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Nano Catalyst

Thomas J N Hooper, Thomas A Partridge, Gregory J Rees, Dean S Keeble, Nigel A Powell, Mark E Smith, Iryna P Mikheenko, Lynne E Macaskie, Peter T Bishop, John V Hanna
The ability to clearly relate local structure to function is desirable for many catalytically relevant Pd-containing systems. This report represents the first direct 105Pd solid state NMR measurements of diamagnetic inorganic (K2Pd(iv)Cl6, (NH4)2Pd(iv)Cl6 and K2Pd(iv)Br6) complexes, and micron- and nano-sized Pd metal particles at room temperature, thereby introducing effective 105Pd chemical shift and Knight shift ranges in the solid state. The very large 105Pd quadrupole moment (Q) makes the quadrupole parameters (CQ, ηQ) extremely sensitive to small structural distortions...
October 16, 2018: Physical Chemistry Chemical Physics: PCCP
James Aluha, Stéphane Gutierrez, François Gitzhofer, Nicolas Abatzoglou
A study was done on the effect of temperature and catalyst pre-treatment on CO hydrogenation over plasma-synthesized catalysts during the Fischer⁻Tropsch synthesis (FTS). Nanometric Co/C, Fe/C, and 50%Co-50%Fe/C catalysts with BET specific surface area of ~80 m² g⁻1 were tested at a 2 MPa pressure and a gas hourly space velocity (GHSV) of 2000 cm³ h-1 g-1 of a catalyst (at STP) in hydrogen-rich FTS feed gas (H₂:CO = 2.2). After pre-treatment in both H₂ and CO, transmission electron microscopy (TEM) showed that the used catalysts shifted from a mono-modal particle-size distribution (mean ~11 nm) to a multi-modal distribution with a substantial increase in the smaller nanoparticles (~5 nm), which was statistically significant...
October 12, 2018: Nanomaterials
G Cerrato, C L Bianchi, F Galli, C Pirola, S Morandi, V Capucci
The ingredients of Pharmaceuticals and Personal Care Products (PPCPs) persist in water and conventional treatment plants are not able to remove them efficiently. Sonochemical treatment is insufficient to mineralize organics such as ibuprofen into CO2 and H2 O. TiO2 degrades ibuprofen (IBP) under UV light; however, it does not reach a high grade of conversion. Here, we investigated the mineralization of ibuprofen to CO2 by TiO2 UV-C photocatalysis. We replaced nano-sized P25 (the standard catalyst) with a micro-sized commercial sample of TiO2 to preclude the use of nanoparticles which are dangerous for human health and because typical filtration systems are expensive and inefficient...
September 25, 2018: Journal of Hazardous Materials
Sara Azad, Bi Bi Fatemeh Mirjalili
The present study describes an efficient and environmentally benign protocol for the synthesis of 2,3-dihydro-2-substituted-1H-naphtho[1,2-e][1,3]oxazine derivatives. Synthesis is done by one-pot three-component condensation of 2-naphthol, formaldehyde, and primary amines in the presence of Fe3 O4 @nano-cellulose/TiCl as a bio-based magnetic nano-catalyst under solvent-free conditions at room temperature grinding. This green procedure offers the advantages of high yield, short reaction time, environmental friendliness, easy workup, simple magnetic recovery of the catalyst and its reusability up to ten times without significant loss of catalytic activity...
October 12, 2018: Molecular Diversity
Kourosh Abdollahi, Farshad Yazdani, Reza Panahi, Babak Mokhtarani
Low conversion efficiency and long-processing time are some of the major problems associated with the use of biocatalysts in industrial processes. In this study, modified magnetic iron oxide nanoparticles bearing tyrosinase (tyrosinase-MNPs) were employed as a magnetic nano-biocatalyst to treat phenol-containing wastewater. Different factors affecting the phenol removal efficiency of the fabricated nano-biocatalyst such as catalyst dosage, pH, temperature, initial phenol concentration, and reusability were investigated...
October 2018: 3 Biotech
Xiaoxu Liu, Yanhui Wang, Libei Chen, Peipei Chen, Shaopei Jia, Yan Zhang, Shuyu Zhou, Jianbing Zang
A novel hybrid electrocatalyst of Co2B and Co nanoparticles immobilized on N-B-doped carbon derived from nano-B4C (Co2B/Co/N-B-C/B4C) is in situ synthesized by pyrolysis of nano-B4C supporting Co(OH)2 nanoparticals with melamine. The Co2B and Co nanoparticles are formed and anchored on the generated N and B codoped carbon and undecomposed B4C. The hybrid exhibits remarkable catalytic performances towards oxygen evolution reaction and oxygen reduction reaction - a very small potential of 1.53 V at 10 mA cm-2 for oxygen evolution reaction and a high catalytic kinetics and superior durability for oxygen reduction reaction - which are superior to the RuO2 and Pt/C catalyst, respectively...
