Capillary microreactors based on hierarchical SiO2 monoliths incorporating noble metal nanoparticles for the Preferential Oxidation of CO

Novel hierarchical SiO2 monolithic microreactors loaded with either Pd or Pt nanoparticles have been prepared in fused silica capillaries and tested in the Preferential Oxidation of CO (PrOx) reaction. Pd and Pt nanoparticles were prepared by the reduction by solvent method and the support used was a mesoporous SiO2 monolith prepared by a well-established sol–gel methodology. Comparison of the activity with an equivalent powder catalyst indicated that the microreactors show an enhanced catalytic behavior (both in terms of CO conversion and selectivity) due to the superior mass and heat transfer processes that take place inside the microchannel. TOF values at low CO conversions have been found to be ∼2.5 times higher in the microreactors than in the powder catalyst and the residence time seems to have a noticeable influence over the selectivity of the catalysts designed for this reaction. The Pd and Pt flexible microreactors developed in this work have proven to be effective for the CO oxidation reaction both in the presence and absence of H2, standing out as a very interesting and suitable option for the development of CO purification systems of small dimensions for portable and on-board applications.

Libre dels repartiments de les terres entre vehins de la molt noble y leal e insigne ciutat de Oriola

Reprod. del ms. fechado en 1310, conservado en la Biblioteca de Cataluña que consta de 87 f. de perg.

(Table 3) Noble gas composition of dissociated gas hydrate specimens from ODP Leg 164 sites

Fractionation of the noble gases should occur during formation of a Structure I gas hydrate from water and CH4 such that CH4 hydrate is greatly enriched in Xenon. Noble gas concentrations and fractionation factors (F[4He], F[22Ne], F[86Kr], and F[132Xe] as well as R/Ra) were determined for eight gas hydrate specimens collected on Leg 164 to evaluate this theoretical possibility and to assess whether sufficient quantities of Xe are hosted in oceanic CH4 hydrate to account for Xe "missing" from the atmosphere. The simplest explanation for our results is that samples contain mixtures of air and two end-member gases. One of the end-member gases is depleted in Ne, but significantly enriched in Kr and Xe, as anticipated if the source of this gas involves fractionation during Structure I gas hydrate formation. However, although oceanic CH4 hydrate may be greatly enriched in Xe, simple mass balance calculations indicate that oceanic CH4 hydrate probably represents only a minor reservoir of terrestrial Xe. Noble gas analyses may play an important role in understanding the dynamics of gas hydrate reservoirs, but significantly more work is needed than presented here.

Women's Volleyball Team, 1980

Back Row:: Barb Canning, Janice Margulies, Carol Ratza, Jackie Madison, Linda Cunningham, Amy Blake, Coach Sandy Vong.

Front Row: Alison Noble, Susan Rogers, Kerri Kenniston, Robin Vissers, Julie Stotesbury, Jeanne Weckler.

Women's Volleyball Team, 1982, UM

Front Row: Jeanne Weckler, Lana Ramthun, Alison Noble, Sue Rogers, Joan Potter, and Deborah Holloway.

Back Row: Asst. Coach Barb Canning, Carla Dearing, Maura Jones, Karyn Kunzelman, Kim Edwards, Jennifer Hickman, Suzanne Harris, coach Sandy Vong.

Women's Volleyball Team, 1983, UM

Left: Assistant Coach Barb Canning

Left diagonal (back to front): Sue Rogers, Lana Ramthun, Jennifer Hickman, Deborah Holloway and Carla Dearing.

Right diagonal (back to front): Barb Bensing, Joan Potter, Alison Noble, Jeanne Weckler, Karyn Kunzelman, Wendy Confer, Kim Edwards and Coach Sandy Vong.

Women's Volleyball Team, 1981, UM

Front Row: Kerri Kenniston, Diane Ratnik, Alison Noble, Susan Rogers, Jeanne Weckler, Debbie Holloway

Back Row: assistant coach Barb Canning, Linda Cunningham, Janice Margulies, Amy Blake, Julie Stotesbury, head coach Sandy Vong