Using CH4 and steam as a source of H2 for NH3 synthesis requires high temperatures
Chapter 17, Problem 17.99(choose chapter or problem)
Using CH4 and steam as a source of H2 for NH3 synthesis requires high temperatures. Rather than burning CH4 separately to heat the mixture, it is more efficient to inject some O2 into the reaction mixture. All of the H2 is thus released for the synthesis, and the heat of reaction for the combustion of CH4 helps maintain the required temperature. Imagine the reaction occurring in two steps: 2CH4(g) 1 O2(g) BA 2CO(g) 1 4H2(g) Kp 5 9.3431028 at 1000. K CO(g) 1 H2O(g) BA CO2(g) 1 H2(g) Kp 5 1.374 at 1000. K (a) Write the overall equation for the reaction of methane, steam, and oxygen to form carbon dioxide and hydrogen. (b) What is Kp for the overall reaction? (c) What is Kc for the overall reaction? (d) A mixture of 2.0 mol of CH4, 1.0 mol of O2, and 2.0 mol of steam with a total pressure of 30. atm reacts at 1000. K at constant volume. Assuming that the reaction is complete and the ideal gas law is a valid approximation, what is the final pressure?
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