期刊
JOURNAL OF RARE EARTHS
卷 28, 期 5, 页码 803-806出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(09)60205-2
关键词
synthesis details; acid/base; lactic acid; dehydration; rare earths
资金
- National Natural Science Foundation of China [20906051]
- Jiangsu Province Fundamental Research Plan [BK2009478]
- Hi-Tech Research and Development Program of China [2006AA020101]
- Nanjing University of Technology
Modified NaY zeolites have been widely studied and the modification metal element is normally single, while few researches have been conducted on NaY zeolites modified by two kinds of metals. In our study, a series of La3+ and Ba2+ modified NaY zeolites were synthesized through different impregnation procedures. Lactic acid dehydration to acrylic acid was selected as a probe reaction to test the catalytic performance of these zeolites synthesized. The effects of synthesis details on their pore structures and surface acid/base properties were investigated by means of techniques such as N-2 sorption, NH3-TPD and CO2-TPD. The characterization results demonstrated that the samples synthesized by two-step impregnation had more medium acid and base sites inducing better catalytic performance. Moreover, compared with successive impregnations, calcination between two impregnations could endow the samples with much more acid amount. These special surface properties resulted in the improvement of selectivity to acrylic acid during lactic acid dehydration.
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