scholarly journals Synthesis and catalytic performance in the propene epoxidation of a vanadium catalyst supported on mesoporous silica obtained with the aid of sucrose

2017 ◽  
Vol 41 (8) ◽  
pp. 2955-2963
Author(s):  
Ewa Janiszewska ◽  
Stanislaw Kowalak
Keyword(s):  
Mesoporous Silica ◽  
Propylene Oxide ◽  
Catalytic Performance ◽  
Vanadium Catalyst ◽  
Vanadium Catalysts

Sucrose is an effective template for mesoporous silica—an efficient support of vanadium catalysts, active in propene epoxidation to propylene oxide.

scholarly journals The design, synthesis and catalytic performance of vanadium-incorporated mesoporous silica with 3D mesoporous structure for propene epoxidation

RSC Advances ◽  
2020 ◽  
Vol 10 (17) ◽  
pp. 10144-10154
Author(s):  
Agnieszka Held ◽  
Ewa Janiszewska ◽  
Justyna Czerepińska ◽  
Jolanta Kowalska-Kuś
Keyword(s):  
Mesoporous Silica ◽  
3D Structure ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Design Synthesis ◽  
Vanadium Catalysts

Novel promising vanadium catalysts based on mesoporous silica of 3D structure, namely KIT-6, SBA-12, and MCF, for the direct propene epoxidation with N2O.

Propylene Epoxidation to Propylene Oxide Over RuO2, CuO, TeO2, and TiO2 Supported on Modified Mesoporous Silicas

2020 ◽  
Vol 20 (6) ◽  
pp. 3466-3477 ◽  
Author(s):  
Surached Thongboon ◽  
Pacharaporn Rittiron ◽  
Danusorn Kiatsaengthong ◽  
Thanaphat Chukeaw ◽  
Anusorn Seubsai
Keyword(s):  
Mesoporous Silica ◽  
Propylene Oxide ◽  
Formation Rate ◽  
Porous Silica ◽  
Catalytic Performance ◽  
Bet Surface Area ◽  
Active Components ◽  
Propylene Epoxidation ◽  
Epoxidation Of Propylene ◽  
Silica Supports

Direct gas phase epoxidation of propylene to propylene oxide (PO) using O2 is a challenging problem in catalysis research. Silica-supported ruthenium-copper-based catalysts have been recently reported to be promising for propylene epoxidation. In this work, mesoporous silica supports modified with RuO2, CuO, and TeO2 with and without TiO2 were investigated for propylene epoxidation to PO. The prepared catalysts were divided into two groups. The first group consisted of mesoporous silica supports modified with RuO2, CuO, and TeO2, and the second group consisted of the same components as the first group but adding TiO2. The prepared supports and catalysts were characterized using BET surface area analysis and other advanced instrument techniques. It was found that the catalyst made with RuO2 and TeO2 impregnated onto porous silica modified with CuO and TiO2 (denoted as RuTe/CuTiSi) exhibited an excellent PO formation of 344 gPO h−1 kg−1cat, which was superior to that of the other prepared catalysts. Moreover, the addition of TiO2 into the catalyst greatly improved the PO formation rate and the arrangement of active components in the catalyst and strongly influenced catalytic performance.

scholarly journals Dual Stimuli-Responsive Copper Nanoparticles Decorated SBA-15: A Highly Efficient Catalyst for the Oxidation of Alcohols in Water

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2051
Author(s):  
Anju Maria Thomas ◽  
Jerome Peter ◽  
Saravanan Nagappan ◽  
Anandhu Mohan ◽  
Chang-Sik Ha
Keyword(s):  
Mesoporous Silica ◽  
Copper Nanoparticles ◽  
Catalytic Performance ◽  
Solution Temperature ◽  
Stimuli Responsive ◽  
Hybrid Catalyst ◽  
Ph Responsive ◽  
Efficient Catalyst ◽  
13C Nuclear Magnetic Resonance ◽  
Alcohol Conversion

In the present work, a temperature and pH-responsive hybrid catalytic system using copolymer-capped mesoporous silica particles with metal nanoparticles is proposed. The poly(2-(dimethylamino)ethyl methacrylate)(DMAEMA)-co-N-tert-butyl acrylamide) (TBA)) shell on mesoporous silica SBA-15 was obtained through free radical polymerization. Then, copper nanoparticles (CuNPs) decorated SBA-15/copolymer hybrid materials were synthesized using the NaBH4 reduction method. SBA-15 was functionalized with trimethoxylsilylpropyl methacrylate (TMSPM) and named TSBA. It was found that the CuNPs were uniformly dispersed in the mesoporous channels of SBA-15, and the hybrid catalyst exhibited excellent catalytic performance for the selective oxidation of different substituted benzyl alcohols in water using H2O2 as an oxidant at room temperature. The dual (temperature and pH-) responsive behaviors of the CuNPs/p(DMAEMA-co-TBA)/TSBA catalyst were investigated using the dynamic light scattering technique. The conversion of catalytic products and selectivity were calculated using gas chromatographic techniques, whereas the molecular structure of the products was identified using 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. The catalyst showed excellent catalytic activity toward the oxidation of alcohol to aldehyde in an aqueous medium below the lower critical solution temperature (LCST) and pKa values (7–7.5) of the copolymer. The main advantages of the hybrid catalyst, as compared to the existing catalysts, are outstanding alcohol conversion (up to 99%) for a short reaction time (1 h), small amount of the catalyst (5 mg), and good recyclability equal to at least five times.

Improved catalytic performance of lipase under non-aqueous conditions by entrapment into alkyl-functionalized mesoporous silica

2019 ◽  
Vol 43 (1) ◽  
pp. 364-370 ◽  
Author(s):  
Wen-Bin Jin ◽  
Yan Xu ◽  
Xiao-Wei Yu
Keyword(s):  
Mesoporous Silica ◽  
Catalytic Performance ◽  
Functionalized Mesoporous Silica ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Aqueous Conditions

Immobilizing lipase r27RCL into octadecyl-functionalized mesoporous silica materials significantly improved the activity and enantioselectivity of the lipase.

Rh nanoclusters encaged in hollow mesoporous silica nanoreactors with enhanced catalytic performance for phenol selective hydrogenation

2020 ◽  
Vol 397 ◽  
pp. 125484 ◽  
Author(s):  
Peijian Yan ◽  
Pengfei Tian ◽  
Kaijie Li ◽  
Martien A. Cohen Stuart ◽  
Junyou Wang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Selective Hydrogenation ◽  
Catalytic Performance ◽  
Hollow Mesoporous Silica
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