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Full-Text Articles in Chemistry
Development Of Catalytic Chromia-Based Aerogels, Fiona Fitzgerald
Development Of Catalytic Chromia-Based Aerogels, Fiona Fitzgerald
Honors Theses
Over one billion automobiles are in use around the world, the majority of which employ internal combustion engines. Catalytic converters are used to convert the toxic compounds found in car exhaust -- carbon monoxide, nitrogen oxides (NOx) and hydrocarbons -- to less harmful gases. The typical catalytic converter employs as catalysts expensive raw materials (platinum, palladium and/or rhodium) wash-coated onto an alumina-based ceramic substrate. Aerogel materials have high surface area and thermal stability, properties that make them attractive for catalysis applications. Aerogels made with transition metal oxides are candidates to replace platinum in the catalytic converter. Chromium oxide (chromia) materials …
Investigation Of Ceria-Nickel Containing Aerogels For Catalytic Converter Applications, Xiao Peng Li
Investigation Of Ceria-Nickel Containing Aerogels For Catalytic Converter Applications, Xiao Peng Li
Honors Theses
Aerogels have physical properties that make them appealing for automotive exhaust catalysis: they are highly porous with low density and high surface area. Current catalytic converter technology uses precious metals (Pt, Pd and Rh) to oxidize CO and unburned hydrocarbons and reduce NO. Catalytic-metal-containing aerogel can potentially be a less expensive alternative for use in catalytic converters. Prior work with nickel-alumina aerogels indicated promise for this application; the goal of including ceria is to increase oxygen storage and thereby enhance catalytic ability. Here, cerium- and nickel-containing aerogels, with an alumina backbone and silica backbone, are fabricated using an epoxide-assisted recipe …
Synthesis And Characterization Of Organically Modified Hectorites For Sequestration Of Pfaas From Contaminated Drinking Water, Alexandra Pagano
Synthesis And Characterization Of Organically Modified Hectorites For Sequestration Of Pfaas From Contaminated Drinking Water, Alexandra Pagano
Honors Theses
Perfluoroalkyl Acids (PFAAs), a family of industrial chemicals, are found in household products such as pizza boxes, microwave popcorn bags, and non-stick pans. PFAAs of different carbon chain lengths and ionic head groups exist, such as PFOA (perfluorooctanoic acid) and PFOS (perfluorooctane sulfonic acid). Used without regulation in industry for decades, PFAAs only recently became recognized as contaminants of emerging concern, since they are bioaccumulative in organisms, persistent in the environment, and toxic. PFAAs are known to accumulate in the blood, liver and kidneys, and drinking water contaminated with PFAAs has been linked to certain types of cancer. Therefore, it …