2024-02

International Journal of Environmental Analytical Chemistry (Issue : 1) (Volume : 1)

In this study, a novel photocatalyst, Cu&Ni@FAU Faujasite type zeolite, was successfully prepared and characterised using various techniques, including XRD, SEM-EDX, FTIR, N2 adsorption-desorption isotherm, and UV-Vis spectrophotometry. Cu&Ni@FAU enhances the photocatalytic efficiency through several mechanisms, including the photo-Fenton-like process of H2O2, the electronic capture of KBrO3, and the reducing effect of NaBH4. Response surface methodology has been applied to study the impact of H2O2, KBrO3, and NaBH4 and their interactions on the photocatalysis of tetracycline. Furthermore, the efficiency of the photocatalysts and their kinetics were assessed for four different organic molecules, and it was found that the rate constant of tetracycline degradation was 0.054 M−1min−1. It is worth mentioning, Cu&Ni@FAU is temperature stable and shows maximum degradation at 70°C. Radical trapping experiments revealed that various reactive species played a role in the photodegradation process. The results show that hydroxyl radicals (OH•) and superoxide radicals (O2-•) are the dominant species in the photocatalysis mechanism. Additionally, electrons (e-) and holes (h+) had a moderate impact as active species, since the band edges of Cu&Ni@FAU is located between 2.86 eV at valance band (VB) and −0.38 eV at conduction band (CB).. To gain deeper insights into these processes, the study used density functional theory (DFT) simulation, which allowed for the calculation of electronic and vacuum band edges. This computational approach likely provided valuable information about the fundamental processes occurring during the photocatalysis process.

2023-07

Science Journal of University of Zakho (Issue : 3) (Volume : 11)

This study investigates, for the first time, the effects of dealumination of binder-free NaY type zeolite on the adsorption properties and porous structure characteristics. In this study, BF-Y zeolite was hydrothermally synthesized from kaolin and powder NaY. BF-Y was then treated with acid to increase Si/Al ratio. X-ray Diffraction (XRED), Thermal Gravimetric Analysis (TGA), Scanning Electron Microscope (SEM), and Energy Dispersive X-Ray (EDX) have been performed for the characterization. The modified zeolite granules MBF-Y were used as an adsorbent for the removal of methylene blue MB dye from water. The influence of initial MB concentration, contact time, temperature, and adsorbent dosage on adsorption capacity and dye removal percentage on MBF-Y was investigated. The maximum dye removal was attained at a concentration of (8 * 10-6 M) which was more than 93%, and an equilibrium contact time of 60 minutes. Well-known adsorption isotherms (Langmuir, Fruendlich, and Tempkin) were used to study the adsorption mechanism of MB onto MBF-Y.

2021-05

IEEE Xplore

Most of the methods described in the literature for the preparation of pentasil-containing catalysts involves the synthesis of highly dispersed zeolite ZSM-5 in the required cation-decationized forms and subsequent molding in a mixture with a binder material into granules. Information on available and promising for industrial implementation methods for the synthesis of granular materials based on high crystallinity ZSM-5 zeolite with a hierarchical porous structure is absent in the literature. As a result of the studies, a method for the synthesis of granular zeolite ZSM-5 of high phase purity and degree of crystallinity of −100% using tetrabutylammonium bromide as a template was proposed. The method includes the stages of mixing powdered zeolite ZSM-s5 and amorphous alumino silicate, moistening the mixture with water and mechanical granulation, drying and crystallizing the resulting granules. Chemical and X-ray …

2020-04

International Research Journal of Pure and Applied Chemistry (Issue : 4) (Volume : 21)

Evaluation of crude oil and its residue using derivatography, is one of the most common physical and chemical methods analytical research. Crude oil residues 350+ obtain from two Iraq-Kurdistan crudes (Tawke T-21A well and Shekhan PF2 well) by using atmospheric distillation after removing all volatile fractions. The sample characterized by direvatographic method. The thermo analysis, reactions were carried out at temperature range 20- 700℃ for reaction time 68 min. These derivatograph curves show the weight change and heat energy (Enthalpy) change as the function of time and temperature. It shows that the crude oil residues have different composition. The curve which marks the weight changes of the sample heated is the thermogravimetric curve, TGA. Whereas the curve, which records heat energy or enthalpy changes during thermal decomposition is the DTA or differential thermoanalytic. By means of the derivatograph, it is possible to record simultaneously curve of weight change (TG), and enthalpy change (DTA) as a function of temperature. This method analysis shows good evaluation of these two crude oil well.

