نتایج جستجو برای: basicity

تعداد نتایج: 1286  

Journal: :Chemical communications 2014
Lin-Bing Sun Xiao-Yan Liu Ai-Guo Li Xiao-Dan Liu Xiao-Qin Liu

Template-derived carbon is demonstrated to effectively promote the creation of strong basicity on mesoporous silica, for the first time. New materials owning ordered mesoporous structure, strong basicity, and excellent catalytic activity are thus successfully constructed at low temperatures, which are impossible to achieve using conventional methods.

A generalization of Schauder basis associated with the concept of generalized analytic functions is introduced. Corresponding concepts of density, completeness, biorthogonality and basicity are defined. Also, corresponding concept of the space of coefficients is introduced. Under certain conditions for the  corresponding operators, some properties of the space of coefficients and basicity crite...

2016
Na Li Yi Hu Yong-Ze Lu Raymond J. Zeng Guo-Ping Sheng

To meet the high quality standard of receiving water, the coagulation process using polyferric chloride (PFC) was used to further improve the water quality of effluent from wastewater treatment plants. Uniform design (UD) coupled with response surface methodology (RSM) was adopted to assess the effects of the main influence factors: coagulant dosage, pH and basicity, on the removal of total org...

2011
S. Sugunan

The electron donating properties, surface acidity/basicity and catalytic activity of lanthana for various dopaut concentrations of strontium are reported at two activation temperatures. The catalytic activity has been correlated with electron donating properties and surface acidity/basicity of the oxide.

2017
Masaoki Kimura Yoshihiko Matsui Kenta Kondo Tairyo B. Ishikawa Taku Matsushita Nobutaka Shirasaki

24 Aluminum coagulants are widely used in water treatment plants to remove turbidity and 25 dissolved substances. However, because high aluminum concentrations in treated water are 26 associated with increased turbidity and because aluminum exerts undeniable human health 27 effects, its concentration should be controlled in water treatment plants, especially in plants 28 that use aluminum coagu...

Journal: :Journal of the Japan Welding Society 1981

Journal: :The Journal of organic chemistry 2008
Thomas P Wells Jason P Hallett Charlotte K Williams Tom Welton

The second-order rate constant (k2) for the esterification of methoxyacetic acid with benzyl alcohol is reported in a range of ionic and molecular solvents. The solvent effects on esterification rate are examined by using a linear solvation energy relationship based on the Kamlet-Taft solvent scales (alpha, beta, and pi*). It is shown that the hydrogen bond basicity of the solvent is the domina...

Journal: :Physical chemistry chemical physics : PCCP 2015
Weihong Wu Yunxiang Lu Hairong Ding Changjun Peng Honglai Liu

Metal-containing ionic liquids (ILs) have been recognized as potential solvents, catalysts, catalyst precursors and reagents for many organic processes. In this work, several quantum-chemical parameters, including the surface electrostatic potential (Vs,max and Vs,min), the lowest surface average local ionization energy (I̅s,min), and the electrostatic potential at the position of an atom (EPnuc...

Journal: :Journal of chemical information and modeling 2012
Se-Han Lee Kwang-Hwi Cho William E. Acree Kyoung Tai No

We developed surface grid-based solvation free energy density (Surface-SFED) models for 36 commonly used polar solvents. The parametrization was performed with a large and diverse set of experimental solvation free energies mainly consisting of combinations of polar solvent and multipolar solute. Therefore, the contribution of hydrogen bonds was dominant in the model. In order to increase the a...

Journal: :The journal of physical chemistry. B 2014
Andrea Cerda-Monje Rodrigo Ormazábal-Toledo Carlos Cárdenas Patricio Fuentealba Renato Contreras

The origin of catalysis and selectivity induced by room temperature ionic liquids in several organic reactions has putatively been associated with the concept of cation effect (hydrogen bond donor ability of the ionic liquids) or anion effect (hydrogen bond accepting ability of the ionic liquids). We show that there may be cases where this a priori classification may not be correctly assigned. ...

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