Highly active and selective Ti-incorporated porous silica catalysts derived from grafting of titanium(iv)acetylacetonate

2015 ◽  
Vol 3 (29) ◽  
pp. 15280-15291 ◽  
Author(s):  
Miki Fukuda ◽  
Nao Tsunoji ◽  
Yuya Yagenji ◽  
Yusuke Ide ◽  
Shinjiro Hayakawa ◽  
...  
Keyword(s):  
Porous Silica ◽  
Butyl Hydroperoxide ◽  
Catalytic Activities ◽  
Highly Active

Ti(iv)acetylacetonate-grafted porous silicas showed high catalytic activities for the epoxidations of cyclohexene and limonene with tert-butyl hydroperoxide as an oxidant.

scholarly journals CoSb3 alloy nanoparticles wrapped with N-doped carbon layers as a highly active bifunctional electrocatalyst for zinc–air batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 33012-33019 ◽  
Author(s):  
Tian-bo Yang ◽  
Kai-Yuan Zhou ◽  
Guang-Yi Chen ◽  
Wan-Xi Zhang ◽  
Ji-Cai Liang
Keyword(s):  
Electrochemical Properties ◽  
Alloy Nanoparticles ◽  
Air Cathode ◽  
Bifunctional Electrocatalyst ◽  
Catalytic Activities ◽  
Highly Active ◽  
Air Battery ◽  
Zinc Air Batteries

CoSb3 nanoparticles wrapped with N-doped carbon layers have been prepared and showed excellent catalytic activities both for ORR and OER. A real rechargeable zinc–air battery with CoSb3@NCL-30 catalyst as air cathode exhibited outstanding electrochemical properties.

Synthesis of (NHC)Pd(salicylaldimine)Cl complexes through template-directed ortho-aromatic metaloxylation of NHC–palladacycles derived from arylimines

2017 ◽  
Vol 46 (15) ◽  
pp. 5003-5007 ◽  
Author(s):  
Jin Yang
Keyword(s):  
Butyl Hydroperoxide ◽  
Catalytic Activities ◽  
Aromatic Hydroxylation

NHC–palladacycles were ortho-aromatic metaloxylated in the presence of tert-butyl hydroperoxide, affording (NHC)Pd(salicylaldimine)Cl complexes. Furthermore, they also showed efficient catalytic activities toward the ortho-aromatic hydroxylation of arylimines.

Synthesis of half-titanocenes containing 1,3-imidazolidin-2-iminato ligands of type, Cp*TiCl2[1,3-R2(CH2N)2CN]: highly active catalyst precursors in ethylene (co)polymerisation

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64503-64513 ◽  
Author(s):  
Kotohiro Nomura ◽  
Srisuda Patamma ◽  
Hideshi Matsuda ◽  
Shohei Katao ◽  
Ken Tsutsumi ◽  
...  
Keyword(s):  
Active Catalyst ◽  
Catalytic Activities ◽  
Highly Active

Cp*TiCl2[1,3-(2,6-Me2C6H3)2(CH2N)2CN] showed remarkable catalytic activities for ethylene/1-hexene copolymerisation with efficient comonomer incorporation (ex. activity 1 750 000 kg-polymer per mol-Ti per h).

Hollow-structured Si/SiC@C nanospheres as highly active catalysts for cycloaddition of epoxides with CO2 under mild conditions

2016 ◽  
Vol 45 (6) ◽  
pp. 2369-2373 ◽  
Author(s):  
Mei-Pin Liu ◽  
Yan-Ping Luo ◽  
Lei Xu ◽  
Lin Sun ◽  
Hong-Bin Du
Keyword(s):  
Solvent Free ◽  
Chemical Fixation ◽  
Magnesiothermic Reduction ◽  
Catalytic Activities ◽  
Mild Conditions ◽  
Highly Active ◽  
Solvent Free Conditions

Hollow-structured Si/SiC@C nanospheres, prepared through magnesiothermic reduction, exhibit excellent catalytic activities for chemical fixation of CO2 under mild, solvent-free conditions.

scholarly journals Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 449
Author(s):  
Miguel Ródenas ◽  
Jamal El Haskouri ◽  
José Vicente Ros-Lis ◽  
M. Dolores Marcos ◽  
Pedro Amorós ◽  
...  
Keyword(s):  
Porous Silica ◽  
Catalytic Efficiency ◽  
Pd Nanoparticles ◽  
Hydrogenation Catalysts ◽  
Highly Active ◽  
Hierarchical Porous ◽  
Similar Materials ◽  
Comprehensive Comparison ◽  
Palladium Content

New catalysts based on Pd(0) nanoparticles (Pd NPs) on a bimodal porous silica of the UVM-7/polydopamine (PDA) support have been synthesized following two preparative strategies based on the sequential or joint incorporation of two components of the composite (Pd and PDA). We analyzed the role played by the PDA as ‘interfacial glue’ between the silica scaffold and the Pd NPs. The catalysts were tested for the hydrogenation of 4-nitrophenol using (NEt4)BH4 as the hydrogenating agent. In addition to the palladium content, the characterization of the catalysts at the micro and nanoscale has highlighted the importance of different parameters, such as the size and dispersion of the Pd NPs, as well as their accessibility to the substrate (greater or lesser depending on their entrapment level in the PDA) on the catalytic efficiency. Staged sequential synthesis has led to better catalytic results. The most active Pd(0) centers seem to be Pd NPs of less than 1 nm on the PDA surface. The efficiency of the catalysts obtained is superior to that of similar materials without PDA. A comprehensive comparison has been made with other catalysts based on Pd NPs in a wide variety of supports. The TOF values achieved are among the best described in the literature.

