scholarly journals Adsorption Behavior of Sodium Hydrogen Sulfate on Silica Gel

2020 ◽  
pp. 38-46
Author(s):  
Jumei Xu ◽  
Zhongkai Jiang ◽  
Zuoxiang Zeng ◽  
Weilan Xue
Keyword(s):  
Silica Gel ◽  
Adsorption Behavior ◽  
Hydrogen Sulfate ◽  
Average Characteristic ◽  
Isotherm Equation ◽  
Physical Mechanisms ◽  
Sodium Hydrogen ◽  
Sodium Bisulfate ◽  
Different Temperatures ◽  
Characteristic Concentration

The adsorption behavior of sodium bisulfate on silica gel was studied. The adsorption isothem of sodium hydrogen sulfate on silica gel were measured in the temperature range of 298.15 ~ 328.15 K, and the Langmuir model and the Dubini-Radushkevich (D-R) model were used to fit the experimental isotherm data. The average characteristic concentration (Ce') of NaHSO4 was determined at different temperatures to distinguish chemisorption from physisorption. The values of the mean free energy (E) calculated from the D−R isotherm equation indicated that the adsorption of NaHSO4 on silica gel occurs by sequential chemical and physical mechanisms.

Silica Gel Supported Sodium Hydrogen Sulfate as an Efficient and Reusable Heterogeneous Catalyst for the Synthesis of Imines in Solvent-free Conditions under Microwave Irradiation

2005 ◽  
Vol 2005 (5) ◽  
pp. 299-303 ◽  
Author(s):  
Mannathusamy Gopalakrishnan ◽  
Purushothaman Sureshkumar ◽  
Vijayakumar Kanagarajan ◽  
Jeyaraman Thanusu ◽  
Ramalingam Govindaraju
Keyword(s):  
Microwave Irradiation ◽  
Heterogeneous Catalyst ◽  
Silica Gel ◽  
Diethyl Ether ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Hydrogen Sulfate ◽  
Sodium Hydrogen ◽  
Solvent Free Conditions

This synthesis of imines has been carried out efficiently by the condensation of carbonyl compounds with amines in the presence of silica gel supported sodium hydrogen sulfate (NaHSO4.SiO2) as a heterogeneous catalyst under microwave irradiation in solvent-free conditions. NaHSO4.SiO2 can be recovered and re-used up to ten times by simple washing with diethyl ether after each use and activated in an oven at 120 °C for 1 h, thus rendering the process more economical.

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