Catalytic Properties of Vanadium Nitrides

Jeong-Gil Choi; M.-K Jung

Journal of Industrial and Engineering Chemistry, Vol.3, No.2, 93-98, June, 1997

Department of Chemical Engineering, Hannam University, Taejon 300-791, Korea

Vanadium nitrides were synthesized by the temperature-programmed reaction of vanadium oxide (V₂O₅) with pure NH₃. After the nitridation of vanadium oxides the resulting materials contained VN or a VN with a trace of V₂O₃ in the bulk, indicating that the structural properties of these materials were strong functions of the heating rate and space velocity employed. It was observed that the vanadium nitrides were active for NH₃ decomposition. Since the activity varied with changes in the surface area and particle size, ammonia decomposition over the vanadium nitrides appeared to be structure-sensitive. We believe that these responses were associated with the grain boundary length. The most active catalyst of VN-3 with the δ-phase had the greatest grain boundary length. The catalytic properties of vanadium nitrides were comparable or superior to those of Pt/C and Ni/SiO₂ · Al₂O₃ catalysts, suggesting that the characteristics of active sites in the vanadium nitrides were similar to those in the Group 8-10 metal-based catalysts.

[References]

Sajkowski DJ, Oyama ST, Prep. Petrol. Chem. Div., 199th ACS Nat. Meeting, 212 (1990)
Choi J, Brenner JR, Colling CW, Demczyk BG, Dunning J, Thompson LT, Catal. Today, 15, 201 (1992)
Leclercq L, Imura K, Yoshida S, Barbee T, Boudart M, "Preparation of Catalysts II," (B. Delmon, Ed.), 627, Elsevier, NY (1978)
Volpe L, Boudart M, J. Phys. Chem., 90, 4874 (1986)
Leclercq L, Provost M, Pastor H, Grimblot J, Hardy AM, Gengembre L, Leclercq G, J. Catal., 117, 371 (1989)
Levy RB, Boudart M, Science, 181, 547 (1973)
Sinfelt JH, Yates DJC, Nature Phys. Sci., 229, 27 (1971)
Oyama ST, J. Catal., 133, 358 (1992)
Lee KS, Abe H, Reimer JA, Bell AT, J. Catal., 139, 34 (1993)
Gates BC, Katzer JR, Schuit GCA, "Chemistry of Catalytic Processes," McGraw-Hill, New York (1979)
Cullity BD, "Elements of X-ray Diffraction," Addison-Wesley Publishing Co., Massachusetts (1978)
Choi JG, Curl RL, Thompson LT, J. Catal., 146(1), 218 (1994)
Curry KE, Thompson LT, Catal. Today, 21, 171 (1994)
Choi JG, Brenner JR, Thompson LT, J. Catal., 154(1), 33 (1995)
Volpe L, Boudart M, "Preparation of Catalysts III," (G. Poncelet, P. Grange, and P.A. Jacobs, Eds.), 147, Elsevier, New York (1983)

[Referenced By]

[1] Sajkowski DJ, Oyama ST, Prep. Petrol. Chem. Div., 199th ACS Nat. Meeting, 212 (1990)

[2] Choi J, Brenner JR, Colling CW, Demczyk BG, Dunning J, Thompson LT, Catal. Today, 15, 201 (1992)

[3] Leclercq L, Imura K, Yoshida S, Barbee T, Boudart M, "Preparation of Catalysts II," (B. Delmon, Ed.), 627, Elsevier, NY (1978)

[4] Volpe L, Boudart M, J. Phys. Chem., 90, 4874 (1986)

[5] Leclercq L, Provost M, Pastor H, Grimblot J, Hardy AM, Gengembre L, Leclercq G, J. Catal., 117, 371 (1989)

[6] Levy RB, Boudart M, Science, 181, 547 (1973)

[7] Sinfelt JH, Yates DJC, Nature Phys. Sci., 229, 27 (1971)

[8] Oyama ST, J. Catal., 133, 358 (1992)

[9] Lee KS, Abe H, Reimer JA, Bell AT, J. Catal., 139, 34 (1993)

[10] Gates BC, Katzer JR, Schuit GCA, "Chemistry of Catalytic Processes," McGraw-Hill, New York (1979)

[11] Cullity BD, "Elements of X-ray Diffraction," Addison-Wesley Publishing Co., Massachusetts (1978)

[12] Choi JG, Curl RL, Thompson LT, J. Catal., 146(1), 218 (1994)

[13] Curry KE, Thompson LT, Catal. Today, 21, 171 (1994)

[14] Choi JG, Brenner JR, Thompson LT, J. Catal., 154(1), 33 (1995)

[15] Volpe L, Boudart M, "Preparation of Catalysts III," (G. Poncelet, P. Grange, and P.A. Jacobs, Eds.), 147, Elsevier, New York (1983)