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...
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
Complete the following. 2XeF_6 + 6H_2O rarr View Solution The colour of FeSO_4.(NH_4)_2SO_4 6H_2O is: View Solution For the reaction,4NH3+5O2→4NO+6H2OThe rate of formation of No is3.6×10−3molL−1s−1Calculate the disappearance ofNH3and rate of formation ofH2O. View ...
15、的氧化态一般大于3; 而常见的配体主要是F、O2、CN、NO3、NCS、H2O等。3.2.2 高配位数配合物 八配位的几何构型有五种基本方式: 其中最常的是四方反棱柱体和十二面体。 四方反棱柱体 十二面体 立方体 双帽三角棱柱体 六角双锥 九配位的理想几何构型是三帽三角棱柱体, 即在三角棱柱的三个矩形柱面中心的...
Adding Pd meshed with C, N element to TiO2 based NFs might contribute to generation of Lewis acid sites and Brønsted acid sites, which have been recently shown to enhance NH3 adsorption-desorption ability; Pd NPs could increase the quantity of adsorbed O2 on the surface of TiO2 based NFs...
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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 ...
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 ...
Calculate the enthalpy of formation (kJ/mol) of O2(g). The enthalpy of reaction for the equation as written is -1530.54 kJ/mol. If the answer is negative, enter the sign and then the magnitude. 4 NH3(g) + 3 O2(g) \right...