The catalyst can be used for catalyzing cellulose hydrolysis and dewatering to generate 5-hydroxymethylfurfural. The product has a multi-porous structure and can increase the specific area of the catalyst; the surface has vast super acids; the catalyst has excellent performance in catalyzing cellulose...
主要共振式的判别 3.最能代表重氮甲烷结构的Lewis结构式为 Which is an acceptable Lewis structure for diazomethane?A.B.C.D.的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷题,
References Antignano A, Manning CE (2008) Rutile solubility in H2O, H2O–SiO2, and H2O–NaAlSi3O8 fluids at 0.7–2.0 GPa and 700–1000 °C: implications for mobility of nominally insoluble elements. Chem Geol 255:283–293 Arai S (1975) Contact metamorphosed dunite-harzburgite...
Metathesis of ethylene and 2-butene over MoOx/Al2O3-SiO2: Effect of MoOx structure on formation of active sites and propene selectivity J. Catal. (2018) H. Zhu et al. Sn surface-enriched Pt–Sn bimetallic nanoparticles as a selective and stable catalyst for propane dehydrogenation J. Catal...
The evidence for the Al-doped MCM-41 structure was confirmed by XRD, IR, 27Al MAS NMR and 29Si MAS NMR results. Besides, 27Al MAS NMR revealed the existence of both Al framework and extra-framework. FTIR-pyridine adsorption demonstrated the formation of Brønsted and Lewis acidity, and ...
for 30 minutes. The annealed film had crystallized to the cubic tungsten structure and lost its nitrogen to become pure tungsten metal. EXAMPLE 4 Example 3 was repeated, except that the tungsten nitride film was deposited directly on silicon without an oxide interlayer produced by the UV-ozone...
Al2O3 or SiO2 particles with abundant surface hydroxyl groups can prevent side reactions of aromatic compounds with AlCl3 completely; this Lewis acid can potentially destroy the stable structure of aromatic compounds to a large extent. This discovery was successfully utilized in the highly efficient ...
La sites supported on silica (La-SiO2) with a similar chemical structure but no H-bonding interaction with Si–OH groups were prepared for comparison. Lewis acid La sites promote AcH aldol condensation, and the activity of such sites is nearly identical for both La-DeAlBEA and La-SiO2. The...
The experimental and calculated results have clarified the structure of nitroxide complexes with LASs and have led to an assessment of the impact of steric hindrance on the orientation and mobility of complex-bonded radicals. It has been demonstrated that the method is highly advantageous for the ...