Preparation and Application of a Hydrochar-Based Palladium Nanocatalyst for the Reduction of Nitroarenes

In the present study, a novel heterogeneous catalyst was successfully fabricated through the decoration of palladium nanoparticles on the surface of designed Fe3O4-coffee waste composite (Pd-Fe3O4-CWH) for the catalytic reduction of nitroarenes. Various characterization techniques such as XRD, FE-SEM and EDS were used to establish its nano-sized chemical structure. It was determined that Pd-Fe3O4-CWH is a useful nanocatalyst, which can efficiently reduce various nitroarenes, including 4-nitrobenzoic acid (4-NBA), 4-nitroaniline (4-NA), 4-nitro-o-phenylenediamine (4-NPD), 2-nitroaniline (2-NA) and 3-nitroanisole (3-NAS), using NaBH4 in aqueous media and ambient conditions. Catalytic reactions were monitored with the help of high-performance liquid chromatography. Additionally, Pd-Fe3O4-CWH was proved to be a reusable catalyst by maintaining its catalytic activity through six successive runs. Moreover, the nanocatalyst displayed a superior catalytic performance compared to other catalysts by providing a shorter reaction time to complete the reduction in nitroarenes.

Download Full-text

Copper Nanoparticles Deposited Cellulose Acetate Microfibers as Heterogenous Catalysts for 4-Nitrophenol Reduction in Aqueous Media

Nanoscience and Nanotechnology Letters ◽

10.1166/nnl.2019.2936 ◽

2019 ◽

Vol 11 (5) ◽

pp. 630-637

Author(s):

Peng Xu ◽

Changli Cen ◽

Nannan Chen ◽

Mengke Zheng ◽

Zhenguo Wu ◽

...

Keyword(s):

Cellulose Acetate ◽

Copper Nanoparticles ◽

Photoelectron Spectroscopy ◽

Copper Chloride ◽

Aqueous Media ◽

Reduction Process ◽

Catalytic Performance ◽

Reusable Catalyst ◽

X Ray ◽

Nitrophenol Reduction

In this work, copper nanoparticles (CuNPs) loaded cellulose acetate microfibers (CAMFs-Cu) are successfully prepared as a novel heterogenous catalyst. For this purpose, the cellulose acetate microfibers (CAMFs) with a diameter of ca. 300–500 nm are fabricated by electrospinning method. Then, CuNPs are deposited onto the CAMFs via a convenient wet reduction process using copper chloride as precursor and sodium borohydride as reduction agent. The chemical composition of the fabricated CAMFs-Cu is characterized by energy dispersive X-ray (EDX) spectroscopy, powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Scanning electron microscope (SEM) and transmission electron microscopy (TEM) images reveal that the CuNPs with a diameter of approximately 20 nm are homogenously deposited on the CAMFs. The distribution density for the CuNPs increases with precursor concentrations. The catalytic performance shows that the CAMFsCu lead to approximate 100% reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) and the reaction constant increases with deposited Cu content. The CAMFs-Cu heterogenous catalysts are very stable and could be reused up to eight times in consecutive runs without any treatment between the cycles. The CAMFs-Cu is thus expected to have great potential as a highly efficient, cost-effective and eco-friendly reusable catalyst for catalytic applications.

Download Full-text

Catalytic Performance of Imidazolide Basic Ionic Liquid in Knoevenagel Reactions in Aqueous Media

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION) ◽

10.3724/sp.j.1088.2011.01238 ◽

2011 ◽

Vol 32 (4) ◽

pp. 693-698

Author(s):

Xuewei CHEN ◽

Hongbing SONG ◽

Xuehui LI ◽

Furong WANG ◽

Yu QIAN

Keyword(s):

Ionic Liquid ◽

Aqueous Media ◽

Catalytic Performance ◽

Basic Ionic Liquid

Download Full-text

Crystal Engineering Approach for Fabrication of Inverted Perovskite Solar Cell in Ambient Conditions

Energies ◽

10.3390/en14061751 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1751

Author(s):

Inga Ermanova ◽

Narges Yaghoobi Nia ◽

Enrico Lamanna ◽

Elisabetta Di Bartolomeo ◽

Evgeny Kolesnikov ◽

...

