Ansari Palliyarayil

16 Questions 18 Answers 0 Followers

Questions related from Ansari Palliyarayil

Can anybody suggest a support material (for incorporating metal nanoparticles) having neutral surface charge?

Hi all, Are there any materials having a surface charge neutral? I wanted to carry out some control experiments for my catalysts. For that, I need to incorporate my metal nanocatalysts over a...

02 August 2023 5,529 0 View

How to prepare a metal supported membrane sample for HRTEM analysis?

Hi all, I have synthesized a metal nanoparticle incorporated membrane catalyst. I wanted to analyze the same by HRTEM. Could anybody please suggest a method to prepare the grid for this kind of...

26 February 2023 1,170 3 View

Why the XRD peak intensity is less for Pd(+2) compared to Pd(0) where both species are present on the same surface with Pd(+2) as the major species?

Hi all, I have prepared Pd supported heterogenous catalyst by liquid media assisted reduction method. From the XPS it was observed that the surface is composed of both Pd+2 (as the major species,...

03 January 2022 8,335 5 View

In BET isotherm, the quantity adsorbed is plotted against P/P0 (X axis) instead of pressure. Why it is taking P/P0, Instead of pressure?

Hi friends, As we all know, Isotherm is the relationship between quantity adsorbed and pressure at constant temp. But in isotherm plots, quantity adsorbed is usually plotted against P/P0. Why it...

02 January 2022 6,267 3 View

Will there be any change in the 2 theta value as the nano particle size varies?

Hi all, I have prepared Pd nano particles using different reducing agents and the size of the particles varied from 10 to 16 nm. In the XRD pattern, there is a change in the 2 theta value of ~1...

30 December 2021 3,219 8 View

Why meso porous materials show hysteresis loop on adsorption isotherm?

Hi all, The adsorption isotherm for a meso porous material like activated carbon shows an hysteresis loop at P/P0 around 0.4. Can anybody from this platform can explain what could be the reason?

26 December 2021 8,968 6 View

Why the UV-Vis spectrum of Pd in different solution gives different peaks?

Hi All, I have three solutions, which contain Pd extracted by using different extraction media, i.e., (1) HCl-H2O2, (2) HCl, and (3) Aqua regia. The UV Vis spectra of each solution show peaks at...

21 December 2021 8,131 3 View

Is it possible to detect Hydrogen and Helium by XPS? If not, why?

Hi Friends, Can anybody from this platform explain the reason, why hydrogen and helium are not possible to detect by XPS? Thanks and Regards ANSARI P

21 December 2021 6,541 4 View

Why Pd catalyst in nano size is necessarily required for CO oxidation? Also, is there any other way of CO removal than catalytic oxidation?

Hi all, CO is one of the major air pollutants which toxic. Most of the literature says catalytic oxidation as a removal remedy for CO, by using catalysts especially Pd in nano size. Can anybody...

13 December 2021 3,877 9 View

How can I prepre the powdered samples for XPS?

Hi all, I have prepared some biomass-based activated carbon samples which are powdered in nature. To analyze for XPS, I had prepared the slides by dispersing the sample in ethanol and drop cast on...

05 September 2021 5,537 6 View

How to calculate the activity of a catalyst in mol/kg/hr?

Hi all, I have done a CO oxidation reaction by using Palladium impregnated activated carbon based catalysts. The catalyst was showing the 100% conversion for a duration of 3-5 hrs. How can I...

29 September 2020 1,256 2 View

In H2 chemisorption analysis, catalyst with less amount of Pd+2 shows higher H2 consumption than the one with higher Pd+2, what could be the reason?

Hi Friends, I have prepared Pd impregnated carbon based catalysts using HCHO and NaBH4 as the reducing agents. From XPS, it has been observed that the surface of the catalysts contains both Pd0...

20 July 2020 2,794 7 View

Does granular activated carbon (Without any modification) will adsorb carbon monoxide? If not, what could be the reason?

Dear friends, For the removal of carbon monoxide, generally catalysts such as Pd, Pt etc. supported on various supports such as activated carbon are used. Why carbon monoxide is not getting...

14 June 2020 1,584 0 View

The XPS of Pd impregnated microporous carbon based catalyst shows Pd(+2) peaks while XRD and HRTEM shows both Pd(0)&Pd(+2). How can I explain this?

Dear friends, I had prepared Pd NPs impregnated micro porous carbon based catalyst through green route. The XRD and HRTEM of the same shows the presence of both Pd(0) and Pd(+2) on it. Since the...

26 March 2020 6,696 7 View

How to remove the residual chloride ions?

Hi friends, I have some samples of activated carbon prepared using ZnCl2 as the activating agents. Washing has done with hot distilled water many times to remove the residual chloride ions....

08 December 2019 984 2 View

How to calculate the Turn Over Frequency (TOF) of a catalyst?

Hii friends, I have prepared an activated carbon based Pd catalyst for the CO oxidation. I have done the breakthrough studies at ambient pressure and temperature. How can I calculate...

20 June 2019 7,320 2 View