Journal ArticleDOI
Acidity characterization of a titanium and sulfate modified vermiculite
Willinton Y. Hernández,Miguel Ángel Centeno,José Antonio Odriozola,Sonia Moreno,Rafael Molina +4 more
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TLDR
In this paper, a natural vermiculite has been modified with titanium and sulfated by the intercalation and impregnation method in order to optimize the acidity of the clay mineral, and characterization of samples were analyzed by X-ray fluorescence (XRF), XRD, nitrogen adsorption isotherms, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature programmed desorption with ammonia (TPD-NH 3 ).About:
This article is published in Materials Research Bulletin.The article was published on 2008-07-01. It has received 9 citations till now. The article focuses on the topics: Sulfate & Vermiculite.read more
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Complex Formation via Hydrogen bonding between Rhodamine B and Montmorillonite in Aqueous Solution
Yanfen Fang,Ao Zhou,Wei Yang,Tirusew Araya,Yingping Huang,Ping Zhao,David Johnson,Jianzhu Wang,Zhiyong Jason Ren +8 more
TL;DR: In-situ attenuated total reflectance Fourier transform infrared (in-Situ ATR-FTIR) spectroscopy indicated that a nitrogen atom on RhB complexes with a metal hydroxyl on an MMT edge through a water bridge is important to hydrogen bond formation.
Journal Article
Characterization of vermiculite by xrd and spectroscopic techniques
TL;DR: A natural mineral from Santa Marta-Colombia used as the starting material in the synthesis of pillared clays has been characterized by several techniques, including X-ray diffraction, Xray fluorescence, electronic paramagnetic resonance, aluminum nuclear magnetic resonance and scanning electron microscopy as discussed by the authors.
Journal ArticleDOI
Decane hydroconversion with Al-Zr, Al-Hf, Al-Ce-pillared vermiculites
TL;DR: In this paper, a series of vermiculites with mixed precursors of Al-Zr, Al-Hf and Al-Ce were obtained from natural vermiculate subjected to a process of negative charge reduction through hydrothermal treatment, and the catalytic activity of the solids evaluated in the decane hydroconversion was superior to that of recognized pillared clays and comparable to those of very active catalysts such as zeolites USY.
Journal ArticleDOI
Microstructural Analysis and Magnetic Characterization of Native and Magnetically Modified Montmorillonite and Vermiculite
Yvonna Jirásková,Jiri Bursik,Jana Seidlerová,Katerina Mamulova Kutlakova,Ivo Safarik,Mirka Safarikova,Kristyna Pospiskova,O. Zivotsky,O. Zivotsky +8 more
TL;DR: In this article, two clay minerals of the similar 2.1 layer structure and chemical composition, vermiculite and montmorillonite, were studied using a wide spectrum of experimental methods in their original states and the magnetically modified states after mixing with microwave-synthesized iron oxide particles.
Journal ArticleDOI
Approach to a descriptive model of charge reduction in vermiculite by hydrothermal treatment
TL;DR: In this paper, a thermal treatment of vermiculite was performed in the presence of water vapor in order to reduce the negative charge of the material and enhance its resistance to acid washing.
References
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Book
Crystal Structures of Clay Minerals and their X-ray Identification
G. W. Brindley,G. Brown +1 more
TL;DR: In the years 1930-1950 clay mineral identification involved mainly a combination of X-ray powder diffraction and chemical analysis with some assistance from other techniques, notably differential thermal analysis.
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Baseline Studies of the Clay Minerals Society Source Clays: Infrared Methods
Jana Madejová,Peter Komadel +1 more
TL;DR: The interpretation of the absorption spectra of the Source Clays in the middle-IR (MIR) region (4000-400 cm−1) given here follows those of Farmer and Russell (1964), Farmer (1974a, 1979) and Russell and Fraser (1994).
Book
Infrared Spectroscopy of Adsorbed Species on the Surface of Transition Metal Oxides
A. A. Davydov,Colin H. Rochester +1 more
TL;DR: In infrared spectroscopy, the state of surface cations on oxide catalysts was characterized by IR study of the absorbed probe molecules CO and NO complexation of alkenes on oxide surfaces as mentioned in this paper.
Journal ArticleDOI
Pillared Clays as Catalysts
TL;DR: Intercalated clays are a new class of materials, in which an homogeneous distribution of micropores can be obtained with pore openings varying from 4 A to 18 A according to the type of pillars.
Journal ArticleDOI
Acid Sites in Sulfated and Metal-Promoted Zirconium Dioxide Catalysts
V. Adeeva,J.W. de Haan,J.J. Janchen,V. Schuenemann,G.D. Lei,L.J.M. van de Ven,Wolfgang M.H. Sachtler,van Ra Rutger Santen +7 more
TL;DR: In this paper, an FTIR analysis of adsorbed CO and acetonitrile reveals the presence of Lewis and Bronsted sites in both catalysts, and the results indicate that the remarkable activity of SZ and FMSZ is not caused by exceptionally strong acid sites, but by stabilization of the transition state complex at the surface.