## 1 Introduction  
Volatile organic compounds (VOCs) are one of the most important air pollutants, because of several harmful effects on human health and environment [1]. Different technologies are available to reduce VOCs emissions including adsorption, condensation, thermal oxidation, catalytic oxidation, biofiltration, and photocatalytic oxidation [2; 3; 4]. Among these technologies, adsorption is considered as the promising way to treat the industrial waste organic gases, due to its wide range of applicability and high effectiveness. The activated carbon, with high specific surface area and hydrophobicity, is the most used adsorbent for VOCs in the adsorption industry. However, during the gas adsorption by activated carbon (especially for the high concentration VOCs), a large amount of heat is often released, leading to the increase of the temperature in the adsorption column. The increased temperature in the column could reach 50 \({}^{\circ}\)C, which would cause the risk of fire or explosion [6]. In addition, the adsorption efficiency would be lowered because of the increased temperature [7]. Therefore, controlling the temperature during the adsorption is an important consideration in future industrial applications. The hypercrosslinked polymeric adsorbents (HPAs), organic materials with micropore-dominant structure, are prepared by the extensive crosslinking of linear or lightly crosslinked precursor polymers [8]. They have high Brunner-Emmet-Teller (BET) surface area, comparable adsorption capacities with activated carbon for VOCs, and stable physical and chemical properties [9]. The HPAs are produced by an intermolecular and intramolecular crosslinking reaction with the Friedel-Crafts alkylation reaction, radical polymerization, or organolithation routes [10; 11; 12]. These HPAs have been widely applied in air, water purification processes, and gas adsorption [13]. Herein, it is our attempt to apply the HPAs or derivatives as the adsorbent materials together with microencapsulated phase change materials. Phase change materials (PCMs) can store and release a large amount of energy through their phase change, keeping the temperature in a stable state [14]. PCMs have wide applications in thermal energy storage [15] and environment protection [16]. Paraffin waxes are the most commonly used PCM because of low cost, high energy storage density, and largescale availability [17; 18]. Microencapsulation refers to the formation of small, coated particles loaded with material in a certain phase, such as solid, liquid, solid/liquid dispersion, or gas [19]. Microcapsules loaded with phase change materials (MPCMs) can store a large amount of thermal energy and can be used circularly. Since the encapsulated PCMs are protected from air, moisture, microorganisms, and other contaminants, spoilage is reduced and the shelf-life of PCMs is increased. Nowadays, MPCMs have been successfully used in a wide range of applications. [PERSON] et al. used MPCMs in concrete walls for energy savings [20]. [PERSON] et al. treated polyester knit fabrics with MPCMs to develop thermoregulating textile materials [21]. [PERSON] et al. validated the thermal buffering capacity of MPCMs in food packaging application [22]. These examples provide us with an idea of the high potential MPCMs in the adsorption industry to solve the issue of rising temperatures. In this study, we aim to embed microcapsules containing paraffin wax in a hypercrosslinked polymeric adsorbent to help control temperature in the adsorption column. Microcapsules and polymeric adsorbent share a similar route of synthesis called \"suspension polymerization\" [23; 24]. A typical suspension polymerization system includes an oil phase, consisting of a monomer, an initiator, and a water phase containing a stabilizer. Little difference between the raw materials of these two products is noted. There was a porogenic agent in the oil phase in order to make pores in adsorbents when the polymeric adsorbent was synthesized [25].