Author
Vera Dondur
Other affiliations: Academy of Sciences of the Czech Republic, Fritz Haber Institute of the Max Planck Society
Bio: Vera Dondur is an academic researcher from University of Belgrade. The author has contributed to research in topics: Zeolite & Adsorption. The author has an hindex of 24, co-authored 93 publications receiving 2062 citations. Previous affiliations of Vera Dondur include Academy of Sciences of the Czech Republic & Fritz Haber Institute of the Max Planck Society.
Papers published on a yearly basis
Papers
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TL;DR: In this article, the acidity of dealuminated hydrogen mordenites (Si/Al = 12-39) is characterized by the temperature-programmed desorption of ammonia or pyridine which is monitored through a mass spectrometer.
Abstract: The acidity of dealuminated hydrogen mordenites (Si/Al = 12-39) is characterized by the temperature-programmed desorption of ammonia or pyridine which is monitored through a mass spectrometer. Four types of sites are indicated by ammonia desorption, viz., weak and strong sites of Broensted and Lewis type, whereas pyridine desorption reveals only the existence of three types of acidic sites which are tentatively assigned to one sort of Broensted site and weak and strong Lewis centers. Evaluation of the desorption spectra provides the temperatures of maximum rate of desorption, the population of the respective sites, the desorption rates as a function of the activation energies of desorption, and, finally, probability functions of the activation energies. The results are discussed in terms of coverage, Si/Al ratio, and accessibility.
198 citations
TL;DR: In this paper, the acidity of dealuminated hydrogen forms of Y-type zeolites (Si/Al = 2.4-8.6) is determined by temperature-programmed desorption of ammonia or pyridine, which is monitored through a mass spectrometer.
Abstract: The acidity of dealuminated hydrogen forms of Y-type zeolites (Si/Al = 2.4-8.6) is determined by temperature-programmed desorption of ammonia or pyridine, which is monitored through a mass spectrometer. Four types of acidic sites are indicated by ammonia, viz., weak Broensted and/or Lewis centers and medium and strong Broensted and strong Lewis sites. In contrast, pyridine, after sample activation at 675 K, probed only two types of sites, i.e., medium and strong Broensted sites. This difference is ascribed to different accessibility of sites for the two probe molecules. From the desorption spectra (i) the fractional coverage of the various sites, (ii) the most frequent energies of activation, {anti E}{sub d}, for desorption, and (iii) the probability functions of the activation energies are derived by using a previously described method of evaluation.
158 citations
TL;DR: P pH dependence of AFB1 adsorption, while AFB1 has the same form at all pHs, demonstrated that the surface modification of the zeolite depends on pH and that these modifications have influence on its adsor adaptation.
115 citations
TL;DR: In this article, the spectroscopic studies of polymorph transformation of framework silicates containing six-membered rings and different Si/Al ratio were carried out and two model systems with different stoichiometries were investigated.
97 citations
TL;DR: In this study an investigation of a model drug sorption onto cationic surfactant-modified natural zeolite composites as a drug formulation excipient revealed that that adsorption and partitioning of the model drug take place simultaneously.
87 citations
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Book•
01 Jan 1971
TL;DR: In this paper, Ozaki et al. describe the dynamics of adsorption and Oxidation of organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water.
Abstract: 1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.
1,870 citations
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TL;DR: Lipson and Steeple as mentioned in this paper interpreted X-ray powder diffraction patterns and found that powder-diffraction patterns can be represented by a set of 3-dimensional planes.
Abstract: Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.
1,867 citations
TL;DR: A review of the recent development of natural zeolites as adsorbents in water and wastewater treatment can be found in this paper, where the properties and modification of natural zerosite are discussed and the modified zerosites achieving higher adsorption capacity for organics and anions.
1,794 citations
TL;DR: This Review systematically documents the progresses and developments made in the understanding and design of heterogeneous catalysts for VOC oxidation over the past two decades and addresses in detail how catalytic performance is often drastically affected by the pollutant sources and reaction conditions.
Abstract: It is well known that urbanization and industrialization have resulted in the rapidly increasing emissions of volatile organic compounds (VOCs), which are a major contributor to the formation of secondary pollutants (e.g., tropospheric ozone, PAN (peroxyacetyl nitrate), and secondary organic aerosols) and photochemical smog. The emission of these pollutants has led to a large decline in air quality in numerous regions around the world, which has ultimately led to concerns regarding their impact on human health and general well-being. Catalytic oxidation is regarded as one of the most promising strategies for VOC removal from industrial waste streams. This Review systematically documents the progresses and developments made in the understanding and design of heterogeneous catalysts for VOC oxidation over the past two decades. It addresses in detail how catalytic performance is often drastically affected by the pollutant sources and reaction conditions. It also highlights the primary routes for catalyst deactivation and discusses protocols for their subsequent reactivation. Kinetic models and proposed oxidation mechanisms for representative VOCs are also provided. Typical catalytic reactors and oxidizers for industrial VOC destruction are further discussed. We believe that this Review will provide a great foundation and reference point for future design and development in this field.
1,074 citations
1,003 citations