Construction of unique six-coordinated titanium species with an organic amine ligand in titanosilicate and their unprecedented high efficiency for alkene epoxidation

2015 ◽  
Vol 51 (43) ◽  
pp. 9010-9013 ◽  
Author(s):  
Le Xu ◽  
Da-Ding Huang ◽  
Chen-Geng Li ◽  
Xinyi Ji ◽  
Shaoqing Jin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Efficiency ◽  
High Catalytic Activity ◽  
Organic Amine ◽  
Amine Ligand

An organic–inorganic titanosilicate with an amine ligand shows high catalytic activity, selectivity and recyclability in alkene epoxidation.

Catalytic activity of dithioic acid copper complexes in the alkyne–azide cycloaddition

2013 ◽  
Vol 91 (4) ◽  
pp. 292-299 ◽  
Author(s):  
Bayardo E. Velasco ◽  
Gustavo López-Téllez ◽  
Nelly González-Rivas ◽  
Iván García-Orozco ◽  
Erick Cuevas-Yañez
Keyword(s):  
Catalytic Activity ◽  
Copper Complex ◽  
Copper Complexes ◽  
Functional Group ◽  
High Efficiency ◽  
High Catalytic Activity ◽  
Different Temperatures ◽  
High Yields

Diverse dithioic acid copper complexes exhibit a high catalytic activity in the copper-catalyzed alkyne–azide cycloaddition using several solvents under different temperatures, showing a high efficiency with only 0.005 mmol catalyst/mmol alkyne or less. A dithioic acid copper complex derived from acetophenone was selected and used as the catalyst in the preparation of a library of 1,4-disubstituted-1,2,3-triazoles. This process occurred in high yields and good functional group tolerance.

Selective isomerization of epoxides using magnetically recyclable ZSM-5 zeolite catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (96) ◽  
pp. 78441-78447 ◽  
Author(s):  
Phan Huy Hoang ◽  
Bach Nguyen Xuan
Keyword(s):  
Catalytic Activity ◽  
High Efficiency ◽  
Zeolite Catalyst ◽  
Isomerization Reaction ◽  
High Catalytic Activity ◽  
Long Lifetime

The magnetically recyclable ZSM-5 zeolite (MZZ) with high catalytic activity, high efficiency in separation, recycling and long lifetime for epoxide isomerization reaction was presented.

scholarly journals Facile synthesis of biomass-based carbon materials nano-Ni-based catalysts and its application in selective hydrogenation of alkynes

2021 ◽  
Author(s):  
Jianguo liu ◽  
Jiangmin Sun ◽  
Longlong Ma
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Carbon Material ◽  
Large Scale ◽  
High Efficiency ◽  
Environmentally Friendly ◽  
Metal Catalyst ◽  
High Catalytic Activity ◽  
Chemical Research ◽  
Nickel Metal

The development of high efficiency, excellent selectivity, and super activity metal catalyst for chemical selective hydrogenation of alkynes to olefin is of great significance in the field of the chemical industry. At the same time, the development of a large number of available base metal catalysts for organic conversion remains an important objective of chemical research. Herein, we report a facile preparation of a simple, high catalytic activity, environmentally friendly, and inexpensive biomass carbon material supported nano-nickel catalyst from lignin residue. The entire preparation process of the catalyst is simple, reliable, economical, and environmentally friendly, which provides a potential utilization prospect for large-scale industrial applications of biomass-based carbon material catalysts. Biomass-based lignin residues can not only reduce the high oxidation state of nickel ions into nickel nanoparticles by the in-situ reducing gas generated during the calcination process, but the mesoporous structure of lignin residue also promotes the adsorption of nickel metal, which greatly improved the catalytic activity of biomass-based Ni-based catalysts. The simple synthetic green, cost-effective and sustainable biomass-based Ni-based catalyst shows good performance in the selective hydrogenation of phenylacetylene, reaching 97.2% conversion and 84.3% styrene selectivity, respectively.

One-step synthesis of wire-in-plate nanostructured materials made of CoFe-LDH nanoplates coupled with Co(OH)2 nanowires grown on a Ni foam for a high-efficiency oxygen evolution reaction

2019 ◽  
Vol 55 (29) ◽  
pp. 4218-4221 ◽  
Author(s):  
Lingxi Zhou ◽  
Meichen Guo ◽  
Yao Li ◽  
Qin Gu ◽  
Wenqian Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Evolution ◽  
Nanostructured Materials ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
High Catalytic Activity ◽  
Ni Foam ◽  
One Step

A series of wire-in-plate nanostructured electrocatalysts for OER with high catalytic activity were fabricated.

