MicroChannel Reactors for

Microstructures on Macroscale MicroChannel Reactors for Medium- and Large-Size Processes... 

Development of a CO remover employing microchannel reactor for polymer electrolyte fuel cells... 

A microchannel reactor for CO preferential oxidation was developed. The reactor was consisted of microchannel patterned stainless steel plates which were coated by R11/AI2O3 catalyst. The reactor completely removed 1% CO contained in the Ha-rich reformed gas and controlled CO outlet concentration less than Ippm at 130 200°C and 50,000h. However, CH4 was produced from 180"C and CO selectivity was about 50%. For high performance of present PrOx reactor, reaction temperature should be carefully and uniformly controlled to reach high CO conversion and selectivity, and low CH4 production. It seems that the present microchaimel reactor is promising as a CO removal reactor for PEMFC systems. 

Rouge, A., Spoetzl, B., Gebauer, K., Sghenk, R., Renken, a., MicroChannel reactors for fast periodic operation the catalytic dehydration of isopropanol,... 

J. P., Matlosz, M., MicroChannel reactors for kinetic measurement influence of diffusion and dispersion on experimental accuracy, in Matlosz, M., Ehreeld, W, Baselt, J. P. (Eds.), Microreaction Technology - IMRET 5 Proc. 5th International Conference on Microreaction Technology, Springer-Verlag, Berlin (2001), pp. 131-140. 

Chen, G., Yuan, Q., Li, S., MicroChannel reactor for methanol autothermal reforming, Chin.J. Catal. 2002, 23, 22-23. 

A laboratory-scale microprocess plant was built using a falling-film microreactor for the first step and an interdigital mixer-microchannel reactor for the second one (see Figure 5.14) [50]. 

Researchers at the Pacific Northwest National Laboratory have explored the Pd/ZnO catalysts extensively and developed microchannel reactors for the reforming of methanol for H2 production for portable fuel cell applications. Their research works have been published in recent reviews.163 168 192... 

Tonkovich, A.Y., Zilka, J.L., LaMont, M.J., Wang, Y., and Wegeng, R.S. MicroChannel reactors for fuel processing applications. I. Water gas shift reactor. Chemical Engineering Science, 1999, 54, 2947. 

The introduction of the catalyst presents one of the main problems in using MSRs for heterogeneously catalyzed reactions. There are some examples of reactors that are constructed directly from the catalytically active material. Kestenbaum et al. [145] used silver foils for the construction of a microchannel reactor for the partial oxidation of ethene to oxirane. A similar concept was proposed by Fichtner et al. [91,146], These authors used a microstructured rhodium catalyst for the partial oxidation of methane to syngas. This reaction can be considered as a coupling of the exothermic oxidation and the endothermic reforming of methane, which occur at different reaction rates. In such a case, the formation of a pronounced axial temperature profile can be avoided through the use of a material with high thermal conductivity. The reactor... 

A. Rouge, B. Spoetzl, K. Gebauer, R. Schenk, A. Renken, MicroChannel reactors for fast periodic operation the catalytic dehydrogenation of isopropanol, Chem. Eng. Sci. 56 (2001) 1419. 

S. Walter, E. Joarmet, M. Schiel, I. Boullet, R. Philipps, M.A. Liauw, MicroChannel reactor for the partial oxidation of isoprene, in M. Matlosz, W. Ehrfeld, J.P. Baselt (Eds.), Proceedings of the 5th International Conference on Microreaction Engineering (IMRET 5), Springer, Berlin, 2001, p. 387. 

Yamada YMA, Watanabe T, Torii K et al (2009) Catalytic membrane-installed microchannel reactors for one-second allylic arylation. Chem Commun 5594—5596... 

Figure 6.16 Modular microchannel reactor for gas-solid reactions. (Adapted from Ref.

Deshmukh SR, Tonkovich AL, Jarosch KT, Schrader L, Fitzgerald SP, Kilanowski DR, Lerou JJ, Mazanec TJ. (2010) Scale-up of microchannel reactors for Fischer-Tropsch synthesis. Ind. Eng. Chem. Res., 49 10883-10888. 

In microreactors, the friction factor is not independent of wall surface roughness. Moreover, molecular interaction with the walls increases relative to intermolecular interactions when compared to macro-scale flows. In macro-scale systems, two boundary conditions will be applied, that is, a no-slip-flow in which the fluid next to the wall exhibits the velocity of the fluid normally being zero in the most common conditions, and a slip flow in which the velocity of the fluid next to the wall is not zero, and is affected by the wall friction effects and shear stress at the wall. In the case of the slip-flow conditions, a significant reduction in the friction pressure drop and thus reducing the power consumption required to feed the fluid into the microchannel reactor. For most cases in microreactors, the = 0.1 continuum flow with slip boundary conditions is applied. In addition, the pressure drop inside the microreactor is minimal in comparison to that of macro-scale systems (Hessel et ai, 2005b). 

A microchannel reactor for high-temperature steam reforming of methane, isooctane and a benchmark fuel was developed by Whyatt et al. [41]. The main... 

The catalyst, y-alumina is deposited in the microchannels according to a special experimental procedure, allowing a uniform catalytic layer in the channels [6]. The efficient use of the microchannel reactor for periodic operation at cycle periods as short as Is was evidenced in an experimental study [6]. 

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