Ethylene adsorption on cationic surfactant modified zeolite NaY

Development of an Active Film With Natural Zeolite as Ethylene Scavenger

“…Sue-aok et al reported the enhancement of ethylene adsorptivity upon modification of NaY zeolite by group I metal cations 8) . Patdhanagul et al demonstrated that zeolite NaY modified with phenyl trimethyl ammonium bromide (PTAB) as a cationic surfactant, is capable to modified only the external part of zeolite and not capable to enter the micropores of zeolite due to its large long chain, showing an appreciable increase in ethylene adsorption 2,4) . On the other hand zeolite modified with palladium presented a significant ethylene adsorption capacity (4162 µLg -1 material), far superior to KMnO 4 -based scavengers when used in low amounts (10 mg modified zeolite/L) and in conditions of high relative humidity 3) .…”

“…The larger pore diameter (12Å) reported for a natural zeolite, favour that ethylene (kinetic diameter 3.9 Å) can pass through zeolite pore openings 1) , and can be absorbed within the zeolite framework. Two important interactions have been use to describe ethylene adsorption phenomena, first a cation-p interaction which occurs between p-electrons of double bond of ethylene and metal cations, which involves s-donation and p* back donation between the metal cations and de p orbital of ethylene, and also a CH-O interaction, a weak hydrogen bonding between hydrogen atoms of ethylene and oxygen atoms at the zeolite surface, which is weakly electropositive 2,4) . …”

“…Although ethylene has some positive effects, it is often hazardous to the quality and shelf-life of fruits and vegetables 1) . Accumulation at trace levels of ethylene during the storage period may result in a number of specific defects and shorten the harvest shelf life 2) . The removal of ethylene and/or inhibition of the effect of ethylene in stored environments is fundamental to maintaining postharvest quality of climacteric produce 3) .…”

Influence of Different Preparation Methods of Copper Loading on Na-Y Zeolite for Green Gas Emission

“…The FAU-type zeolites, including FAU-X and FAU-Y, with a 3-dimensional pore structure have large channels, large surface area, high cation exchange capacity, high activity, possession of a highly catalytic center and high surface energy [1]. It has been found that the size of zeolite crystals could be a significant impact on the catalytic performance [2].…”

Removal of ethylene from air stream by adsorption and plasma-catalytic oxidation using silver-based bimetallic catalysts supported on zeolite

“…Among VOCs, ethylene is an important raw material widely used in various industrial reactions [6]. Besides, many agricultural commodities produce ethylene during storage and transportation [7]. Ethylene can bring about physical and chemical changes in the appearance and texture of fruits and vegetables such as yellowing and softening [8], thereby considerably degrading the quality.…”