Abstract
The catalytic destruction of cyanogen chloride (CNCI) in air has been investigated in a fixed-bed microreactor using a 2.15% Pt/α-alumina catalyst. If the feed stream contains water vapor, CNCl conversion as high as 98% can be achieved at 375°C and 170 000 cm 3 h −1 g −1 space velocity. In contrast, the CNCl conversion in a dry inlet gas stream is 20% at 440°C and 46 000 cm 3 h −1 g −1 space velocity. Water vapor in the feed stream significantly enhances the conversion of CNCl by providing an alternate hydrolysis pathway for destruction. It also promotes the complete conversion of CNCl to CO 2 and HCl with negligible selectivity to CO and Cl 2. The CNCl conversion decreases with increasing concentration in the feed stream. A kinetic model of the form r = kC a/1(1 + K pC p) adequately represents the data in the presence of water vapor.
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