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

More Eliezer Ladeia Gomes's questions See All

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?

07 August 2019 6,821 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.

04 May 2019 4,530 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 4,043 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 6,860 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 4,345 7 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 4,853 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 7,345 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 6,298 0 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 View

What solvent can I used for Paal Knorr reaction between 6-amino hexanoic acid and 2.5 hexanedione?

I am try to make the Paal Knorr reaction between 2.5 hexnedione and 6-amino hexanoic acid, my problem is type of solvent to use, because 6-hexaminohexanoic acid is soluble in water but I am not...

02 March 2021 4,443 2 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 View

New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before?

Question to you and THEM, the New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before? There appears to be a core problem for...

02 March 2021 3,024 2 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

I am going to have 3 different probes in my qPCR work that I am going to do. But I realized that the machine we have in the lab is a Rotor-Gene Q 2plex HRM Platform, saying it has green, yellow,...

01 March 2021 8,544 1 View

Is CD44 degraded in lysosome together with hyaluronan after CD44 mediated endocytosis of hyaluronic acid?

Also when RHAMM binds hyaluronic acid, they get internalized, will RHAMM also be degraded? Or both CD44 and RHAMM will be transferred back to the cell membrane? Asking for breast cancer cell line...

01 March 2021 8,169 2 View

How to remove DCU and HOBT from my reaction?

I am doing a acid and a chiral amino alcohol reaction using DCC and HOBT in DCM or THF? Can anyone suggest me how to remove DCU and HOBT from a reaction mixture??

28 February 2021 2,153 1 View

What is the most common number of epitopes in an multi-epitope Vaccine?

hi everyone, I'm interested in the field of vaccine design specifically multi-epitope cancer vaccines , I want to know if there is a minimum and maximum number of epitopes we could use in a...

27 February 2021 3,882 3 View