The Role of Nickel in Pyridine Hydrodenitrogenation over NiMo/Al2O3

Park YC; Rhee HK

Korean Journal of Chemical Engineering, Vol.15, No.4, 411-416, July, 1998

Al₂O₃ supported Mo, Ni, and NiMo/Al₂O₃ catalysts with various Ni contents were prepared to investigate the role of Ni as a promoter in a NiMo bimetallic catalyst system. The hydrodenitrogenation (HDN) reaction of pyridine as a catalytic probe was conducted over these catalysts under the same reaction conditions and the catalysts were characterized using BET surface area measurement, infrared spectroscopy, temperature programmed reduction, DRS and ESR. According to the results of reaction experiments, the NiMo/Al₂O₃ catalyst showed higher activity than Mo/Al₂O₃ catalyst in the HDN reaction and particularly the one with atomic ratio [Ni/(Ni+Mo)]=0.3 showed the best activity for the HDN of pyridine. The findings of this study lead us to suggest that the enhancement in the HDN activity with nickel addition could be attributed to the improvement in the reducibility of molybdenum and the formation of Ni-Mo-O phase.

Keywords:Nickel;Pyridine HDN;Reducibility;Ni-Mo-O;NiMo/Al₂O₃

[References]

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Dufresne P, Payen E, Grimblot J, Bonnelle JP, J. Phys. Chem., 85, 2344 (1981)
Iannibello A, Mitchell PCH, "Preparative Chemistry of Cobalt-Molybdenum/Alumina Catalysts. In Preparation of Catalysts II: Delmon, P., Grange, P., Jacobs P. and Poncelet, G., Eds, Elsevier, Amsterdam, The Netherlands, Vol. 3, pp. 469 (1979)
Jocomo ML, J. Phys. Chem., 75, 1034 (1971)
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Konings AJA, Brentjens WLJ, Koningsberger DC, de Beer VHJ, J. Catal., 67, 145 (1981)
Ledoux MJ, Bouassida A, Benazouz R, Appl. Catal., 9, 41 (1984)
Ledoux MJ, Pjellouli B, Appl. Catal., 67, 81 (1990)
Louwers SPA, Prins R, J. Catal., 133, 94 (1992)
Moon SJ, Jeon GS, Ihm SK, HWAHAK KONGHAK, 26(6), 617 (1988)
Uzkan US, Zhang LP, Ni SY, Moctezuma E, J. Catal., 148(1), 181 (1994)
Ramirez J, Cuevas R, Gasque L, Vrinat M, Breysse M, Appl. Catal., 71, 351 (1991)
Silbernagel BG, Pecorara TA, Chianelli RR, J. Catal., 78, 380 (1978)
Sobczak J, Vit Z, Zdrazil M, Appl. Catal., 45, L23 (1988)
Stanislaus A, Absi-Halabi M, Al-Dolama K, Appl. Catal., 50, 237 (1989)
Thakur DS, Delmon B, J. Catal., 91, 308 (1985)
Thomas R, vanOers EM, de Beer VHJ, Medema J, Moulijn JA, J. Catal., 76, 241 (1982)
Thomas R, vanOders EM, DeBeer VHJ, Moulijn JA, J. Catal., 84, 275 (1983)
Yang H, Satterfield CN, J. Catal., 81, 168 (1983)

[Referenced By]

[1] Brito JL, Laine J, J. Catal., 139, 540 (1993)

[2] Derouane EG, Pedersen E, Clauen BS, Gabelica Z, Canidia R, Topsoe H, J. Catal., 99, 253 (1986)

[3] Dufresne P, Payen E, Grimblot J, Bonnelle JP, J. Phys. Chem., 85, 2344 (1981)

[4] Iannibello A, Mitchell PCH, "Preparative Chemistry of Cobalt-Molybdenum/Alumina Catalysts. In Preparation of Catalysts II: Delmon, P., Grange, P., Jacobs P. and Poncelet, G., Eds, Elsevier, Amsterdam, The Netherlands, Vol. 3, pp. 469 (1979)

[5] Jocomo ML, J. Phys. Chem., 75, 1034 (1971)

[6] Konings AJA, van Dooren AN, Koningsberger DC, deBeer VHJ, Farragher AL, Schuit GCA, J. Catal., 54, 1 (1978)

[7] Konings AJA, Brentjens WLJ, Koningsberger DC, de Beer VHJ, J. Catal., 67, 145 (1981)

[8] Ledoux MJ, Bouassida A, Benazouz R, Appl. Catal., 9, 41 (1984)

[9] Ledoux MJ, Pjellouli B, Appl. Catal., 67, 81 (1990)

[10] Louwers SPA, Prins R, J. Catal., 133, 94 (1992)

[11] Moon SJ, Jeon GS, Ihm SK, HWAHAK KONGHAK, 26(6), 617 (1988)

[12] Uzkan US, Zhang LP, Ni SY, Moctezuma E, J. Catal., 148(1), 181 (1994)

[13] Ramirez J, Cuevas R, Gasque L, Vrinat M, Breysse M, Appl. Catal., 71, 351 (1991)

[14] Silbernagel BG, Pecorara TA, Chianelli RR, J. Catal., 78, 380 (1978)

[15] Sobczak J, Vit Z, Zdrazil M, Appl. Catal., 45, L23 (1988)

[16] Stanislaus A, Absi-Halabi M, Al-Dolama K, Appl. Catal., 50, 237 (1989)

[17] Thakur DS, Delmon B, J. Catal., 91, 308 (1985)

[18] Thomas R, vanOers EM, de Beer VHJ, Medema J, Moulijn JA, J. Catal., 76, 241 (1982)

[19] Thomas R, vanOders EM, DeBeer VHJ, Moulijn JA, J. Catal., 84, 275 (1983)

[20] Yang H, Satterfield CN, J. Catal., 81, 168 (1983)