Fundamental studies of hydrocarbon conversions over supported bimetallic catalysts
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The function of the Department of Chemical and Biological Engineering has been to prepare students for the study and application of chemistry in industry. This focus has included preparation for employment in various industries as well as the development, design, and operation of equipment and processes within industry.Through the CBE Department, Iowa State University is nationally recognized for its initiatives in bioinformatics, biomaterials, bioproducts, metabolic/tissue engineering, multiphase computational fluid dynamics, advanced polymeric materials and nanostructured materials.
History
The Department of Chemical Engineering was founded in 1913 under the Department of Physics and Illuminating Engineering. From 1915 to 1931 it was jointly administered by the Divisions of Industrial Science and Engineering, and from 1931 onward it has been under the Division/College of Engineering. In 1928 it merged with Mining Engineering, and from 1973–1979 it merged with Nuclear Engineering. It became Chemical and Biological Engineering in 2005.
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1913 - present
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- Department of Chemical Engineering (1913–1928)
- Department of Chemical and Mining Engineering (1928–1957)
- Department of Chemical Engineering (1957–1973, 1979–2005)
- Department of Chemical and Biological Engineering (2005–present)
- College of Engineering(parent college)
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Abstract
The reactions of ethane and ethylene over selected silica-supported group VIII metal catalysts have been investigated using reaction studies and nuclear magnetic resonance (NMR) spectroscopy. The activity of the ruthenium-group IB bimetallic system for the ethane hydrogenolysis reaction was investigated as a function of group IB metal content and ethane and hydrogen partial pressures, while the reactions of ethylene over silica-supported platinum catalysts were studied using NMR;The turnover frequency of the silica-supported ruthenium catalysts for ethane hydrogenolysis as either copper or silver was added tended to change as the group IB metal was first added until a critical point was reached. After this point, increasing the proportion of group IB metal had no significant effect on the specific activity of the catalyst. As was expected, copper, the more strongly segregating element, reached this critical point before silver. The critical point is believed to correspond to the point at which all the edge and corner sites in the supported bimetallic crystallite are occupied by the group IB metal;The apparent orders of reaction for ethane hydrogenolysis over the ruthenium-group IB catalysts was measured as a function of temperature. It appears from these measurements that the principal role of the edge and corner sites of a ruthenium catalyst for this reaction is the desorption and adsorption of hydrogen. At the higher temperatures studied, it appears that copper occupying the low coordination sites of a bimetallic crystallites is also active for the desorption/adsorption of hydrogen;The reactions of ethylene over silica-supported platinum catalysts has been investigated using NMR. The ethylene to surface platinum atom ratio used in this work was in the 10 to 20 range, far higher than that used for typical single crystal studies. No significant activity was observed at room temperature. At temperatures in the 400 K to 550 K region a number of products were identified, including ethane, methane, and cis- and trans-but-2-ene. At still higher temperatures coke was formed on the surface of the catalyst. This coke was characterized as being predominantly aromatic in nature.