Health & Environmental Research Online (HERO)


Print Feedback Export to File
5020567 
Journal Article 
The origin of the extraordinary stability of mercury catalysts on the carbon support: the synergy effects between oxygen groups and defects revealed from a combined experimental and DFT study 
Li, J; Fan, J; Ali, S; Lan, G; Tang, H; Han, W; Liu, H; Li, Bo; Li, Y 
2019 
1 
Cuihua Xuebao / Chinese Journal of Catalysis
ISSN: 0253-9837 
SCIENCE PRESS 
BEIJING 
40 
2 
141-146 
English 
WOS:000457815900001 
Thermal stability of HgCl2 has a pivotal importance for the hydrochlorination reaction as the loss of mercuric compounds is toxic and detrimental to environment. Here we report a low-mercury catalyst which has durability over 10000 h for acetylene hydrochlorination under the industrial condition. The stability of the catalyst is carefully analyzed from a combined experimental and density functional theory study. The analysis shows that the extraordinary stability of mercury catalyst is resulted from the synergy effects between surface oxygen groups and defective edge sites. The binding energy of HgCl2 is increased to be higher than 130 kJ/mol when adsorption is at the edge site with a nearby oxygen group. Therefore, the present study revealed that the thermal stability problem of mercury-based catalyst can be solved by simply adjusting the surface chemistry of activated carbon. Furthermore, the reported catalyst has already been successfully applied in the commercialized production of vinyl chloride. (C) 2019, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. 
Mercury catalysts; Thermal stability; Defects; Oxygen groups; Acetylene hydrochlorination 
IRIS
• Inorganic Mercury Salts (2)
     Mercuric Chloride
          Litsearch 2018-2019
               WOS