Different characterization techniques were used to evaluate the immobilization and acidic properties of Keggin structured Tungstophosphoric (TPA) and molibdophosphoric (MPA) acids impregnated on an amine-functionalized SiMCM-41 support.XRD,FT i.r.,~31P MAS NMR measurements and evaluation of acidity ...
The incorporation of the rare-earth complex [C5H5NC16H33][Eu(TTA)4] into surface-modified mesoporous molecular sieve SiMCM-41 via reactions of the surface SiOH with different silylation agents such as (C2H5O)3Si(CH2)2NH(CH2)2NH2 (NSED), (C2H5O)3Si(CH2)3NH2 (APTES), and (C2H5O)3...
∴35°(1)∴CM+CN=2+2.5+1.5=9.5,(2)∴(3)∴∴△ADE\backsim△CPD(4)b=2e,b=e,b(5)=-1/4+4+41/4+1/4+1+√3 相关知识点: 试题来源: 解析 (1)C(2)D(3)A(4)1+1=1(5)1+1+1+1+1+1+1+1+1+1+3+1 反馈 收藏
1.用竖式计算。⊙O_1C\backsim ∵cmco,cocmacm 4+35=96-24=87-82=28+41=⊙O ∴v=v⋅v,v=v_0 ∴v=v⋅v⋅v⋅v⋅v⋅v⋅v⋅v⋅v⋅v⋅v⋅ ∴v=v⋅v=v⋅v,v=v 相关知识点: 试题来源: 解析 87-82=5 28+41=69 8 7 -8 2 5 (-4)/68/9 1.4+35=...
Different characterization techniques were used to evaluate the immobilization and acidic properties of Keggin structured Tungstophosphoric (TPA) and molibdophosphoric (MPA) acids impregnated on an amine-functionalized SiMCM-41 support. XRD, FTi.r., ~(31)P MAS NMR measurements and evaluation of ...
Different characterization techniques were used to evaluate the immobilization and acidic properties of Keggin structured Tungstophosphoric (TPA) and molibdophosphoric (MPA) acids impregnated on an amine-functionalized SiMCM-41 support. XRD, FT i.r., P-31 MAS NMR measurements and evaluation of ...
The SiMCM-41 support possessed very large surface area, leading to enhanced dispersion and specific surface area of Ni nanoparticles. As a result, the 15Ni/SiMCM-41 catalyst exhibited the highest activity. Based on the investigation of reaction pathways, it is important to emphasize that both ...
ZnO/SiMCM-41 and Fe 2 O 3 /SiMCM-41 showed high activity in DPC synthesis. Although many other metal oxides, such as La 2 O 3 , CuO, Al 2 O 3 and alkali or alkaline earth oxide, were success in destruction of CCl 4 , they displayed nearly no activity on DPC synthesis. ZnO/...
Beckmann rearrangement over phosphotungstic acid/SiMCM-41 cyclohexanone oxime to ε-caprolactam[J] . R Maheswari,K Shanthi,T Sivakumar,Sankarasubbier Narayanan.Applied Catalysis A, General . 2003 (1)R. Maheswari等.Beckmann rearrangement over phosphotungstic acid/SiMCM-41 cyclohexanone oxime to ε-...
1992年Mobil公司首次报道了孔径在2~10nm之间的人工合成中孔MCM-41系分子筛,无论作为催化剂还是主客体化学的主体,都有着诱人的应用前景.但目前需要解决的重要问题之一是提高其水热稳定性.本文首次研究了将稀土La引入中孔SiMCM-41中的合成,并讨论其水热稳定性,实验结果表明La(Ⅲ)的引入可明显地改善MCM-41的水热...