kinetics. In addition, the important roles of hydroxyl groups in the PROX reaction are also discussed.

show abstract

Section: Promoted Pgm Catalysts For the Proxmentioning

confidence: 93%

Section: Nonpromoted Pgm Catalysts For the Proxmentioning

confidence: 95%

Section: Promoted Pgm Catalysts For the Proxmentioning

confidence: 95%

Section: Nonpromoted Pgm Catalysts For the Proxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

2012

View full text Add to dashboard Cite

show abstract

Catalytic reactors for fuel processing

Kolb

2016

Multiphase Catalytic Reactors

View full text Add to dashboard Cite

Fuel processing is the conversion of fossil and regenerative fuels to hydrogen-containing gas mixtures. The chemical conversion is performed in most cases in the gas phase, normally heterogeneously catalyzed in the presence of a solid catalyst. The first step of the conversion procedure is named reforming. It has been established in large-scale industrial processes for many decades. The industrial applications most commonly use natural gas as feedstock. The product of the natural gas reforming process is synthesis gas, a mixture of carbon monoxide and hydrogen, which is then used for numerous processes in large-scale chemical production which are not subject of this section but rather the technology, which provides a hydrogen-containing gas mixture, named reformate, which is a feed suitable for a fuel cell. The fuel cell then converts hydrogen to electrical energy. Depending on the fuel cell type, removal of carbon monoxide might be required, which is achieved by water-gas shift and preferential oxidation reactions performed downstream the reformer. The reactor types suitable for mobile and decentralized applications are, apart from conventional fixed-bed reactors, ceramic and metallic monoliths, (microchannel) plate heat exchangers, and membrane reactors which allow the combination of membrane separation with the reactions mentioned previously

show abstract

Micro‐Reactors for Fuel Processing

Kolb

2012

Fuel Cell Science and Engineering

View full text Add to dashboard Cite

The development and evaluation of microstructured reactors for the water gas shift and preferential oxidation reactions in the 5kW range

Cited by 40 publications

References 29 publications

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts

Catalytic reactors for fuel processing

Micro‐Reactors for Fuel Processing

Contact Info

Product

Resources

About