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2 International Letters of Chemistry, Physics and Astronomy

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Enhancement the Octane Number of Sudanese Gasoline (Nile Blend)

Sedahmed O., Duaij Omar K., Taha K. K.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 48

184--193

Gasoline is one of most important sources of energy but when manufactured with low octane number may leave great risk that affect the human health and environment impact. Therefore processes of gasoline production must be developed. Zeolite material dependence on their extremely high frame work extended interactive surface, ability to interact with molecule and cations. They show a wide variety of interesting properties which result in remarkable applications in the fields of catalysts, gas separations, selective adsorption and water softening. Zeolite catalyst loaded with finely (Sr) metal have been used in hydro-cracking, catalytic cracking. The zeolite used is the synthetic zeolite (type Y) has high thermal stability, good surface area and its heterogeneous catalyst which can be separated after treatment and may be reactivated. The study of the octane number was carried out for this zeolite. The gasoline was obtained from market (commercial gasoline) it has octane number 91.7 determined by IROX-2000.The gasoline was treated by zeolite in the temperature about 331 Kelvin. The synthetic zeolite (type-Y) raised the octane number (from 91.7 to 92.4).

Inhibition of Brass Corrosion in Acid Medium Using Thiazoles

Taha K. K., Mohamed M. E., Khalil S. A., Talab S. A.

International Letters of Chemistry, Physics and Astronomy

2013

Vol. 9, iss. 2

87-102

Brass as an alloy composed mainly of copper is great industrial uses such as heat exchangers and similar other facility due to its good thermal properties. Due to the presence of the considerable ratio of zinc the alloy suffers from zinc dissolution or dezincification. Dezincification rate increases with the increase in the ratio of zinc in the alloy. In this study benzothiazole (BTH) and its substituent’s 2-methylbenzothiazole (MeBTH), 2-aminobenzothiazole (ABTH), 2-mercaptobenzothiazole (MBTH) and 2-phenylbenzothiazole (PhBTH) have been used as corrosion inhibitors for α-brass in stirred 0.1 M HClO4. The methods of investigation include weight loss, Tafel and linear polarizations and electrochemical impedance spectroscopy. The order of inhibition efficiency (% E) was calculated and the values obtained has indicated the sequence of inhibition efficiency was found to be BTH < MeBTH < ABTH < PhBTH < MBTH. The calculated values of thermodynamic parameters support this order. The inhibitors were found to suppress the corrosion rate by the formation of films which were identified by IR, SEM and EDAX techniques.