Method for treating gas containing organohalogen compounds, and catalyst for decomposing the organohalogen compounds
First Claim
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1. A method for treating gas containing organohalogen compounds, comprising the step of:
- making a catalyst, containing titania and tungsten oxide, and contacting said catalyst with the gas containing an organohalogen compound at a temperature lower than 500°
C. in the presence of steam to decompose the organohalogen compound into carbon monoxide, carbon dioxide, and hydrogen halides, whereinsaid catalyst contains titania, silica, and tungsten oxide, and the surface of titania in said catalyst is coated with porous layers made of silica and tungsten oxide,content of silica in said catalyst is approximately 0.5-15 parts by weight to 100 parts by weight titania, andthe Ti and W are present in the amount of 20 mol %-95 mol % Ti and 80 mol %-5 mol % W based on Ti and W.
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Abstract
A method for treating a gas flow containing organohalogen compounds including the steps of contacting the gas flow with a catalyst at a temperature below 500° C. in the presence of an effective amount of steam, wherein the catalyst contains titania, tungsten oxide, and silica, the Ti and W are present in the range of 20-95 mol % Ti and 5-80 mol % W based on Ti and W, and the amount of silica is in the range of 0.5-15% by weight silica to 100% by weight titania. Accordingly, the organohalogen compound can be decomposed effectively to carbon monoxide, carbon dioxide, and hydrogen halide.
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Citations
10 Claims
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1. A method for treating gas containing organohalogen compounds, comprising the step of:
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making a catalyst, containing titania and tungsten oxide, and contacting said catalyst with the gas containing an organohalogen compound at a temperature lower than 500°
C. in the presence of steam to decompose the organohalogen compound into carbon monoxide, carbon dioxide, and hydrogen halides, whereinsaid catalyst contains titania, silica, and tungsten oxide, and the surface of titania in said catalyst is coated with porous layers made of silica and tungsten oxide, content of silica in said catalyst is approximately 0.5-15 parts by weight to 100 parts by weight titania, and the Ti and W are present in the amount of 20 mol %-95 mol % Ti and 80 mol %-5 mol % W based on Ti and W. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification