Relevant bibliographies by topics / Iridium modifier

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Iridium modifier'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Iridium modifier"

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Rademeyer, Cornelius J., Bernard Radziuk, Natalia Romanova, Nils Petter Skaugset, Asbj�rn Skogstad, and Yngvar Thomassen. "Permanent iridium modifier for electrothermal atomic absorption spectrometry." Journal of Analytical Atomic Spectrometry 10, no. 10 (1995): 739. http://dx.doi.org/10.1039/ja9951000739.

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Kot, Monika, Robert Wojcieszak, Ewa Janiszewska, Mariusz Pietrowski, and Michał Zieliński. "Effect of Modification of Amorphous Silica with Ammonium Agents on the Physicochemical Properties and Hydrogenation Activity of Ir/SiO2 Catalysts." Materials 14, no. 4 (February 18, 2021): 968. http://dx.doi.org/10.3390/ma14040968.

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The modification of commercial silica with solutions of NH4F or NH4Cl salts, followed by thermal treatment, enabled generation of the acidic sites in SiO2 and changed its textural properties. The use of ammonium salts solution also caused the generation of additional porosity. Using NH4F solution caused significant decrease in the specific surface area and the increase in the average pore diameter. The number and strength of resulting acid sites depend on the nature of anion in the applied ammonium salt and the concentration of salt solution. It has been found that the sample treated with NH4F presented higher total acidity (TPD–NH3) and the amount as well as the strength of acid sites increased with the concentration of the used modifier. As modified amorphous SiO2 materials used as a support for iridium (1 wt %, Ir(acac)3) nanoparticles permitted to obtain highly active catalysts for toluene hydrogenation under atmospheric pressure. The highest activity (expressed as the apparent rate and TOF) was obtained for iridium catalysts supported on silica modified by NH4F with the highest acidity. The modification of silica with NH4F favors the generation of centers able to adsorb toluene, which results in higher activity of this catalyst.
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Bulska, Ewa, Marek Piaścik, and Krystyna Pyrzyńska. "Iridium Modifier for Determination of Selenium by Graphite Furnace Atomic Absorption Spectrometry." Analytical Letters 33, no. 7 (January 2000): 1399–408. http://dx.doi.org/10.1080/00032710008543130.

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Pandey, Rina, Ju Won Lim, Jung Hyuk Kim, Basavaraj Angadi, Ji Won Choi, and Won Kook Choi. "Performance enhancement in organic photovoltaic solar cells using iridium (Ir) ultra-thin surface modifier (USM)." Applied Surface Science 444 (June 2018): 97–104. http://dx.doi.org/10.1016/j.apsusc.2018.03.012.

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Hou, Xiandeng, Zheng Yang, and Bradley T. Jones. "Determination of selenium by tungsten coil atomic absorption spectrometry using iridium as a permanent chemical modifier." Spectrochimica Acta Part B: Atomic Spectroscopy 56, no. 2 (February 2001): 203–14. http://dx.doi.org/10.1016/s0584-8547(00)00305-0.

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Piaścik, Marek, and Ewa Bulska. "Performance of permanent iridium modifier in the presence of corrosive matrix in graphite furnace atomic absorption spectrometry." Fresenius' Journal of Analytical Chemistry 371, no. 8 (October 27, 2001): 1079–82. http://dx.doi.org/10.1007/s00216-001-1107-8.

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Grinberg, Patricia, and Reinaldo Calixto de Campos. "Iridium as permanent modifier in the determination of lead in whole blood and urine by electrothermal atomic absorption spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 56, no. 10 (October 2001): 1831–43. http://dx.doi.org/10.1016/s0584-8547(01)00162-8.

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MEERAVALI, Noorbasha N., M. A. REDDY, and Sunil Jai KUMAR. "Cloud Point Extraction of Trace Metals from Seawater and Determination by Electrothermal Atomic Absorption Spectrometry with Iridium Permanent Modifier." Analytical Sciences 23, no. 3 (2007): 351–56. http://dx.doi.org/10.2116/analsci.23.351.

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de Amorim, Flávia Regina, Clésia Cristina Nascentes, Milton Batista Franco, and José Bento Borba da Silva. "Fast Determination of Manganese in Milk and Similar Infant Food Samples Using Multivariate Optimization and GF AAS." International Journal of Spectroscopy 2011 (October 13, 2011): 1–7. http://dx.doi.org/10.1155/2011/810641.

