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TGA-DSC: A Scr.ening Tool for.the Evaluation of Hydr.cr.cking Catalyst Per.or.ance

Amer.can Jour.al of Analytical Chemistr. 2015年第4期6卷 364-375页

作者： Muhammad Salman Shazia Nisar.Zahid Hussain Hina Salman mohib r. kazimi Depar.ment of Chemistr. University of Karachi Karachi Pakistan Institute of Chemistr. Inter.ational Center.for.Chemical and Biological Sciences University of Karachi Karachi Pakistan Depar.ment of Applied Chemistr. and Chemical Technology University of Karachi Karachi Pakistan

DSC-TGA was used for.scr.ening of commer.ially available and synthesized catalyst for.the degr.dation of polypr.pylene (PP). In this study, all the r.ns wer. per.or.ed with 50% load of the catalyst and the r.sults wer. compar.d with those of PP + 50% pur. silica having no catalytic activity. The degr.dation behavior.of PP using catalyst Zeolyst-713 exhibited much higher.degr.dation activity among the other.catalysts used in this study. Mor.over. it contr.buted to lower.ng of initial stage temper.tur. showing a shape-selective effect. DSC-TGA tools such as Ton, Tmax, T99%, activation ener.y, enthalpy change in the pr.cess and coke content wer. used for.scr.ening. It was concluded that the por. constr.ction and unique acid pr.per.ies of the Zeolyst-713 as well as pr.per.r.action temper.tur.s wer. significant influential factor. to fully exer. this effect. In this wor., kinetics of catalytic ther.ogr.vimetr.c degr.dation of PP used for.domestic pur.oses was investigated using Alumino-silicate catalyst. Zeolyst-713 was obser.ed to lower.activation ener.y and enhances degr.dation activity in compar.son with ther.al degr.dation without a catalyst.

关键词： Ther.ogr.vimetr.c Analysis (TGA) DSC Pyr.lysis Catalytic Degr.dation Polypr.pylene Waste Plastic Catalysis

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Investigation of Ir.n Complex For.ation of Anti-Hyper.ensive Dr.g: Methyldopa

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Amer.can Jour.al of Analytical Chemistr. 2015年第6期6卷 551-558页

作者： Tehmina Fiaz Nasr.en Fatima S. Zafar.Abbas Zaidi Tanveer.Abbas mohib r. kazimi Depar.ment of Chemistr. University of Karachi Karachi Pakistan Depar.ment of Micr.biology University of Karachi Karachi Pakistan Depar.ment of Applied Chemistr. and Chemical Technology University of Karachi Karachi Pakistan

The dr.g administer.d for.any disease may play an unwanted function in biological system. They may have multiple counter.effects, one of which is their.inter.ction to bioactive metals. Ir.n is most common bio essential metal and is r.por.ed to inter.ct with antihyper.ensive dr.g methyldopa. In the pr.sent study, above said complex is analyzed by UV-Visible spectr.photometr.. For.ation constant of the complex is calculated by using mole r.tio method and single point statistical method which is in the r.nge of 1010, values ar. also calculated which ar. independent of pH like for.ation constant. Absor.ance maxima wer. found to be dependent on pH. At lower.pH complex shows two br.ad bands center.d at 430 nm and 730 nm. With the r.se in pH later.peak shifts towar. lower.wavelength, so 615 nm is selected for.fur.her.studies. Molar.extinction coefficient of the complex is explor.d by ser.al dilution method. At all wavelengths it incr.ases with incr.ase in pH. Mole r.tio and slope r.tio methods ar. used for.explor.ng stoichiometr.. Metal to ligand combining r.tio in the complex is 1:2 at pH 4.0 and pH 4.5 while 1:3 at pH 5.0 and pH 5.5.

关键词： Ir.n Methyldopa Stoichiometr. For.ation Constant UV-Spectr.photometer.

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