Catalytic regeneration of chloroorganics-saturated activated carbon using hydrodechlorination

Journal Article · Sat Jan 01 04:00:00 EST 2000 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie990484b· OSTI ID:20014506

Matatov-Meytal, Y; Sheintuch, M

A new two-step catalytic process is suggested as viable means for exhaustive regeneration of spent granular activated carbon (AC) saturated with chloroorganic compounds: it incorporates hydrodechlorination (HDC) by hydrogen or by hydrazine followed by oxidation in air. Complete dechlorination of p-chlorophenol (4-CP) was achieved with hydrogen over an AC/Pd catalyst at temperatures in excess of 200 C. Complete recovery of the adsorption capacity was achieved in three tested cycles of adsorption of 4-CP and regeneration in batch and column studies. Pd is the most suitable catalyst for both HDC and oxidation steps, but the limiting factor of Pd is the possible oxidation of the carbon support and there is a need to increase the oxidation resistance of AC. Dechlorination of 4-CP with an equimolar solution sulfate and ammonium hydroxide is possible over AC/Pd, but the process is much slower.

• Research Organization: Technion-Israel Inst. of Tech., Haifa (IL)
• OSTI ID: 20014506
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 1 Vol. 39; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
ACTIVATED CARBON
AQUATIC ECOSYSTEMS
CATALYTIC EFFECTS
CHLORINATED AROMATIC HYDROCARBONS
DECHLORINATION
OXIDATION
PALLADIUM
REGENERATION
WASTE WATER
WATER TREATMENT