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Preparation of metal supported montmorillonite catalyst: A new approach (1990)

Ravindranathan, P. ; Malla, P. B. ; Komarneni, S. ; [et al.]

Springer

Catalysis letters 6 (1990), S. 401-407

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ISSN: 1572-879X

Keywords: Catalyst ; montmorillonite ; clays ; copper metal ; polyol process

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract A new approach for the preparation of metal supported montmorillonite catalyst is reported here for the first time. The polyol process in which ethylene glycol is used as reducing agent was employed for the preparation of uniformly distributed copper metal particles on and within the montmorillonite matrix. A hydroxy copper acetate intercalated form of montmorillonite was refluxed at 195 °C with liquid ethylene glycol for 6 h. The reduction of copper acetate to copper metal was apparent from the red color of the reduced product. An X-ray powder diffraction pattern showed the deposition of copper metal on the external surface of montmorillonite and scanning electron micrographs exhibited uniformly distributed spherical copper metal particles of about 0.5 μm size. This process may also be extended for the preparation of other fine metal particles supported on montmorillonite catalysts.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00764008

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Computational enhancement of an unsymmetric block Lanczos algorithm (1990)

Kim, Hyoung M. ; Craig, Roy R.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 30 (1990), S. 1083-1089

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ISSN: 0029-5981

Keywords: Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mathematics , Technology

Notes: An unsymmetric block Lanczos algorithm has been employed for the dynamic analysis of a large system which has arbitrary damping and/or repeated (or closely spaced) eigenvalues. In the algorithm development, the right and left Lanczos vectors are all theoretically biorthogonal to each other. However, these vectors may lose the biorthogonality owing to cancellation and roundoff errors. For the unsymmetric case there can be a breakdown, even without numerical errors. This paper describes computational techniques which have led to a robust unsymmetric block Lanczos algorithm.

Additional Material: 2 Ill.