How to calculate oxygen percentage from lambda value

i have synthesized a novel periodic mesoporous organosilica, but its surface area is not high enough, can you suggest me some ways to increase its surface area?

Hi, currently i am studying the different structures of MnO2 and i do a BET surface analysis to see the BET surface area. For my synthesized material alpha-mno2 has a BET surface area of 122, beta-mno2 is about 52, while delta mno2 is about 227. However, in the reference paper( i use the exact synthesis method in the paper) the alpha mno2 is about 95, while beta mno2 is about 122, while delta is quite similar about 230. Is it normal to have some disrespancies with the synthesized material even when using the same synthesis material with the reference paper?

Thank You For your help.

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I tried to synthesise different morphologies by adjusting the ratio of DMF to methanol. When the DMF and ethanol ratios were 9:1 and 7:3, the XRD images of the samples showed a diffraction peak not belonging to MIL-125 at around 8°. When the DMF and ethanol ratios were 5:5, The XRD of the sample is completely different from MIL-125. I can't determine the composition of the sample.

Why is this happening?

What is the composition of a 5:5 sample？

I'd appreciate it if someone could respond.

How to get the Pore Radius value from BJH data obtained using the BET instrument?

As I am confused I got BJH pore size distribution adsorption and desorption data. in which I got two different values of pore radius. which one should I use?

Please give suitable references too.

Thanks in Advance

During the BET measurement, it keeps adsorbing at relative pressures close to 0.995, and the curve becomes vertical, what's this about ?

kindly help me to interpret that this data follows which type of isotherm. it looks abnormal or if anyone can explain lease provide references.

Thanks in advance

I have been playing with optimizing a method for CO2 adsorption on porous carbons using our Micromeritics ASAP 2020 instrument, but can't seem to find a good balance between analysis time and data quality thus far. Specifically, I am wondering how to approach defining p0 for this analysis as the instrument cannot reach the true p0 value for CO2 @ 273 K, and what I should be looking at in terms of dosing increments. If anyone out there has the same instrument and is willing to share some parameters that work for them so I have somewhere to build off of, this would be much appreciated!

Thanks :)

on catalyst characterization of BET and BJH its well known that BET is for surface area and BJH is pore size distribution but in the BJH result also surface area is reported so what is the diffrence of the surface area by BJH and BET and why we always take BET,in addition to that BET is not recommanded for pores other than meso porous? if thats the case does it mean we should take the surface area by BJH?