Nanopore and nanoparticle catalysts


Thomas, J.M. and Raja, R. (2001) Nanopore and nanoparticle catalysts. Chemical Record, 1, (6), 448-466. (doi:10.1002/tcr.10003).

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Original Publication URL: http://dx.doi.org/10.1002/tcr.10003

Description/Abstract

The design, atomic characterization, performance, and relevance to clean technology of two distinct categories of new nanocatalysts are described and interpreted. Exceptional molecular selectivity and high activity are exhibited by these catalysts. The first category consists of extended, crystallographically ordered inorganic solids possessing nanopores (apertures, cages, and channels), the diameters of which fall in the range of about 0.4 to about 1.5 nm, and the second of discrete bimetallic nanoparticles of diameter 1 to 2 nm, distributed more or less uniformly along the inner walls of mesoporous (ca. 3 to 10 nm diameter) silica supports. Using the principles and practices of solid-state and organometallic chemistry and advanced physico-chemical techniques for in situ and ex situ characterization, a variety of powerful new catalysts has been evolved. Apart from those that, inter alia, simulate the behavior of enzymes in their specificity, shape selectivity, regio-selectivity, and ability to function under ambient conditions, many of these new nanocatalysts are also viable as agents for effecting commercially significant processes in a clean, benign, solvent-free, single-step fashion. In particular, a bifunctional, molecular sieve nanopore catalyst is described that converts cyclohexanone in air and ammonia to its oxime and caprolactam, and a bimetallic nanoparticle catalyst that selectively converts cyclic polyenes into desirable intermediates. Nanocatalysts in the first category are especially effective in facilitating highly selective oxidations in air, and those in the second are well suited to effecting rapid and selective hydrogenations of a range of organic compounds.

Item Type: Article
ISSNs: 1527-8999 (print)
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Keywords: solvent-free, aluminophosphates, supported ruthenium, low-temperature, mesoporous silica, solvent-free processes, solid acid catalyst, bimetallic nanoparticles, active-sites, molecular-sieve catalysts,bifunctional nanocatalysts, selective oxidation, rutherford scattering, ammonia-synthesis, enzyme mimics
Subjects: Q Science
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 54150
Date Deposited: 31 Jul 2008
Last Modified: 27 Mar 2014 18:37
URI: http://eprints.soton.ac.uk/id/eprint/54150

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