Synthesis and characterization of Pd–ZSM-23 with Na and H form for catalytic hydrodehalogenation of bromobenzene

Facile synthesis of palladium nanoparticles encapsulated in amine-functionalized mesoporous metal–organic frameworks and catalytic for dehalogenation of aryl chlorides

“…Most polychlorinated benzenes are priority pollutants [2]. Interestingly, water is used as solvent, and the dichlorobenzene derivatives (1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, 2,4-dichlorophenol) and trichlorobenzene derivatives (1,2,4-trichlorobenzene and 2,4,6-trichlorophenol), which are not soluble in water, can be dehalogenated completely with high activity in only 8 h (entries [17][18][19][20][21][22]. Interesting, there was no chlorobenzene or chlorobenzene derivatives.…”

“…In contrast, heterogeneous palladium catalysts have been proven to be promising alternatives for avoiding these problems [9]. Various materials, such as Al 2 O 3 [21], carbon structures [9,14,20,22,25,26], polymers [16,17], mesoporous silica [1,24], zeolites [19], magnetic materials [15], and ionic liquids [18], have been employed as supports for palladium catalysts. Compared with other heterogeneous catalysts, palladium nanoparticles encapsulated in cages are stable and cannot agglomerate to the bulk because the cages can confine metal nanoparticles and restrict their growth.…”

“…Therefore, great efforts have been devoted to developing methods for dehalogenating aryl halides, which leads to a drastic decrease in toxicity [6][7][8]. Generally, there are several methods for solving the problem [9]: the available techniques mainly include wet catalytic oxidation [10,11], photochemical treatment [12], and palladium [1,[4][5][6][7][8][9][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] catalytic hydrogenation. Recently, an operationally simple iron-catalyzed hydrodehalogenation of aryl halides has also been developed [29][30][31][32].…”

Solvent effects in the catalytic hydrotreament of haloaromatics over Pd/Al2O3 in water+organic mixtures

“…The scission of C-Cl (Aramendía et al, 1999a;Coq et al, 1986Coq et al, , 1995Díaz et al, 2008;Kim et al, 2008;Zinovyev et al, 2004;Zinovyev et al, 2005) and C-Br (Aramendía et al, 1999b;Fakhfakh et al, 2001;Liu et al, 2006;Wang et al, 2007;Yang et al, 2008) bonds has now been promoted using Fe (Fakhfakh et al, 2001;Kim et al, 2008), Ni Zinovyev et al, 2005), Pt (Díaz et al, 2008;Wang et al, 2007) and Pd (Aramendia et al, 1999a, b;Coq et al, 1986Coq et al, , 1995Yang et al, 2008;Zinovyev et al, 2004) catalysts, where the latter has been demonstrated to be the most efficient in terms of specific rate and resistance to deactivation (Centi, 2001;Urbano and Marinas, 2001). It is established that catalytic HDH is influenced by the chemistry of the catalyst support (Coq et al, 1995;Wang et al, 2007;Yuan and Keane, 2003a), metal dispersion (Aramendía et al, 1999b;Coq et al, 1986;Gó mezSainero et al, 2002) and use of additives (Evdokimova et al, 2004;Liu et al, 2006).…”

Environmental Catalysis over Zeolites

“…Pd/zeolite, in comparison with other Pd-based catalysts, may have the advantage of better hydrophobicity (in high Si/Al materials), and this could be an advantage for a higher stability against ionic poisons. An example is the use of Pd-ZSM-23 (1 wt% Pd) for catalytic hydrodehalogenation of bromobenzene [126]. The activity is good as well as the recyclability, but there is no cost effectiveness in using these catalysts.…”