Aerogel chromia

See also Corundum transition to, 2 403 P-Alumina, 2 408 y-Alumina, 2 391, 403, 404, 406t y-Alumina, 2 403, 404, 406t 8-Alumina, 2 404, 406t 0-Alumina, 2 404, 406t K-Alumina, 2 404, 406t p-Alumina, 2 394-395 Alumina-aluminum titanate, 5 570 Alumina-chromia-thoria, catalytic aerogels, l 763t... 

U.S. imports for consumption, 6 545t Chromia-alumina, catalytic aerogels, 7 763t... 

A series of Chromia-Alumina aerogel catalysts containing different contents of chromium was prepared by autoclave method. The specific areas of the catalysis were measured with Ng at 77°K according to the BET method. Their structural properties were determined from the X ray diffraction patterns recorded on a philips diffractometer PW 1050/70. EPR measurements were performed with a 8ruker ZOO TT spectrometer at 77°K operating in X band. DPPH was used as the g value standard. Kinetic data were obtained in dynamic pyrex microreactor operating at atmospheric pressure as described elsewhere (ref. 3). 

H. Zarrouk, A. Ghorbel, G. M. Pajonk and S. J. Teichner, EPR Investigation of Chromia Alumina Aerogel Catalysts for the Transformation of Isobutane by NO into Methacrylonitrile, Proc. 9 th Ibero Americain Symposium on Catalysis, Lisbon, July 16-21, 1984, pp 339 - 348. 

Willey RJ, Lai H, Peri JB (1991) Investigation of iron oxide-chromia-alumina aerogels for the selective catalytic reduction of nitric oxide by ammonia. J Catal 130 319-331... 

Figure 8.7. MonoUthic aerogels prepared via the epoxide addition method A. alumina, B. chromia, C. p-FeOOH (akaganeite), D. Ni(ll)-based aerogel, E. tungsten oxide, and F. tin oxide.

The preparation of nanocomposite aerogels made out of zero-valent metal or alloy nanoparticles in an insulating aerogel matrix has attracted a great deal of effort in view of the preparation of materials for catalysis, biomedicine, optoelectronics, and sensors. As it is the case for aU sol-gel nanocomposites, silica is by far the most investigated matrix for supporting metal/alloy nanoparticles, although alumina, titania, chromia, and polymer supports have also been proposed. 

Rotter H, Landau MV, Carrera M, Goldfarb D, Herskowitz M (2004) High surface area chromia aerogel efficient catalyst and catalyst supprat fra ethylacetate combustion. Appl Catal B 47 111-126... 

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