keyword
MENU ▼
Read by QxMD icon Read
search

zeolite

keyword
https://www.readbyqxmd.com/read/27925296/metal-organic-framework-as-a-protective-coating-for-biodiagnostic-chips
#1
Congzhou Wang, Sirimuvva Tadepalli, Jingyi Luan, Keng-Ku Liu, Jeremiah J Morrissey, Evan D Kharasch, Rajesh R Naik, Srikanth Singamaneni
A zeolitic imidazolate framework-8 (ZIF-8) grown around antibodies anchored to plasmonic nanostructures serve as a protective layer to preserve the biorecognition ability of antibodies stored at room and elevated temperatures for several days. The biofunctionality of the ZIF-8 protected biochip can be restored by a simple water rinsing step, making it highly convenient for use in point-of-care and resource-limited settings.
December 7, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27924979/the-mechanism-of-selective-catalytic-reduction-of-nox-on-cu-ssz-13-a-computational-study
#2
Douglas W Crandell, Haiyang Zhu, Xiaofan Yang, John Hochmuth, Mu-Hyun Baik
The copper-exchanged aluminosilicate zeolite SSZ-13 is a leading catalyst for the selective catalytic reduction of NO. Density functional theory calculations are used to construct a complete catalytic cycle of this process paying special attention to the coordination geometries and redox states of copper. N2 can be produced in the reduction half-cycle via a nitrosamine intermediate generated from the reaction of the additive reductant NH3 with a NO(+) intermediate stabilized by the zeolite lattice. The decomposition of this nitrosamine species can be assisted by incipient Brønsted acid sites generated during catalysis...
December 7, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27924310/tunable-oleo-furan-surfactants-by-acylation-of-renewable-furans
#3
Dae Sung Park, Kristeen E Joseph, Maura Koehle, Christoph Krumm, Limin Ren, Jonathan N Damen, Meera H Shete, Han Seung Lee, Xiaobing Zuo, Byeongdu Lee, Wei Fan, Dionisios G Vlachos, Raul F Lobo, Michael Tsapatsis, Paul J Dauenhauer
An important advance in fluid surface control was the amphiphilic surfactant composed of coupled molecular structures (i.e., hydrophilic and hydrophobic) to reduce surface tension between two distinct fluid phases. However, implementation of simple surfactants has been hindered by the broad range of applications in water containing alkaline earth metals (i.e., hard water), which disrupt surfactant function and require extensive use of undesirable and expensive chelating additives. Here we show that sugar-derived furans can be linked with triglyceride-derived fatty acid chains via Friedel-Crafts acylation within single layer (SPP) zeolite catalysts...
November 23, 2016: ACS Central Science
https://www.readbyqxmd.com/read/27918418/insecticide-effect-of-zeolites-on-the-tomato-leafminer-tuta-absoluta-lepidoptera-gelechiidae
#4
Caroline De Smedt, Veerle Van Damme, Patrick De Clercq, Pieter Spanoghe
(1) Background: The tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae) is a key tomato insect pest. At present, it is considered to be a serious threat in various countries in Europe, North Africa, and Middle East. The extensive use and the developed resistance of T. absoluta to spinosad causes some concern, which leads to the need for alternative products. (2) Materials and Methods: Several laboratory experiments were conducted to investigate the ovicidal properties of a zeolite particle film on T. absoluta...
