Catalytic activity of CuGHK peptide-based porous material

2021 ◽  
Author(s):  
Francisco G. Cirujano ◽  
Nuria Martin ◽  
Neyvis Almora-Barrios ◽  
Carlos Martí-Gastaldo
Keyword(s):  
Catalytic Activity ◽  
Porous Material ◽  
Active Sites ◽  
Room Temperature ◽  
Side Chain ◽  
Periodic Distribution ◽  
Lysine Side Chain ◽  
One Step

Room temperature one-step synthesis of the peptide-based porous material with a periodic distribution of pockets decorated with lysine side chain active sites behaves as a heterogeneous organocatalyst. The pockets are...

Rational design of porous binary Pt-based nanodendrites as efficient catalysts for direct glucose fuel cells over a wide pH range

2017 ◽  
Vol 7 (13) ◽  
pp. 2819-2827 ◽  
Author(s):  
Kamel Eid ◽  
Yahia H. Ahmad ◽  
Siham Y. AlQaradawi ◽  
Nageh K. Allam
Keyword(s):  
Catalytic Activity ◽  
Oxidation Reaction ◽  
Rational Design ◽  
Glucose Oxidation ◽  
Room Temperature ◽  
Ph Values ◽  
Wide Ph Range ◽  
One Step ◽  
Ph Range ◽  
Glucose Oxidation Reaction

Porous binary PtPd, AuPt, PtCu, and PtNi nanodendrites prepared by a facile one-step reduction under ultrasonic irradiation at room temperature, exhibited a substantial catalytic activity towards glucose oxidation reaction at different pH values relative to a commercial Pt/C catalyst.

scholarly journals Hierarchical branched α-MnO2: one-step synthesis and catalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (74) ◽  
pp. 46529-46535 ◽  
Author(s):  
Hengfa Liu ◽  
Bentian Zhang ◽  
Wanping Li ◽  
Gao Cheng ◽  
Jiaxi Han ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dimethyl Ether ◽  
Catalytic Combustion ◽  
Room Temperature ◽  
Pine Tree ◽  
One Step

The hierarchical pine tree-like α-MnO2are controlled synthesized at room temperature without any template. The α-MnO2displays superior activity in the catalytic combustion of dimethyl ether.

One-step solvothermal synthesis of Al-promoted Fe3O4 magnetic catalysts for the selective oxidation of benzyl alcohol to benzaldehyde with H2O2 in water

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 101048-101060 ◽  
Author(s):  
Leisha Xiong ◽  
Rong Chen ◽  
Fengxi Chen
Keyword(s):  
Catalytic Activity ◽  
Synergistic Effect ◽  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Solvothermal Synthesis ◽  
Active Sites ◽  
Title Reaction ◽  
Oxidation Of Benzyl Alcohol ◽  
One Step

The in situ modification of Fe3O4 by aluminium introduced new active sites besides the primary iron sites. Their synergistic effect contributes to much better catalytic activity of Al-promoted Fe3O4 in the title reaction.

Two-dimensional N-doped Pd/carbon for highly efficient heterogeneous catalysis

2022 ◽  
Author(s):  
Jiuxuan Zhang ◽  
Ze-Xian Low ◽  
Yanhua Shao ◽  
Hong Jiang ◽  
Rizhi Chen
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysis ◽  
Porous Structure ◽  
Active Sites ◽  
Low Density ◽  
Two Dimensional ◽  
Highly Efficient ◽  
Low Dimension ◽  
One Step

A novel two-dimensional ZIF-derived Pd@CN prepared via one-step calcination exhibits outstanding catalytic activity in heterogeneous catalysis. The well-developed porous structure, low dimension and low density make active sites more accessible....

Enhanced Catalytic Activity of PdNi Dilute Nanoalloy for Selective Phenylacetylene Hydrogenation

2021 ◽  
Vol 16 (3) ◽  
pp. 380-386
Author(s):  
Yue Zhang ◽  
Changjin XU ◽  
Yutong Wu ◽  
Song Li
Keyword(s):  
Electronic Structure ◽  
Catalytic Activity ◽  
Active Sites ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Hydrogenation Catalysts ◽  
Dilute Alloys ◽  
Highly Active ◽  
Full Conversion ◽  
Dilute Alloy

Coordination of identical metals has significant impact on catalytic activity and selectivity of heterogeneous catalyst. Here, we show that the selectivity for hydrogenation of Pd can be manipulated by altering the coordinate environment. PdNi/SiO2 dilute alloy nanocatalysts have been synthesized at room temperature, which show effectively the unparalleled catalytic performance (about 100% selectivity to styrene) for phenylacetylene hydrogenation at 30 °C with full conversion. Structural and surface analyses show that the improvement in dispersion of the Pd active sites and the changed electronic structure of Pd contribute the catalytic performance significantly. This work is an important step towards developing highly active hydrogenation catalysts by forming dilute alloys.

