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首页> 美国政府科技报告 >Sorption and Catalytic Destruction of Chlorinated VOCs Using Fresh and Dealuminated Y and ZSM-5 Zeolites
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Sorption and Catalytic Destruction of Chlorinated VOCs Using Fresh and Dealuminated Y and ZSM-5 Zeolites

机译：新鲜脱铝Y和Zsm-5分子筛吸附和催化消除氯化挥发性有机化合物

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Chlorinated volatile organic compounds (CVOCs) released from water treatment operations (aeration, air stripping, and aerobic biodegradation) are a major source of air pollution. Current technology for recycling or conversion of CVOCs involves carbon absorption followed by stream stripping and destruction using thermal or catalytic means. This process is not only expensive, but also energy and equipment intensive. Considerable economy and efficiency could be affected by utilizing a single dual-function medium capable of catalytically converting them into less harmful products at high temperatures. The primary aspect of this study was the investigation of zeolite adsorbents, mostly of the ZSM-5 type for their CVOC sorption properties, particularly the sorption of trichlorethylene (TCE), the CVOC of principal interest. Results showed that, due to the competitive adsorption of water, the absorption of TCE decreased significantly. While the presence of presorbed CVOC did not affect subsequent TCE sorption, the dry TCE capacity of chromium-exchanged H-ZSM-5 was considerably reduced with water presaturation of the sorbent. The presence of different exchanged cations in the zeolitic structure did not affect humid TCE sorption levels except with cobalt-exchanged H-ZSM-5 where a significant decrease was noticed.

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