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Mechanisms of the potassium stabilization in K2Fe22O34

Mechanisms of the potassium stabilization in K2Fe22O34
File Size:
125.05 kB
Author:
Michał Trębala
Email:
trebala[at]chemia[dot]uj[dot]edu[dot]pl
Date:
13 August 2013
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Abstract: Effect of potassium stabilization in K2Fe22O34, the principal phase of styrene catalyst is caused by doping Cr and Ce. The effect was investigated by means of potassium ion and neutral atom thermal desorption. Th e kinetics for K+ and K emission from undoped and Ce-, Cr-doped b-K2Fe22O34 is studied with the fi eld reversal technique and steady-state mode in high vacuum conditions. Two main mechanisms of the stabilization were developed depending on the dopant location. Chromium is located in the structure of -ferrite and slows down the diff usion potassium ion. Cerium segregated at the basal planes favoring the cationic state of potassium inhibits the probability of potassium atoms to leave the K2Fe22O34 surface via work function increase

Keywords: Potassium ferrite, Styrene catalyst, potassium lost, work function, potassium desorption

Area: Nanotechnologies and Materials

BibTeX:

@article{Trebal2011,
  author = {Michał Trębala},
  title = {Mechanisms of the potassium stabilization in K2Fe22O34},
  journal = {Challenges of Modern Technology},
  year = {2011},
  volume = {2},
  number = {2},
  pages = {43--45},
  url = {http://www.journal.young-scientists.eu/index.php/isuues/file/31-mechanisms-of-the-potassium-stabilization-in-k2fe22o34}
}
 
 

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