Heteropolymolybdates-Modified Zirconia as a Solid Catalyst for Ring-Open Polymerization of Tetrahydrofuran

Abstract:

Heteropolymolybdates-modified zirconia solid acid catalysts were prepared by dispersing molybdophosphoric acid (MPA) on zirconium hydroxide (ZH) and calcining the MPA/ZH materials at 750 °C. The initial loadings of MPA on ZH were 5-25 wt%. The catalysts were characterized by N₂ adsorption, XRD, FTIR, Py-IR, and NH₃-TPD analysis, and they were used as catalysts for the ring-open polymerization of tetrahydrofuran. The results show that, after calcination at 750 °C, the major molybdenum species are zirconia-anchored polymolybdate surface species and ZrMo₂O₈. The catalysts show both Brönsted and Lewis acidities, and the catalyst with 15% loading has the highest total acidity and catalytic activity because of the near-saturation coverage of the surface molybdenum species on support. Under the reaction conditions of 40 °C for 20 h, the catalyst sample, 15MPZ-750, gives a high polymer yield of 49% and a desirable number average molecular weight of 2262. A preliminary recycle study indicates a good reusability of these materials.

• Periodical: Advanced Materials Research (Volumes 550-553)
• Pages: 243-247
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.550-553.243
• Online since: July 2012
• Authors: Yan Xia Shi, Li Ping Liang, Yong Xiang Zhao
• Keywords: Heteropolymolybdate, Polymerization, Tetrahydrofuran, Zirconia

References

[1] N. Bhatt, P. Sharma, A. Patel and P. Selvam: Catal. Commun. Vol. 9 (2008), p.1545

[2] K.M. Parida, Sujata Mallick and G.C. Pradhan: J. Mol. Catal. A-Chem. Vol. 297 (2009), p.93

[3] L.P. Liang, Q. Zhu, Y.X. Zhao and D.S. Liu: Acta Chim. Sinica Vol. 69 (2011), p.1881 (in Chinese)

[4] Biju M. Devassy, F. Lefebvre and S.B. Halligudi: J. Catal. Vol. 231 (2005), p.1

[5] Biju M. Devassy and S.B. Halligudi: J. Catal. Vol. 236 (2005), p.313

[6] G. Sunita, Biju M. Devassy, Ajayan Vinu, Dhanashri P. Sawant, V.V. Balasubramanian and S.B. Halligudi: Catal. Commun. Vol. 9 (2008), p.696

[7] Nishita Lucas, Ankur Bordoloi, Amol P. Amrute, Palraj Kasinathan, Ajayan Vinu, Walter Bohringer, Jack C.Q. Fletcher and S.B. Halligudi: Appl. Catal. A-Gen. Vol. 352 (2009), p.74

DOI: 10.1016/j.apcata.2008.09.032

[8] Q. Zhu, L.P. Liang, Z.Q. Jia, C.G. Gao and Y.X. Zhao: Acta Phys.-Chim. Sin. Vol. 27 (2011), p.491 (in Chinese)

[9] L.P. Liang, Q. Zhu, Y.X. Zhao and D.S. Liu: Acta Phys.-Chim. Sin. Vol. 27 (2011), p.1933 (in Chinese)

[10] Claudinei F. Oliveira, Luiz M. Dezaneti, Fillipe A.C. Garcia, Julio L. de Macedo, José A. Dias, Sílvia C.L. Dias and Kayne S.P. Alvim: Appl. Catal. A-Gen. Vol. 372 (2010), p.153

[11] M. Zhao, Z.Q. Jia, L.L. Zhao, Z.J. Sun, X.W. Liu, P.F. Wang and C.G. Gao: J. Mol. Catal. Vol. 24 (2010), p.117 (in Chinese)

[12] Biju M. Devassy, F. Lefebvre, Walter B¨ohringer, Jack Fletcher and S.B. Halligudi: J. Mol. Catal. A-Chem. Vol. 236 (2005), p.162

[13] Dora E. López, Kaewta Suwannakarn, David A. Bruce and James G. Goodwin Jr.: J. Catal. Vol. 247 (2007), p.43

[14] Israel E. Wachs, Taejin Kim and Elizabeth I. Ross: Catal. Today Vol. 116 (2006), p.162

[15] T. Onfroy, G. Clet and M. Houalla: J. Phys. Chem. B Vol. 109 (2005), p.3345

[16] V. Lebarbier, G. Clet and M. Houalla: J. Phys. Chem. B Vol. 110 (2006), p.13905