Meanwhile, CeO2 had certain Lewis basicity. In other words, CeO2 as the active component would decrease the surface acidity of Ce-Al-Ox catalyst to a certain extent. On the contrary, the weak basictity of Al2O3 could promote the adsorption and activation of SO2 on Ce-Al-Ox catalyst. ...
3b and all major Lewis resonance structures and their abundances are shown in Fig. S3 (see ESI). For structure e′, like the interactions between anionic NHCs and CO2 in the presence of Li+22, pyrrolide donates its lone pair to SO2 to form a N-S σ single bond (Fig. 3a). The ...
Lewis structures are models for predicting molecular structure, not electronic structure. J. Chem. Educ. 1999, 76, 1013. [CrossRef] 38. Vasconcelos, J.M.; Orvalho, S.P.; Alves, S.S. Gas–liquid mass transfer to single bubbles: Effect of surface contamination. AIChE J. 2002, 48, 1145...
The high-temperature peak (i.e., 300 °C) is attributed to the desorption of NH3 from Brønsted acid sites and also partly to the contribution from NH3 stored on strong Lewis acid sites, i.e., ion-exchanged Cu sites [35]. Interestingly, the capacities for NH3 storage were greatly ...
过渡金属离子掺杂CeO2 -SO2-4固体酸的结构、redox性能、吸附性能及NH3 -SCR活性研究江洋,司知蠢吴晓东 马静马子然尉文超,翁端清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室,北京 100084摘要:通过溶胶凝胶法制备了Cux+,Fex+,Nix+和Zrx+掺杂的CeO2-SO2-4固体酸NH3-SCR催化剂。利用XRD,IR,NH3 -TPD,...
H2O inhibited the SCR reaction due to its competitive adsorption with NH3 on the Lewis sites [27,28]. According to the theory of ionic polarization [29], the formation of a metal sulfate can be regarded as the inverse process of metal sulfate decomposition (Equation (1)). If MeSO4 is ...
R∨C)L.55 No,1 E M E M B E R I N G 241h:nfontry Division Associolon FIRST TO FICHT Tlaro Lea Morch 2001 24th lnfan Division Association President James F.HiH 260 Shelli LN Roswell GA 30075‐ 2967 Tel.770‑998‑3749 Vicc President Bil:y ...
Summarizing, the deposition of Pd to the La2O3- CeO2- TiO2-Al2O3 system leads to a decrease in the specific surface area, accompanied by an increase in the average pore diameter from 4.9 nm to about 8 nm, the pore-size distribution being transformed from a mono- to bimodal structure....
And, the other two peaks represent the NH4+ adsorbed by Bronsted acid (around 150 °C) and the coordinated NH3 bound to the Lewis acid sites (around 280 °C) [28]. According to the total NH3 consumption, it can be found that the minimum NH3 consumption of the supported Ce/SBA ...