Tunis, Tunisia
Tunis, Tunisia

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Tounsi H.,Campus Universitaires | Tounsi H.,University of Sfax | Mseddi S.,Campus Universitaires | Mseddi S.,University of Sfax | And 2 more authors.
Materials Science Forum | Year: 2010

Na-LTA, Na-X and HS zeolites have been prepared from Tunisian sand and aluminum scraps. The alkaline attack of the sand leads to the metasilicate sol used as a source of silica. The aluminum source was prepared by dissolving aluminum in NaOH solution. The influence of several physicochemical parameters such as temperature, crystallization time and the alkalinity of the reaction mixture on the nature and the purity of the obtained products have been investigated. © (2010) Trans Tech Publications.

Tounsi H.,Campus Universitaires | Djemal S.,Campus Universitaires | Petitto C.,Charles Gerhardt Institute | Delahay G.,Charles Gerhardt Institute
Applied Catalysis B: Environmental | Year: 2011

Copper loaded hydroxyapatite prepared by ion exchange were characterized by XRD, FTIR, BET, UV-vis, H2-TPR and evaluated in the selective catalytic reduction of NO by NH3 under oxidizing atmosphere. The Cu-Hap catalysts, without the libethenite phase presence, have been found to be active, and selective in the NH3-SCR process. The highly dispersed CuO clusters on Ca-Hap surfaces were responsible for the NO conversion in the low temperature range in the NO-SCR with NH3. The presence of 2.5% of H2O in the feed mixture strongly affects the NO conversion in the whole temperature range. © 2011 Elsevier B.V.

Ouni R.,Campus Universitaires | Nefla A.,Campus Universitaires | Hili A.E.L.,Campus Universitaires | Nouira S.,Campus Universitaires
Alauda | Year: 2011

Nine Ardeidae species breed in Tunisia. About 2,5003,000 breeding pairs breed each year and more than 1 2,000 individuals winter. The breeding population includes 8 regular species: Grey Heron Ardea cinerea, Purple Heron Ardea purpurea, Black-crowned Night Heron Nyctkorax nycticorax, Cattle Egret Bubulcus ibis, Squacco Heron Ardeola ralloides, Little Egret Egretta garzetta, Little Bittern Ixobrychus minutus and Eurasian Bittern Botaurus stellaris (for the latter species, breeding is certain but no nest has been found). The Western Reef Egret Egretta gularis is a casual breeder. The Great Egret Casmerodius albus is present all the year round but no nesting has been found.

The search for mixed nocturnal roost sites of herons (Ardeola ralloides, Nycticorax nycticorax, Bubulcus ibis, Egretta alba, Egretta garzetta and Ardea cinerea) took place between 1999 and 2009 in different types of habitat from the North to the South of Tunisia. The information gathered at the 44 nocturnal roost sites during the 956 observation sessions in 10 years totals 171140 records. Monitoring on the ground has allowed us to know: the habitat chosen, the periods and frequency of use, the behaviour at the roost, the origin of the birds, times of arrival, sleeping, waking and departure of each species.

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