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Manganese is an essential element, but high levels in foods can be toxic mainly for children. A fast and efficient method to determine Mn in milk and other infant foods using slurries and liquid samples is presented. Slurries were prepared in ultrapure water with 10 minutes of sonication. Liquid samples were diluted in ultrapure water when necessary. Multivariate optimization was used to establish some optimal analytical parameters through a fractional factorial design and a central composite design. Slurred and diluted samples were analyzed directly by GF AAS. The method presented limit of detection of (0.98±0.04) μg L−1, characteristic mass of (2.9±0.3) pg (recommended value 2 pg), RSD of 2.3% (n=5), and linear range from 0.98 to 20.0 μg L−1 using iridium as permanent modifier. The accuracy was evaluated analyzing two certified reference materials: nonfat milk powder (SRM1549) and whole milk powder (SRM8435). The powdered samples concentrations were between 0.210 and 26.3 μg g−1.
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Borges, Daniel L. G., Lúcia F. Dias, Márcia A. M. S. da Veiga, and Adilson J. Curtius. "Determination of cadmium in sediments and in sewage sludge by slurry sampling electrothermal atomic absorption spectrometry using iridium as permanent modifier." Journal of the Brazilian Chemical Society 14, no. 2 (April 2003): 291–96. http://dx.doi.org/10.1590/s0103-50532003000200017.

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Dissertations / Theses on the topic "Iridium modifier"

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Furdíková, Zuzana. "Studium generování, záchytu a atomizace těkavých hydridů pro metody atomové spektrometrie." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-233290.

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Interference effects of co-generated hydrides of arsenic, antimony, bismuth and selenium on trapping behavior of selenium or antimony hydrides (analytes) within iridium modified, transversely heated graphite tube atomizer (THGA) was investigated. A twin-channel hydride generation system was used for independent separate generation and introduction of analyte and interferent hydrides, i.e. in simultaneous and/or sequential analyte-interferent and interferent-analyte mode of operation. Influence of the analyte and modifier mass, interferent amount, trapping temperature and composition of the gaseous phase was studied. A simple approach for elimination of mutual interference effects by modification of the gaseous phase with oxygen in substoichiometric ratio to chemically generated hydrogen is proposed and suppression of these interference effects is demonstrated. A hypothesis on mechanism of trapping and mutual interference effects is drawn.
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Bulska, E., M. Piascik, D. Katskov, N. Darangwa, and M. Grotti. "Investigation of aging processes of graphite tubes modified with iridium and rhodium used for atomic spectrometry." Elsevier, 2006. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000794.

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UV spectrometry (187–380 nm) with charge coupled device (CCD) detection was used to study the evolution of absorption spectra during the vaporization of various species in the pyrocoated graphite furnace, with electrodeposited Ir and Rh as modifiers. In order to mimic a typical matrix composition, various salts of aluminum, manganese, copper, magnesium, sodium, and lead were used in microgram amounts. Changes in spectra and vapor release rate, along with aging of the tubes in the repetitive temperature cycles, were observed. Compared to the unmodified pyrocoated tubes, the presence of Ir or Rh causes a significant reduction in the vaporization efficiency, especially for microgram amounts of copper and aluminum introduced as nitrates, and manganese introduced as a sulfate. The vaporization efficiency, for magnesium and sodium as chlorides, and for lead as a sulfate, remained unchanged. Interestingly, the aging of the tubes was accompanied by partial restoration of the spectral characteristics for unmodified tubes. For example, with unmodified pyrocoated tubes, the vaporization spectrum, appearing as a consequence of the decomposition of aluminum nitrate, consisted of Al2O bands overlapped by Al atomic lines. In the freshly modified tubes, intensities of those lines and bands were substantially reduced, and in this case, the dominance of AlO molecules was observed. The efficiency of vaporization of aluminum species increased in the aged modified tubes. The scanning electron microscopy (SEM) images of the modified surfaces for the new and aged tubes indicated that aging of the tubes is accompanied by the destruction of the pyrocoating, formation of pyrographite shells around the areas where the modifier was electrodeposited, and finally, complete substitution of the metal on the graphite surface by pyrographite debris.
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Brown, Loren. "Microwave-assisted Synthesis of Modified Cyclopentadienyl Iridium and Rhodium Chloro-bridged Dimers." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71373.

