Performance of TPA loaded sba-15 catalyst in polypropylene degradation reaction

Ersoy Yalçın, Ulviy
Plastic materials are widely used due to their low cost and easy processing properties. With an increase in plastic usage, the amount of plastic wastes has also increased, and this situation causes environmental problems. Landfilling, incineration, and recycling are the methods used for the disposal of plastic wastes. Landfilling is not a convenient method as it causes soil pollution. Incineration is also not preferred due to its harmful effects on the environment caused by toxic gases. Recycling seems to be the most convenient method to eliminate environmental problems. In this study, tungstophosphoric acid (TPA) loaded SBA-15 catalysts with different TPA loadings were synthesized via one-pot hydrothermal method. To investigate the performance of these catalysts in the degradation of PP, pyrolysis experiments were carried out at 315 °C and 400 °C for 30 minutes, with a heating rate of 5°C/min, under nitrogen atmosphere at a flow rate of 60 cc/min and a catalyst to polymer weight ratio of 1/2. Characterization of the synthesized materials was done using various characterization methods. Synthesized materials exhibited Type IV isotherms, and pore sizes changed between 6.7-9.7 nm, showing the mesoporosity of the materials. Surface areas of the synthesized materials decreased with an increase in the amount of TPA loaded. All catalysts exhibited both Lewis and Brønsted acid sites. TPA loaded SBA-15 catalysts decreased the activation energy of PP degradation reaction from 172 kJ/mol to 100.5 kJ/mol. The liquid product amount increased with an increase in the reaction temperature and TPA loading while the gas product amount decreased. The solid residue was not observed when the catalysts were used. TPA loaded SBA-15 catalysts had high isobutane and ethylene selectivity among gas products. The majority of the liquid products consisted of C8-C14 at both temperatures. SBA15-TPA 0.20 showed the best performance in the catalytic degradation of PP with the highest selectivity of C10 at 315°C and C14 at 400 °C. Products in the gasoline range can be obtained mostly at 315 °C, while products in the diesel range can be obtained mostly at 400 °C.


Kinetic modeling of enzymatic hydrolysis of pretreated kitchen wastes for enhancing bioethanol production
Çekmecelioğlu, Deniz (Elsevier BV, 2013-03-01)
It is well known that use of low cost and abundant waste materials in microbial fermentations can reduce product costs. Kitchen wastes disposed of in large amounts from cafeterias, restaurants, dining halls, food processing plants, and household kitchens contain high amounts of carbohydrate components such as glucose, starch, and cellulose. Efficient utilization of these sugars is another opportunity to reduce ethanol costs. In this study, the effect of pretreatment methods (hot water, acid solutions, and a...
Characteristics of dual-type electrochromic devices based on poly(ethylene oxide) copolymers
Yildiz, Huseyin Bekir; Sahin, Elif; Çırpan, Ali; Toppare, Levent Kamil; Yagci, Yusuf (Wiley, 2007-05-01)
Dual-type polymer electrochromic devices based on [(3-thienyl)methylmethacrylate]-co-[p-vinyl benzyloxy poly(ethylene oxide)]/polythiophene and thiophene-capped poly(ethylene oxide)/polythiophene and ethylene dioxythiophene were constructed via electropolymerization. Spectroelectrochemistry, switching ability and stability of the devices were investigated using UV-visible spectrophotometry and cyclic voltammetry. These devices exhibit low switching; voltages and short switching times with reasonable switchi...
Synthesis and characterization of TPA loaded mesoporous catalysts and their performance in pyrolysis of polypropylene
Kasapoğlu, Ceren; Sezgi, Naime Aslı; Department of Chemical Engineering (2013)
Plastic materials have attracted attention in recent years because of their functionalities therefore; they are widely used in household and industry. As their usage increases, plastic waste amount also increases and this is an important environmental problem. Chemical recycling of these materials is a useful method to solve this problem because plastic materials can be converted into petrochemical feedstock with this method. In this study, tungstophosphoric acid (TPA) loaded SBA-15 materials were synthesiz...
Catalytic pyrolysis of plastic wastes over SAPO-34 catalyst
Bursalı, Tülay; Sezgi, Naime Aslı; Doğu, Timur; Department of Chemical Engineering (2014)
Thermoplastic materials have a wide variety of usage area due to their low costs and easy processing properties. However, these materials cause a serious environmental pollution because of being non-biodegradable and their long-term self-recycling. Considering energy need and clean environment, it is proper to degrade thermoplastic materials into lower moleculer weight products which are potential raw materials for petrochemical industry. In addition, it is possible to decrease the reaction temperature & ti...
Characteristics of polylactide composites involving montmorillonite and boron compounds
Akar, Alinda Öykü; Hacaloğlu, Jale; Department of Polymer Science and Technology (2016)
Poly(lactic acid) (PLA) is a biodegradable and biocompatible polymer and it is accepted as a promising alternative to the petroleum based materials. The main objective of this study is to investigate the effect of the type and the amount of boron compounds with the addition of nanoclay to thermal, mechanical properties and flame retardancy of poly(lactic acid) (PLA) based nanocomposites. By this aim, zinc borate (ZnB), benzene-1,4-diboronic acid (BDBA) and Cloisite 30B (C30B) are used as an additive in PLA ...
Citation Formats
U. Ersoy Yalçın, “Performance of TPA loaded sba-15 catalyst in polypropylene degradation reaction,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Chemical Engineering., Middle East Technical University, 2019.