Which of the following is not true? O Catalytic converters facilitate both oxidation and reduction reactions simultaneously. O Carbon-based compounds (usually CO and hydrocarbons) are reduced in a catalytic converter to yield CO2 and H20. Reduction of the nitrogen in NO (to yield N2 and O2) is energetically favorable, but because the activation energy is high, the reaction must either be catalyzed or done at high temperatures to proceed at an appreciable rate. Catalytic converters that reduce the nitrogen in NO can also reduce the sulfur in SO2, resulting in production of the toxic gas H2S when sulfur is present in the fuel. CO and other incompletely oxidized forms of carbon are produced in greater quantities when gasoline is combusted with inadequate oxygen present.

Which of the following is not true? O Catalytic converters facilitate both oxidation and reduction reactions simultaneously. O Carbon-based compounds (usually CO and hydrocarbons) are reduced in a catalytic converter to yield CO2 and H20. Reduction of the nitrogen in NO (to yield N2 and O2) is energetically favorable, but because the activation energy is high, the reaction must either be catalyzed or done at high temperatures to proceed at an appreciable rate. Catalytic converters that reduce the nitrogen in NO can also reduce the sulfur in SO2, resulting in production of the toxic gas H2S when sulfur is present in the fuel. CO and other incompletely oxidized forms of carbon are produced in greater quantities when gasoline is combusted with inadequate oxygen present.

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 23Q: Monochloroethane (C2H5Cl) can be produced by the direct reaction of ethane gas (C2H6) with chlorine...

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Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?
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Monochloroethane (C2H5Cl) can be produced by the direct reaction of ethane gas (C2H6) with chlorine gas or by the reaction of ethylene gas (C2H4) with hydrogen chloride gas. The second reaction gives almost a 100% yield of pure C2H5Cl at a rapid rate without catalysis. The first method requires light as an energy source or the reaction would not occur. Yet G for the first reaction is considerably more negative than G for the second reaction. Explain how this can be so.
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