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The present work describes the design and synthesis of a series of dimers [(η5 - ring)MCl]2(μ2 -Cl)2, (where (η5 -ring)MCl = (η5 -Me4C5R)Rh(III)Cl or (η5 -Me4C5R)Ir(III)Cl). Iridium and rhodium dimeric complexes were synthesized via a microwave reaction and directly compared through single-crystal X-ray crystallography. Finally, the dimeric complexes were evaluated as potential oxidation catalysts. The modified HCp*R (R = isopropyl, n-butyl, isobutyl, sec-butyl, n-pentyl, n-hexyl, nheptyl, n-octyl, phenyl, benzyl, phenethyl, cyclohexyl, and cyclopentyl) type ligands were synthesized by reaction of 2,3,4,5-tetramethylcyclopent-2-en-1-one with the respective Grignard reagent (RMgX), followed by elimination of water under acidic conditions to produce the tetramethyl(alkyl or aryl)cyclopentadienes in moderate to excellent yields (39 - 98%). Reaction of the HCp*R ligands with [M(COD)](μ2 -Cl)2 (M = Rh, Ir; COD = 1,5-cyclooctadiene) gave the dimeric complexes [Cp*RMCl]2(μ2 -Cl)2 in yields ranging from 16 - 96%. The dimers were characterized by nuclear magnetic resonance (NMR)spectroscopy, single-crystal X-ray diffraction (XRD) (supplemented by powder XRD), high-resolution mass spectrometry (HRMS), and elemental analysis. Complexes studied by XRD were analyzed to understand the bond lengths and bond angles throughout each complex. The dimeric complexes synthesized, will facilitate a complete study on how the R group influences catalytic activity.
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Nxusani, Ezo. "Novel 3-mercaptopropionic acid capped iridium selenide quantum dots modified electrochemical immunosensor for the detection of fish toxin, nodularin." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/4616.

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>Magister Scientiae - MSc
A novel 3-mercaptopropionic acid capped iridium selenide quantum dots based label free impedimetric immunosensor was successfully constructed. The 3-mercaptopropionic acid capped iridium selenide quantum dots synthesized were studied using HRTEM, revealing the formation of very small sizes, of about 3 nm. The optical Uv-Vis absorption wavelength of the quantum dots is blue-shifted, a phenomenon explained by the effective mass approximation (EMA) for semiconducting materials with sizes below 10 nm. Using cyclic voltammetry it is noted that the quantum dots have interesting electro-catalytical properties. The immunosensor proved to be sensitive towards nodularin, with a very low detection limit of 0.009 ng/mL and is significantly lower than the recent anti-nodularin ELISA kit developed by (Zhou et al., 2011) which has a detection limit of 0.16 ng/mL.Also the dection limit of the immunosensor is below the South African guideline value for microcystin-LR (0-0.8) μg/L (DWAF; 1996). The calibration curve of the 3MPA-GaSe nanocrystal based biosensor was successfully constructed, which exhibited a trend described by Michaelis-Menten, a typical behaviour of enzymatic biosensors. The detection limit of the biosensor is 0.004 nM and is significantly lower than the action limit of 17beta-estradiol, (1.47 x 10-10 M).
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Fang, Lei. "Development and Characterization of an Iridium-Modified Electrochemical Biosensor for Potential Diabetic Patient Management." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1223049333.

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Thesis (Ph.D.)--Case Western Reserve University, 2008
Department of Chemical Engineering Abstract Title from OhioLINK abstract screen (viewed on 10 April 2009) Available online via the OhioLINK ETD Center
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Nicholls, Dylan. "Scanning Tunneling Microscopy and Spectroscopy studies of zinc-phthalocyanine adsorption on SiC(0001) and iridium-modified silicon surfaces." Thesis, The University of North Dakota, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3626206.

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Studies were performed on two seemingly different topics, molecular thin films on graphite/graphene and metal induced changes in various cuts of silicon (Si) surfaces. However, both projects share the underlying theme of self-assembly. Since nature can rely upon self-assembly at the nano-scale, all that is needed is to discover functional means to create components for integrated circuits as well as electronic and photonic devices.

Scanning Tunneling Microscopy and Spectroscopy (STM/STS) studies were carried out to characterize the morphology of thin porphyrin films on graphite and the effects of Zn-Phthalocyanine (Zn-Pc) adsorption on the electronic properties of graphene. It was found that the metal atom complex of porphyrin molecules can determine the morphology, intermolecular forces and ability to create thin films on a graphite surface. Zn-Pc adsorption onto graphene shifts the position of the Dirac point with respect to Fermi level which leads to localized p- and n-type doping effects in the graphene substrate.

STM, STS and Low-Energy Electron Diffraction (LEED) measurements were carried out on iridium (Ir) modified Si(111) and Si(100) surfaces. The Ir-modified Si(111) surface exhibited a √7×√7 R 19.1° domain formation that was composed of Ir-ring clusters. LEED measurements showed that on Ir-modified Si(100), a p(2×2) structure arose after annealing at ~700°C. The proposed model for the Ir-silicide nanowires shows that an Ir atom replaces every other Si dimer along the Si dimer rows of Si(100)-2×1.

