Insights into the evolution of chemical structure and pyrolysis reactivity of PVC-derived hydrochar during hydrothermal carbonization

Abstract

This article investigates the impact of hydrothermal temperature on two PVC structures and the thermal degradation of hydrothermal carbon. It aims to establish a quantitative link between hydrothermal carbon structure and reactivity.

Superstructured carbon materials: design and energy applications

“…Although energy-storage and conversion systems differ in their reaction mechanisms and face different performance challenges, all of these systems are collectively referred to as electrochemical energy technologies and primarily rely on classical electrochemical principles. In fact, the macroscopic features of materials are highly determined by the intrinsic nature of the "paradigm" unit and the way they are arranged in space [12] . If the basic "paradigm" comprising certain structural characteristics can be utilized as a building block and then arranged in a certain spatial order by design, novel carbon materials with remarkable properties can be expected, and even the understanding of the functions of carbon materials can be further improved.…”

Upgrading Polyvinyl Chloride by ZnO-Assisted Solvothermal Dehalogenation

“…PVC waste is a promising precursor for high-value carbon materials because high-content sp 2 -C can be obtained during HCl removing. Great efforts have been made in pyrolysis and hydrothermal carbonization of PVC. − However, some issues still need to be addressed. For pyrolysis carbonization, the carbon residue rate of direct pyrolysis is only ∼10 wt %.…”

“…In addition, chlorinated organic compounds within the pyrolysis products diminishes product quality and limits its’ applications. ,− Besides, ultrahigh temperature (>1000 °C) is normally needed for highly conductive carbon materials. For hydrothermal carbonization, the dechlorination ratio is insufficient, over 5–8 wt % Cl remains in the products even at 260 °C, as well as the complex post processing. Besides, the subcritical water process delivers a high dechlorination ratio (>97%), − and transferred the removed Cl into aqueous phase .…”