Noor Aljammal

17 Questions 40 Answers 0 Followers

Questions related from Noor Aljammal

What are the recommended companies that offer pilot plant scale Continuous Flow Hydrogenation reactors?

I am seeking recommendations for lab scale Continuous Flow Hydrogenation reactors from reputable companies that can accommodate pharmaceutical reaction requirements. Any suggestions or insights on...

26 June 2023 3,414 1 View

Can you please provide me with references where I can find the partition coefficient of Hydrazoic acid in water and air?

I am currently in the process of calibrating an FTIR gas analyzer for HN3 (Hydrazoic acid). To validate the accuracy of the measured data and compare it with the theoretical values, I require the...

17 May 2023 2,187 0 View

Can you please suggest some nice references about the difference Between Positive and Negative Catalyst?

There can be positive and negative catalysts, according to the catalyst’s effect on the rate of reaction. The key difference between positive and negative catalysts is that positive catalysts are...

08 October 2022 2,352 1 View

Why catalyst activity of the spent catalyst is higher than the fresh one?

Dears I am doing some experiments in aldol condensation reaction and I noticed that the activity of the spent catalyst is higher than the fresh one. Any suggestion regarding this finding will be...

03 March 2022 9,553 17 View

Can xylose be formed from fructose over acid catalysts?

I am new in the field of sugar chemistry. I wanted to know if it is possible for fructose to be converted to xylose over acidic conditions. I saw in some schemes a pathway from fructose to xylose...

08 December 2020 5,408 3 View

Why I obtain very high surface area under HMF peak in HPLC even with suitable dilution?

I am converting Fructose into HMF, Levulinic acid and formic acid are possible side products. I analyze the data via HPLC, bio rad column, I got nice results for some reaction set. But when I...

24 September 2020 6,527 7 View

Why the difference between real activation energy and apparent activation energy is so large?

We are performing biomass conversion test and we are comparing the result of conventional heating with microwave heating in order to quantify the MW effect in terms of imaginary impact on...

13 May 2020 9,230 2 View

Why I am getting a very large area under the curve for HMF peak on HPLC spectra, knowing that I used a suitable dilution factor?

Kindly note that we perform experiments for fructose dehydration into 5-HMF over heterogeneous catalysts. For the product analysis, we used HPLC equipped with a refractive index unit (RIU))...

23 April 2020 4,722 6 View

How can the criteria of internal/external mass and heat transfer be applied on flexible MOFs?

As you know some MOFs are flexible and the way the flexible MOF behaves toward external stimuli such as temperature, pressure can affect their diameter (e.g., breathing) and many other physical...

08 March 2020 1,267 3 View

Why heating rate in vacuum oven is important for MOFs synthesis?

Vacuum drying is probably the least evasive technique and also it is the first thought that comes to mind when evacuating a material BUT usually MOFs collapse after solvent removal and to avoid...

07 March 2020 9,328 9 View

How can the salt concentration in oil-polluted water (oil= hydrocarbon) affect the adsorption behavior, in case of using adsorbent to remove HC?

I tested the potential of several adsorbents in removing hydrocarbon from water surface using several hydrocarbon models mixed with water( such as toluene, benzene) I want to know the effect of...

10 December 2019 834 3 View

Can you advise regarding RID detector detecting range for fructose and HMF?

Quantification of 5-HMF and fructose performed using a high-performance liquid chromatography (HPLC, Agilent 1200) equipped with a RID detector and reversed phase C-18 column at 30 °C. I used a...

26 November 2018 4,780 11 View

Why the surface area of adsorbent increase after adsorption??

I have implement adsorption test of oil/water solution using modified zeolite as adsorbent, the BET analysis for the used adsorbent indicate there is 30% increase in surface area. kindly note that...

22 March 2017 3,570 7 View

I used standard KHP as part of a mixed standard for (vario TOC cube) calibration to measure Octane content, the results were far from expected?

The following is the mixed standards 1.KHP2. Na2CO33.NaNO3 4.NH4Cl so which is the best method of calibration to measure carbons content after adsorption: Multiple point calibration from one...

19 March 2017 3,443 2 View

I have prepared oil-octane solution(677 mg/l) but TOC measurement showed lower concentration than the prepared solution, any suggestions?

For TOC measurements, I have prepared oil-octane solution(677 mg/l) but when I measured the concentration of the prepared solution in TOC the concentration is much lower?can anyone help me by this

06 March 2017 2,047 3 View

How to increase hydrophobic property of Carbon Nanotubes (CNT)?

The applications of functionalized carbon nanotubes are numerous. Modifying the surface of the individual carbon nanotubes by decorating the surface with OH, COOH, NH2, F, or other groups...

10 October 2016 705 6 View

How can we prevent the increase of temperature in Ultrasonic micro-reactors?

A major drawback of applying low-frequency ultrasound and exploiting the cavitation phenomena is the increase in temperature due to the collapse of the bubbles. These collapses lead to the...

01 January 1970 7,416 1 View