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Hsueh, Chang-Jung. "Development of Electrochemical Biosensors for Potential Liver Disease Detections of ALT & AST and Application of Ionic Liquid into Biosensing-Modified Electrodes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1364989187.

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Caix, Chrystelle. "Propriétés électrochimiques des complexes du type ((eta5-Me5C5)M(L)Cl)+ (M=Ir(III), Rh(III)) en solution et immobilisés dans des films de polymère : application à l'électrocatalyse." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10154.

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Ce memoire est consacre a l'evaluation des possibilites offertes par les complexes de coordination de rhodium (iii) et d'iridium (iii) du type (#5-me#5c#5)m(l)x#+ en electrocatalyse. Nous nous sommes plus particulierement interesses a leur application (en phase homogene ou immobilises a la surface d'une electrode sous forme de films polypyrroliques) a l'electroreduction catalytique des protons en hydrogene moleculaire, a l'hydrogenation electrocatalytique de substrats organiques insatures, et a la reduction electrocatalytique du dioxyde de carbone. Une partie de ce travail a consiste a etudier en detail les proprietes electrochimiques des complexes chlorure d'iridium et de rhodium du type (#5-me#5c#5)m(l)cl#+ et a determiner les conditions permettant d'electrogenerer quantitativement les complexes hydrure correspondants, intermediaires proposes dans de nombreux processus catalytiques. Une etude similaire a ete conduite sur des electrodes modifiees par electropolymerisation de ces complexes, et de nouveaux materiaux moleculaires d'electrodes contenant les complexes hydrure ont ainsi ete realises. Ces complexes hydrure ont ete caracterises, en particulier pour l'iridium, par differentes methodes spectroscopiques, aussi bien en solution que sur electrodes modifiees. Enfin ces complexes et plus specialement ceux du rhodium se sont averes etre de bons catalyseurs pour l'electroreduction des protons appliquee ou non a l'hydrogenation de substrats organiques insatures et a l'electrocatalyse de la reduction du co#2 en ions formiate en milieu hydroorganique. Nous avons montre par ailleurs que, pour ces deux dernieres applications, l'immobilisation du complexe dans un film de polymere defavorise la reaction d'insertion du substrat ou du co#2 dans la liaison metal-hydrure au profit de la reduction des protons
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Tingry, Sophie. "Synthèse et application en hydrogénation électrocatalytique de films de polypyrrole fonctionnalisés par des complexes du rhodium et de l'iridium." Université Joseph Fourier (Grenoble ; 1971-2015), 1996. http://www.theses.fr/1996GRE10137.

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Ce memoire est consacre a la synthese d'electrodes modifiees (em) par des films de polypyrroles fonctionnalises par des complexes polypyridiniques de metaux de transition et a leur application en electrocatalyse en milieu aqueux. Une partie de ce travail de recherche a ete orientee vers l'amelioration de l'efficacite, de la stabilite et de la selectivite de films de polymeres derives des complexes rh(l)#2(cl)#2#+ (l=2,2'-bipyridine ou 1,10-phenanthroline substituees), vis-a-vis de l'hydrogenation electrocatalytique (hec) de substrats organiques insatures. En particulier, nous avons montre que des complexes contenant des ligands chiraux sont capables de catalyser, en phase homogene et supportee, l'hec enantioselective de l'acetophenone. Le mecanisme de ces hec a pu etre precise avec l'etude electrochimique des complexes du type rh#i#i#i(x)(y)(l)(p)#2#+ (x, y = h ou cl, p = phosphine tertiaire) en solution homogene et en phase polymerique. La mise en evidence de l'electrogeneration des complexes hydrure a partir des complexes chlorure correspondants et l'activite electrocatalytique de ces complexes vis-a-vis de l'hydrogenation de substrats organiques a confirme la participation d'intermediaires hydrure dans le mecanisme de l'hec. Enfin nous avons developpe une technique, qui avait ete peu utilisee jusqu'a present, pour elaborer des films de poly(pyrrole-m#i(diene)(l)#+ (m = rh ou ir, diene = cod, nbd ou ed, l = 2,2'-bipyridine), par complexation in situ de complexes precurseurs m#i(diene)cl#2 dans des films de ligands pre-deposes sur electrode par electropolymerisation. Ce procede nous a permis de synthetiser des films de complexes du rh(i) et de l'ir(i) qui ne peuvent etre obtenus par electropolymerisation directe, a cause de leur instabilite redox. Ce travail presente les conditions d'elaboration de ces em, leurs etudes electrochimiques et spectroscopiques, ainsi que leur application en hec
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Book chapters on the topic "Iridium modifier"

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Oriakhi, Christopher O. "Systems of Measurement." In Chemistry in Quantitative Language. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780195367997.003.0006.

