نتایج جستجو برای: Phosphorus pentoxide used on alumina

تعداد نتایج: 9176077  

Negar Hormozinezhad Tayebeh Sanaeishoar,

Phosphorus pentoxide used on alumina (P2O5/Al2O3) as an inexpensive, eco-friendly and non-toxic acid catalyst for the one-pot synthesis of 1,8-dioxo-octahydroxanthenes via multi-component reactions under solvent-free conditions. The present approach offers several advantages such as short reaction times, high yields, easy purification, recovery and reusability of the catalyst.

Sara Roueen Tayebeh Sanaeishoar,

The condensation of aromatic aldehydes, dimedone, ethylacetoacetate and ammonium acetate promoted by was Phosphorus pentoxide supported on alumina carried out under solvent-free conditions to afford corresponding polyhydroquinolinederivatives. This method provides several advantages including highyields, low reaction times, easy work up and little catalyst loading.

Sara Roueen Tayebeh Sanaeishoar,

The condensation of aromatic aldehydes, dimedone, ethylacetoacetate and ammonium acetate promoted by was Phosphorus pentoxide supported on alumina carried out under solvent-free conditions to afford corresponding polyhydroquinolinederivatives. This method provides several advantages including high yields, low reaction times, easy work up and little catalyst loading.

2009
Junling WANG Yajun ZHANG Cuimin FENG Junqi LI Guibai LI

Experimental researches on adsorptive capacity of activated alumina, silica sand and anthracite coal for phosphorus were conducted. Results showed that performances of three filter media were all in line with Langmuir isotherm, and activated alumina adsorptive performance was much better than silica sand and anthracite coal for phosphorus removal. The adsorptive capacity of activated alumina, s...

2002
WEIWEI ZHUANG JOHN F. CONLEY YOSHI ONO DAVID R. EVANS R. SOLANKI

The paper will introduce a simple new method on the synthesis of both hafnium and zirconium nitrate precursors. The intermediate product, dinitrogen pentoxide produced from the water extraction from fume nitric acid via phosphorus pentoxide, was condensed by liquid nitrogen trap into a flask equipped with hafnium or zirconium tetrachloride. To give the high yield, the mixture of fume nitric aci...

Journal: :Journal of environmental chemical engineering 2022

Automotive catalysts can be exposed to various poisonous substances that cause physical or chemical deactivation. One of such poisons is phosphorous, which originates from lubricant oils. This study focuses on the phosphorus deactivation Pd/SSZ-13 used as a passive NOx adsorber (PNA). A clear caused by was observed, and it increased increasing content phosphorous. It concluded phosphorous both ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشگاه مواد و انرژی - پژوهشکده سرامیک 1392

thermal barrier coatings (tbcs) are used to provide thermal insulation to the hot section components of gas turbines in order to enhance the operating temperature and turbine efficiency. hot corrosion and thermal shocks are the main destructive factors in tbcs which comes as a result of oxygen and molten salt diffusion into the coating. in this thesis atmospheric plasma spraying was used to dep...

Journal: :The Biochemical journal 1955
A ALBERT C W REES

The isoniazid, after recrystallization from ethanol and drying over calcium chloride and then over phosphorus pentoxide, had m.p. 1700. Potentiometric titration with alkali (0.1 N-KOH), making use of the pK 10-8 (Albert, 1953) and ultraviolet spectrophotometry (at 262 m,u.), indicated a purity of 99.84%. This material was used to evaluate the published methods of iodometric titration. That cond...

Journal: :Journal of AOAC International 2002
Wei Min Yang Rhonda L Boles Thomas P Mawhinne

An inductively coupled plasma atomic emission spectrometry (ICP-AES) method was developed for the determination of phosphorus in fertilizers. Total phosphorus, direct extraction available phosphorus (EDTA), and water-soluble phosphorus, reported as phosphorus pentoxide (P205), in 15 Magruder check fertilizers were measured by ICP-AES, and the results were compared with those obtained by the AOA...

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