Synthesis, Characterization and Catalytic Performance of Titanium-Modified TUD-1 in the Hydrodesulfurization of FCC Diesel

2014 ◽  
Vol 898 ◽  
pp. 56-59
Author(s):  
Jian Ye Fu ◽  
Ai Jun Duan ◽  
Zhen Zhao ◽  
Gui Yuan Jiang ◽  
Jian Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Mesoporous Material ◽  
Catalytic Performance ◽  
Catalytic Activities ◽  
Molar Ratios ◽  
Highly Active ◽  
Micro Reactor ◽  
Better Than

Highly active titanium modified 3D mesoporous material Ti-TUD-1 with different Si/Ti molar ratios (10, 25, 50 and 100) were synthesized using TEA as a template and TEAOH as an auxiliary template. The Ti-TUD-1 materials were characterized by means of XRD, TEM and UV-vis DRS. The results showed that Ti was successfully incorporated in the framework of TUD-1 by forming Ti-O-Si bonds. The catalytic activities were tested in a high pressure micro reactor using FCC diesel and the results showed that the HDS efficiency of Ti modified TUD-1(Si/Ti=50) was better than TUD-1, as high as 98.15%.

High chemiluminescence activity of an FeIII–TAML activator in aqueous–organic media and its use in the determination of organic peroxides

The Analyst ◽  
2015 ◽  
Vol 140 (9) ◽  
pp. 2964-2968 ◽  
Author(s):  
Alexandra S. Demiyanova ◽  
Ivan Yu. Sakharov
Keyword(s):  
Benzoyl Peroxide ◽  
Organic Solvents ◽  
Organic Media ◽  
Organic Peroxides ◽  
Peroxidase Mimic ◽  
Butyl Hydroperoxide ◽  
Highly Active

Using FeIII–TAML, highly active peroxidase mimic, the sensitive chemiluminescence assays for the determination of benzoyl peroxide and tert-butyl hydroperoxide in the presence of organic solvents were developed.

scholarly journals Fe3+-Exchanged Titanate Nanotubes: A New Kind of Highly Active Heterogeneous Catalyst for Friedel-Crafts Type Benzylation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Yunchen Du ◽  
Di Guo ◽  
Meiling Xiong ◽  
Yanwu Qi ◽  
Chenkui Cui ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Catalyst Support ◽  
Environmental Benefits ◽  
Titanate Nanotubes ◽  
Catalytic Activities ◽  
Highly Active ◽  
Active Metal ◽  
Benzylation Of Benzene

Heterogeneous catalysis for Friedel-Crafts type benzylation has received much attention in recent years due to its characteristic of environmental benefits. In this paper, titanate nanotubes (TNTs) were employed as heterogeneous catalyst support, and a new kind of Fe3+-exchanged titanate nanotubes (Fe-TNTs) catalyst with highly dispersed ferric sites was constructed by an ion exchange technique. The obtained catalyst was systematically characterized by XRD, TEM, N2adsorption, XPS, and UV-vis spectra. As expected, Fe-TNTs showed excellent catalytic activities in the benzylation of benzene and benzene derivatives. The recycling tests for Fe-TNTs were also carried out, where the reason for the gradually decreased activity was carefully investigated. Superior to some reported catalysts, the catalytic ability of used Fe-TNTs could be easily recovered by ion exchange again, indicating that Fe-TNTs herein were a highly active and durable heterogeneous catalyst for Friedel-Crafts type benzylation. These results might be helpful for the design and preparation of novel heterogeneous catalysts by combining the structural advantages of titanate nanotubes and active metal ions.

Porous Silica-Coated Gold Nanorods: A Highly Active Catalyst for the Reduction of 4-Nitrophenol

ChemPhysChem ◽  
2016 ◽  
Vol 17 (3) ◽  
pp. 364-368 ◽  
Author(s):  
Jagdeep Mohanta ◽  
Smithsagar Satapathy ◽  
Satyabrata Si
Keyword(s):  
Gold Nanorods ◽  
Active Catalyst ◽  
Porous Silica ◽  
Highly Active

Recent Advances in Heterogeneous Ir Complex Catalysts for Aromatic C-H Borylation

Synthesis ◽  
2021 ◽  
Author(s):  
Kyogo Maeda ◽  
Ken Motokura
Keyword(s):  
Coupling Reaction ◽  
Short Review ◽  
Complex Catalyst ◽  
Arylboronic Acids ◽  
Catalytic Activities ◽  
Ligand Structure ◽  
Highly Active ◽  
Cross Coupling Reaction ◽  
Support Surfaces ◽  
Significant Effort

Aromatic C–H borylation catalyzed by an Ir complex is among the most powerful methods for activating inert bonds. The products, i.e., arylboronic acids and their esters, are usable chemicals for the Suzuki–Miyaura cross-coupling reaction, and significant effort has been directed toward the development of homogeneous catalysis chemistry. In this short review, we present a recent overview of current heterogeneous Ir-complex catalyst developments for aromatic C–H borylation. Not only have Ir complexes been immobilized on support surfaces with phosphine and bipyridine ligands, but Ir complexes incorporated within solid materials have also been developed as highly active and reusable heterogeneous Ir catalysts. Their catalytic activities and stabilities strongly depend on their surface structures, including linker length and ligand structure.

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