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Nitrogen_Cycle_and_Acid_Rain_-_Lect07_S10

Nitrogen_Cycle_and_Acid_Rain_-_Lect07_S10 - Nitrogen Cycle...

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1 Nitrogen Cycle and Acid Rain Advanced Environmental Geochemistry – Lecture 7 Spring 2010
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2 Natural Nitrogen Fixation
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3 Formation of Nitrogen Dioxide
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4 Formation of Nitric Acid
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5 Catalytic Reduction of Nitrogen Oxide, I
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6 Catalytic Reduction of Nitrogen Oxide, II
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7 Catalytic Reduction of Nitrogen Oxide, III
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8 By-Product Formation Carbonyl sulfide (COS) is toxic “Cure” is worse than the problem
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9 Tyco Modified Sulfuric-Acid Scrubbing Process Four step process Each step is shown on successive slides
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10 Oxidizer Stack gas plus NO 2
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11 Scrubber NO from the oxidizer plus additional NO 2 react to form N 2 O 3
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12 Scrubber: Removal of Nitrogen Oxides
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13 Decomposer Scrubbed stack gases are vented to the atmosphere Sulfuric acid is regenerated
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14 Nitric Acid Reactor Scrubbed nitric oxides are converted to nitric acid
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15 Connection of Sulfur and Nitrogen Cycles Presence of ammonia or ammonium ion in aerosols ties the atmospheric nitrogen and sulfur cycles together Reactions may create ammonium sulfate or ammonium nitrate aerosols
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16 Ammonium Sulfate Formation
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17 Ammonium Nitrate Formation
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18 Nitrogen Cycle
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