scholarly journals Electron Beam Induced Enhancement of the Catalytic Properties of Ion-Track Membranes Supported Copper Nanotubes in the Reaction of the P-Nitrophenol Reduction

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 737 ◽  
Author(s):  
Anastassiya A. Mashentseva ◽  
Dmitriy I. Shlimas ◽  
Artem L. Kozlovskiy ◽  
Maxim V. Zdorovets ◽  
Alyona V. Russakova ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dose Range ◽  
Composite Membranes ◽  
Reduction Reaction ◽  
Reaction Rate Constant ◽  
Force Microscopy ◽  
Composite Catalysts ◽  
Track Membranes ◽  
Nitrophenol Reduction ◽  
Copper Nanotubes

This study considers the effect of various doses of electron irradiation on the crystal structure and properties of composite catalysts based on polyethylene terephthalate track-etched membranes and copper nanotubes. Copper nanotubes were obtained by electroless template synthesis and irradiated with electrons with 3.8 MeV energy in the dose range of 100–250 kGy in increments of 50 kGy. The original and irradiated samples of composites were investigated by X-ray diffraction technique (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The improved catalytic activity of composite membranes with copper nanotubes was demonstrated by the example of the reduction reaction of p-nitrophenol in the presence of sodium borohydride. Irradiation with electrons at doses of 100 and 150 kGy led to reaction rate constant increases by 35 and 59%, respectively, compared to the non-irradiated sample. This enhancing catalytic activity could be attributed to the changing of the crystallite size of copper, as well as the surface roughness of the composite membrane.

scholarly journals Ruthenium Supported on Ionically Cross-linked Chitosan-Carrageenan Hybrid MnFe2O4 Catalysts for 4-Nitrophenol Reduction

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 254 ◽  
Author(s):  
Kin Hong Liew ◽  
Tian Khoon Lee ◽  
Mohd Ambar Yarmo ◽  
Kee Shyuan Loh ◽  
Andreia F. Peixoto ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Electrostatic Interactions ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Ru Nanoparticles ◽  
Nitrophenol Reduction ◽  
Active Metal ◽  
Wide Range ◽  
Mnfe2o4 Nanoparticles ◽  
Superparamagnetic Properties

Herein, we report a facile procedure to synthesize the hybrid magnetic catalyst (Ru@CS-CR@Mn) using ruthenium (Ru) supported on ionically cross-linked chitosan-carrageenan (CS-CR) and manganese ferrite (MnFe2O4) nanoparticles with excellent catalytic activity. The ionic gelation of CS-CR is acting as a protecting layer to promote the encapsulation of MnFe2O4 and Ru nanoparticles by electrostatic interactions. The presence of an active metal and a CS-CR layer on the as-prepared Ru@CS-CR@Mn catalyst was well determined by a series of physicochemical analyses. Subsequently, the catalytic performances of the Ru@CS-CR@Mn catalysts were further examined in the 4-nitrophenol (4-NP) reduction reaction in the presence of sodium borohydride (reducing agent) at ambient temperature. The Ru@CS-CR@Mn catalyst performed excellent catalytic activity in the 4-NP reduction, with a turnover frequency (TOF) values of 925 h−1 and rate constant (k) of 0.078 s−1. It is worth to mentioning that the Ru@CS-CR@Mn catalyst can be recycled and reused up to at least ten consecutive cycles in the 4-NP reduction with consistency in catalytic performance. The Ru@CS-CR@Mn catalyst is particularly attractive as a catalyst due to its superior catalytic activity and superparamagnetic properties for easy separation. We foresee this catalyst having high potential to be extended in a wide range of chemistry applications.

Magnetic N-doped Co–carbon composites derived from metal organic frameworks as highly efficient catalysts for p-nitrophenol reduction reaction

2018 ◽  
Vol 47 (10) ◽  
pp. 3321-3328 ◽  
Author(s):  
Haoyang Zhao ◽  
Lang Zhao
Keyword(s):  
Catalytic Activity ◽  
Reaction Kinetics ◽  
Conversion Efficiency ◽  
Metal Organic Frameworks ◽  
Carbon Matrix ◽  
Reduction Reaction ◽  
Carbon Composites ◽  
Nitrophenol Reduction ◽  
Metal Organic ◽  
One Step

Magnetic nitrogenous cobalt–carbon composites were synthesized via one-step calcination of N-ZIF-67 as a strategy to introduce metal and N atoms into a conductive carbon matrix, and were applied as catalysts in the reduction of 4-NP by NaBH4. N-Co@C-800-3 exhibited much better catalytic activity, in terms of both conversion efficiency and reaction kinetics, compared to the others.

