Studies on the structure of a vanadium catalyst by measuring the low-temperature adsorption of sulphur dioxide

1968 ◽  
Vol 33 (9) ◽  
pp. 2807-2813
Author(s):  
J. Hodek ◽  
M. Zábranský ◽  
J. Vosolsobě
Keyword(s):  
Low Temperature ◽  
Sulphur Dioxide ◽  
Vanadium Catalyst

scholarly journals Coal-Based Activated Carbons for the Removal of Sulphur Dioxide via Adsorption

1997 ◽  
Vol 15 (10) ◽  
pp. 803-814 ◽  
Author(s):  
A.M. Youssef ◽  
M.R. Mostafa ◽  
E.M. Dorgham
Keyword(s):  
Activated Carbon ◽  
Low Temperature ◽  
Zinc Chloride ◽  
Sulphur Dioxide ◽  
Activated Carbons ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Carbon Surface ◽  
Steam Activation ◽  
Pore Widening

Zinc chloride-activated carbons and steam-activated carbons were prepared from Maghara coal. The textural properties were determined from low-temperature nitrogen adsorption. Zinc chloride activation is usually associated with the creation of new micropores while steam activation involves pore widening particularly when the percentage burn-off is high. The adsorption of SO2 on steam-activated carbon is high compared with ZnCl2-activated carbons. Steam activation develops surface basic groups which provide chemisorption sites for SO2. The adsorption of SO2 is enhanced in the presence of O2 and water vapour and involves the formation of sulphuric acid in this case. Sulphur dioxide adsorption is related to the chemistry of the carbon surface rather than to the extent of the surface area of the activated carbon.

INVESTIGATION OF VARIOUS PHYSICO-CHEMICAL FACTORS WHICH INFLUENCE SULPHITE COOKING

1934 ◽  
Vol 10 (1) ◽  
pp. 24-35 ◽  
Author(s):  
H. H. Saunderson ◽  
O. Maass
Keyword(s):  
Low Temperature ◽  
Sulphur Dioxide ◽  
Spruce Wood ◽  
Physico Chemical ◽  
Free Sulphur ◽  
Chemical Factors

The penetration of aqueous sulphite solutions into differently shaped blocks of spruce wood has been investigated, the effect of the shape and type of wood, and of the presence of imprisoned air being determined. Measurements of the rates of diffusion of the constituents of calcium bisulphite solutions into pre-soaked blocks of wood showed that "free" sulphur dioxide diffused more readily than calcium bisulphite. Adsorption of sulphur dioxide and calcium bisulphite solutions by spruce wood was measured at 30° and 50 °C., and the influence of this factor on penetration was determined. The effect of penetration on delignification indicated the necessity of a satisfactory distribution of the lime salt at a low temperature to avoid localization of the lime during the pulping process.

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