TAILIEUCHUNG - INTERFACIAL APPLICATIONS IN ENVIRONMENTAL ENGINEERING - CHAPTER 13

Giải độc của tập trung Dẫn xuất halogen hóa Streams khí Sử dụng các chất xúc tác Nickel rắn được hỗ trợ Clo hợp chất hữu cơ hiện nay là một nguồn thành lập ô nhiễm môi trường [1-3]. Sự hiện diện của các hợp chất nonbiodegradable này thải nước thải là mối quan tâm ngày càng tăng do các bằng chứng cho thấy tác động có hại cho sức khỏe, sinh thái và công cộng [4,5]. Như một hệ quả trực tiếp, pháp luật nghiêm ngặt hơn bao giờ hết đang được giới thiệu với giới hạn phát thải chloro-dẫn. | 13 Detoxification of Concentrated Halogenated Gas Streams Using Solid Supported Nickel Catalysts MARK A. KEANE University of Kentucky Lexington Kentucky . I. BACKGROUND Chlorinated organic compounds are now an established source of environmental pollution 1-3 . The presence of these nonbiodegradable compounds in effluent discharges is of increasing concern due to the mounting evidence of adverse ecological and public health impacts 4 5 . As a direct consequence ever more stringent legislation is being introduced to limit those chloro-emissions that lead to contamination of wastewater and trade effluent 6-8 . The control strategies that are currently favored involve some form of end-of-pipe control entailing either phase transfer physical separation adsorption air steam stripping and condensation or chemical degradation destruction thermal incineration catalytic oxidation chemical oxidation and wet-air oxidation operations. A catalytic transformation of chlorinated waste represents an innovative end-of-process strategy that offers a means of recovering valuable raw material something that would be very difficult if not impossible to achieve with end-of-pipe technologies. The application of heterogeneous catalysis to environmental pollution control is a burgeoning area of research. This chapter will focus on one case study the gas-phase hydrodechlorination of chlorinated aromatics chlorobenzenes and chlorophenols promoted using supported nickel catalysts. Chlorinated benzenes phenols represent a class of commercially important world market in tens of thousands of tons but particularly toxic chemicals that enter the environment as industrial effluent from herbicide biocide production plants petrochemical units and oil refineries 9 10 . Haloarenes have been listed for some time by the EPA as priority pollutants 11 12 and targeted in terms of emission control. In response to such issues as climate change water protection and air quality the concept of a waste .

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