Applied Science Private University

About: Applied Science Private University is a education organization based out in Amman, Jordan. It is known for research contribution in the topics: Population & Catalysis. The organization has 4124 authors who have published 5299 publications receiving 116167 citations.

Studies on addition of inclusions to molten aluminum using a novel technique

Abstract: Considerable initiatives have often been taken to introduce specific solid particles directly into molten metals in a desirable quantity, but little success has been achieved, particularly in the case of reactive particles. Therefore, alternative routes such as production of solid particles through chemical reactions within the melt are often used. While these methods are capable of producing solid particles within the melt, the chemistry of the melt changes and control of particle size and chemistry is difficult. In the present study, a direct addition technique has been used to introduce many types of inclusions into liquid aluminum and Al-Si alloys, irrespective of their wettability and chemical reactivity, while preserving the surface characteristics and melt chemistry. A uniform particle distribution can be obtained even at low volume fraction of addition and with particle sizes of the order of 2 to 5 µm. This technique allows valuable information regarding the behavior of many inclusions, such as TiB2, TiC, SrO, and Sr(OH)2, in liquid aluminum to be studied. Several such examples are presented.

Kinetics of the vapor‐phase oxidation of napthalene over a vanadium catalyst

Abstract: Rates of oxidation of naphthalene were measured for the temperature range 300°C. to 335°C. using a thin layer of vanadium oxide-potassium sulfate-silica catalyst in a flow reactor. The amounts of naphthalene converted were determined by analysing the products for 1,4-naphthoquinone, 1,2-naphtho-quinone, and phthalic anhydride. Negligible amounts of products of complete combustion were formed. The reaction rate data obtained at low conversions of naphthalene were correlated by the following expression, based upon a model for the reaction proposed by Hinshelwood: From the results of experiments in which the contact time was varied, it was suggested that the reaction course consisted of two parallel, consecutive reactions in which 1,4- and 1,2-naphthoquinone are intermediates in the formation of phthalic anhydride.

Synthesis of C-doped TiO2 by sol-microwave method for photocatalytic conversion of glycerol to value-added chemicals under visible light

Abstract: C-doped TiO2 photocatalyst synthesized using a one-step sol-microwave method with microcrystalline cellulose as the carbon source to achieve TiO2 of desirable visible light absorption, cluster size, surface area and band gap was applied in the photocatalytic oxidation of glycerol under visible light to produce value-added chemicals, for the first time. An increase in microwave irradiation time from 0 to 20 min reduced the anatase crystal size but increased the surface area, pore volume and pore radius. Carbon coupled with microwave treatment produced Ti3+ and oxygen vacancies in the TiO2 lattice of the C-doped TiO2 which yielded improved performance of the photocatalysts. For example, a cellulose loading at 10 % (i.e. 10 % Cel-TiO2(4-MW)) provided the highest photo-conversion of glycerol (67.5 %) and highest yields of glyceraldehyde (10.0 %), dihydroxyacetone (7.4 %), formic acid (49.0 %) and acetic acid (1.8 %). On the other hand, excess residual carbon on TiO2 surface (e.g. 20 % Cel-TiO2(0-MW)) retarded the activity of the photocatalyst.