Sellam Mohamed

11 Questions 9 Answers 0 Followers

Questions related from Sellam Mohamed

Why we use sodium aluminate and sodium silicate rather than alumina and when synthesizing zeolites ?

In the chemical composition of zeolites the formula is written with alumina Al2O3 and silica SiO2 while in the synthesis sodium aluminate NaAlO2 and sodium silicate Na2SiO3 are used.

04 March 2024 2,441 1 View

For a sample of zeolite which has undergone heat treatments but does not present any peak however gave an acceptable yield during reaction?

For a sample of zeolite which has undergone heat treatments (ion exchange, impregnation) presents a drx diagram without peaks, but during the reaction gave an acceptable yield; explanations thank you.

01 March 2023 1,212 2 View

When the porous volume of a zeolite decreases following heat treatments does this mean that cristallinity diminishes?

Hy everyone, i would like to know when the porous volume of a zeolite diminshes following heat treatments such as ion exchange and impregnation does this mean that we lose some of its...

23 February 2023 4,019 2 View

When the pore volume of a zeolite decreases does this mean that the crystallinity decreases ?

Hy everyone, i would like to know when the porous volume of a zeolite diminshes does this mean that we lose some of its cristallinity? thanks for answering to my question please....

20 February 2023 8,904 4 View

Why we use sodium aluminate and sodium silicate rather than alumina and when synthesizing zeolites ?

in the chemical composition of zeolites the formula is written with alumina Al2O3 and silica SiO2 while in the synthesis sodium aluminate NaAlO2 and sodium silicate Na2SiO3 are used.

25 May 2022 2,462 2 View

Hello, could anyone explain to me what do we mean by XRD % ?

hello, I can't understand what a (% XRD vs time ) could mean in some graphs...!!!!

09 November 2021 1,000 7 View

How can identify a peak which doesn't match with highscore database software like other peaks ?

hi, i have one peak in my spectra doesn't match with any highscore data base, all other peaks are well identified; please would you mind helping me to fix and therefor identify that peak. thanks...

25 October 2021 9,952 6 View

Hi everyone ; please is there any possibility to synthesize metalic alloys (such as FeCrNi) powders via sol-gel method ?

Im asked to elaborate multi-constituent (FeNiCr based) alloys by using the sol-gel process, i did not find papers or reaserches to initiate and guide me on this theme to perform this task, please...

27 April 2021 5,654 3 View

Hello everyone ! please would you mind providing me tutorials and details in how applying rietveld method mainly by using X'pert highscore ?

I have hard time to manipulate X'pert highscore when applying rietveld refinement method over powders ,probably missing of data base or something else ! I have only PDF2 as databse. thank you...

22 September 2020 6,353 2 View

Please could anyone provide me a technical differences between colloidal silver and ionized silver in terms of toxicity ?

It's thought that ionized silver is better than silver nanoparticles !!!

11 May 2020 3,275 11 View

How can we get the right composition of the alloy after beeing sythesised via mechanical alloying process?

After the elaboration of different alloys; for instance FeNi i can't really get the appropriate composition of each single element 'EDS gave me a confused compositions. Different from what i have...

08 March 2020 4,266 4 View