In the synthesis of zeolite Y, how does sodium content interfere in the obtention of the desired phase?

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What's the effect of MgO impregnation over activated carbono on sugar clarification?

I'm trying to clarify sugar modifying activated carbon with diferentes oxides.

04 May 2019 4,638 2 View

I need to obtain an equation for calculation of pure urea in liquid phase. Has someone a refrence? Or a thermodynamic equation for this?

I'm developing a work that needs the density of pure liquid urea. It's liquid when the temperature is higher than 134 oC, but I didn't find references for this property.

10 November 2018 4,200 2 View

How to modulate the surface acidity of a zeolite in a stable manner for testing in gas phase alkylation reactions? Which dopants should be used?

I want to test zeolite catalysts in alkylation reactions for linear C6-C9 alkanes using with several exchanged metals. I want to use only one zeolitic support, but modulating its acidity.

10 November 2018 6,977 7 View

Are there specific models for adsorption / desorption of drugs in porous solids?

In studies of adsorption / desorption kinetics of drugs in zeolites, the kinetic models of 1st and 2nd order as in chemical kinetics give very similar results. Are there specific models for the...

04 May 2018 4,469 7 View

How to differenciate Bronsted acid sites in "nests" from isolated ones?

Is there a characterization technique to differentiate acidic sites of bronsted that accumulate in "nests" of those that are isolated? If so, how to differentiate and quantify them?

03 April 2018 8,184 2 View

Is it correct to use the infrared bands to calculate and monitor the evolution of crystallinity of zeolite gels?

We have prepared zeolites from gels with different aging times. The cristallinity is evaluated from the relationship between the intensity of 550 cm -1 band (ZSM-5) and the intensity of the silica...

02 March 2018 4,956 4 View

We've prepared MCM`s since 1999. There's a decrease of organization of very old calcined mesop. materials, despite of storage free of water. Why?

We have observed the decrease of organization of mesoporous materials that was stored for long periods is notorious. The calcined samples were stored free of water. Samples prepared several years...

02 March 2018 7,454 0 View

Do Ce-Zr solids in fuell cells present good proton conductivity? How to improve this property?

Ce-Zr can be synthesized by simple techniques. Good results in preparation and characterization indicate interesting possibilities.

01 January 1970 6,433 0 View

How to understand this crystallographic phenomenon of low temperature crystals in zeolite?

During low-temperature testing, new diffraction peaks that appear could be indicative of several phenomena. In one of our tests, we observed notable new peaks around 40° and 45° in a specific...

06 August 2024 726 3 View

I have calcined my catalysts without flowing air from the compressed air cylinder will there be any problem with my reaction if i use that catalysts?

FYI Catalyst is MFI zeolite Si/Al = 140,25.40.11.5,15 I am using this catalyst to study methanol to DME conversion

25 July 2024 2,486 2 View

Sodium azide in immunohistochemistry?

Hello everyone, A collaborator sent us his protocol in order to be able to use his immunohistochemistry kits. But one step contains PBS + 0.3% H2O2 + 0.1% sodium azide. Knowing the dangerousness...

23 July 2024 6,314 3 View

I want to buy Hydrothermal Synthesis Autoclave from any European company. Can anyone suggest any company inside Europe?

Thanks

22 July 2024 1,143 3 View

Hi dear researchers, do you suggest the best and shortest path for chemical synthesis and green synthesis of magnetite(Fe3O4)?

Suggest the best and shortest route for the chemical synthesis and and green synthesis of magnetite(Fe3O4) The chemical synthesis should contain the least dangerous chemicals along with full...

21 July 2024 2,476 2 View

Im trying iodination of an arene, but only getting black precipitates, is there anyone with iodination experience who can advise?

Organic Synthesis. My student has been trying iodination of arenes (our goal is to iodinate p-phenylenediamine) following these literature procedures: 1. Synthesis 2004, No. 11, 1869-1873 using...

16 July 2024 6,630 1 View

What could be the possible reason that sintering of polycrystalline diamond fabricated with tape casting has suddenly started failing?

I make polycrystalline diamond with tape casting followed by HPHT sintering. When i sintered the samples up till May, the sintering was good. When i sintered the samples in June and July at the...

16 July 2024 3,212 5 View

How to define a zeolite structure with rigid framwork?

Dear Gromacs users, I would like to simulate a zeolite-water system. In different literature, it is suggested to consider a rigid framework of zeolite to decrease the computational cost. I would...

15 July 2024 4,590 1 View

How do I prepare a working stock solution of 14C sodium bicarbonate to get a final activity of 3uCi?

I need to make a stock solution for radioisotopic incubations of freshwater sediments to study dark primary productivity but I have some confusion as to how I calculate the concentration of 14C...

15 July 2024 5,898 0 View

Validated HPLC method for the estimation of the Amphotericin B ?

During the release test of Amphotericin B using 1% Tween 80, i observed three peaks even in the standard. The first peak consistently yielded results around 500%, while the other peaks showed...

08 July 2024 1,330 0 View