Washed activated carbons

C. Palladium on carbon catalyst (5 per cent. Pd). Suspend 41-5 g. of nitric acid - washed activated carbon in 600 ml. of water in a 2-litre beaker and heat to 80°. Add a solution of 4 1 g. of anhydrous palladium chloride (1) in 10 ml. of concentrated hydrochloric acid and 25 ml. of water (prepared as in A), followed by 4 ml. of 37 per cent, formaldehyde solution. Stir the suspension mechanically, render it alkaUne to litmus with 30 per cent, sodium hydroxide solution and continue the stirring for a further 5 minutes. Filter off the catalyst on a Buchner funnel, wash it ten times with 125 ml. portions of water, and dry and store as in B. The yield is 46 g. 

A. Palladium chloride on carbon. Prepare a solution of 4-2 g. of anhj drous palladium chloride (1) in 10 ml. of concentrated hydrochloric acid and 26 ml. of water by heating on a boiling water bath for 2 hours or imtil solution is complete. Add 70 ml. of water and pour all the resulting solution over 46 g. of nitric acid - washed activated carbon (2) contained in an evaporating dish or Pyrex crystallising dish. Mix the palladium chloride solution thoroughly with the carbon, and dry the mixture first on a water bath and then in an oven at 100° stir occasionally. Powder the mass (49 g.) and store in a tightly-stoppered bottle. 

H2O2 treatment of the HNO3 washed activated carbon... 

NoritSX2 Steam activation, acid washed Activated carbons Greater than 100 mesh (1501%) N2(BET) SOOmVg Lagrange of applicadons requirmg high purides. 

Acid-washed wood-based activated carbon (WVBAW) showed significantly lower adsorption than the coal-based acid-washed activated carbon (F 400 AW) sample on both a mass and surface area basis over the entire concentration range. This indicated that the uptake of both TCE and TCB is not determined by the surface area alone. However, the size of the pores may also play an important role, because the coal-based activated carbon was found to have a considerably larger amount of... 

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