石油化工2011，Vol.40Issue(5)：476-481,6.
金属离子改性NaY分子筛催化乳酸脱水制丙烯酸
Catalytic Dehydration of Lactic Acid to Acrylic Acid over NaY Zeolites Modified with Metallic Ions
摘要
Abstract
The catalytic dehydration of bio-based lactic acid to acrylic acid over the unmodified and the modified NaY zeolite catalysts with K+ , Ba2+ and La3+ was investigated and the thermodynamic analysis for the dehydration reaction was performed. The effects of the input concentration of lactic acid and the flow rate of nitrogen on the dehydration were studied. To improve the catalytic performance of the NaY catalyst, the NaY zeolite catalysts modified with K+, Ba2+ and La3+ were prepared and characterized by means of N2 adsorption, NH3-TPD and CO2-TPD. The results showed that the optimized concentration of lactic acid and the flow rate of nitrogen were 38% (w) and 30 mL/ min, respectively. The modification could change the surface acid/base distributions and affect the catalytic performance. La/NaY exhibited the highest acrylic acid yield 56.3 % at 325 t, which could be attributed to the appropriate acidic amount and high basic amount on the catalyst, while NaY only indicated 21.6% acrylic acid yield under the same conditions. The research showed that the suitable declines of both acidic sites and acid strength of the catalysts were beneficial to the formation of acrylic acid and could reduce the generation of acetaldehyde. And suitable decrease of the base strength and increase of the basic sites could improve the yield acrylic acid in the dehydration.关键词
NaY分子筛催化剂/乳酸/金属离子改性/脱水/丙烯酸Key words
NaY zeolite catalyst/ lactic acid/ metallic ion modification/ dehydration/ acrylic acid分类
化学化工引用本文复制引用
闫婕,余定华,孙鹏,黄和..金属离子改性NaY分子筛催化乳酸脱水制丙烯酸[J].石油化工,2011,40(5):476-481,6.基金项目
国家自然科学基金项目(20906051) （20906051）
江苏省基础研究计划项目(BK2009478) （BK2009478）
南京工业大学学科基金重点项目. （）
