Gobinda Behera

12 Questions 72 Answers 0 Followers

Questions related from Gobinda Behera

For hot filtration test, what is the actual condition to separate the catalyst from the reaction mixture and run the reaction to complete?

I have done a reaction whose optimum time is 10 h. So at what time I should stop the reaction and separate the catalyst and then analyze. When the reaction completes 20 to 30% or at 5 h?

04 April 2013 3,596 5 View

From NH3-TPD analysis, could it be possible to distinguish Bronsted and Lewis acid sites? If so then how?

I have synthesized WO3 based materials. The materials show two peaks at lower and higher temperature. I assume that lower temp. peak is for Bronsted acid sites and higher temp. peak is for Lewis...

02 February 2013 3,199 20 View

If there is no peak for the promoted material in the XRD of the catalyst, could we say that the doped material is either amorphous or well dispersed?

I have synthesized WO3 promoted vanadium phosphate, but I did not get any peak for WO3 in XRD. This may be due to the amorphous nature of WO3 or it was well dispersed or both. Could anyone make a...

02 February 2013 6,645 10 View

From UV-vis analysis, how can you tell whether the promoted material remains in bulk or isolated form?

I have synthesized WO3 promoted vanadium phosphate. How can it be proven from UV-vis analysis that the WO3 remains as W, WO3, WOx, WO3 or xH2O? Can anybody help me in this regard or suggest any...

02 February 2013 9,815 4 View

What interaction is there in a metal(0) doped material? Which activates the reaction the metal(0) or the bulk material?

I have synthesized Pd doped Vanadium phosphates. One is Pd(0)-VPO and another is Pd(II)-VPO. If the Pd in Pd(0)-VPO is neutral then there will be no interaction, then how does it lie in the bulk...

02 February 2013 9,843 0 View

Why cant we get same strong peak for different planes for the same material?

As the X-ray fall on the same material what really happens?

12 December 2012 293 3 View

How can one get confirmed the presence of redox couple in a material containing two different metals?

A material containing Mo and V shows Mo5+ / Mo6+ and V5+/V6+ couples. How can i confirmed the presence of redox couple in the materials?

11 November 2012 8,681 5 View

If a promoting material is not found in the XRD of the bulk material, what can we conclude? Is it amorphous or well dispersed in the bulk matrix?

Actually I have prepared Al-VPO. But I did not get any peak of Al in the XRD pattern of Al-VPO. So it might be well dispersed or amorphous? If so then which is the active sites if I'll use it for...

09 September 2012 8,868 13 View

What is the difference between dye degradation and decomposition? What are the conditions for a material to be used in this process?

Can mesoporous material be used in dye degradation? I want to do some photocatalysis like dye degradation and wish to know about the materials used in this process.

09 September 2012 6,797 3 View

Is the nanorod of any material one dimensional (1D) or two dimensional (2D)?

Some literature describes nanorods as 1D and some other 2D? Can anyone explain?

07 July 2012 808 13 View

I got rosette type morphology of my parent sample (VPO) but after impregnation with Molybdenum (Mo) its structure changes to irregular petals. Why?

Why does the morphology change with the impregnation of the bulk vanadium phosphorous oxide (VPO)? What happens? I have synthesized the Mo-VPO materials in wetness-impregnation method and calcined...

06 June 2012 203 8 View

How does low angle X-Ray diffraction (XRD) determine the mesoporosity of a material?

Generally low angle XRD shows the mesoporosity of the materials. but i dont know how it does this. Can any body explain it?

04 April 2012 8,440 20 View