Relevant bibliographies by topics / Dehydroxylace

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  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Dehydroxylace'

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

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Journal articles on the topic "Dehydroxylace"

1

Drits, Victor A., Boris A. Sakharov, Olga V. Dorzhieva, Bella B. Zviagina, and Holger Lindgreen. "Determination of the phase composition of partially dehydroxylated kaolinites by modelling their X-ray diffraction patterns." Clay Minerals 54, no. 3 (August 1, 2019): 309–22. http://dx.doi.org/10.1180/clm.2019.39.

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AbstractModelling of experimental X-ray diffraction (XRD) patterns is used to determine the phase composition of partially dehydroxylated kaolinite samples. To identify unambiguously the presence of two or three phases in the heated kaolinite samples, the full range of their XRD patterns has to be analysed. Two different kaolinites, from Imerys (UK) and from Georgia (USA; KGa-21), were studied. The heating temperatures were selected to cover the entire range of dehydroxylation for both kaolinites (400–550°C for Imerys and 400–495°C for KGa-21). Two different dehydroxylation pathways were observed. At each stage of partial dehydroxylation, the kaolinite from Imerys consisted of the original, non-dehydroxylated kaolinite and of a fully dehydroxylated phase, metakaolinite. During partial dehydroxylation of kaolinite KGa-21, each product formed at a given heating temperature consisted of three phases: the original kaolinite; a dehydroxylated phase, metakaolinite; and a phase with diffraction features corresponding to a defective kaolinite-like structure. To determine the content of metakaolinite in a partially dehydroxylated specimen, its experimental XRD pattern was reproduced by the optimal summation of the diffraction patterns of the initial kaolinite and metakaolinite. A procedure that reveals the basic diffraction features of the third phase is suggested. The XRD patterns and thus the structures of the metakaolinites formed after dehydroxylation of the Imerys and KGa-21 samples differ substantially. The conventional determination of the initial kaolinite and metakaolinite contents in partially dehydroxylated kaolinite based on the analysis of basal reflections and weight losses may lead to overlooking the formation of the intermediate phases.
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2

Thomas, L. A., A. King, G. L. French, G. M. Murphy, and R. H. Dowling. "Cholylglycine hydrolase and 7α-dehydroxylase." Clinica Chimica Acta 268, no. 1-2 (December 1997): 61–72. http://dx.doi.org/10.1016/s0009-8981(97)00169-1.

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3

Dainyak, Lidia G., Bella B. Zviagina, Viacheslav S. Rusakov, and Victor A. Drits. "Interpretation of the nontronite-dehydroxylate Mossbauer spectrum using EFG calculations." European Journal of Mineralogy 18, no. 6 (December 20, 2006): 753–64. http://dx.doi.org/10.1127/0935-1221/2006/0018-0753.

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4

Halbert, Stéphanie, Simona Ispas, Christophe Raynaud, and Odile Eisenstein. "Modelling the surface of amorphous dehydroxylated silica: the influence of the potential on the nature and density of defects." New Journal of Chemistry 42, no. 2 (2018): 1356–67. http://dx.doi.org/10.1039/c7nj03922k.

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5

Drits, V. A., and A. Derkowski. "Kinetic behavior of partially dehydroxylated kaolinite." American Mineralogist 100, no. 4 (April 1, 2015): 883–96. http://dx.doi.org/10.2138/am-2015-5083.

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6

Conley, Matthew P., Aaron J. Rossini, Aleix Comas-Vives, Maxence Valla, Gilles Casano, Olivier Ouari, Paul Tordo, Anne Lesage, Lyndon Emsley, and Christophe Copéret. "Silica-surface reorganization during organotin grafting evidenced by 119Sn DNP SENS: a tandem reaction of gem-silanols and strained siloxane bridges." Phys. Chem. Chem. Phys. 16, no. 33 (2014): 17822–27. http://dx.doi.org/10.1039/c4cp01973c.

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7

Salnikov, Oleg G., Hsueh-Ju Liu, Alexey Fedorov, Dudari B. Burueva, Kirill V. Kovtunov, Christophe Copéret, and Igor V. Koptyug. "Pairwise hydrogen addition in the selective semihydrogenation of alkynes on silica-supported Cu catalysts." Chemical Science 8, no. 3 (2017): 2426–30. http://dx.doi.org/10.1039/c6sc05276b.

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8

Del Rosal, Iker, Iann C. Gerber, Romuald Poteau, and Laurent Maron. "Grafting of lanthanide complexes on silica surfaces dehydroxylated at 200 °C: a theoretical investigation." New Journal of Chemistry 39, no. 10 (2015): 7703–15. http://dx.doi.org/10.1039/c5nj01645b.

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9

Högerl, Manuel P., Li Min Serena Goh, Edy Abou-Hamad, Samir Barman, Oliver Dachwald, Farhan Ahmad Pasha, Jeremie Pelletier, et al. "SOMC grafting of vanadium oxytriisopropoxide (VO(OiPr)3) on dehydroxylated silica; analysis of surface complexes and thermal restructuring mechanism." RSC Advances 8, no. 37 (2018): 20801–8. http://dx.doi.org/10.1039/c8ra02419g.