December 2, 2016: Insects
https://www.readbyqxmd.com/read/27914330/synergistic-effect-of-p-n-heterojunction-supporting-and-zeolite-nanoparticles-in-enhanced-photocatalytic-activity-of-nio-and-sno2
#5
Hadis Derikvandi, Alireza Nezamzadeh-Ejhieh
Increased photocatalytic activity of NiO and SnO2 was achieved by coupling and supporting of them onto clinoptilolite nanoparticles (NC) via calcination of Ni(II)-Sn(IV) - exchanged NC in photocatalytic degradation of metronidazole (MZ) aqueous solution. XRD, XRF, FTIR, SEM, X-ray mapping, DRS, TEM, BET Cyclic voltammetry and electrochemical impedance spectroscopy techniques (EIS) were used for characterization of samples. Red shift occurred in bang gap energies of the coupled semiconductors with respect to monocomponent one...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27911823/continuous-flow-synthesis-of-zsm-5-zeolite-on-the-order-of-seconds
#6
Zhendong Liu, Kotatsu Okabe, Chokkalingam Anand, Yasuo Yonezawa, Jie Zhu, Hiroki Yamada, Akira Endo, Yutaka Yanaba, Takeshi Yoshikawa, Koji Ohara, Tatsuya Okubo, Toru Wakihara
The hydrothermal synthesis of zeolites carried out in batch reactors takes a time so long (typically, on the order of days) that the crystallization of zeolites has long been believed to be very slow in nature. We herein present a synthetic process for ZSM-5, an industrially important zeolite, on the order of seconds in a continuous flow reactor using pressurized hot water as a heating medium. Direct mixing of a well-tuned precursor (90 °C) with the pressurized water preheated to extremely high temperature (370 °C) in the millimeter-sized continuous flow reactor resulted in immediate heating to high temperatures (240-300 °C); consequently, the crystallization of ZSM-5 in a seed-free system proceeded to completion within tens of or even several seconds...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911397/nanostructured-ag-zeolite-composites-as-luminescence-based-humidity-sensors
#7
Eduardo Coutino-Gonzalez, Wouter Baekelant, Bjorn Dieu, Maarten B J Roeffaers, Johan Hofkens
Small silver clusters confined inside zeolite matrices have recently emerged as a novel type of highly luminescent materials. Their emission has high external quantum efficiencies (EQE) and spans the whole visible spectrum. It has been recently reported that the UV excited luminescence of partially Li-exchanged sodium Linde type A zeolites [LTA(Na)] containing luminescent silver clusters can be controlled by adjusting the water content of the zeolite. These samples showed a dynamic change in their emission color from blue to green and yellow upon an increase of the hydration level of the zeolite, showing the great potential that these materials can have as luminescence-based humidity sensors at the macro and micro scale...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910770/addition-of-zeolites-to-improve-the-functional-characteristics-of-the-hen-of-the-wood-or-maitake-medicinal-mushroom-grifola-frondosa-agaricomycetes
#8
Jovana Vunduk, Anita Klaus, Maja Kozarski, Radovan Dordevic, Zoran Miladinovic, Ljubinko Jovanovic, Miomir Niksic, Leonardus Johannes Lambertus Donatus Van Griensven
Kaolinite and the modified natural zeolite minazel plus (M+) were used as supplements in substrate used for the production of the medicinal mushroom Grifola frondosa. Growth stimulation, expressed as yield and biological efficiency, was observed when M+ (1%) was added. The production cycle was shortened by half as a result of the zeolites' ion-exchange ability, stimulation of enzyme activity, and water retain capacity. Inductively coupled plasma optical emission spectrometry of fruiting bodies showed the absence of heavy metals (arsenic, cadmium, and lead), whereas the concentration of calcium increased greatly and the concentrations of iron, magnesium, and zinc increased moderately under the influence of M+...
2016: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/27910256/simultaneous-upgrading-of-furanics-and-phenolics-via-hydroxyalkylation-aldol-condensation-reactions
#9
Tuong V Bui, Tawan Sooknoi, Daniel E Resasco
The simultaneous conversion of cyclopentanone and m-cresol has been investigated on a series of solid acid catalysts. Both compounds are representative of biomass-derived streams. Cyclopentanone can be readily obtained from sugar-derived furfurals via Piancatelli rearrangement under reducing conditions. Cresol represents the family of phenolics, typically obtained from the depolymerization of lignin. In the first biomass conversion strategy proposed here, furfural is converted in high yields and selectivity to cyclopentanone (CPO) over metal catalysts such as Pd-Fe/SiO2 catalyst at 600 psia H2 and 150oC...
December 1, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27906387/hierarchically-porous-materials-synthesis-strategies-and-structure-design
#10
REVIEW
Xiao-Yu Yang, Li-Hua Chen, Yu Li, Joanna Claire Rooke, Clément Sanchez, Bao-Lian Su
Owing to their immense potential in energy conversion and storage, catalysis, photocatalysis, adsorption, separation and life science applications, significant interest has been devoted to the design and synthesis of hierarchically porous materials. The hierarchy of materials on porosity, structural, morphological, and component levels is key for high performance in all kinds of applications. Synthesis and applications of hierarchically structured porous materials have become a rapidly evolving field of current interest...
