尿素的水解反应如下:CO(NH2)2+H2Orarr;2NH3+CO2 无酶存在时反应的活化能为120kJmiddot;mol-1。当尿素酶存在时,反应的活化能降为46kJmiddot;mol-1。设有、无酶存在时反应的频率因子A值相同。 试计算: (1)在298K时,由于尿素酶的催化作用,反应速率是无酶存在时的多少倍? (2)无酶存在时,温度要升高到何...
4NH3 + 5O2 rarr 4NO + 6H2O Given: Ammonia used in the reaction = 100 cm^3 From the equation, 4 vol. of NH3 requires 5 vol. of O2 for its oxidation. :. 1 vol. will require = 5/4 Thus 100 cm^3 of ammonia will require =5/4 xx 100 = 125 cm^3 of o
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The standard NH3-SCR utilizes NH3 as a reductant to remove NOx as follows: 4NH3 + 4NO + O2 = 4N2 + 6H2O. The main products are N2 and H2O, while the by-products are NO2 and N2O. Herein, at low temperatures (<350 ◦C), the standard NH3-SCR is the dominant reaction, ...
4NH3 + 4NO + O2→4N2 + 6H2O (2) 4NH3 + 2NO2 + O2→3N2 + 6H2O (3) 4NH3 + 6NO→5N2 + 6H2O (4) 8NH3 + 6NO2→7N2 + 12H2O (5) According to "standard SCR" and "fast SCR" Equations (2) and (3) [32], the SCR reaction occurs more quickly in the presence of...
Use the standard reaction enthalpies given below to determine Delta H degrees rxn for the following reaction: 2 NO(g) + O2(g) ? 2 NO2(g) Delta H degrees rxn=? Given: N2(g)+O2(g)? 2 NO(g) Delta H degre The enthalpy ...
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In the absence of O2, the reducing agent cannot reduce NO. When the oxygen content of the exhaust is below 5%, the catalytic reduction reaction of NH3 can be carried out to convert NOx into N2 and H2O. When the oxygen concentration is too high, the activity of the catalyst will be ...