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Register a new userMethanol dehydration on alumina xerogel catalyst
نزع الماء من الميتانول على سطح حفاز من أكسيد الألمنيوم الاكسيروجل
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Added by
Aِl-Baath University ورقة بحثية
Publication date
2017
fields
Chemistry
and research's language is
العربية
Authors
ريم طليمات( باحث )
Created by
Shamra Editor
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تم في هذا البحث إجراء تفاعل نزع الماء (بلمهة) من الميتانول لإنتاج ثنائي ميتيل ايتر على سطح حفاز من أكسيد الألمنيوم المحضّر بطريقة ال Xerogel ذو مسامات مكروية و غير متبلور و ذو سطح نوعي مرتفع m2/g 475 .
In this research a reaction of dehydration of methanol to dimethyl ether on a microporous amorphous alumina xerogel catalyst was studied. The catalyst possess a high surface area (475 m2/g).
References used
F.Yaripour, F.Baghaei, I.Schmidt, J.Perregaard Catalysis Communications, Volume 6, Issue 2, February 2005, Pages 147-152
Dongsen Mao, Weimin Yang, Jianchao Xia, Bin Zhang, Guanzhong Lu. Journal of Molecular Catalysis A: Chemical, Volume 250, Issues 1-2, 2 May 2006, Pages 138-144
N.P.Makgoba, T.M.Sakuneka, J.G.Koortzen, C. Van Schalkwyk, J.M.Bothan, C.P.Nicolaedes Applied Catalysis A: General,Volume 297, Issue 2, 6 January 2006, pages 145-150
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The Xerogel alumina catalyst was prepared by sol-gel
method in non-aqueous milieu, and the aerogel alumina
catalyst was prepared in the same method but it was dried at
by supercritical conditions. These catalysts were characterized
by XRD, BET, a
nd chemical adsorption methods. The
obtained results were compared to show the effect of
preparation process on the structural properties of the alumina.
Besides these results were compared with some oxides
supported on alumina, and the effect of distribution of these
oxides on the properties of alumina was investigated too.
In this study, we review the possibility of production both ethanol and methanol from
OMW(OMW: Olive Mill Wastewater), fermented using pathogenic bacteria and isolated
marine bacteria. The results showed that when using Salmonella sp. bacteria, the
highest
values of methanol (5658.308 μg /l) appear at 7.5% concentration of the OMW, and the
higher concentration of ethanol (49.132 μg/l) at a concentration of 17.5% fermentation of
OMW. While Pseudomonas sp. produced the highest concentration of methanol (603.76μ
g/l) and ethanol (688.71μg /l) at 17.5% for OMW.
The results of this research showedthe ability of the bacteria isolated from sea water
in producing the above mentioned alcohols; for example the X3 bacteria displayed a direct
correlation between high concentrations of OMW (15 , 35 , 50)% and the high
concentrations of produced methanol (UL, 130.406μg/l, 1353.244μg/l ), apposite to
ethanol which was under the detection limits (under limited: UL).
The Arak and Wine are common alcoholic spirits in Syria. However, those spirits are often produced outside the controls of the manufacturing cycle in terms of fermentation and distillation, thus exposing the consumers to risk of methanol poisoning, w
hich confirms the need to submit their production to the control as extremely essential. The aim of this study to determination of methanol in some alcoholic beverage prepared by traditional local methods in order to verify conformity of local Alcohol Syrian standard specification. The samples were tested by using colorimetric method as official methods depending on the measurement using spectrophotometer at (575 nm).In comperation with the standard Syrian specifications number /2478/ year (2003), there were fifty test samples (Arak and Wine) collected from locally available. The study showed the amount of variation in the concentration of methanol depending on the difference in the method of preparation fermenting grapes. furthermore the importance of applying the control system to provide the quality of those popular spirits.
The work could be considered as a continuous study of (XRL) X – ray luminescence - spectra of pure, and mixed Zno different AL ions, In these films and other crystals powders prepared by new developed te chnology.
We studied the pure and ZnO thin
films. mixed with an AL - ions in the fielol (200-700)nm ,at different weig hrs (5,10,15,20)wt% prepared by thermal evaporation. This way is cheep and a simple technology.
Our study showed different spectra peaks at the wavelengths(335,410,521)nm anol (t=20ns)produced, at different peaks intensities of the prepared thin films, compared with those jure and mixeol ZnO ones, spray pyrolysis.
Thin films technology, have many wide scientific application, in the medical field, Lazer technology, Luminscence counters, and at the solar cells fields
Mineralogical
studies were made to identical the components of the catalyst, montmorillonite
and phylippsite and others were observed. The DTA diagrams indicated
characteristic indothermal and exothermal reaction. The adsorption –
desorption of N
2 measurements were carried out at -196°C. A slight decrease of
surface area after having the catalyst been covered with Ag2O.
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