Eliezer Ladeia Gomes

10 Questions 20 Answers 0 Followers

Questions related from Eliezer Ladeia Gomes

1H NMR to determine glycerol to glycerol carbonate is possible in a 300 T equipment?

I'm studying the transcarbonation reaction of glycerol to glycerol carbonate. I have read good papers about this issue, but the problem is that the glycerol -CH- peak in my spectra is absent. The...

23 September 2022 4,981 2 View

Has anyone used Arduino to control a fixed bed reactor?

I'm building a module to study a fixed bed reactor. I have to use it to control the outlet pH, the reactor inlet and outlet temperatures, the spectrophotometer outlet data, and the inlet reactant...

04 April 2022 7,133 2 View

Are there specific adsorption / desorption kinetic equations for drugs delivery? Those ones for chemical kinetics could be used? References ?

I have been using chemical kinetics equations (1st order, 2nd, order, etc) for modeling of adsorption /desorption of drugs on molecular sieves. Is this a correct or I need specific equations? I...

08 October 2020 7,929 11 View

During a zeolite crystallization, why aluminum is added at the final stages of solidification?

I'd like to understand how silicon and aluminum behave during crystallization. I need a good explanation...

19 September 2020 1,411 4 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.

18 May 2019 3,987 2 View

I need to prepare ZSM-12 and Beta zeólitas with TEABr, but the OH-/SiO2 ratio is very low and sílica fumed doesn't solubilize. What can I do?

Cannot synthesize these zeolites at low OH/SiO2 ratio.

11 October 2018 8,875 3 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?

12 April 2018 7,121 2 View

I've prepared some zeolites and I would like to dessilicate them. What are the best reagents, concentrations and times to do that?

I've prepared well cristallized ZSM-5,Beta and modernite zeolites. I want to create mesopority in them. I've used HF and NH4F solutions of low concentration. Sometimes the zeolite simply is...

20 March 2018 4,159 3 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...

06 March 2018 2,430 0 View

Our search is about zeolites and applications. We need to buy a TPR (with TPO, TPD and others). Which equipment do you recommend?

We have researched the application of zeolites with different degrees of acidity in biodiesel production reactions. We are also studying zeolites exchanged with transition metals and the effect of...

05 March 2018 4,103 13 View