Abstract
A progressive sintering of the porosity of both V-free and V-loaded AlPO4-5 samples is observed upon calcination in air at increasing temperatures. This sintering leads to the coexistence of porous AlPO4-5 and dense tridymite. As established by cristallinity and pore volume measurements. the presence of vanadium decreases by 100 to 300°C the threshold temperature at which this sintering begins, in spite of the low V amount in the samples (V/(V+Al+P) atomic ratio of 0.5–1%). This threshold temperature depends on the method used to introduce V (by hydrothermal synthesis, under static conditions or agitation, and/or by grinding vanadia with a V-free AlPO4-5) and on the morphology of the AlPO4-5 crystals as observed by scanning electron microscopy. These factors are related to the dispersion of the V species within the porosity. Since only very small amounts of intraporosity VIV species (VIV/VT<1%) are detected by ESR, whatever the extent of the Sintering which generates tridymite, it is concluded that the thermal stability of V-loaded AlPO4-5 is determined by the dispersion of Vv species within the porosity. This conclusion is in line with earlier propositions made to explain the thermal behaviour of V-loaded zeolites and V-contamined FCC catalysts.
Similar content being viewed by others
References
H. Chon, S.I. Woo, and S.E. Park, Stud. Surf. Sci. Catal. 102, 267 (1996).
K.R. Reddy, A.V. Ramaswamy, and P. Ratmasamy, J. Catal. 5, 161 (1995).
G. Centi and F. Trifiro, Appl. Catal. A: General 143, 3 (1996).
G. Centi, F. Fazzini, L. Canesson, and A. Tuel, Stud. Surf. Sci. Catal. 112, 893 (1997).
J. Kornatowski, B. Witcherlova, J. Jirkovsky, E. Loffler, and W. Pilz, J. Chem. Soc., Faraday Trans. 92, 1067 (1996). (b) T. Sen, P.R. Rajamohanan, S. Ganapathy, and S. Sivasanker, J. Catal. 163, 354 (1996). (c) G. Centi, S. Perathoner, F. Trifiro, A. Aboukais, C.F. Aissi, and M. Guelton, J. Phys. Chem. 96, 2617 (1992).
T. Sen, V. Ramaswamy, S. Ganapathy, and P.R. Rajamohanan, J. Phys. Chem. 100, 3809 (1996). (b) P.R. Hari Prasad Rao. A.V. Ramaswamy, and P. Ratnasamy, J. Catal. 93, 123 (1993).
S.H. Chien, J.C. Ho, and S.S. Mon, Zeolites 18, 182 (1997). (b) S. Dzwigaj, M.J. Peltre, P. Massiani, A. Davidson, M. Che, T. Sen, and S. Sivasanker, J. Chem. Soc., Chem. Commun., 87 (1997).
B.I. Whittington and J.R. Andersson, J. Phys. Chem. 97, 1032 (1993). (b) B.I. Whittington and J.R. Andersson, J. Phys. Chem. 95, 3306 (1991).
I.L. Moudrakovski, A. Sayari, C.I. Ratcliffe, J.A. Ripmeester, and K.F. Preston, J. Phys. Chem. 98, 10895 (1994). (b) K.M. Reddy, I. Moudrakovski, and A. Sayari, J. Chem. Soc., Chem. Commun., 1491 (1994).
M. Chatterjee, D. Bhattacharya, N. Venkatathri, and S. Sivasanker, Catal. Lett. 35 313 (1995).
J. Kornatowski, M. Sychev, W.H. Baur, and G. Finger, Collect. Czech. Chem. Commun. 57, 767 (1992).
A. Miyamoto, Y. Iwamoto, H. Matsuda, and T. Inui, Stud. Surf. Sci. Catal. 49B, 1235 (1989).
M.S. Rigutto and H. van Bekkum, J. Mol. Catal. 81, 77 (1993).
S.H. Jhung, Y.S. Uh, and H. Chon, Appl. Catal. 62, 61 (1990).
M.K. Song, Y.H. Yeom, S.J. Kim, and Y.S. Uh, Appl. Catal. A: General 102, 93 (1993).
