Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Abstract

Compared with other approaches for the removal of VOCs, the concept of “storage‐regeneration” cycling is proposed as an effective and promising way to eliminate low‐concentration indoor VOCs. A key issue in this approach is the design of catalytic materials which should possess balanced properties between storage and regeneration. The materials used for the storage of VOCs such as formaldehyde and benzene should not only possess high and selective VOC storage capacity, but also be easily regenerated without any release of the VOCs or generation of secondary pollutants. To this end, appropriate regeneration methods have been proposed, including thermal regeneration, plasma (nonthermal plasma) oxidation or ozone enabled regeneration. In this short review, these essential features of the cycled “storage‐regeneration” concept for VOC destruction are considered and the prospects for the implementation of this technology are assessed.

Abatement of Toluene Using a Sequential Adsorption-Catalytic Oxidation Process: Comparative Study of Potential Adsorbent/Catalytic Materials

“…For instance, storage regeneration processes have been proposed and investigated to eliminate low-concentration indoor VOCs such as formaldehyde and benzene [9]. This sequential method implies two steps: (i) first, the VOC is adsorbed on a material and (ii) then a regeneration of the material through VOC oxidation into CO 2 and H 2 O is performed.…”

“…The bifunctional materials used for the storage of VOCs should thus not only possess high and selective VOC storage capacity, but also be easily regenerated without any release of the VOCs or generation of secondary pollutants. To that order, thermal regeneration [9], non-thermal plasma oxidation [10,11], or ozone enabled regeneration [12] have been assessed as regeneration methods.…”

Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream

“…Among different VOCs, the removal of toluene is particularly important as it is one of the main VOCs serving as a significant contributor to the production of photochemical smog [4]. Numerous technologies such as adsorption [5], ozone oxidation [6], catalytic oxidation [5], and thermal catalytic combustion [7] have been used to address the abatement of high concentrations of VOCs. Each of these technologies has its own advantages and drawbacks.…”

Characteristics and mechanism of toluene removal by double dielectric barrier discharge combined with an Fe2O3/TiO2/γ-Al2O3 catalyst

“…[1][2][3][4][5] Low-temperature plasma has become a research hotspot because of its high response rate to VOCs, the low cost of the processing technology and the convenience of opening and closing the experimental device. [6][7][8] Dielectric barrier discharge, a method for efficiently generating low-temperature plasma, involves applying an alternating voltage to two electrodes covered by an insulating medium to break down the working gas between the electrodes, accelerate free electrons, endow the gas with high energy and cause electron collapse. [9][10][11] The VOCs in the reactor are mainly degraded in two ways: in the rst, the molecular structures of the VOCs themselves are destroyed by high-energy electrons and split into smaller particles, while in the second, high-energy electrons collide with gas molecules such as N 2 and O 2 .…”