Oxidative dehydration of glycerol to acrylic acid over vanadium-impregnated zeolite beta

Journal of the Brazilian Chemical Society

Guerra, Antônio C. O.¹  Pestana, Carolina F. M.¹  Mota, Claudio J. A.¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil¹  Turci, Cássia C.¹  Ferreira, Glaucio B.¹  Universidade Federal Fluminense, Niterói, Brazil¹ 

关键词: glycerol;    acrylic acid;    zeolite;    dehydration;    oxidation;   

DOI  :  10.1590/S0103-50532013000100014

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The oxidative dehydration of glycerol to acrylic acid was studied over vanadium-impregnated zeolite Beta. Catalysts were prepared by wet impregnation of ammonium metavanadate over ammonium-exchanged zeolite Beta, followed by air calcination at 823 K. Impregnation reduced the specific surface area, but did not significantly affected the acidity (Brønsted and Lewis) of the zeolites. The catalytic evaluation was carried out in a fixed bed flow reactor using air as the carrier and injecting glycerol by means of a syringe pump. Acrolein was the main product, with acetaldehyde and hydroxy-acetone (acetol) being also formed. Acrylic acid was formed with approximately 25% selectivity at 548 K over the impregnated zeolites. The result can be explained by XPS (X-ray photoelectron spectroscopy) measurements, which indicated a good dispersion of the vanadium inside the pores.

【 授权许可】

Unknown