| 1. | Sulfur is a gasoline catalyst poison,
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| 2. | Thus there is no accumulation of catalyst poisons, and the elaborate fine purification of the syngas can be omitted.
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| 3. | Potential catalyst poisons coming from the synthesis gas migrate into the organic phase and removed from the reaction with the aldehyde.
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| 4. | Lead is a " catalyst poison " and would effectively disable a catalytic converter by forming a coating on the catalyst's surface.
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| 5. | Ammonia synthesis also has a strict requirement of CO-free syngas, as CO is a strong catalyst poison for the usual catalysts used in this process.
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| 6. | In some of these cases, the addition of a small amount of a catalyst poison increase the yield of the desired product by lower the catalyst activity.
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