Effectiveness and stability of commercial Pd/C catalysts in the hydrodechlorination of meta-substituted chlorobenzenes

Effect of metal precursor and pretreatment conditions on the catalytic activity of Ni/C in the aqueous phase hydrodechlorination of 1,1,2-trichloroethene

“…This phenomenon is in agreement with earlier studies for noble metals in the hydrodechlorination [27,28,29]. This sensitivity is often explained by the higher resistance to deactivation observed for the large metal particles and/or the differences in the hydrogen adsorption mechanisms for the different metal crystallite size.…”

“…However, it is not always clear. Zhou et al [29] postulated the volcano type of the relationship between the hydrodechlorination activity and metal particles size. On the other hand, recently published results of the aqueous phase hydrodechlorination of chloroorganic compounds indicate the beneficial role of the small metal particles on overall activity of the metallic catalysts [26,30,31].…”

Effect of size and oxidation state of size-controlled rhodium nanoparticles on the aqueous-phase hydrodechlorination of 4-chlorophenol

“…A number of authors have reported that HDC is a structure-sensitive reaction [14][15][16], but there is no general agreement on this point [17]. In general, it is accepted that a higher surface-to-volume ratio, associated to a lower nanoparticle size of the active phase, increases the catalytic activity, although some limit has been reported for this effect [16,18].…”

Catalytic removal of trichloroethylene from water over palladium loaded microporous and hierarchical zeolites

“…It has been stated that an increase of the particles size leads to increase of HDC rate, both in gas and in liquid phase [48][49][50][51]. Authors explain this phenomenon by their higher resistance toHCl, however Janiaket al [52] showed that larger palladium particles are more susceptible to leaching. Carbon materials due to their high adsorption capacity for organic compounds and high stability under the aggressive conditions of the reaction play very important role as the supports for active phase in purification of water from chloroorganic compounds [51].…”

“…Recent works of Dong et al [55,56] concerning aqueous phase hydrodechlorination of 4-chlorophenol on Au and Pd nanoparticles supported on magnetic porous carbon (MPC) composite [55], and novel fibrous nano-silica based Ni@Pd core-shell nanoparticles [56] also showed beneficial role of excellent dispersed metallic phase in efficient hydrodechlorination of chloroorganic compounds. Moreover, application these new, unconventional supports prevents agglomeration of active phase, its deactivation and leaching [49][50][51][52][53][54][55].Aramendia et al [49], studying bromobenzenehydrodebromination, suggested significant role of the electronic factors in overall activity considering small Pd clusters more electro-deficient than large crystallites. Gómez-Quero et al [57] pointed out the smallest particles (lower than 5 nm) as the most active in the hydrodechlorination of 2,4-dichlorophenol on Pd/Al 2 O 3 catalyst.…”