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Chemistry is an experimental science that involves measurement of the magnitude of various properties of substances. Measurements generate numbers, and we need units attached to these numbers so we can tell what exactly is being measured. Some examples of quantities measured include amount, mass, pressure, size, temperature, time, volume, etc. There are several systems of units, for example, the English system and the metric system. The metric system is the most commonly used system of measurement in chemistry. In 1960, a modernized version of the metric system known as the Systeme Internationale (or SI system) was recommended for worldwide adoption. The SI, based on the metric system, consists of seven fundamental units and several units derived from them. These units serve all scientific measurements. The seven fundamental units are listed in table 2-1. The fundamental units do have some shortcomings. For example, in some cases the base unit is inconveniently large or small. To overcome this, the SI units can be modified through the use of prefixes. The prefixes define multiples or fractions of the base or fundamental units. Some examples are listed in table 2-2. Mass, length, and time are important quantities commonly measured in science, which are assigned fundamental units. The standard unit of mass in the SI is the kilogram (kg), which is defined as the mass of a certain block of platinum–iridium alloy, also known as the prototype kilogram, kept in a vault at the International Bureau of Weights and Measures, in Sevres, France. Other mass units that are related to the kilogram include gram (g), milligram (mg), and microgram (μg). Here is how they are related: 1000 g = 1 kg 1000 mg = 1 g 1,000,000 μg = 1 g Note that the symbol for grams is g, not gm, gms, gr, or anything else. The SI unit of length is the meter (m), which is defined as the distance light travels in approximately 1/299,792,458 second.
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Conference papers on the topic "Iridium modifier"

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Wang, Tianyou, Shuliang Liu, Hongjun Xu, Xing Li, Maolin Fu, Landong Li, and Naijia Guan. "Evaluation of In-Situ Synthesized Monolithic Metal-MFI/Cordierite Catalysts to Remove NOx From Lean Exhaust." In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1253.

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In this study, ZSM-5 zeolites were successfully in situ synthesized on the surface of honeycomb cordierite substrate and certified by XRD and SEM techniques. Strong interaction between zeolite and substrate has been found during in-situ synthesis, and hydrothermal stabilities of the zeolites was improved by entailing. The in-situ synthesized monolithic ZSM-5/cordierite showed superior thermal and hydrothermal stabilities. Cu-ZSM-5/cordierite was prepared by ion-exchange and impregnation methods were studied as catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NOx) in a lean-burn gasoline engine. Engine test results show that NOx emission was decreased by reductants of HC and CO in the exhaust gas without any other extra reducing agents. It also exhibited high activities. Using Cu-ZSM-5/cordierite, the maximum NOx conversion efficiency to N2 reached to 64% at the exhaust temperature of 400 °C and the gas hourly space velocity (GHTV) of 25 000/h. Meanwhile, the HC conversion efficiency was about 60%, while CO was little converted. Cu-ZSM-5/cordierite also showed good duration and anti-poison properties. Furthermore, the activated temperature of the Cu-ZSM-5/cordierite was decreased and the NOx conversion was increased via addition of iridium as a modifier.
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Van Zante, Dale E., Kenneth L. Suder, Anthony J. Strazisar, and Theodore H. Okiishi. "An Improved Aspirating Probe for Total-Temperature and Total-Pressure Measurements in Compressor Flows." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-222.

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The aspirating probe originally designed by Epstein and Ng at MIT was modified by replacing the two platinum coated tungsten hot wires normally used with platinum iridium alloy wires. The resulting improved unsteady total pressure and total temperature resolution of the modified probe is demonstrated. Flowfield measurements were made downstream of NASA Rotor 37 for a part speed operating condition to test the performance of the probe. Time resolved blade-to-blade total temperature and total pressure as calculated from the two platinum iridium hot wire voltages are shown. The flowfield measurements are compared with independent measurements of total pressure with high response transducers and total temperature calculated from laser anemometer measurements. Limitations of a more often used unsteady temperature data reduction method which involves only one aspirating probe hot wire voltage and a high-response pressure measurement are discussed.
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Dewandaru, R. K. P., J. Gunlazuardi, and T. A. Ivandini. "Preparation of iridium-modified boron-doped diamond (BDD) electrodes for electroreduction of CO2." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064095.

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