Thermal decomposition study of polyvinyl chloride in the presence of commercially available oxides catalysts

Abstract

The pyrolysis behavior of polyvinyl chloride (PVC) in the presence of commercially available oxides catalysts was investigated using thermogravimetry. The pyrolysis proceeded under a heating rate of 5°C/min in the temperature range of 200-650°C.The thermogravimetric properties in terms of reduction in maximum degradation temperature and percent conversion were studied. The silica gel mesoporous catalyst, with a greater pore size and surface area, was found to be the most active materials in terms of reduction in maximum degradation temperature and increase in percent conversion. The alumina acidic, silica ppt, and alumina neutral catalysts also showed good results; however, their effects were less pronounced as compared to silica gel. The effects of these different catalysts show that surface area, pore size, and number of acidic sites are found to be the major factors for the energy efficient degradation of polymers. K E Y W O R D Scatalytic thermal degradation, number of acidic sites, polyvinyl chloride, pore size, reduction in maximum degradation temperature, surface area

Effects of Organic Based Heat Stabilizer on Properties of Polyvinyl Chloride for Pipe Applications: A Comparative Study with Pb and CaZn Systems

“…As mentioned in item 3.3.1, the behaviors proved that the stability of the chemical bonds of C-Cl were lower than the C-C bonds. Therefore, when PVC is pyrolyzed, the chemical bonds of C-Cl would break first, while weight loss of PVC in the second stage was assumed as the breaking of the C-C bonds [ 27 ]. In two thermal degradation stages, the first stage is considered as the most important stage because the C-Cl bond in the PVC, having less energy than the C-C bond, dissociates first, resulting in the volatilization of the hydrogen chloride molecule.…”

Solid waste management in non-State armed group-controlled areas of Syria case study - Jisr-Ash-Shugur-district

“…It is highly recommended to establish a general management of solid waste for DAAS to achieve a best service of SWM and use the available resources in a good way and take a benefit of the studies which related to the developing countries to convert solid waste into useful products, such used rubber tire pyrolysis of waste tire rubber to produce liquid fuel. [19], recycling of waste plastics for utilization it as an energy source [20] and Biodiesel production from waste oils [21].…”

Recent Trends in the Pyrolysis of Non‐Degradable Waste Plastics

“…The degradation of PVC with precipitated silica (silica ppt) as a catalyst was investigated by Nasir et al. using a fluidized bed reactor [182] . In the first step, HCl was removed due to the C−Cl bond breakage.…”

“…[179] The degradation of PVC with precipitated silica (silica ppt) as a catalyst was investigated by Nasir et al using a fluidized bed reactor. [182] In the first step, HCl was removed due to the CÀ Cl bond breakage. In the second step, the CÀ C bonds of the remaining organic part were cleaved by CÀ C bond scission.…”