High Efficiency Nitrogen Doping and Single Atom Cobalt Anchoring via Supermolecules for Oxygen Reduction Electrocatalysis

2021 ◽  
Author(s):  
Libo Deng ◽  
Xiujuan Li ◽  
Yuanyuan Chen ◽  
Weijie Liao ◽  
Lei Qiu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Nitrogen Doping ◽  
High Efficiency ◽  
Carbon Support ◽  
Utilization Efficiency ◽  
Single Atom ◽  
High Catalytic Activity

Single atom catalysts (SACs) stabilized by nitrogen in a carbon support and having maximized atom utilization efficiency and an unsaturated environment exhibit high catalytic activity and selectivity. Incorporating nitrogen into...

scholarly journals Preparation and in vivo characterization of a cocaine hydrolase engineered from human butyrylcholinesterase for metabolizing cocaine

2013 ◽  
Vol 453 (3) ◽  
pp. 447-454 ◽  
Author(s):  
Liu Xue ◽  
Shurong Hou ◽  
Min Tong ◽  
Lei Fang ◽  
Xiabin Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Cell Line ◽  
High Efficiency ◽  
Lethal Dose ◽  
Stable Cell Line ◽  
High Catalytic Activity ◽  
Abuse Treatment ◽  
Cocaine Toxicity ◽  
In Vivo Characterization

Cocaine is a widely abused drug without an FDA (Food and Drug Administration)-approved medication. It has been recognized that an ideal anti-cocaine medication would accelerate cocaine metabolism producing biologically inactive metabolites via a route similar to the primary cocaine-metabolizing pathway, i.e. human BChE (butyrylcholinesterase)-catalysed hydrolysis. However, the native human BChE has a low catalytic activity against cocaine. We recently designed and discovered a BChE mutant (A199S/F227A/S287G/A328W/Y332G) with a high catalytic activity (kcat=5700 min−1, Km=3.1 μM) specifically for cocaine, and the mutant was proven effective in protecting mice from acute cocaine toxicity of a lethal dose of cocaine (180 mg/kg of body weight, LD100). Further characterization in animal models requires establishment of a high-efficiency stable cell line for the BChE mutant production at a relatively larger scale. It has been extremely challenging to develop a high-efficiency stable cell line expressing BChE or its mutant. In the present study, we successfully developed a stable cell line efficiently expressing the BChE mutant by using a lentivirus-based repeated-transduction method. The scaled-up protein production enabled us to determine for the first time the in vivo catalytic activity and the biological half-life of this high-activity mutant of human BChE in accelerating cocaine clearance. In particular, it has been demonstrated that the BChE mutant (administered to mice 1 min prior to cocaine) can quickly metabolize cocaine and completely eliminate cocaine-induced hyperactivity in rodents, implying that the BChE mutant may be developed as a promising therapeutic agent for cocaine abuse treatment.

High-efficiency photo-oxidation of thioethers over C60@PCN-222 under air

2019 ◽  
Vol 7 (38) ◽  
pp. 22084-22091 ◽  
Author(s):  
Deng-Yue Zheng ◽  
En-Xuan Chen ◽  
Chun-Rong Ye ◽  
Xiao-Chun Huang
Keyword(s):  
Catalytic Activity ◽  
Photocatalytic Oxidation ◽  
High Efficiency ◽  
Photogenerated Electron ◽  
High Catalytic Activity ◽  
Electron Hole ◽  
Photo Oxidation ◽  
First Time

For the first time, fullerene (C60) was used to enhance the photogenerated electron–hole separation of MOFs as a catalyst and showed high catalytic activity in the photocatalytic oxidation of thioether in air.

H4,4,4-graphyne with double Dirac points as high-efficiency bifunctional electrocatalysts for water splitting

2021 ◽  
Author(s):  
Haona Zhang ◽  
Wei Wei ◽  
Shuhua Wang ◽  
Hao Wang ◽  
Baibiao Huang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Water Splitting ◽  
High Efficiency ◽  
Low Cost ◽  
Single Atom ◽  
High Catalytic Activity ◽  
Bifunctional Electrocatalysts

In the light of the ultrahigh atom utilization, high catalytic activity and low cost, single-atom catalysts (SACs) have been garnering extensive attention in the field of electrochemistry. In recent studies,...

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

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