Fatima Ammari, born in Medjana (Algeria) July 3, 1974, received her Engineering degree at Sét if-1 University of Algeria, in 1998, was the winner of the national contest in Chemical Engineering BAF (1998) and got a 4 years of scholarship in France. She obtained the PhD title in Chemistry from Louis Pasteur University of Strasbourg, France, in 2002. Currently she is a Lecturer researcher in the Department of chemical process engineering, Ferhat-Abbas Sétif-1 University. Dr Ammari’s research integrates engineering, applied chemistry, materials, catalysis and nanomaterials,. She authored and contributed to 7 scientific papers published on international journals on these topics with 2 in J. Catal and 2 in CatTod and she communicated his works to 16 international conferences.
Mixed copper−zinc catalysts supported on silica were prepared by incipient wetness impregnation o... more Mixed copper−zinc catalysts supported on silica were prepared by incipient wetness impregnation of nitrate salt solution. The influence of the drying temperature on the properties of the final calcined and/or reduced material was investigated. It was shown that, as in the case of monometallic Cu or Zn systems, after a drying step performed at 25 °C, the nitrates are still present as an amorphous compound, whereas the drying step at 90 °C led to the formation of a poorly crystallized hydroxynitrate compound. From XRD and DTG measurements, it was concluded that the hydroxynitrate compound in the mixed systems is a copper−zinc hydroxynitrate [Cu2−xZnx(OH)3(NO3)] in which the two cations are closely associated. After reduction at 350 °C, a “memory effect” of the drying step was observed, and the intermediate formation of the mixed hydroxynitrate led to a better interdispersion of Cu0 and ZnII in the reduced material than when drying was performed at room temperature. This is attested by the higher selectivity...
In this work, carbon nanofibers (CNFs) have been successfully functionalized by using different a... more In this work, carbon nanofibers (CNFs) have been successfully functionalized by using different approaches and finally used for the preparation of Ru based catalysts.
Cotton stalks-based biochars were prepared and used to synthetize Ru-supported catalysts for sele... more Cotton stalks-based biochars were prepared and used to synthetize Ru-supported catalysts for selective production of γ-valerolactone from levulinic acid in aqueous media. Different biochars’ pre-treatments (HNO3, ZnCl2, CO2 or a combination of them) were carried out to activate the final carbonaceous support. Nitric acid treatment resulted in microporous biochars with high surface area, whereas the chemical activation with ZnCl2 substantially increases the mesoporous surface. The combination of both treatments led to a support with exceptional textural properties allowing the preparation of Ru/C catalyst with 1422 m2/g surface area, 1210 m2/g of it being a mesoporous surface. The impact of the biochars’ pre-treatments on the catalytic performance of Ru-based catalysts is fully discussed.
Abstract A series of -SO3R functionalized activated carbons (R=H, O, aryl) were prepared and appl... more Abstract A series of -SO3R functionalized activated carbons (R=H, O, aryl) were prepared and applied in fructose dehydration reaction to 5-hydroxymethylfurfural. Different sulphonating methods introduce groups on catalyst surface with distinct donor-acceptor and hydrophilic properties. Their nature influences significantly not only activated carbon’s textural and chemical properties but also the product yields and selectivity in fructose dehydration reaction. The viability of the solvent free reaction was also investigated and compared to the performance of the catalyst series in presence of DMSO, where the best catalytic results were obtained.
Les alcools a,b insatures sont des produits tres importants en synthese organique, ils peuvent et... more Les alcools a,b insatures sont des produits tres importants en synthese organique, ils peuvent etre obtenu par hydrogenation selective des aldehydes a,b insatures. Dans les dernieres annees beaucoup d'efforts ont ete realises pour trouver le catalyseur performant pour l'hydrogenation de la fonction carbonyle dans le crotonaldehyde (molecules modele). Mais, jusqu'a present il n'existe pas de procede de catalyse heterogene capable de donner 100% d'alcool crotylique dans l'hydrogenation du crotonaldehyde. Nous avons etudie l'hydrogenation du crotonaldehyde en phase gaz, a pression atmospherique d'hydrogene sur des catalyseurs a base de palladium ou de platine, supporte sur oxyde de zinc ou sur chlorure de zinc depose sur silice, prepares par la methode d'impregnation du support par les sels metalliques. Ces catalyseurs, apres avoir ete calcines sous air et reduits sous hydrogene a differentes temperatures sont testes en reactivite catalytique. Les pr...
