Ceramic honeycomb filters and catalysts

Bioinspired engineering of honeycomb structure – Using nature to inspire human innovation

“…There exist several excellent reviews on the wide use of ceramic honeycombs as catalyst support, particulate filter for vehicular emission control and other chemical industrial applications such as NOx reduction, effluent concentrator, catalytic combustion and chemical processes [19]. Groppi and…”

“…Studies on the characteristics of honeycomb structures have been going on for literally thousands of years [10][11][12][13][14][15]. However, honeycomb structures were not incorporated into large-scale applications in human society until about 70 years ago, after which numerous honeycomb structures made from various materials emerged, from papers [16,17], to metals [18], then to ceramics [19] and composites [20]. The technologies used to fabricate honeycomb structures have also been progressively advanced [21][22][23][24].…”

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

“…A higher cell density implies a higher geometric surface area but also more complex manufacturing and washcoating procedures as well as higher pressure drops [82]. Monolith substrates used in automotive applications generally have square channels with a cell density of 300-600 cpsi [86,87]. More than 90% are made of cordierite (2MgO·2Al 2 O 3 ·5SiO 2 ) [83], which offers high mechanical strength, very low thermal expansion coefficient and resistance to high temperatures and thermal shocks [82,85,86].…”

“…For example, by exploiting the dielectric properties of perovskite-type oxides, TWC converters can be dielectrically-heated to minimize exhaust emissions during the cold start of a gasoline engine [87] A cordierite monolith coated with LaCoO 3 exhibits rapid heat-up under microwave irradiation allowing to attain the 50% UHC conversion temperature within 15 s. Similarly, La 0.8 Ce 0.2 MnO 3 was reported as a dielectric material for the periodical regeneration of monolithic soot filters in diesel exhaust after-treatment systems [124]. Perovskite-type oxides are also studied for thermoelectric applications [22]: manganites, cuprates and cobaltites, which are known for their suitable catalytic performance, can be used to build thermoelectric oxide modules for the direct conversion of heat into electricity [136].…”

Preliminary kinetic study on the degradation of nitrobenzene by modified ceramic honeycomb-catalytic ozonation in aqueous solution

“…The reaction mechanism of • OH oxidation also could be confirmed by the investigation of oxidation products and pathway of ceramic honeycomb catalytic ozonation for the degradation of nitrobenzene in aqueous solution [11]. The previous study found that ceramic honeycomb exhibited many excellent characteristics such as high mechanical strength, chemical stability and higher catalytic activity [12].…”