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10

Adjei, Stephen, Salaheldin Elkatatny, Pranjal Sarmah, and Gonzalo Chinea. "Investigation of Dehydroxylated Sodium Bentonite as a Pozzolanic Extender in Oil-Well Cement." SPE Drilling & Completion 36, no. 03 (April 29, 2021): 730–37. http://dx.doi.org/10.2118/205487-pa.

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Summary Fly ash, which is a pozzolan generated as a byproduct from coal-powered plants, is the most used extender in the design of lightweight cement. However, the coal-powered plants are phasing out due to global-warming concerns. There is the need to investigate other materials as substitutes to fly ash. Bentonite is a natural pozzolanic material that is abundant in nature. This pozzolanic property is enhanced upon heat treatment; however, this material has never been explored in oil-well cementing in such form. This study compares the performance of 13-ppg heated (dehydroxylated) sodium bentonite and fly-ash cement systems. The raw (commercial) sodium bentonite was dehydroxylated at 1,526°F for 3 hours. Cement slurries were prepared at 13 ppg using the heated sodium bentonite as partial replacements of cement in concentrations of 10 to 50% by weight of blend. Various tests were done at a bottomhole static temperature of 120°F, bottomhole circulating temperature of 110°F, and pressure of 1,000 psi or atmospheric pressure. All the dehydroxylated sodium bentonite systems exhibited high stability, thickening times in the range of 3 to 5 hours, and a minimum 24-hour compressive strength of 600 psi. At a concentration of 40 and 50%, the 24-hour compressive strength was approximately 800 and 787 psi, respectively. This was higher than a 13-ppg fly-ash-based cement designed at 40% cement replacement (580 psi).
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Dissertations / Theses on the topic "Dehydroxylace"

1

Křečková, Magdaléna. "Kinetika heterogenních procesů v technologii silikátů - dehydroxylace a rozpouštění jílových minerálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-233360.

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The first part of the thesis discuss general characterization of heterogeneous processes in silicates. This part is focused on kinetics of heterogeneous processes and mathematical description of reactions time behavior. The other part describes important technologies in silicate industry such as sintering, solid matter decomposition, transition modification, etc. Another chapter deals mineralogy, structure and properties of eminent silicate raw materials. Emphases is given to characterization of clay minerals and their utilising. The experimental part handle the analytic techniques used for investigation of thermal decompostion, dehydroxylation, crystalization of Al-Si spinel phase and sintering process of washed kaolin Sedlec Ia from the region Carlsbad (Czech Republic). Concluding chapter reports on results of experimental work.
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2

Azzi, Joachim. "Generation of Well-Defined Pairs of Silylamine on Highly Dehydroxylated SBA-15: Application to the Surface Organometallic Chemistry of Zirconium." Thesis, 2012. http://hdl.handle.net/10754/255095.

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Design of a new well-defined surface organometallic species [O-(=Si–NH)2Zr(IV)Np2] has been obtained by reaction of tetraneopentyl zirconium (ZrNp4) on SBA-15 surface displaying mainly silylamine pairs [O-(=Si–NH2)2]. These surface species have been achieved by an ammonia treatment of a highly dehydroxylated SBA-15 at 1000°C (SBA-151000). This support is known to contain mainly strained reactive siloxane bridges (≡Si-O-Si≡)[1] along with a small amount of isolated plus germinal silanols =Si(OH)2. Chemisorption of ammonia occurs primarily by opening these siloxane bridges[2] to generate silanol/silylamine pairs [O-(=Si–NH2)(=SiOH)] followed by substitution of the remaining silanol. Further treatment using hexamethyldisilazane (HMDS) results in the protection of the isolated remaining silanol groups by formation of ≡Si-O-SiMe3 and =Si(OSiMe3)2 but leaves ≡SiNH2 untouched. After reaction of this functionalized surface with ZrNp4, this latter displays mainly a bi-podal zirconium neopentyl organometallic complex [O-(=Si–NH)2Zr(IV)Np2] which has been fully characterized by diverse methods such as infrared transmission spectroscopy, magic angle spinning solid state nuclear magnetic resonance, surface elemental analysis, small angle X-ray powder diffraction (XRD), nitrogen adsorption and energy filtered transmission electron microscopy (EFTEM). These different characterization tools unambiguously prove that the zirconium organometallic complex reacts mostly with silylamine pairs to give a bi-podal zirconium bis-neopentyl complex, uniformly distributed into the channels of SBA-151000. Therefore this new material opens a new promising research area in Surface Organometallic Chemistry which, so far, was dealing mainly with O containing surface. It is expected that vicinal amine functions may play a very different role as compared with classical inorganic supports. Given the importance in the last decades of N containing ligands in catalysis, one may expect important prospects…
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Book chapters on the topic "Dehydroxylace"

1

"Bile-acid 7α-dehydroxylase." In Class 1 · Oxidoreductases, 728. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85188-2_107.

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2

"Bile-acid 7 α-dehydroxylase." In Class 1 · Oxidoreductases, 774–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85188-2_113.

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