C. Montes, M.E. Davis, B. Murray, and M. Narayana, J. Phys. Chem. 94, 6431 (1990).
J.M. Lopes, F. Lemos, F. Ramoa Ribeiro, and E.G. Derouane, Appl. Catal. A: General 119, 139 (1994).
S.B. Hong, B.W. Hwang, Y.H. Yeom, S.J. Kim, and Y.S. Uh, Stud. Surf. Sci. Catal. 60, 179 (1991).
B.M. Weckhuysen, I.P. Vannijvel, and R.A. Schoonheydt, Zeolites 15, 482 (1995).
T. Blasco, P. Conception, J.M. Lopez Nieto, and J. Perez-Pariente, J. Catal. 152, 1 (1995); (b) P. Conception, J.M. Lopez Nieto, and J. Perez-Pariente, Catal. Lett. 19, 333 (1993).
N. Venkatathri, S.G. Hedge, and S. Sivasanker, J. Chem. Soc., Chem. Commun., 151 (1995). (a) M.L. Occelli, Catal. Rev. Sci. Eng. 33, 241 (1991); (b) U. Alkemade and S. Paloumbis, Stud. Surf. Sci. Catal. 100, 339 (1990). (c) M. Torrealba, M.R. Goldwasser, G. Perot, and M. Guisnet, Appl. Catal. A.: General 90, 35 (1992). (d) S.J. Yang and Y.W. Chen, Ind. Eng. Chem. Res. 34, 1126 (1995). (e) P.G. Menon, Appl. Catal. A: General 3, 122 (1995). (f) R.F. Wormbecher, A. Peters, and J.M. Maselli, J. Catal. 100, 130 (1986).
L.A. Pine, J. Catal. 125, 514 (1990). (b) W.P. Hettinger, H.W. Beck, E.B. Cornelius, P.K. Doolin, R.A. Kmecak, and S.M. Kovack, Amer. Chem. Soc., Div. Pet. Chem. 28, 920 (1983).
L.H. Lin, K.J. Chao, Y.C. Ling, J.F. Hwang, and L.Y. Hou, J. Chin. Chem. Soc. 44, 553 (1997), (b) J.S. Yoo, J.A. Karch, and E.H. Burk, Ind. Eng. Chem. Prod. Res. Dev. 25, 449 (1986).
S.T. Wilson, B.M. Lok, C.A. Messina, T.R. Cunan, and E.M. Flanigen, J. Am. Chem. Soc. 104, 1146 (1982) & Am. Chem. Soc. Symp. Ser. 218, 79 (1983).
V.R. Choudahary, D.B. Akolekar, A.P. Singh, and S.D. Sansare, J. Catal. 111, 254 (1988).
E.G. Derouane, J.G. Fripiat, and R. von Ballmoos, J. Phys. Chem. 94, 1687 (1990).
C. Jia, P. Massiani, and D. Barthomeuf, J. Chem. Soc., Faraday Trans. 89, 3659 (1993).
A. Davidson and M. Che, J. Phys. Chem. 96, 9909 (1992).
A.V. Kucherov and A.A. Slinkin, Zeolites 7, 583 (1987).
C.E. Sass, X. Chen, and L. Kevan, J. Chem. Soc., Faraday Trans. 86, 189 (1990).
F. Guth, Doctorat ès Sciences, Université de Mulhouse, France, 1989.
A. Corma, Chem. Rev. 97, 2373 (1997).
El M. El Malki, A. Davidson, P. Massiani, D. Barthomeuf, and M. Che, Advanced Techniques in Catalysts Preparation, preprints ACS meeting April 2–7, Anaheim 1995, p. 114; (b) El M. El Malki, A. Davidson, P. Massiani, D. Barthomeuf, and M. Che (unpublished results).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rao, H.P., Zanjanchi, M.A., Massiani, P. et al. Thermal stability of V-loaded AlPO4-5 materials. Res. Chem. Intermed. 25, 57–75 (1999). https://doi.org/10.1163/156856799X00383
Received:
Issue Date:
DOI: https://doi.org/10.1163/156856799X00383