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

Removal of chlorobenzene using a sequential adsorption–plasma catalytic system over Ag‐, Ce‐ and Mn‐modified activated carbon catalysts

“…Because S BET and textural properties of the four catalysts were almost the same, the different chlorobenzene adsorption performance was not due to physical adsorption. It has been well recognized that metals possessing empty s‐orbitals and d‐orbitals containing available electrons can form strong π‐complexation bonds . Therefore, we believe the significantly enhanced adsorption capacity of Ag/AC can mainly be attributed to the stronger π‐complexation bonds formed by Ag when compared to Ce and Mn …”

“…The VOCs are first trapped in an adsorbent/catalytic material in the absence of plasma until the material becomes saturated and then the adsorbed VOCs are oxidized using NTP . This process has been shown to enhance the energy efficiency and suppress the formation of byproducts and organic intermediates in the removal of toluene, benzene, formaldehyde and ethylene …”

“…In addition to the active component in the catalysts, the supporting material plays an important role in increasing the adsorption and catalytic capacity. Recently, many researchers have explored HZSM, γ‐Al 2 O 3 , SBA and 13X zeolite as supporting materials to enhance the decomposition of VOCs in sequential adsorption–plasma oxidation systems. Activated carbon (AC) is considered an excellent adsorbent for the adsorption of VOCs due to its porous structure and high surface area.…”

Plasma-catalysis of metal loaded SBA-15 for toluene removal: Comparison of continuously introduced and adsorption-discharge plasma system

“…Since the BET surface area and the textural properties of the four catalysts were almost the same (as seen in Table 1), the different toluene adsorption capacity was not because of the physical adsorption. It was reported that the metals that possessed empty s-orbitals and available electrons in the d-orbitals, which could form strong p-complexation bonding [35]. Therefore, the significantly enhanced adsorption capabilities of Ag/SBA-15 and AgMn/SBA-15 catalysts could be attributed to the p-complexation adsorption with toluene on Ag [25,26].…”

“…Other studies have found similar results for the multi-cycle performance in the adsorption-discharge plasma system. Trinh et al [35] reported that the adsorbent/catalyst remained complete adsorption of ethylene in five cycles. Chen and Pan [39] found that the activated carbon remained high adsorption capacity in ten cycles.…”