Facile and green synthesis of clean porous Pd/2D-material nanocomposites with improved catalytic properties in 4-nitrophenol reduction reaction - the first part

2020 ◽  
Vol 01 ◽  
Author(s):  
Kai Ke ◽  
Haiyang Liu ◽  
Xin Chen ◽  
Lingling Wang ◽  
Jiali Fang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Lower Cost ◽  
Cost Effective ◽  
Reduction Reaction ◽  
Environment Friendly ◽  
Design And Synthesis ◽  
Nitrophenol Reduction ◽  
Reduced Graphene ◽  
Catalytic Stability

Background: The development of environment-friendly and cost-effective palladium(Pd) based nanocomposite is of high interest for catalytic applications. Objective and Methods: In this paper, a porous Pd/two-dimensional-material (graphene oxide (GO) and reduced graphene oxide (rGO)) nanocomposite was synthesized with a green and facile method, without adding any additional reductant, surfactant and special solvent. Results: The catalytic activity of the Pd/rGO composite was investigated using the 4-nitrophenol (4-NP) reduction reaction in the presence of sodium borohydride (NaBH4). The results showed that the Pd/rGO nanocomposite not only exhibited much higher catalytic activity than the pure porous Pd catalyst, but also showed a very good catalytic stability, due to the less Pd aggregation and increased local 4-NP concentration arose from rGO bonding attraction. Besides, the Pd-rGO nanocomposite showed a kapp value of 0.383 min-1 , which was 13 times higher than the pure Pd (0.0292 min-1 ), as well as a reliable 4-NP conversion rate of over 97%. Conclusion: This study may provide a route for green-design and synthesis of heterogeneous catalyst composites with lower cost and better performance.

scholarly journals Facile Route Fabrication of Steam Exploded Poplar Loaded with Non-metal Doped Ni-Fe Nanoparticles: Catalytic Activities in 4-nitrophenol Reduction and Electrocatalytic Reaction

2021 ◽  
Author(s):  
Cheng Pan ◽  
Guangying Yang ◽  
Haitao Yang
Keyword(s):  
Catalytic Activity ◽  
Supported Catalysts ◽  
Raw Materials ◽  
Supported Catalyst ◽  
Reaction Rate Constant ◽  
Ambient Conditions ◽  
Activity Factor ◽  
Nitrophenol Reduction ◽  
Metal Doped ◽  
Electrocatalytic Reaction

Abstract A simple and effective method for the preparation of non-metallic ion-doped nickel-supported catalyst is reported. Using economical and recyclable fiber raw materials as carriers, nickel-supported catalysts are prepared by adsorption and reduction at room temperature. The nanoparticles dispersedly anchored on a rational support can efficiently inhibit the aggregation and thus enhance the catalytic activity. For the model catalytic hydrogenation of 4-NP by NaBH4, the N-B-Ni2P/SEP and N-B-NiFeP/SEP catalysts exhibited much better catalytic performances than other catalysts recently reported in terms of the catalytic activity (reaction completed within 5 min), reaction rate constant (1.617 and 0.765 min− 1) and the activity factor K (539 and 255 min− 1·g− 1), respectively. The catalyst showed activities for electrocatalytic HER and OER under ambient conditions. In general, the reported preparation method of nickel-supported catalyst is convenient, economical and environmentally friendly, which is in line with many green chemistry and sustainable development principles and widely available starting materials.

The catalytic evaluation of in situ grown Pd nanoparticles on the surface of Fe3O4@dextran particles in the p-nitrophenol reduction reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8289-8296 ◽  
Author(s):  
Luciano R. S. Lara ◽  
Alexandre D. Zottis ◽  
Welman C. Elias ◽  
Deonildo Faggion ◽  
Carlos Eduardo Maduro de Campos ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Sodium Borohydride ◽  
Pd Nanoparticles ◽  
Reduction Reaction ◽  
Natural Polymer ◽  
Activity Evaluation ◽  
Nitrophenol Reduction

We report the catalytic activity evaluation of in situ grown Pd nanoparticles on the surface of superparamagnetic Fe3O4 particles coated with the natural polymer dextran, in the reduction of p-nitrophenol (Nip), in water, by sodium borohydride.