October 10, 2018: ACS Applied Materials & Interfaces
Xiaolin Guo, Zhihuan Qiu, Jianxin Mao, Renxian Zhou
A series of CuO/CeM(rod) catalysts doped by transition metals were prepared and systematically characterized. The introduction of Mn and Ti plays a significant role in promoting the catalytic performance of the CuO/CeO2(rod) catalyst for the preferential oxidation of CO in H2-rich gas, while the doping with Zr basically maintains the same catalytic activity and Ni leads to a negative influence. Mn and Ti additives remarkably enrich the formation of defect structures and promote copper ion incorporation into the surface of CeM(rod), which greatly facilitates the generation of strong interfacial copper-ceria interaction in CuO/CeMn(rod) and CuO/CeTi(rod)...
October 9, 2018: Physical Chemistry Chemical Physics: PCCP
Serena Rigo, Gesine Gunkel-Grabole, Wolfgang P Meier, Cornelia G Palivan
Co-immobilization of functional, nano-sized assemblies broadens the possibility to engineer dually functionalized active surfaces with nanostructured texture. Surfaces decorated with different nano-assemblies, such as micelles, polymersomes or nanoparticles are in high demand for various applications ranging from catalysis, biosensing up to antimicrobial surfaces. Here, we present a combination of bio-orthogonal and catalyst free strain promoted Azide-Alkyne click (SPAAC) and the thiol-ene reactions to simultaneously co-immobilize various nano-assemblies; we selected polymersome - polymersome and polymersome - micelle assemblies...
October 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Shijian Zhou, Weiming Jin, Yun Ding, Bo Shao, Bangbang Wang, Xu Hu, Yan Kong
Nowadays, agglomeration and leaching of metal active sites during reaction and recycle processes are considered to be a thorny problem for noble metal-based catalysts. Therefore, to make improvements, nano-gold was selected as a representative research object for many noble metals. In this study, Au nanoparticles (NPs) and magnetic γ-Fe2O3 were intercalated in situ in the walls of MCM-41 via a one-pot hydrothermal method, in which the intercalation process was preceded by co-condensation of tetraethyl orthosilicate (TEOS) with MPTS-Au complexes ((3-mercaptopropyl)-trimethoxysilane (MPTS), HAuCl4·3H2O), and a Fe3O4 sol...
October 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Rhys W Lodge, Graham A Rance, Michael W Fay, Andrei N Khlobystov
The evolution of individual palladium nanoparticle (PdNP) catalysts in graphitised nanofibres (GNF) in the liquid-phase Suzuki-Miyaura (SM) reaction has been appraised. The combination of identical location-transmission electron microscopy (IL-TEM) and a nano test tube approach allowed spatiotemporally continuous observations at the single nanoparticle level, revealing that migration and coalescence is the most significant pathway to coarsening of the nanocatalyst, rather than Ostwald ripening. IL-TEM gave unprecedented levels of detail regarding the movement of PdNP on carbon surfaces at the nanoscale, including size-dependent migration and directional movement, opening horizons for the optimisation of future catalysts through surface morphology design...
October 3, 2018: Nanoscale
Muhammad Adeel, Muhammad Bilal, Tahir Rasheed, Ashutosh Sharma, Hafiz M N Iqbal
Graphene-based nanomaterials have gained high research interest in different fields related to proteins and thus are rapidly becoming the most widely investigated carbon-based materials. Their exceptional physiochemical properties such as electrical, optical, thermal and mechanical strength enable graphene to render graphene-based nanostructured materials suitable for applications in different fields such as electroanalytical chemistry, electrochemical sensors and immobilization of biomolecules and enzymes...
September 24, 2018: International Journal of Biological Macromolecules
Rafael Müeller, Ilya Kuznetsov, Yunieski Arbelo, Matthias Trottmann, Carmen S Menoni, Jorge J Rocca, Greta R Patzke, Davide Bleiner
No abstract text is available yet for this article.
September 27, 2018: Analytical Chemistry
Yanan Wei, Bingfeng Wang, Xinfang Cui, Yaseen Muhammad, Yanjuan Zhang, Zuqiang Huang, Xuesheng Li, Zhenxia Zhao, Zhongxing Zhao
MIL(Fe)/Fe-SPC composite was fabricated from MIL-100(Fe) via in-situ growth on a unique Fe-doped nano-spongy porous biocarbon (Fe-SPC) and was used as Fenton-like catalyst for advanced degradation of thiamethoxam (THIA). Fe was loaded on a silkworm excrement and calcined to Fe-SPC with nano-spongy and high sp2 C structure. The in-situ growth strategy embedded the Fe-SPC into MIL-100(Fe) crystals and formed conductive heterojunctions with intensified interface by Fe-bridging effect which was confirmed by negative shift of Fe3+ binding energy in XPS...
