Lewis/Bronsted acid hybridSulfated bimetallicKIT-6Mesoporous silicaA series of mesoporous composites of SO4/Al-Zr/KIT-6, with varied ratios of ZrO2 to Al2O3 and degrees of sulfation have been synthesized as an efficient, clean, facile and environmental-friendly nano-catalyst for the selective ...
KD Karlin,HN Rabinowitz,DL Lewis,... - 《Inorganic Chemistry》 被引量: 44发表: 1977年 Synthesis and characterization of (η1 : η5-C5H4)-bridged group IV metallocene derivatives. X-ray structure of {Cp(μ-[η1 : η5-C5H4])Ti[PMe3]}2 Reduction of Cp 2MCl 2 (M = Ti, Zr and...
It was found that anhydrous CuSO4 served as critical Lewis catalyst28 for the conversion of ribonolactone to 2,3-O-isopropylidene-d-ribonolactone. Although relatively high yield (72%) was achieved, the CuSO4 is hard to be fully recovered due to its excellent solubilty in water. Marek Marczews...
Also, according to acid–base Lewis chemical reactions, by virtue of Ta's position in the periodic table, tantalum is more acidic than vanadium. Thus, the ZrO2–Ta2O5 is expected to be substantially more resistant to corrosion by the acidic oxides than ZrO2–Y2O3. According to Raghavan et ...
The N−S bond length is 1.915(1) Å, and the NSO angle is 98.91(2)o, indicating that the formation of the dative bond is nearly, but not entirely, complete. Small but significant changes in the heavy-atom ring structure of the pyridine upon complexation are also measured by a ...
Lewis acid sites .T he Bronst ed acid is medium streng th and w eak ,and the L ew is acM is mostly med ium strength and litt le st.rong.Because of its surface acidit y and b ig po re structure ,C oA PS O 一5 show s a good catalit ic property of t oluene ...
Which of the following compounds would require a Lewis structure that shows electrons were transferred (ionic) instead of being shared (covalent)? A. Al_2S_3 B. NO_2 C. CO_2 D. SF_6Which of the following ...
structure (organic substancesThe behavior of the 1,5-diphosphadithiatetrazocine (I) toward Lewis and Bronsted acids is investigated.doi:10.1002/chin.199002249Tristram ChiversGeorges Y. DenesStephen W. LiblongJohn F. RichardsonAmerican Chemical SocietyChemInform...
The adsorption of polar molecules, as water and ammonia, causes marked structure destruction, and the colour changes from blue to pink or to grey shades. P OH groups and Lewis acid sites are detected by infrared spectroscopy.doi:10.1016/0927-6513(96)00018-1U. Lohse...