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PublicationCrystal Growth Design
Year2013
Volume13
Pages2476-2485
International

Micron-Sized Single-Crystal-like CoAPO-5/Carbon Composites Leading to Hierarchical CoAPO‑5 with Both Inter- and Intracrystalline Mesoporosity

Authors:Manuel Sánchez Sánchez, Alicia Manjón-Sanz , Isabel Díaz Carretero, Álvaro Mayoral , Enrique Sastre
Groups of research:Molecular Sieves
Commercial mesopores-containing carbon (carbon black BP2000) has been used as crystallization host as well as hard template of intracrystalline mesopores in CoAPO-5
materials prepared with N-methyldicyclohexylamine as specific structure-directing agent. As a result, micrometer-sized AFIstructured terminated-tip (pencil-like) hexagonal prims have been obtained. Despite the appearance of single crystals, the crystals are actually composites formed by a large number of elongated-shape CoAPO-5 and carbon nanodomains. Indeed, the removal of carbon by calcination leaves an inorganic Co doped AlPO4-based material having a complex hierarchical pore system, formed by the expected microporosity for an AFI structured
material and both intra- and intercrystalline mesoporosity. In good agreement with the nanocomposite nature of these micrometer-sized crystals, the size of their fibers generated by burning the carbon matrix can be relatively controlled by the conditions of the calcination processes. Under optimized synthesis and calcination conditions, AFI-structured materials with high mesoporous surface area and pore volume can be afforded.
Keywords:CoAPO-5, mesoporosity
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