Jia Pei Ghoy and Eng-Poh Ng*
School of Chemical Sciences, UniversitiSains Malaysia, 11800 USM, Penang, Malaysia
The incorporation of other metal and non-metal cations into thealuminophosphate (MeAlPO-n) molecular sieves has played a major role in enhancing their applications in the field of adsorption, separation, the formation of host-guest advanced materials and catalysis. These materials are usually synthesized under hydrothermal condition. Recently, the ionothermal method has been reported as a green synthesis approach for the synthesis of aluminophosphate (AlPO-n) and metalloaluminophosphate (MeAlPO-n) materials by using non-volatile ionic liquids as a solvent and a structure directing agent. In this work, ionothermal synthesis of metastable metal-incorporated aluminophosphite NKX-2 (MeNKX-2), where Me = Zr, Cr, Co and Fe) using 1-benzyl-2,3-dimethylimidazolium chloride, [bdmim]Cl new ionic liquid was reported. The ionic liquid was first prepared and characterized before use for the synthesis of molecular sieves. The synthesized MeNKX-2 series were then characterized by X-ray diffraction, Fourier transforminfrared spectroscopy, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy and ultraviolet-visible spectroscopy. The analyses revealed that MeNKX-2 could be synthesized in a fast and convenient way and the crystals with unique morphology could be obtained within 20 min instead of several days under hydrothermal condition.Key words: Metal-incorporated NKX-2; ionic liquid; ionothermal synthesis; microporous materials; zeolites
Wilson, S.T., Lok, B.M., Messina, C.A., Cannan, T. R. and Flanigen, E. M. (1982) Aluminophosphate molecular sieves: a new class of microporous crystalline inorganic solids, J. Am. Chem. Soc., 104, 1146-1147.
Khoo, D.Y., Awala, H., Mintova, S. and Ng, E.-P. (2014) Synthesis of AlPO-5 with diol-substituted imidazoliumbased organic template, Micropor. Mesopor. Mater., 194, 200-207.
Gopal, L., Lim, G.K., Ling, T.C., Adnan, R., Juan, J. C. and Ng, E.-P. (2016) Organotemplate-free hydrothermal synthesis of NaNKX-2 aluminophosphite basic catalyst, Mater. Lett., 182, 344-346.
Cooper, E.R., Andrews, C.D., Wheatley, P.S., Webb, P.B., Wormald, P. and Morris, R.E. (2004) Ionic liquids and eutectic mixtures as solvent and template in synthesis of zeolite analogues, Nature, 430, 1012-1016.
Ma, H., Tian, Z., Xu, R., Wang, B., Wei, Y., Wang, L. Xu, Y., Zhang, W. and Lin, L. (2008) Effect of water on the ionothermal synthesis of molecular sieves, J. Am. Chem. Soc., 130, 8120-8121.
Pei R., Tian Z., Wei Y., Li K., Xu Y. and Wang L. (2010) Ionothermal synthesis of AlPO4 molecular sieves in the presence of quaternary ammonium cation, Mater. Lett., 64, 2118-2121.
Pei R., Tian Z., Wei Y., Li K., Xu Y. and Wang L. (2010) Ionothermal synthesis of AlPO4-34 molecular sieves using heterocyclic aromatic amine as the structure directing agent, Mater. Lett., 64, 2384-2387.
Chen, H., Chao, R., Na,B., Li, N., Xiang, S. and Guan, N. (2007) Effects of H2O2 and H3PO4 on synthesis of SAPO-41 and alPO-41 molecular sieves using H3PO3 as the phosphorus source, Chin. J. Catal., 28, 501-503.
Ren X. -T., Li N., Cao J. -Q., Wang Z. -Y., Liu S. -Y. and Xiang S. -H. (2006) Hydroisomerization of n-decane over Pt/SAPO-41 catalyst, Appl. Catal. A: Gen., 298, 144-151.
Kong W., Dai W., Li N., Guan N. and Xiang S. (2009) A one-step route to SAPO-46 using H3PO3-containing gel and its application as the catalyst for methanol dehydration, J. Mol. Catal. A: Chem., 308, 127-133.
Li, N., Ma, Y., Xiang, S. and Guan, N. (2006) Capturing an aluminophosphite intermediate in the new route of synthesizing zeolite-like aluminophosphates, Chem. Mater., 18, 975-980.
Shi, Y., Zhang, X., Wang, L. and Liu, G. (2014) Ionothermal synthesis of aluminophosphite NKX-2, Mater. Lett., 124, 212-214.
Gómez-Hortigüela, L., Pérez-Pariente, J., Corà, F., Catlow, C. R. A. and Blasco, T. (2005) Structure-directing role of molecules containing benzyl rings in the synthesis of a large-pore aluminophosphate molecular sieve: An experimental and computa-tional study, J. Phys. Chem., B 109, 21539-21548.
Wei, W., Moulijn, J.A. and MulG. (2008) Effect of steaming of iron containing AlPO-5 on the structure and activity in N2O decomposition, Micropor. Mesopor. Mater., 112, 193-201.
Weckhuysen, B.M., de Ridder, L. and Schoondeheydt, R.A. (1993) A quantitative diffuse reflectance spectroscopy study of supported chromium catalysts, J. Phys. Chem., 97, 4756-4763.
Chen, J., Zhang, H., Tomov, I.V., Ding, X. and Rentzepis, P.M. (2008) Photochemistry and electron transfer mechanism of transition metal oxalato complexes excited in the charge transfer band, PNAS., 105, 15235-15240.
Ng, E.-P., Delmotte, L. and Mintova, S. (2008)Environmentally benign synthesis of nanosized aluminophosphate enhanced by microwave heating, Green Chem., 10, 1043–1048.
Wang, Y., Wang, Y., Li, Y., Shi, H., Xu, Y., Qin, H., Li, X., Zuo, Y., Kang, S. and Cui, L. (2015) Simple synthesis of Zr-doped graphitic carbon nitride towards enhanced photocatalytic performance under simulated solar light irradiation, Catal. Commun., 72, 24-28.