Synthesis of gold nanoparticles has attracted much attention since the pioneering discovery of th... more Synthesis of gold nanoparticles has attracted much attention since the pioneering discovery of the high catalytic activity of supported gold nanoparticles in the reaction of CO oxidation at low temperature. In this research field, we used Na-montmorillonite for gold nanoparticles stabilization; various gold loading percentage 1, 2 and 5% were used for gold nanoparticles preparation. The gold nanoparticles were obtained using chemical reduction method using NaBH4 as reductant agent. The obtained gold nanoparticles stabilized in Na-montmorillonite were used as catalysts for the reduction of 4nitrophenol to aminophenol with sodium borohydride at room temperature. The UV-Vis results confirmed directly the gold nanoparticles formation. The XRD and N2 adsorption results showed the formation of gold nanoparticles in the pores of montmorillonite with an average size of 5 nm obtained on samples with 2% gold loading percentage. The gold particles size increased with the increase of gold loadi...
The influence of the protecting agent’s nature on gold particle size and dispersion was studied i... more The influence of the protecting agent’s nature on gold particle size and dispersion was studied in this work over a series of gold-based catalysts. CO and glucose oxidation were chosen as catalytic reactions to determine the catalyst’s structure–activity relationship. The nature of the support appeared to be the predominant factor for the increase in activity, as the oxygen mobility was decisive for the CO oxidation in the same way that the Lewis acidity was decisive for the glucose oxidation. For the same catalyst composition, the use of montmorillonite as the stabilizing agent resulted in better catalytic performance.
Mixed copper-zinc catalysts supported on silica were prepared by incipient wetness impregnation o... more Mixed copper-zinc catalysts supported on silica were prepared by incipient wetness impregnation of nitrate salt solution. The influence of the drying temperature on the properties of the final calcined and/or reduced material was investigated. It was shown ...
Mixed copper−zinc catalysts supported on silica were prepared by incipient wetness impregnation o... more Mixed copper−zinc catalysts supported on silica were prepared by incipient wetness impregnation of nitrate salt solution. The influence of the drying temperature on the properties of the final calcined and/or reduced material was investigated. It was shown that, as in the case of monometallic Cu or Zn systems, after a drying step performed at 25 °C, the nitrates are still present as an amorphous compound, whereas the drying step at 90 °C led to the formation of a poorly crystallized hydroxynitrate compound. From XRD and DTG measurements, it was concluded that the hydroxynitrate compound in the mixed systems is a copper−zinc hydroxynitrate [Cu2−xZnx(OH)3(NO3)] in which the two cations are closely associated. After reduction at 350 °C, a “memory effect” of the drying step was observed, and the intermediate formation of the mixed hydroxynitrate led to a better interdispersion of Cu0 and ZnII in the reduced material than when drying was performed at room temperature. This is attested by the higher selectivity...
In this work, carbon nanofibers (CNFs) have been successfully functionalized by using different a... more In this work, carbon nanofibers (CNFs) have been successfully functionalized by using different approaches and finally used for the preparation of Ru based catalysts.
Cotton stalks-based biochars were prepared and used to synthetize Ru-supported catalysts for sele... more Cotton stalks-based biochars were prepared and used to synthetize Ru-supported catalysts for selective production of γ-valerolactone from levulinic acid in aqueous media. Different biochars’ pre-treatments (HNO3, ZnCl2, CO2 or a combination of them) were carried out to activate the final carbonaceous support. Nitric acid treatment resulted in microporous biochars with high surface area, whereas the chemical activation with ZnCl2 substantially increases the mesoporous surface. The combination of both treatments led to a support with exceptional textural properties allowing the preparation of Ru/C catalyst with 1422 m2/g surface area, 1210 m2/g of it being a mesoporous surface. The impact of the biochars’ pre-treatments on the catalytic performance of Ru-based catalysts is fully discussed.