December 1, 2016: Chemical Society Reviews
https://www.readbyqxmd.com/read/27900833/integration-of-photothermal-effect-and-heat-insulation-to-efficiently-reduce-reaction-temperature-of-co2-hydrogenation
#11
Wenbo Zhang, Liangbing Wang, Kaiwen Wang, Munir Ullah Khan, Menglin Wang, Hongliang Li, Jie Zeng
The photothermal effect is applied in CO2 hydrogenation to reduce the reaction temperature under illumination by encapsulating Pt nanocubes and Au nanocages into a zeolitic imidazolate framework (ZIF-8). Under illumination, the heat generated by the photothermal effect of Au nanocages is mainly insulated in the ZIF-8 to form a localized high-temperature region, thereby improving the catalytic activity of Pt nanocubes.
November 30, 2016: Small
https://www.readbyqxmd.com/read/27898787/zeolite-combined-with-alum-and-polyaluminum-chloride-mixed-with-agricultural-slurries-reduces-carbon-losses-in-runoff-from-grassed-soil-boxes
#12
J G Murnane, R B Brennan, O Fenton, M G Healy
Carbon (C) losses from agricultural soils to surface waters can migrate through water treatment plants and result in the formation of disinfection by-products, which are potentially harmful to human health. This study aimed to quantify total organic carbon (TOC) and total inorganic C losses in runoff after application of dairy slurry, pig slurry, or milk house wash water (MWW) to land and to mitigate these losses through coamendment of the slurries with zeolite (2.36-3.35 mm clinoptilolite) and liquid polyaluminum chloride (PAC) (10% AlO) for dairy and pig slurries or liquid aluminum sulfate (alum) (8% AlO) for MWW...
November 2016: Journal of Environmental Quality
https://www.readbyqxmd.com/read/27895255/flue-gas-and-direct-air-capture-of-co2-by-porous-metal-organic-materials
#13
David G Madden, Hayley S Scott, Amrit Kumar, Kai-Jie Chen, Rana Sanii, Alankriti Bajpai, Matteo Lusi, Teresa Curtin, John J Perry, Michael J Zaworotko
Sequestration of CO2, either from gas mixtures or directly from air (direct air capture), is a technological goal important to large-scale industrial processes such as gas purification and the mitigation of carbon emissions. Previously, we investigated five porous materials, three porous metal-organic materials (MOMs), a benchmark inorganic material, ZEOLITE 13X: and a chemisorbent, TEPA-SBA-15: , for their ability to adsorb CO2 directly from air and from simulated flue-gas. In this contribution, a further 10 physisorbent materials that exhibit strong interactions with CO2 have been evaluated by temperature-programmed desorption for their potential utility in carbon capture applications: four hybrid ultramicroporous materials, SIFSIX-3-CU: , DICRO-3-NI-I: , SIFSIX-2-CU-I: and MOOFOUR-1-NI: ; five microporous MOMs, DMOF-1: , ZIF-8: , MIL-101: , UIO-66: and UIO-66-NH2: ; an ultramicroporous MOM, NI-4-PYC: The performance of these MOMs was found to be negatively impacted by moisture...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27892512/where-is-iron-in-erionite-a-multidisciplinary-study-on-fibrous-erionite-na-from-jersey-nevada-usa
#14
Alessandro F Gualtieri, Nicola Bursi Gandolfi, Simone Pollastri, Kilian Pollok, Falko Langenhorst
Fibrous erionite is a mineral fibre of great concern but to date mechanisms by which it induces cyto- and geno-toxic damage, and especially the role of iron associated to this zeolite species, remain poorly understood. One of the reasons is that we still don't know exactly where iron is in natural erionite. This work is focused on fibrous erionite-Na from Jersey (Nevada, USA) and attempts to draw a general model of occurrence of iron in erionite and relationship with toxicity mechanisms. It was found that iron is present as 6-fold coordinated Fe(3+) not part of the zeolite structure...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885785/osteogenic-activity-and-antibacterial-effect-of-porous-titanium-modified-with-metal-organic-framework-films
#15
Junyu Chen, Xin Zhang, Chao Huang, He Cai, Shanshan Hu, Qianbing Wan, Xibo Pei, Jian Wang
As a new class of crystalline nanoporous materials, metal-organic frameworks (MOFs) have recently been used for biomedical applications due to their large surface area, high porosity, and theoretically infinite structures. To improve the biological performance of titanium, MOF films were applied to surface modification of titanium. Zn-based MOF films composed of zeolitic imidazolate framework-8 (ZIF-8) crystals with nanoscale and microscale sizes (nanoZIF-8 and microZIF-8) were prepared on porous titanium surfaces by hydrothermal and solvothermal methods, respectively...
