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Marek Lewandowski,Maria Bartoszewicz,Karolina Jaroszewska,Gérald Djéga-Mariadassou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
This review gives a brief presentation of the types, structure, synthesis, and application of amorphoustransition metal borides (Mt-B) in particular the bulk or supported nickel and cobalt borides (NiB andCoB). Mt-B materials are amorphous metal-metalloid alloys and constitute an important group of catalyticsystems due to their special chemical and physical properties, including broad composition, structuralhomogeneity, and high concentration of coordination unsaturated sites. These features along withthe relatively cheap and simple methods of synthesis make them interesting alternative catalytic materialsfor numerous new, cost-effective, and environmentally sustainable yields and applications. Muchattention has been paid to Mt-B as an interesting alternative to the industrially applied catalysts basedon expensive and/or susceptible to sulphur poisoning, precious metals, and Raney nickel. Therefore, thisreview presents the application of Mt-B in different sectors: chemical production, energy storage/conversion,and environmental remediation. The current and future directions of research in this area areanalysed.
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Rafał Janus,Mariusz Wa˛drzyk,Marek Lewandowski,Piotr Natka nski,Piotr Ła˛tka,Piotr Ku strowski 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
A series of mesoporous silicas with bimodal porosity combining the features of broad-mesoporousSBA-15 and narrow-mesoporous MCM-41 was synthesized by the pseudomorphic transformation ofSBA-15. The pore size of the MCM-41-like fraction was adjusted using different quaternary ammoniumsalts, while the degree of pseudomorphic transformation was tuned by the alkalinity of the mother-silicadissolving agent. The produced silicas were applied as hard templates for the synthesis of carbon replicasby nanocasting. The mechanism of pseudomorphic transformation of mesoporous silica was for thefirsttime investigated non-directly, employing the strategy of inverse carbon nanoreplication followed bycomprehensive study of the textural and structural parameters of replicas with regard to silica matrices. It was found that the conversion of SBA-15 into MCM-41 occurs simultaneously throughout the entireparticle’s body according to the mechanism of homogeneous pseudomorphic transformation. It wasevidenced that the strategy of inverse carbon replication could be successfully employed as an ingenioustool for non-direct investigation of suchlike silica transformations towards hierarchical porous systems. Furthermore, the unique bimodal mesoporosity of the carbons obtained from SBA-15 partiallytransformed into MCM-41 opens a possibility for their application in a variety of purposes, mainly incatalysis and adsorption.
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