27 replies to this topic

[Art Montemayor]

Abraham:

Please read this entire, 4-year old, Thread. I feel that I have supplied ALL the necessary information to allow you to process design a hot zinc application. Simply follow the instructions.

[ChemE2014]

what if there is H2S in methane feed going to SMR , is it going to be poisonous to Ni catalyst? and how do you calculate the bare minimum amount of H2S before it starts attaching it self to the active sites in Ni?

[thorium90]

You could have started your own thread.

H2S slip from the HDS is a sign the HDS is not working properly. Preferably maintain organic sulphur less than 5ppb. 1ppm will cause carbon formation within days.

The following is a nice article.

http://144.206.159.1...5324/605600.pdf

 

A quote from it: "H2S adsorbs strongly and dissociatively on nickel metal surfaces"

Also from the article: "half coverage occurs at 1–10 ppb H2S"

"At the same temperature (450◦C) almost complete coverage (θ > 0.9) occurs at values of PH2S/PH2 of 10−7–10−6 (0.1–1 ppm) or at H2S concentrations encountered in many catalytic processes after the gas has been processed to remove sulfur compounds."

Edited by thorium90, 06 February 2013 - 05:20 AM.