Palladium-catalyzed reductive dehalogenation of dissolved chlorinated aliphatics using electrolytically-generated hydrogen

被引：41

作者：

McNab, WW ^{[1
]}

Ruiz, R ^{[1
]}

机构：

[1] Sandia Natl Labs, Environm Restorat Div, Livermore, CA 94551 USA

来源：

CHEMOSPHERE | 1998年 / 37卷 / 05期

关键词：

D O I：

10.1016/S0045-6535(98)00095-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Recent studies have shown that reductive dehalogenation of chlorinated hydrocarbons by hydrogen occurs rapidly in the presence of a palladium catalyst. The speed and completeness of these reactions may offer advantages for groundwater remediation. A practical design challenge arises with the need to expeditiously saturate the aqueous phase with hydrogen. To address this, a two-stage treatment column (hydrogen generator and catalytic reactor) has been developed. The first stage consists of an undivided electrolyzer cell which generates hydrogen by electrolyzing the influent water. The second stage contains a catalyst bed of palladium metal supported on alumina beads. This reactor has been tested with groundwater containing various chlorinated aliphatics. Using a flow rate of 300 ml/min and a current of 4 amps under a potential of 8 volts, removal efficiencies greater than 95% were achieved for PCE, TCE, 1,1-DCE, and carbon tetrachloride with residence times on the order of 2 minutes. Chloroform and 1,2-DCA appear less susceptible to dehalogenation by this process. These results imply that dissolved oxygen present in solution does not completely inhibit reduction of the chlorinated hydrocarbons on the catalyst. (C)1998 Elsevier Science Ltd. All rights reserved.

引用

页码：925 / 936

页数：12

共 13 条

[1] SEQUENTIAL DEHALOGENATION OF CHLORINATED ETHENES [J].

BARRIOLAGE, G ;

PARSONS, FZ ;

NASSAR, RS ;

LORENZO, PA .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1986, 20 (01) :96-99

[2] ANAEROBIC DEGRADATION OF HALOGENATED 1-CARBON AND 2-CARBON ORGANIC-COMPOUNDS [J].

BOUWER, EJ ;

RITTMANN, BE ;

MCCARTY, PL .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1981, 15 (05) :596-599

[3]

*CRC, 1992, CRC HDB CHEM PHYS, P4

[4] ENHANCED DEGRADATION OF HALOGENATED ALIPHATICS BY ZERO-VALENT IRON [J].

GILLHAM, RW ;

OHANNESIN, SF .

GROUND WATER, 1994, 32 (06) :958-967

[5]

HAMPEL CA, 1964, ENCY ELECTROCHEMISTR, P869

[6]

Hudlicky M., 1984, REDUCTIONS ORGANIC C, P62

[7] Kinetics of halogenated organic compound degradation by iron metal [J].

Johnson, TL ;

Scherer, MM ;

Tratnyek, PG .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1996, 30 (08) :2634-2640

[8] Byproduct formation during the reduction of TCE by zero-valence iron and palladized iron [J].

Liang, LY ;

Korte, N ;

Goodlaxson, JD ;

Clausen, J ;

Fernando, Q ;

Muftikian, R .

GROUND WATER MONITORING AND REMEDIATION, 1997, 17 (01) :122-127

[9]

McCarty P. L., 1996, S NAT ATT CHLOR ORG, P5

[10]

MUNAKATA N, 1997, AM CHEM SOC DIVISION, V37, P168

← 1 2 →