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Register a new userpreparation, characterization of sulfated Alumina_Zirconia system
تحضير و توصيف الجملة ألومينا_زركونيا المحملة بالكبريتات
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Tishreen University ورقة بحثية
Publication date
2017
fields
Chemistry
and research's language is
العربية
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Shamra Editor
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حُضرت ثلاث عينات من الأكسيد المشترك ألومينا_زركونيا بنسب مختلفة ZrO2:Al2O3: 0.1; 0.25; 1 و ذلك بطريقة المزج الميكانيكي للهلامات الألومينا و الزروكنيا المرسبة من محاليلهما المائية باستخدام محلول الأمونيا كعامل مرسب. تُرك المزيج للترقيد لمدة 24 ساعة. رُشحت العينات المحضرة و غُسلت بالماء القطر لتمام التخلص من الأنيونات المرافقة, و من ثم جُففت عند الدرجة C°120 لمدة 24 ساعة. ثم تحميل العينات المحضرة بأيونات الكبريتات بنسب مختلفة %(5,10) بطريقة النقع (التشريب) باستخدام كبريتات الأمونيوم كمصدر لأيونات الكبريتات و تُركت العينات لمدة 24 ساعة مع التحريك. جُففت العينات الناتجة عند الدرجة C°120 لمدة 6 ساعات ثم كُلست عند الدرجة C°550 لمدة 3 ساعات.تم تعيين خواص البنية النسيجية للعينات المحضرة من خلال معالجة بيانات امتزاز غاز الآزوت عند الدرجة 77K, و تبين أن هذه الخواص تتغير بتغير نسبة الزركونيا و الكبريتات المحملة, و دراسة الثبات الحراري للعينات من خلال منحنيات التحليل الحراري التفاضلي TG_DTA التي أظهرت ثباتاً حرارياً للعينات المحضرة عند درجات حرارة عالية, كما دُرست العينات المحضرة باستخدام تقانة الأشعة تحت الحمراء IR. التي بينت وجود مجموعة الكبريتات السطحية في العينات المحضرة.
Three samples of alumina_zirconia mixed oxid AL2O3_Zr2O4(1;0.25;0.1) mole ratio based on oxides were prepared by sol-gel precipition method. The system AL2O3_Zr2O4 was obtained by mixing tow gel of alumina and zirconia precipited from aqueous solutions of alumina nitrate and zirconium chlorid using ammonium hydroxide solution as precipited agent. The system after mixing was allwed to settle for 24 h. The resuling precipitate was filtered off and washed several times with deionized water and dried at 120°C for 24 h. The powdered oven-dried hydrous alumina_zirconia was immersed in ammonium sulfate solution(1) M for 24 h to incorporate sulfate ions. The resulting sample was dried at 120° C for 24 h, calcined at 550°C for 6 h. The textural properties were determined by terating of adsorption data of N2 at 77 K, and the results showed the changings in the textural properties.The TG_DTA analysis showed the thermal stable of the samples in a long rang of temperature. FTIR spectra showed that the sulfate ions were incorperated in the saples.
References used
ARATA.K .Preparation of superacids by metal oxides for reactions of butanes and pentanes. Appl .Catal . A: Gen . (1996) .146 .3
NAYEBZADEH.H;SaGHATOLESLAMI.N; MASKOOKI.A ; and VAHID.B. R. Preparation of Supported Nanosized Sulfated Zirconia by Strontia and Assessment of Its Activities in the Esterification of Oleic Acid .Chem. Biochem. Eng. Q., (2014) . 28 (3) 259– 265
YOSHIO ONO ; HIDESHI HATTORI . Preparation and Catalytic Properties of Solid Base Catalysts — I. Metal Oxides . Springer Series in Chemical Physics . (2011) .101 .69_159
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Some samples of alumina supporting with sulfate ions and molybdenium were
prepared by impregnation method. Supported samples were calcinated at 550°C for 6h.
Presence of sulfate ions and molybdenium lead to decreasing of the specific surface area o
f
alumina, and in the ease of molybdenium the decreasing value was higher. The total pore
volume was decreased with the pore size was increased. XRD patterns showed that the
incorporation of sulfate ions and molybdenium did not affect crystalin structure of
alumina. FTIR spectra showed the bonding between sulfate ionsmolybdenium
and
alumina. The TG-DTA studies showed that the losses mass was decreased when the sulfate
ions and molybdenium were incorporated, sulfate ions and molybdenium oxide
decomposed at ~700°C and ~800°C respectively .
يعد الميتانول و الإيتانول من أكثر المحلات شيوعاً، و بما أن درجة غليانها أقل من مئة
درجة مئوية فإنها تتطاير بشكل سريع. و على سبيل المثال، يستعمل الميتانول في تصنيع
الأصبغة و العقاقير و العطور.. و هو شديد السمية، لذلك من الضروري تطوير محسات لكشفه.
أ
ما غاز الأمونيا فهو من ملوثات الهواء و له مصادر كثيرة مثل صناعة الأسمدة و أنظمة
التبريد.. و من هنا أهمية كشفه.
Quinaldine includes shifting hydrogenes which might be involved in
important reactions as the condensation and Mannich reactions.
Quinophtalone has been prepared through the reaction of quinaldine with
phtalyic anhydride in the presence of alumini
um chloride anhydrous
Imines derivatives have been prepared through the reaction of
Quinophtalone with hydroxideamine and phenyl hydrazine and then
diazotion anyhydride has been done to the resulting compounds.
The prepared compounds were characterized by ( H1NMR,IR, MS)
In this work, Rheological and mechanical properties of acrylonitrile –
butadiene – styrene/ corn starch composites (ABS/starch) were studied. The
composites were prepared using a laboratory scale single screw extruder.
Rheological properties were
determined using the single screw extruder, and
apparent shear rate (γ), apparent shear stress (τ), apparent viscosity (η), non-
Newtonian index (n) and flow activation energy at a constant shear rate (Eγ)
and constant shear stress (Eτ) were determined. Mechanical properties in term
of tensile tests were performed using Testometric M350-10KN, stress at break,
strain at break and Young's modulus were determined. Rheological results
showed that the composites are pseudo plastic in behavior, and the apparent
viscosity of the composites increases with increasing starch content above the
additive rule which indicates a partial compatibility in the composite, also it
was found that the flow activation energy of the composite increases with
increasing starch content. Also it was found that the activation energy value at
a constant shear stress is more than that at a constant shear rate. The
mechanical results showed that the strain at break of the composite decreases
sharply by the presence of starch, whereas the young's modulus increases with
increasing starch content.
The present research aims at synthesizing micro-porous and fluorescent polymer by microwave assisted synthesis allowing to reduce preparation time of 3 days at 180 °C using conventional method.
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