November 5, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27882639/imaging-the-atomic-position-of-light-cations-in-a-porous-network-and-the-europium-iii-ion-exchange-capability-by-aberration-corrected-electron-microscopy
#16
Alvaro Mayoral, Reece M Hall, Roksana Jackowska, Jennifer E Readman
In the present work, ETS-10 microporous titanosilicate has been synthesized and its structure characterized by means of powder XRD and aberration corrected scanning transmission electron microscopy (Cs -corrected STEM). For the first time, sodium ions have been imaged sitting inside the 7-membered rings. The ion-exchange capability has been tested by the inclusion of rare earth metals (Eu, Tb and Gd) to produce a luminescent material which has been studied by atomic-resolution Cs -corrected STEM. The data produced has allowed unambiguous imaging of light atoms in a microporous framework as well as determining the cationic metal positions for the first time, providing evidence of the importance of advanced electron microscopy methods for the study of the local environment of metals within zeolitic supports providing unique information of both systems (guest and support) at the same time...
November 24, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27880032/zeolite-based-dry-formulations-for-conservation-and-practical-application-of-paraburkholderia-phytofirmans-psjn
#17
Teresa Berninger, Birgit Mitter, Claudia Preininger
AIM: Producing dry, zeolite-based granular and powder inoculants of the Gram negative, plant growth-promoting bacterium Paraburkholderia phytofirmans PsJN. Key aspects were maintenance of cell viability during desiccation and throughout storage at ambient conditions. METHODS AND RESULTS: 20 additives and exopolysaccharide (EPS) produced by PsJN were screened for conserving cell viability of PsJN in air drying and lyophilization. Suitable combinations (e.g. skimmed milk + air drying) increased survival of PsJN up to 100,000-fold and maintained it for > seven months...
November 23, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27876869/discerning-the-location-and-nature-of-coke-deposition-from-surface-to-bulk-of-spent-zeolite-catalysts
#18
Arun Devaraj, Murugesan Vijayakumar, Jie Bao, Mond F Guo, Miroslaw A Derewinski, Zhijie Xu, Michel J Gray, Sebastian Prodinger, Karthikeyan K Ramasamy
The formation of carbonaceous deposits (coke) in zeolite pores during catalysis leads to temporary deactivation of catalyst, necessitating regeneration steps, affecting throughput, and resulting in partial permanent loss of catalytic efficiency. Yet, even to date, the coke molecule distribution is quite challenging to study with high spatial resolution from surface to bulk of the catalyst particles at a single particle level. To address this challenge we investigated the coke molecules in HZSM-5 catalyst after ethanol conversion treatment by a combination of C K-edge X-ray absorption spectroscopy (XAS), (13)C Cross polarization-magic angle spinning nuclear magnetic resonance (CP-MAS NMR) spectroscopy, and atom probe tomography (APT)...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27876241/recycling-of-typical-difficult-to-treat-e-waste-synthesize-zeolites-from-waste-cathode-ray-tube-funnel-glass
#19
Zhitong Yao, Daidai Wu, Jie Liu, Weihong Wu, Hongting Zhao, Junhong Tang
The disposal of waste cathode ray-tubes (CRTs) from old televisions and discarded computer monitors has become a major environmental concern worldwide. In this work, an open-loop recycling method was developed to synthesize zeolites using CRT funnel glass as the raw material. The effects of hydrothermal temperatures and pressure, n(SiO2/Al2O3) molar ratios and hydrothermal time on the resulting products were investigated. The results indicated that hydrothermal temperatures and pressure played critical roles in zeolite synthesis...
November 15, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27874242/template-framework-interactions-in-tetraethylammonium-directed-zeolite-synthesis
#20
Joel E Schmidt, Donglong Fu, Michael W Deem, Bert M Weckhuysen
Zeolites, having widespread applications in chemical industries, are often synthesized using organic templates. These can be cost-prohibitive, motivating investigations into their role in promoting crystallization. Herein, the relationship between framework structure, chemical composition, synthesis conditions and the conformation of the occluded, economical template tetraethylammonium (TEA(+) ) has been systematically examined by experimental and computational means. The results show two distinct regimes of occluded conformer tendencies: 1) In frameworks with a large stabilization energy difference, only a single conformer was found (BEA, LTA and MFI)...
November 22, 2016: Angewandte Chemie
keyword
keyword
102762
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"