Microreactor preferential oxidation

Figure 6. Silicon microreactor for preferential oxidation of CO designed for a 0.25 We fuel cell. (The researchers wish to express their gratitude to DARPA for funding Grant N66001-02-1-8942.)...

In the field of microreactors, two main configurations exist, one being the direct coupling of the outlet of a single microreactor to a GC-MS system, such as via a capillary, which is made compatible with the flow requirements of the GC-MS system. An example of this concept can be found in the work of Besser and coworkers, who applied on-line GC-MS for kinetic studies of the preferential oxidation of CO in silicon microreactors the microchaimel walls of which were covered with a thin-film catalyst [50]. The outlets of four silicon microreactors running in parallel are fed... 

A silicon microreactor for preferential oxidation was designed by Srinivas et al. [163], which was 6 cm x 6 cm wide and long, while the flow path was only 400 pm high. Instead of microchannels, pillars were chosen for the flow distribution in the reactor. The reactor was coated with 2 wt.% platinum/alumina catalyst with a thickness of 10 pm. Tests were performed at an O/CO ratio of 2.0 and a high VHSV of 120 l/(h gcat)- Not more than 90% conversion of carbon monoxide could be achieved in the reactor at 210°C reaction temperature, while similar results were obtained for a small fixed catalyst bed. 

Figure 14.25 (a) Cocurrently operated microreactor for preferential oxidation cooled by water evaporation, (b) CO concentration in the off-gas of the reactor at different total reformate flow rates, CO inlet concentrations and O/CO values [167],... 

Ouyang, X, Bednarova, L, Besser, RS, Ho, P. Preferential oxidation (PrOx) in a thin-film catalytic microreactor advantages and limitations. AIChE J. 2005 51(6) 1758-1771. 

Srinivas, S., Dhingra, A., Im, H., and Gulari, E. A scalable silicon microreactor for preferential CO oxidation Performance comparison with a tubular packed-bed microreactor. Applied Catalysis. 

Figure 1.2 Microreactors for (preferential) CO AI2O3 via sol el and wash-coating (up to oxidation (a) differential packed-bed crossflow 250°C) (c) chip with Pt/Al203 immobilized via microreactor (40 x 15 x 1.5 mm) with Rh and Pt sol-gel infiltration (up to 300°C). Reprinted catalysts (upto 175°C) (b) chip (6 x 6cm) with from [20], Copyright 2002, and [24], Copyright staggered rows of pillars covered with 10 pm Pt/ 2004, with permission from Elsevier, and [25],...

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