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...
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...
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...
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Even though sion efficiency31 ManAdSlnoIw3 has been investigated as an alternative for lead-free perovskite, its low power conver- oxidation resistence30 are some motivatory hindrances to workaround through the euPt(ah1txsb.eepr3ioes0nootr fcueimrmaVdelyl)ateoe,snrymaeetsssvap.ettlFelhhayro...
FCuartathlyestrsm20o2r0e, 1, 0i,txcFaOnRbPeEsEeReRnEtVhIaEtWthe C-Mn-Fe-Ce-Al-O catalyst displays further weight losses in 7stoefp13 3 (600–800 °C) and no similar phenomenon can be observed for the Z-Mn-Fe-Ce-Al-O catalyst. As rteepsoterdtedineplsreewsehnecree,otfhHe d2Oeca...
Consequently, we took CH3O2 + NO [50] as a reaction analogy to estimate the rate coefficients for Reactions (7) and (8). NC3H7O2 + NO = NC3H7O + NO2 (7) IC3H7O2 + NO = IC3H7O + NO2 (8) 4. Results and Discussion 4.1. Potential Energy Surface (PES) Figure 1 ...
The presence of O2 could promote the conversion of NO to NO2, while NO2 was easier to reduce. The co-existence of NH3 and O2 resulted in the NH3 adsorption strength being lower, as compared to tests without O2, since O2 could occupy a part of the active site. Due to CeO2's ...
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 ...
To minimize the contact of the sample with atmospheric O2 and H2O, a vial containing a few milligrams of the borane was prepared in the glove box, taken out, and opened just before the measurement. The number of scans was fixed to 32 to avoid excessive contact with air. In such ...