September 27, 2018: ACS Applied Materials & Interfaces
Robina Begum, Zahoor H Farooqi, Zonarah Butt, Qingshi Wu, Weitai Wu, Ahmad Irfan
Silver nanoparticles with average diameter of 10±3nm were synthesized within the sieves of poly(N-isopropylacrylamide-2-hydroxyethylmethacrylate-acrylic acid) (p(NIPAAm-HEMA-AAc)) polymer microgels. Free radial emulsion polymerization was employed for synthesis of p(NIPAAm-HEMA-AAc) polymer microgels. Silver nanoparticles were introduced within the microgels sphere by in situ reduction method. Microgels and hybrid microgels were characterized by Fourier transform infrared spectroscopy, ultra violet-visible spectroscopy, transmission electron microscopy and dynamic light scattering measurements...
October 2018: Journal of Environmental Sciences (China)
Yi Zhao, Bo Yuan, Zehui Zheng, Runlong Hao
A nano-sized iron loaded ZSM-5 zeolite (Fe/ZSM-5) catalyst was firstly used to activate (NH4 )2 S2 O8 solution for the simultaneous removal of multi-pollutant from flue gas. The simultaneous removal efficiencies 100% of SO2 , 72.6% of NO and 93.4% of Hg° were achieved under the condition that the catalyst dose was 0.8 g/L, concentration, pH and temperature of (NH4 )2 S2 O8 solution were 0.03 mol/L, 5 and 65 °C, respectively. The stability of catalyst was checked by a continuous test, proving that the catalytic activity was maintained for 4 h and the leached iron reached low levels...
January 15, 2019: Journal of Hazardous Materials
Xingxu Lu, Son Hoang, Wenxiang Tang, Shoucheng Du, Sibo Wang, Fangyuan Liu, Wei Zhong, Steven L Suib, Gaoqiang Yang, Feng-Yuan Zhang, Pu-Xian Gao
Layered protonated titanates (LPTs) are promising support materials for catalytic applications because their high surface area and cation exchange capacity provide the possibility of achieving a high metal dispersion. However, the reported LPT nanomaterials are mainly limited to free-standing nanoparticles (NPs) and usually require high temperature and pressure conditions with extended reaction time. In this work, a high-throughput microwave-assisted hydrothermal method was developed for the direct synthesis of conformal LPT nanoarray coatings onto the three-dimensional honeycomb monoliths as well as other substrate surfaces at low temperature (75-95 °C) and pressure (1 atm)...
October 4, 2018: ACS Applied Materials & Interfaces
Zahra Rahmatinia, Massuomeh Rahmatinia
Among drugs, antibiotics have a significant place due to their wide consumption in veterinary and human medicine to prevent and treat microbial infections. In spite of low amounts of antibiotics in the aquatic environments, the repeated incidence of antibiotics has been caused bacterial persistence and adverse effects on health human and aquatic life. Current article evaluated the removal of metronidazole (MNZ) via heterogeneous electro-Fenton (EF) process by nano-Fe3 O4 . The response surface methodology (RSM) on Box-Behnken design was applied for modeling and optimization experimental factors such as pH, applied current, and catalyst load...
August 2018: Data in Brief
Lijun Luo, Lihong Xia, Wei Tan, Junhong Li, Colin J Barrow, Wenrong Yang, Hongbin Wang, Li Shu
In this work, TiO2 (B) nano-belts were synthesized by hydrothermal method under stirring, and static conditions and preparation conditions were optimized. The prepared materials were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), photoluminescence spectroscopy (PL), and N2 adsorption/desorption measurement. The photocatalytic performance was evaluated by removing synthetic estrogen 17α-ethynylestradiol (EE2), which is the most potent endocrine-disrupting chemical...
September 17, 2018: Environmental Science and Pollution Research International
William Foster, Juan A Aguilar, Halim Kusumaatmaja, Kislon Voϊtchovsky
Methanol occupies a central role in chemical synthesis and is considered an ideal candidate for cleaner fuel storage and transportation. It can be catalyzed from water and volatile organic compounds, such as carbon dioxide, thereby offering an attractive solution for reducing carbon emissions. However, molecular-level experimental observations of the catalytic process are scarce, and most existing catalysts tend to rely on empirically optimized, expensive, and complex nanocomposite materials. This lack of molecular-level insights has precluded the development of simpler, more cost-effective alternatives...
October 10, 2018: ACS Applied Materials & Interfaces
Yanqiu Peng, Ying Wang, Xing Wei, Jinping Zhou, Hanqing Peng, Li Xiao, Juntao Lu, Lin Zhuang
Alkaline polymer electrolyte fuel cells (APEFCs) are a new class of electrochemical devices that intrinsically enable the use of nonprecious metal catalysts. As an important component of APEFCs, alkaline polymer electrolytes (APEs) have been a research focus in recent decades. To minimize the ohmic loss and to facilitate the water transport, the APE membrane should be as thin as possible, which generally requires a trade-off between the ionic conductivity and the mechanical robustness/dimensional stability of the membrane...
October 3, 2018: ACS Applied Materials & Interfaces
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