2020-03

Sjuoz (Issue : 1) (Volume : 8)

In this work, it is shown that based on powder zeolite type Y, mono metallic and bimetallic catalysts have been developed that are promising for petroleum chemistry processes. The method is based on the preparing hydrogen form of Y zeolite by ion exchange with a solution of ammonium nitrate at a starting concentration of 70 g.l-1 and nickel nitrate solution which provides Ni cations. Then after preparation of bimetallic catalysts by impregnating second metal by incipient wetness. All samples and catalysts were characterized using X-ray diffraction (XRD) analysis techniques, adsorption methods, and elemental analysis. The research results showed that in order to reach the degree of exchange of Na+ for H+ cations no less than 0.73, it is necessary to carry out four exchanges of Na+ by NH4+ and three intermediate thermal treatments at 540 °C for 3 to 4 hours in air atmosphere.

2016-01

Petroleum Chemistry (Issue : 1) (Volume : 56)

A catalyst has been prepared as binder-free shaped MOR-type zeolite in the H form promoted with 0.5 wt % platinum, and n-hexane conversion over this catalyst has been studied. It has been found that the selectivity for C4–C6 isoparaffins on the new catalyst is about 90% at 300°C, a feed space velocity of 1.5 h–1, and a hydrogen pressure of 3 MPa, with the hexane conversion being 80.0–83.0 wt % and the selectivity for isohexane making 83.0–86.0%. It has been shown that the new catalyst is stable for 50 h on-stream under these conditions.

2014-03

Petroleum Chemistry (Issue : 2) (Volume : 54)

The effect of the preliminary holding of the BS-100 “white soot” at 150–155°C for 6 to 7 h and the crystallization conditions on both the characteristics of powdered MOR zeolite samples (degree of crystallinity, composition, particle size composition, and adsorption of C6H6 molecules) and their catalytic properties in the α-methylstyrene dimerization reaction has been studied.

2012-10

Electronic scientific journal Oil and Gas Business (Issue : 2) (Volume : 2)

For the first time the synthesis method of powdery mordenite type zeolite based on crystallization of metakaolin in sodium silicate solution at temperature 150 °C for 14 hours is developed. The zeolite having 100 % crystallinity degree crystallized from the reaction mixture (RM) with the composition 2,9Na2О ∙ Аl2О3 ∙ 12SiО2 ∙ 300H2O. Previously 10 wt. % crystal seed was introduced in RM, crystallization was carried out under continuous stirring. Implementation of the developed method allows to extend the raw materials base, simplify the synthesis and reduce the cost of powdery mordenite type zeolite.

2012-10

International Journal of Materials Engineering (Issue : 6) (Volume : 2)

Samples of crystalline aluminosilicate, the granules of which are crystalline aggregates of zeolite X with different degrees of exchange of cations Na+ for cations Ca2+, Mg2+, К+ or Н+ were synthesized. Based on obtained samples, the adsorption of Н2О, СО2, С6Н6 and n-С7Н16 in static and dynamic modes is studied. The dependencies of the amount of adsorbed substance on the type and content of exchangeable cations in zeolite X were found.

2008-10

National Journal of Chemistry (Volume : 31)

In this research work we aimed to graft lignin which a naturally oxygenated compound with different ratio of oxidized asphalt (contains synthetic oxygenated groups). Grafting aimed to allow the two type of the functional groups to react in the presence of small amount of base. The process conducted at 300 oC in the absence of air. Carbonization of the mixture was carried out in the presence of twice the amount of sodium hydroxide and at a temperature of 450-500 oC till no more gases evolved. The product carbon was activated by refluxing with 30% HCl. Evaluation of the activated carbon was conducted by adsorption of iodine and methylene blue. Other variables such as density, humidity, ash and surface area were also determined.