scholarly journals Insights into the Morphological Effect of Co3O4 Crystallite on Catalytic Oxidation of Vinyl Chloride

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 408 ◽  
Author(s):  
Chao Wang ◽  
Wenchao Hua ◽  
Guangtao Chai ◽  
Chuanhui Zhang ◽  
Yanglong Guo
Keyword(s):  
Catalytic Activity ◽  
Vinyl Chloride ◽  
Material Characterization ◽  
Active Sites ◽  
Morphological Effect ◽  
Catalytic Activities ◽  
Adsorbed Oxygen Species ◽  
One Step ◽  
Crystallographic Structures ◽  
And Performance

Co3O4 catalysts of cube and sphere shapes were prepared by one-step hydrothermal synthesis with different controlled amounts of Co(NO3)2·6H2O and NaOH. The morphological effects on both physicochemical properties and catalytic activities of vinyl chloride oxidation were investigated by material characterization and performance evaluation. The obtained results showed that the morphology, resulting in the exposure difference of crystal planes, significantly affected the catalytic property. The catalytic activity for vinyl chloride oxidation followed a descending order of Co3O4 cube (Co3O4-c) > Co3O4 sphere (Co3O4-s) > Co3O4 commercial (Co3O4-com). The cube-shaped Co3O4 presented higher catalytic activity and stability than Co3O4 spheres despite their similar crystallographic structures as well as physicochemical and redox properties. Accordingly, the different catalytic behaviors should be attributed to a morphological effect. The Co3O4 cube with a preferential exposure of (001) plane presented higher abundance of surface Co2+ cations and adsorbed oxygen species, which acted as the active sites responsible for the improvement of its catalytic activity.

scholarly journals A Fluidics-Based Biosensor to Detect and Characterize Inhibition Patterns of Organophosphate to Acetylcholinesterase in Food Materials

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 397
Author(s):  
Dang Song Pham ◽  
Xuan Anh Nguyen ◽  
Paul Marsh ◽  
Sung Sik Chu ◽  
Michael P. H. Lau ◽  
...  
Keyword(s):  
Room Temperature ◽  
Current Flow ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Food Samples ◽  
Side Chain ◽  
Limit Of Quantification ◽  
Activity Inhibition ◽  
Lysine Side Chain ◽  
Sensing Platform

A chip-based electrochemical biosensor is developed herein for the detection of organophosphate (OP) in food materials. The principle of the sensing platform is based on the inhibition of dimethoate (DMT), a typical OP that specifically inhibits acetylcholinesterase (AChE) activity. Carbon nanotube-modified gold electrodes functionalized with polydiallyldimethylammonium chloride (PDDA) and oxidized nanocellulose (NC) were investigated for the sensing of OP, yielding high sensitivity. Compared with noncovalent adsorption and deposition in bovine serum albumin, bioconjugation with lysine side chain activation allowed the enzyme to be stable over three weeks at room temperature. The total amount of AChE was quantified, whose activity inhibition was highly linear with respect to DMT concentration. Increased incubation times and/or DMT concentration decreased current flow. The composite electrode showed a sensitivity 4.8-times higher than that of the bare gold electrode. The biosensor was challenged with organophosphate-spiked food samples and showed a limit of detection (LOD) of DMT at 4.1 nM, with a limit of quantification (LOQ) at 12.6 nM, in the linear range of 10 nM to 1000 nM. Such performance infers significant potential for the use of this system in the detection of organophosphates in real samples.

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

A Study on the Rearrangement of Dialkyl 1-Aryl-1-hydroxymethylphosphonates to Benzyl Phosphates

2020 ◽  
Vol 24 (4) ◽  
pp. 465-471 ◽  
Author(s):  
Zita Rádai ◽  
Réka Szabó ◽  
Áron Szigetvári ◽  
Nóra Zsuzsa Kiss ◽  
Zoltán Mucsi ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Room Temperature ◽  
Phase Transfer ◽  
One Pot ◽  
Substrate Dependence ◽  
Triethylbenzylammonium Chloride ◽  
One Step ◽  
The Pudovik Reaction ◽  
The One ◽  
Solid Liquid

The phospha-Brook rearrangement of dialkyl 1-aryl-1-hydroxymethylphosphonates (HPs) to the corresponding benzyl phosphates (BPs) has been elaborated under solid-liquid phase transfer catalytic conditions. The best procedure involved the use of triethylbenzylammonium chloride as the catalyst and Cs2CO3 as the base in acetonitrile as the solvent at room temperature. The substrate dependence of the rearrangement has been studied, and the mechanism of the transformation under discussion was explored by quantum chemical calculations. The key intermediate is an oxaphosphirane. The one-pot version starting with the Pudovik reaction has also been developed. The conditions of this tandem transformation were the same, as those for the one-step HP→BP conversion.

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

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