Keyword(s):

Solar Cell ◽

Crystal Engineering ◽

High Performance ◽

Perovskite Solar Cells ◽

Perovskite Solar Cell ◽

Layer By Layer ◽

Ambient Conditions ◽

Sequential Method ◽

Engineering Approach ◽

Hole Transporting

In this paper, we demonstrate the high potentialities of pristine single-cation and mixed cation/anion perovskite solar cells (PSC) fabricated by sequential method deposition in p-i-n planar architecture (ITO/NiOX/Perovskite/PCBM/BCP/Ag) in ambient conditions. We applied the crystal engineering approach for perovskite deposition to control the quality and crystallinity of the light-harvesting film. The formation of a full converted and uniform perovskite absorber layer from poriferous pre-film on a planar hole transporting layer (HTL) is one of the crucial factors for the fabrication of high-performance PSCs. We show that the in-air sequential deposited MAPbI3-based PSCs on planar nickel oxide (NiOX) permitted to obtain a Power Conversion Efficiency (PCE) exceeding 14% while the (FA,MA,Cs)Pb(I,Br)3-based PSC achieved 15.6%. In this paper we also compared the influence of transporting layers on the cell performance by testing material depositions quantity and thickness (for hole transporting layer), and conditions of deposition processes (for electron transporting layer). Moreover, we optimized second step of perovskite deposition by varying the dipping time of substrates into the MA(I,Br) solution. We have shown that the layer by layer deposition of the NiOx is the key point to improve the efficiency for inverted perovskite solar cell out of glove-box using sequential deposition method, increasing the relative efficiency of +26% with respect to reference cells.

Download Full-text

High-Performance Single-Atom Ni Catalyst Loaded Graphyne for H2O2 Green Synthesis in Aqueous Media

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2021.04.080 ◽

2021 ◽

Author(s):

Wei Zhang ◽

Yi-jing Gao ◽

Qiao-Jun Fang ◽

Jin-kong Pan ◽

Xin-Cheng Zhu ◽

...

Keyword(s):

Green Synthesis ◽

High Performance ◽

Aqueous Media ◽

Single Atom ◽

Ni Catalyst

Download Full-text

Study of Ce, Sb, and Y exchanged titania nanotubes and superior catalytic performance for the selective catalytic reduction of NOx

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2021.119939 ◽

2021 ◽

Vol 287 ◽

pp. 119939

Author(s):

Devaiah Damma ◽

Dimitrios K. Pappas ◽

Thirupathi Boningari ◽

Panagiotis G. Smirniotis

Keyword(s):

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Catalytic Performance ◽

Titania Nanotubes ◽

Reduction Of Nox

Download Full-text

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Catalysts ◽

10.3390/catal11010055 ◽

2021 ◽

Vol 11 (1) ◽

pp. 55

Author(s):

Katarzyna Świrk ◽

Ye Wang ◽

Changwei Hu ◽

Li Li ◽

Patrick Da Costa ◽

...

Keyword(s):

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Supported Catalysts ◽

Catalytic Performance ◽

Experimental Conditions ◽

One Pot ◽

Nh3 Scr ◽

Scr Of No ◽

Temperature Programmed ◽

Stationary Sources

Copper and iron promoted ZrO2 catalysts were prepared by one-pot synthesis using urea. The studied catalysts were characterized by XRD, N2 physisorption, XPS, temperature-programmed desorption of NH3 (NH3-TPD), and tested by the selective catalytic reduction by ammonia (NH3-SCR) of NO in the absence and presence of water vapor, under the experimental conditions representative of exhaust gases from stationary sources. The influence of SO2 on catalytic performance was also investigated. Among the studied catalysts, the Fe-Zr sample showed the most promising results in NH3-SCR, being active and highly selective to N2. The addition of SO2 markedly improved NO and NH3 conversions during NH3-SCR in the presence of H2O. The improvement in acidic surface properties is believed to be the cause.

Download Full-text

Catalytic production of impurity-free V3.5+ electrolyte for vanadium redox flow batteries

Nature Communications ◽

10.1038/s41467-019-12363-7 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 5

Author(s):

Jiyun Heo ◽

Jae-Yun Han ◽

Soohyun Kim ◽

Seongmin Yuk ◽

Chanyong Choi ◽

...

