Catalysts for hydrodechlorination of chlorine-containing polymers and organic waste

The interest in hydrodechlorination (HDC) as a safe way to convert waste into high added value products is due to the significant amounts of chlorine-containing polymers in industrial and household waste plastics, a wide variety of liquid chlorine-containing wastes and their high environmental toxicity. The review analyzes the composition of chlorine-containing waste, including liquid products of pyrolysis, hydrocracking and hydrothermal treatment of polyvinylchloride and mixed waste plastics containing chlorinated polymers. The distinctive features of the HDC process are considered in comparison with hydrodesulfurization and hydrodeoxygenation reactions. The achievements of the last 15 years in the field of HDC catalysis are analyzed. Much attention is given to bimetallic noble metal catalysts and catalysts based on transition metal sulfides and phosphides. The prospects of sulfide and phosphide catalysts for processing complex mixtures of heteroatomic compounds, including products of pyrolysis of waste plastics mixtures, pyrolysis of polymer and biomass mixtures, hydroconversion of polymers in oil fractions are shown. The bibliography includes 294 references.