Abstract A series of -SO3R functionalized activated carbons (R=H, O, aryl) were prepared and appl... more Abstract A series of -SO3R functionalized activated carbons (R=H, O, aryl) were prepared and applied in fructose dehydration reaction to 5-hydroxymethylfurfural. Different sulphonating methods introduce groups on catalyst surface with distinct donor-acceptor and hydrophilic properties. Their nature influences significantly not only activated carbon’s textural and chemical properties but also the product yields and selectivity in fructose dehydration reaction. The viability of the solvent free reaction was also investigated and compared to the performance of the catalyst series in presence of DMSO, where the best catalytic results were obtained.
Les alcools a,b insatures sont des produits tres importants en synthese organique, ils peuvent et... more Les alcools a,b insatures sont des produits tres importants en synthese organique, ils peuvent etre obtenu par hydrogenation selective des aldehydes a,b insatures. Dans les dernieres annees beaucoup d'efforts ont ete realises pour trouver le catalyseur performant pour l'hydrogenation de la fonction carbonyle dans le crotonaldehyde (molecules modele). Mais, jusqu'a present il n'existe pas de procede de catalyse heterogene capable de donner 100% d'alcool crotylique dans l'hydrogenation du crotonaldehyde. Nous avons etudie l'hydrogenation du crotonaldehyde en phase gaz, a pression atmospherique d'hydrogene sur des catalyseurs a base de palladium ou de platine, supporte sur oxyde de zinc ou sur chlorure de zinc depose sur silice, prepares par la methode d'impregnation du support par les sels metalliques. Ces catalyseurs, apres avoir ete calcines sous air et reduits sous hydrogene a differentes temperatures sont testes en reactivite catalytique. Les pr...
Synthesis of gold nanoparticles has attracted much attention since the pioneering discovery of th... more Synthesis of gold nanoparticles has attracted much attention since the pioneering discovery of the high catalytic activity of supported gold nanoparticles in the reaction of CO oxidation at low temperature. In this research field, we used Na-montmorillonite for gold nanoparticles stabilization; various gold loading percentage 1, 2 and 5% were used for gold nanoparticles preparation. The gold nanoparticles were obtained using chemical reduction method using NaBH4 as reductant agent. The obtained gold nanoparticles stabilized in Na-montmorillonite were used as catalysts for the reduction of 4nitrophenol to aminophenol with sodium borohydride at room temperature. The UV-Vis results confirmed directly the gold nanoparticles formation. The XRD and N2 adsorption results showed the formation of gold nanoparticles in the pores of montmorillonite with an average size of 5 nm obtained on samples with 2% gold loading percentage. The gold particles size increased with the increase of gold loadi...
The influence of the protecting agent’s nature on gold particle size and dispersion was studied i... more The influence of the protecting agent’s nature on gold particle size and dispersion was studied in this work over a series of gold-based catalysts. CO and glucose oxidation were chosen as catalytic reactions to determine the catalyst’s structure–activity relationship. The nature of the support appeared to be the predominant factor for the increase in activity, as the oxygen mobility was decisive for the CO oxidation in the same way that the Lewis acidity was decisive for the glucose oxidation. For the same catalyst composition, the use of montmorillonite as the stabilizing agent resulted in better catalytic performance.
Mixed copper-zinc catalysts supported on silica were prepared by incipient wetness impregnation o... more Mixed copper-zinc catalysts supported on silica were prepared by incipient wetness impregnation of nitrate salt solution. The influence of the drying temperature on the properties of the final calcined and/or reduced material was investigated. It was shown ...
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