Eliezer Ladeia Gomes

9 Questions 13 Answers 0 Followers

Questions related from Eliezer Ladeia Gomes

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

Zeolites A and P often appear in standard syntheses. How does sodium sodium affect the construction of the phase?

08 August 2019 6,928 3 View

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.

05 May 2019 4,597 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.

11 November 2018 6,932 7 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.

11 November 2018 4,144 2 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...

05 May 2018 4,419 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?

04 April 2018 8,146 2 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...

03 March 2018 7,414 0 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...

03 March 2018 4,918 4 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 6,384 0 View