Catalytic Reduction of Benzaldehyde Under Hydrogen Flow over Nickel-Containing Mesoporous Silica CatalystsReport as inadecuate




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The hydrogenation of benzaldehyde over a series of nickel-containing mesoporous silicas with different nickel contents was studied at atmospheric pressure in the range temperature of 393 - 513 K under H2 ?ow. These materials noted Nin-HMS with n = Si-Ni = 50, 25, 15 have been prepared at room temperature using a route based on hydrogen bonding and self-assembly between neutral primary amine micelles S0 and neutral inorganic precursors I0. They were characterized by their chemical analysis, BET surface area, XRD, FT-IR, and SEM microscopy. The obtained products were benzylalcohol, toluene, benzene with yields depending on the nickel content Si-Ni ratio and reaction temperature. The products of benzaldehyde hydrogenation benzylalcohol, and toluene and hydrogenolysis benzene were preferentially formed at low-middle and high reaction temperature respectively. The mesoporous Ni-containing materials were very active hydrogenation catalysts with almost 90% selectivity to benzylalcohol product and showed excellent stability. A mechanism in which the reaction could be initiated by a benzaldehyde reduction over Nin-HMS materials under hydrogen flow with formation of reaction products is proposed.

KEYWORDS

Nickel; HMS; Benzaldehyde; Reduction; Mesoporous Materials

Cite this paper

A. Saadi, K. Lanasri, K. Bachari, D. Halliche and C. Rabia -Catalytic Reduction of Benzaldehyde Under Hydrogen Flow over Nickel-Containing Mesoporous Silica Catalysts,- Open Journal of Physical Chemistry, Vol. 2 No. 1, 2012, pp. 73-80. doi: 10.4236-ojpc.2012.21010.





Author: Adel Saadi, Kahina Lanasri, Khaldoun Bachari, Djamila Halliche, Chérifa Rabia

Source: http://www.scirp.org/



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