Evaluation of the catalytic activity of the composite track-etched membranes for p-nitrophenol reduction reaction

2015 ◽  
Vol 55 (10) ◽  
pp. 810-815 ◽  
Author(s):  
A. A. Mashentseva ◽  
D. B. Borgekov ◽  
D. T. Niyazova ◽  
M. V. Zdorovets
Keyword(s):  
Catalytic Activity ◽  
Reduction Reaction ◽  
Nitrophenol Reduction

Ordered Intermetallic Nanoparticles with High Catalytic Activity Prepared by an Electrochemically Induced Phase Transformation

2019 ◽  
Author(s):  
Du Sun ◽  
yunfei wang ◽  
Kenneth Livi ◽  
chuhong wang ◽  
ruichun luo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffusion Mechanism ◽  
Reduction Reaction ◽  
Atomic Scale ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Magnetic Devices ◽  
Disordered Alloys ◽  
Ordered Intermetallic ◽  
Intermetallic Nanoparticles

<div> <p>The synthesis of alloys with long range atomic scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in materials development. We report a process for converting colloidally synthesized ordered intermetallic PdBi<sub>2</sub> to ordered intermetallic Pd<sub>3</sub>Bi nanoparticles under ambient conditions by an electrochemically induced phase transition. The low melting point of PdBi<sub>2</sub> corresponds to low vacancy formation energies which enables the facile removal of the Bi from the surface, while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd<sub>3</sub>Bi exhibits 11x and 3.5x higher mass activty and high methanol tolerance for the oxygen reduction reaction compared to Pt/C and Pd/C, respectively,which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble metal rich ordered intermetallic phases with high catalytic activity, and sets forth guidelines for the design of ordered intermetallic compounds under ambient conditions.</p> </div>

Facile Synthesis of Cu2O nanoparticle-loaded Carbon Nanotubes Composite Catalysts for Reduction of 4-Nitrophenol

2020 ◽  
Vol 16 (4) ◽  
pp. 617-624 ◽  
Author(s):  
Yao Feng ◽  
Ran Wang ◽  
Juanjuan Yin ◽  
Fangke Zhan ◽  
Kaiyue Chen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Stability ◽  
Catalytic Reduction ◽  
High Surface ◽  
High Surface Area ◽  
Reduction Reaction ◽  
Cycle Performance ◽  
Simple Method ◽  
Composite Catalysts ◽  
Cu2o Nanoparticles

Background: 4-nitrophenol (4-NP) is one of the pollutants in sewage and harmful to human health and the environment. Cu is a non-noble metal with catalytic reduction effect on nitro compounds, and.has the advantages of simple preparation, abundant reserves, and low price. Carbon nanotubes (CNT) are widely used for substrate due to their excellent mechanical stability and high surface area. In this study, a simple method to prepare CNT-Cu2O by controlling different reaction time was reported. The prepared nanocomposites were used to catalyze 4-NP. Methods: CNTs and CuCl2 solution were put into a beaker, and then ascorbic acid and NaOH were added while continuously stirring. The reaction was carried out for a sufficiently long period of time at 60°C. The prepared samples were dried in a vacuum at 50°C for 48 h after washing with ethyl alcohol and deionized water. Results: Nanostructures of these composites were characterized by scanning electron microscope and transmission electron microscopy techniques, and the results at a magnification of 200 nanometers showed that Cu2O was distributed on the surface of the CNTs. In addition, X-ray diffraction was performed to further confirm the formation of Cu2O nanoparticles. The results of ultraviolet spectrophotometry showed that the catalytic effect of the compound on 4-NP was obvious. Conclusions: CNTs acted as a huge template for loading Cu2O nanoparticles, which could improve the stability and cycle performance of Cu2O. The formation of nanoparticles was greatly affected by temperature and the appropriate concentration, showing great reducibility for the 4-NP reduction reaction.

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