Keyword(s):

High Speed ◽

High Performance ◽

Large Scale ◽

Catalytic Reduction ◽

Continuous Production ◽

Vanadium Redox Flow Battery ◽

Manufacturing Cost ◽

Chemical Production ◽

High Manufacturing Cost ◽

Vanadium Redox

Abstract The vanadium redox flow battery is considered one of the most promising candidates for use in large-scale energy storage systems. However, its commercialization has been hindered due to the high manufacturing cost of the vanadium electrolyte, which is currently prepared using a costly electrolysis method with limited productivity. In this work, we present a simpler method for chemical production of impurity-free V3.5+ electrolyte by utilizing formic acid as a reducing agent and Pt/C as a catalyst. With the catalytic reduction of V4+ electrolyte, a high quality V3.5+ electrolyte was successfully produced and excellent cell performance was achieved. Based on the result, a prototype catalytic reactor employing Pt/C-decorated carbon felt was designed, and high-speed, continuous production of V3.5+ electrolyte in this manner was demonstrated with the reactor. This invention offers a simple but practical strategy to reduce the production cost of V3.5+ electrolyte while retaining quality that is adequate for high-performance operations.

Download Full-text

Direct Growth of Polyaniline Chains from Nitrogen Site of N-Doped Carbon Nanotubes for High Performance Supercapacitor

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.93.164 ◽

2014 ◽

Vol 93 ◽

pp. 164-167 ◽

Cited By ~ 1

Author(s):

Joon Won Lim ◽

Atta Ul Haq ◽

Sang Ouk Kim

Keyword(s):

Carbon Nanotubes ◽

High Performance ◽

Chemical Structure ◽

Carbon Materials ◽

Graphitic Carbon ◽

Polymer Grafting ◽

Aniline Monomer ◽

Defect Site ◽

Direct Growth ◽

Grafting From

Polymer grafting from graphitic carbon materials has been explored for several decades. Currently existing methods mostly employ harsh chemical treatment to generate defect site in graphitic carbon plane, which are used as active site for polymerization of precursors. Unfortunately, the treatment cause serious degradation of chemical structure and material properties. Here, we present a straightforward route for growth of polyaniline chain from nitrogen (N)-sites of carbon nanotubes. N site in the CNT wall initiates the polymerization of aniline monomer, which generates seamless hybrids composed of polyaniline directly grafted onto the CNT walls. The synthesized hybrids show excellent synergistic electrochemical performance, and are employed for electrodes of pseudo-capacitor. This approach offers an efficient way to obtain hybrid system consisting of conducting polymers directly grafted from graphitic dopant sites.

Download Full-text

Polyimide-Silica Hybrid Aerogels with High Mechanical Strength for Thermal Insulation Applications

MRS Proceedings ◽

10.1557/opl.2011.380 ◽

2011 ◽

Vol 1306 ◽

Cited By ~ 2

Author(s):

Wenting Dong ◽

Wendell Rhine ◽

Shannon White

Keyword(s):

Thermal Conductivity ◽

High Performance ◽

Ambient Conditions ◽

Separation Membranes ◽

Low Dielectric ◽

Aging Conditions ◽

Hybrid Aerogels ◽

Mechanical Strengths ◽

The Relationship ◽

Silica Hybrid

ABSTRACTHigh performance polyimides have been widely investigated as materials with excellent thermal, mechanical, and electronic properties due to their highly rigid structures. Aspen has developed an approach to prepare polyimide aerogels which have applications as low dielectric constant materials, separation membranes, catalyst supports and insulation materials. In this paper, we will discuss the preparation of polyimide-silica hybrid aerogel materials with good mechanical strengths and low thermal conductivities. The polyimide-silica hybrid aerogels were made by a two-step process and the materials were characterized to determine thermal conductivity and compressive strength. Results show that compressive moduli of the polyimide-silica hybrid aerogels increase dramatically with density (power law relationship). Thermal conductivity of the aerogels is dependent on the aging conditions and density, with the lowest value achieved so far being ~12 mW/m-K at ambient conditions. The relationship between aerogel density and surface area, thermal stability, porosity and morphology of the nanostructure of the polyimide-silica hybrid aerogels are also described in this paper.

Download Full-text