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Studies from Shandong University Describe New Findings in Environmental Calalysis

May 30, 2014



By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Researchers detail new data in Environmental Calalysis. According to news originating from Jinan, People's Republic of China, by VerticalNews correspondents, research stated, "Highly ordered mesoporous Cu-Ce-O catalysts with different Cu contents have been synthesized by using ordered mesoporous silica KIT-6 as a hard template. The mesostructural order of the negative replica is influenced by the ratio of Cu to Ce."

Our news journalists obtained a quote from the research from Shandong University, "Using XRD, HR-SEM, TEM and EDX analysis, it was found that the ordered mesostructures of the nanocomposites degenerate with increasing Cu concentration, due to CuO leaching during the template removal process and a phase separation at high Cu concentration. Cu ions can replace Ce-ion in the structure of CeO2 at Cu concentrations below 40 mol%. However, the Cu concentration in the final materials is lower than expected from the ratio used in the synthesis. The activity in preferential oxidation of CO in H-2-rich gases (PROX) was tested at a space velocity of 60,000 mL h(-1) g(cat)(-1). The activity of the mesoporous catalysts increases with the concentration of Cu and becomes stable for Cu concentrations higher than 20 mol%. A CO conversion around 100 % can be attained with Cu0.20Ce0.80O2 as catalyst at 160 degrees C. The exit CO concentration can be as low as 70 ppm under these conditions. The CO2 selectivity can reach 100% at low temperature (60-80 degrees C). Direct loading of CuO on the surface of mesoporous CeO2 leads to large CuO crystals and correspondingly low activity. The influence of the pretreatment atmosphere on activity was also studied."

According to the news editors, the research concluded: "Oxidation-reduction-reoxidation cycling can improve the catalytic activity of the catalysts."

For more information on this research see: Ordered mesoporous Cu-Ce-O catalysts for CO preferential oxidation in H-2-rich gases: Influence of copper content and pretreatment. Applied Catalysis B-Environmental, 2014;152():11-18. Applied Catalysis B-Environmental can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands.

The news correspondents report that additional information may be obtained from D. Gu, Shandong University, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Jinan 250100, People's Republic of China. Additional authors for this research include C.J. Jia, H. Bongard, B. Spliethoff, C. Weidenthaler, W. Schmidt and F. Schuth.

Keywords for this news article include: Asia, Jinan, Environmental Calalysis, People's Republic of China

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Source: Ecology, Environment & Conservation