Transforming Nano Metal Nonselective Particulates into Chemoselective Catalysts for Hydrogenation of Substituted Nitrobenzenes

American Chemical Society Hispana 2015-12

Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química
Universitat Politècnica de València. Departamento de Química - Departament de Química
Ministerio de Economía y Competitividad
Ministerio de Ciencia e Innovación
Generalitat Valenciana
Serna, Pedro
Corma Canós, Avelino

The hydrogenation of nitro compounds is an industrial process that has experienced a renovated interest in the last 10 years due to the discovery of highly selective and environmentally friendly solid catalysts. Particularly, the performance of chemoselective reactions in the presence of very sensitive groups such as double and triple CC bonds, with H-2 as reductant and no soluble additives needed, had been elusive for decades. The discovery that gold nanopartides on solid supports could carry out such a reaction very selectively invigorated this area of research and claimed gold as an outstanding catalyst beyond oxidation processes. Subsequent work, devoted to understand how gold catalysts operate, established a strong basis for the design of more efficient materials and the development of new routes for the synthesis of nitro derivatives. Here, we present three generations of materials that allowed improving the performance of the original gold catalysts. The relatively low activity of the initial Au/TiO2 catalysts could be first boosted, without practical loss of selectivity, by the design of a material that incorporated two catalytic functions on the support: small amounts of platinum to enhance H-2 dissociation and a greater amount of gold to activate the -NO2 group. Later, we learned how to control the catalytic structures and induce chemoselectivity to traditionally unselective metals such as platinum, ruthenium, and nickel nanoparticles. Recently, Fe2O3 nanoparticles surrounded by a nitrogen-doped carbon layer have erupted as a promising alternative. A remarkable outcome from all that work is that the final pool of catalytic alternatives has been markedly expanded. Diversity is important because different solutions may open new gates to different catalytic processes, and we summarize here how the scope of new reactions and products could be expanded by means of properly designed metal catalysts in which the support and metal work in a concerted way to direct

Gold catalysis; selective hydrogenation; reduction of nitro compounds; supported nanoparticles design; green hydrogenation chemistry; strong metal-support interactions; cascade reactions; QUIMICA ORGANICA; info:eu-repo/semantics/article

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TEXT
English

UPV oai:riunet.upv.es:10251/63956
urn:issn:2155-5435
info:doi:10.1021/acscatal.5b01846
https://riunet.upv.es/bitstream/10251/63956/12/Manuscript rev.pdf.jpg
1019869037

UNIVERSITAT POLITECNICA DE VALENCIA
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