Volatile organic compounds are recognized

as major contributors to air pollution, either directly through their toxic or malodorous natures or indirectly as ozone precursors. Many

VOCs are health hazards in themselves and can cause cancer or other serious illnesses, even at low concentrations. Industrial processes and transportation activities are mainly responsible

for the VOC emissions. Technologies for tue removal of VOCs from gas streams can be broadly classified into two groups: those that recover the VOCs for possible later reuse and those that destroy the VOCs [1].

In this work gold nanoparticles supported over iron, silver /SBA15 was prepared by deposition-precipitation(DP) method with urea, iron-containing mesoporous materials have been synthesized by hard template method, and characterized by BET, DR X , H2 –TPR, TEM techniques

Silver was until recently considered one of the least catalytically useful metals due to its chemical inertness.

the mesoporous materials containing silver support on SBA15 were synthesized by the method of post-synthesis and direct methode synthesis

We tested our synthesized materials as catalysts in esterification reactions of stearic acid, which is a natural molecule of the fatty acid family. Biodiesel is one of the examples of biofuels intended to combine with or replace conventional fuels and reduce the pollution produced by those of petroleum origin.

The catalytic activity and especially the stability of gold catalysts strongly depend on both the state and structure of the support and the specific interaction between gold and the support.

References

[1] : P. «Les compositions organiques volatiles COV dans l'environnement», Le Cloirec, Lavoisier Tec&Doc, Paris, 1998.