Liquid-phase Dehydration of d-xylose over Microporous and Mesoporous Niobium Silicates
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Microporous AM-11 crystalline niobium silicates were studied as solid acid catalysts for the dehydration of xylose in a water-toluene solvent mixture at 140–180 °C. After 6 h at 160 °C, xylose conversions of up to 90% and furfural yields of up to 50% were achieved, and the catalysts could be reused without loss of activity or selectivity. The calcined AM-11 catalysts gave higher furfural yields than HY zeolite and mordenite, under identical reaction conditions. Ordered mesoporous MCM-41-type niobium silicates with Si/Nb molar ratios of either 25 or 50 were also found to be recyclable catalysts for xylose dehydration, and gave furfural yields consistently in the range of 34–39% (after 6 h reaction at 160 °C).
Keywordsxylose furfural dehydration acid catalysis niobium silicates microporous mesoporous
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- 2.H. J. Brownlee and C. S. Miner, Ind. Eng. Chem. (1948) 201.Google Scholar
- 3.K.J. Zeitsch, The Chemistry and Technology of Furfural and Its Many By-Products, Ist ed., in: Sugar Series, vol.13, Elsevier, The Netherlands, 2000.Google Scholar
- 4.C. Moreau, Agro-Food-Industry Hi-Tech (2002) 17.Google Scholar
- 10.Ziolek, M. 2003Catal. Today7847Google Scholar
- 11.J. Rocha, P. Brandão, A. Phillippou and M. Anderson, Chem. Commun. (1998) 2687.Google Scholar
- 12.J. Rocha, P. Brandão, J.D. Pedrosa de Jesus, A. Philippou and M. Anderson, Chem. Commun. (1999) 471.Google Scholar
- 13.Prakash, A.M., Kevan, L. 1998J. Am. Chem. Soc.12013148Google Scholar
- 15.Salvadó, M.A., Pertierra, P., García-Granda, S., Khainakov, S.A., García, J.R., Bortun, A.I., Clearfield, A. 2001Inorg. Chem.404368Google Scholar
- 22.Seri, K., Inoue, Y., Ishida, H. 2001Bull. Chem. Soc. Jpn.761145Google Scholar