Rapid hydrodehalogenation of chlorinated benzoic acids using mechano-thermally prepared Raney alloy with enhanced kinetics

Applicability of Nickel-Based Catalytic Systems for Hydrodehalogenation of Recalcitrant Halogenated Aromatic Compounds

“…At least (poly)halogenated anilines, (poly)chlorinated benzenes, (poly)chlorinated benzoic acids and polyhalogenated phenols are selectively reduced, however, to the corresponding nonhalogenated aromatic compounds at room temperature using a low excess of Al-Ni alloy in 1-2% aqueous NaOH or KOH solutions, as we observed [88,[91][92][93][94]98,103]. Under the same reaction conditions, chlorinated benzophenones are reduced to dicyclohexylmethane, benzylcyclohexane and diphenylmethane [96].…”

“…This alloy contains 50 wt% of Al and 50 wt% of Ni bound in the form of Al 3 Ni and Al 3 Ni 2 . Different bases such as NaOH or KOH [88][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104], alkali metal carbonates [89,94,95], NaF [100] or some alkaline salts of complexing agents [91,101] were proved for HDH processes. It was observed that Raney Al-Ni alloy is, especially in diluted aq.…”

“…It was observed that Raney Al-Ni alloy is, especially in diluted aq. NaOH or KOH, a very effective and universal HDH agent enabling quantitative HDH of Ar-Br, Ar-Cl compounds at elevated temperature [89,90,95,96,99,102,104] or even at room temperature [81][82][83][84][85][86][87][88][89][90][91][92][93][94]98,103].…”

“…In this context the hardly reducible compounds (4-chloroaniline, etc.) are not hydrogehalogenated even using Devarda's Al-Cu-Zn alloy [88,91] [88,98].…”

Rapid and effective removal of copper, nitrate and trichloromethane from aqueous media by aluminium alloys

“…Additionally, conventional bimetals are not uniform and are susceptible the detachment of the two metals which compromise their galvanic and catalytic effects [ 20 , [22] , [23] , [24] ]. Bimetallic alloys avoid these problems of conventional bimetals [ 25 ] and Al–Fe and Al–Ni alloys have been successfully used to remove heavy metals, nitrate and/or chlorinated organics from water [ 1 , 21 , 24 , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] ]. Notably, it was observed that the Al–Fe alloy exhibited high efficiency in converting nitrate, achieving a conversion rate from 10 to 60 % across a broad range from pH 2 to 12.…”