A highly active low Pd content catalyst synthesized by deposition–precipitation method for hydrodechlorination of chlorobenzene

Gopinath, Rajesh; Lingaiah, N.; Babu, N. Seshu; Suryanarayana, I.; Prasad, P. S. Sai; Obuchi, Akira

doi:10.1016/j.molcata.2003.09.046

Cited by 31 publications

(24 citation statements)

References 24 publications

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“…In parallel, Gopinath et al [19] reported the high stability of Pd/CeO 2 catalysts prepared using the deposition-precipitation method for catalytic HDC of chlorobenzene resulting from the strong interaction between metal and support. Similar results were also observed for catalytic HDC of chlorobenzene over Pd/ZrO 2 and Pd/Al 2 O 3 catalysts [20,21]. Recently, Vinod Kumar et al [22] and observed superior catalytic behavior for chlorobenzene HDC in terms of catalytic activity and stability.…”

Section: Introductionsupporting

confidence: 79%

Influence of ZrO2 properties on catalytic hydrodechlorination of chlorobenzene over Pd/ZrO2 catalysts

Shao

Wan

et al. 2010

Journal of Hazardous Materials

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Section: Introductionsupporting

confidence: 79%

Influence of ZrO2 properties on catalytic hydrodechlorination of chlorobenzene over Pd/ZrO2 catalysts

Shao

Wan

et al. 2010

Journal of Hazardous Materials

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“…Our study [49] showed that the chlorobenzene was about 80% over 15 wt% Ni/SiO 2 under the same reaction conditions. Noble metal catalysts, especially Pd, exhibit good gas-phase HDC activity under the more mild temperature (413-473 K), however, their deactivation also occurred, such as Pd/ZrO 2 [9], Pd/CeO 2 [64], Ln-Pd/SiO 2 (Ln = La, Ce, Sm, Eu, Gd and Yb) [65]. Figure 5 also shows that there was an induction period in HDC.…”

Section: Catalyst Activitymentioning

confidence: 98%

“…The catalysts used for HDC have mainly been monometallic (e.g. Pt [3][4][5], Pd [3,[6][7][8][9], Rh [10,11], Ni [12][13][14][15][16][17][18]) or bimetallic (e.g. Ni-Au [19], Pd-Ni [20], Pd-Au [21], Pd-Rh [22], Pd-Yb [23], Pd-Fe [24,25]); supported molybdenum carbide [26] and sulphided Ni-Mo/Al 2 O 3 [27] have also been used.…”

Section: Introductionmentioning

confidence: 99%

Gas-phase Hydrodechlorination of Chlorobenzene Over Silica-supported Ni2P Catalysts Prepared Under Different Reduction Conditions

et al. 2007

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The influence of reduction conditions on the properties and reactivity of silica-supported nickel phosphide (Ni 2 P/SiO 2 ) catalysts for gas-phase hydrodechlorination (HDC) of chlorobenzene was investigated. The catalysts prepared under different reduction conditions had the similar specific surface area (*370 m 2 g -1 ), and pore diameter (*5.2 nm) and Ni 2 P crystallites size (10-13 nm). However, comparing with Ni 2 P/SiO 2 catalyst prepared at 923 K with the H 2 space velocity of 15,000 mL g -1 h -1 for 2 h, with increasing the H 2 space velocity from 15,000 to 19,200 mL g -1 h -1 , or the reduction temperature from 923 to 1023 K or the reduction time from 2 to 6 h, the Ni/P ratio in the prepared catalyst was increased from 1/0.56 to about 1/0.50, and the HDC reaction induction period over the catalyst was also shortened from above 30 to 2-4 h. It is suggested that the induction period might be due to the blocking of active sites by excess phosphorus, which results in hindering the activation of chlorobenzene and the adsorption of hydrogen species on Ni 2 P. Under the conditions of 573 K and W Ni /F Cl = 186.6 g Ni mol À1Cl min, the chlorobenzene conversion over the Ni 2 P/SiO 2 catalyst reached 99%, and it did not change during 36 h. The good activity and stability of the Ni 2 P/SiO 2 catalyst was ascribed to the weak interaction between chlorine and Ni 2 P and a great of spilt-over hydrogen species on the catalyst surface.

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“…Comparison of the DP catalysts with those prepared by impregnation or coprecipitation revealed favorable performance of the former for the methanol synthesis. Gopinath et al [35] have prepared Pd/ZrO 2 catalysts by addition of Na 2 CO 3 solution to PdCl 2 (aq)/ZrO 2 suspension. The ∼1−nm Pd particles dispersed on ZrO 2 thus obtained performed favorably for the hydrodechlorination of chlorobenzene when compared to catalysts obtained via impregnation.…”

Section: Ph Increasementioning

confidence: 99%

Deposition Precipitation

Jong

2009

Synthesis of Solid Catalysts

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A highly active low Pd content catalyst synthesized by deposition–precipitation method for hydrodechlorination of chlorobenzene

Cited by 31 publications

References 24 publications

Influence of ZrO2 properties on catalytic hydrodechlorination of chlorobenzene over Pd/ZrO2 catalysts

Influence of ZrO2 properties on catalytic hydrodechlorination of chlorobenzene over Pd/ZrO2 catalysts

Gas-phase Hydrodechlorination of Chlorobenzene Over Silica-supported Ni2P Catalysts Prepared Under Different Reduction Conditions

Deposition Precipitation

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