Noble-Metal-Based Catalytic Oxidation Technology Trends for Volatile Organic Compound (VOC) Removal

Abstract

Volatile organic compounds (VOCs) are toxic and are considered the most important sources for the formation of photochemical smog, secondary organic aerosols (SOAs), and ozone. These can also greatly affect the environment and human health. For this reason, VOCs are removed by applying various technologies or reused after recovery. Catalytic oxidation for VOCs removal is widely applied in the industry and is regarded as an efficient and economical method compared to other VOCs removal technologies. Currently, a large amount of VOCs are generated in industries with solvent-based processes, and the ratio of aromatic compounds is high. This paper covers recent catalytic developments in VOC combustion over noble-metal-based catalysts. In addition, this report introduces recent trends in the development of the catalytic mechanisms of VOC combustion and the deactivation of catalysts, such as coke formation, poisoning, sintering, and catalyst regeneration. Since VOC oxidation by noble metal catalysts depends on the support of and mixing catalysts, an appropriate catalyst should be used according to reaction characteristics. Moreover, noble metal catalysts are used together with non-noble metals and play a role in the activity of other catalysts. Therefore, further elucidation of their function and catalytic mechanism in VOC removal is required.

Catalytic Oxidation of Acetone on SmMn2O5: Effect of Acid Etching and Loading Treatment

“…The catalyst that degrades pollutants is the core of catalytic oxidation technology, and its activity directly affects the efficiency of catalytic reaction . Noble metal catalysts are widely used in the field of catalysis, such as platinum (Pt), gold (Au), palladium (Pd), silver (Ag), and relatively expensive rhodium (Rh). , Due to the scarcity and high price of noble metals, research interest in recent years has shifted to supported noble metal catalysts and non-noble metal oxide catalysts . The latter is especially important due to limited resources, such as the exploration of perovskite, mullite, and Cu-, Co-, and Mn-based oxide catalysts. , …”

TiO2-based catalytic systems for the treatment of airborne aromatic hydrocarbons

“…19,20 As a fact, the thermocatalytic approach is widely used in industrial processes for the removal of gaseous VOCs (including BTX) emitted by pharmaceutical, printing, and textile industries utilizing solvent-based processing. 21,22 The requirement for high operational temperatures limits the applicability of thermal catalysis from economic and environmental viewpoints. 23,24 Consequently, photocatalytic abatement of BTX has attracted increasing attention because of its cost-effectiveness and ability to work in ambient conditions.…”

“…The photothermal catalytic technology has improved through the synergistic modulation of the catalytic activities between photochemical and thermochemical reaction mechanisms to reduce energy consumption. 31–33 In particular, TiO 2 -based catalysts have been recognized as effective and versatile platforms for several catalytic modes such as thermocatalysis, 22,34 photocatalysis, 35,36 and photothermocatalysis. 37,38 Nonetheless, the practical application of pristine TiO 2 has not generally been acknowledged due to operational inefficiency ( e.g.…”

Influence of Impregnation Medium on the Adsorptive Performance of Silica Sulfuric Acid for the Removal of Gaseous o-Xylene: Comparison on Ethyl Acetate and Water

“…Many different methods, such as condensation, liquid absorption, solid adsorption, thermal incineration, complete catalytic combustion [9] and biological degradation, have been developed to control VOCs pollution [10][11][12][13][14]. Among them, adsorption is a favored 2 of 11 technology in this field due to lower economic cost, process safety and renewable adsorbents, etc.…”