载体酸性对Mo/HZSM-5-Al2O3催化剂上烯烃歧化反应性能的影响

催化学报 , 2011, 32(11): 1747-1754. doi: 10.3724/SP.J.1088.2011.10744

载体酸性对Mo/HZSM-5-Al2O3催化剂上烯烃歧化反应性能的影响

张大洲 ^1, , 李秀杰 ^2, , 刘盛林 ^3, , 朱向学 ^4, , 辛文杰 ^5, , 谢素娟 ^6, , 曾蓬 ^7, , 徐龙伢 ^8,

1.中国科学院大连化学物理研究所,辽宁大连116023;中国科学院研究生院,北京100049

2.中国科学院大连化学物理研究所,辽宁大连116023

3.中国科学院大连化学物理研究所,辽宁大连116023

4.中国科学院大连化学物理研究所,辽宁大连116023

5.中国科学院大连化学物理研究所,辽宁大连116023

6.中国科学院大连化学物理研究所,辽宁大连116023

7.中国寰球工程公司辽宁分公司,辽宁抚顺113006

8.中国科学院大连化学物理研究所,辽宁大连116023

基金项目: 国家自然科学基金(20903088)

关键词：乙烯 , 丁烯 , 歧化反应 , 丙烯 , 载体酸性 , HZSM-5分子筛 , 氧化铝

Effects of Support Acidity on the Catalytic Performance of Mo/HZSM-5-Ai2O3 Catalysts in Olefin Metathesis

在固定床反应器上考察了Mo/HZSM-5-Al2O3催化剂上乙烯与2-丁烯歧化制丙烯反应的性能.结合X射线衍射、NH3程序升温脱附、吡啶吸附红外光谱、H2程序升温还原和程序升温氧化等表征结果发现,载体酸性的差异导致催化剂酸性和 Mo物种落位方式不同.载体酸性较强时,催化剂积炭严重,反应稳定性差;载体酸性较弱时,Mo物种在分子筛孔道内以(Mo2O5)2+团簇形式存在,而在Al2O3表面形成较多易还原的六配位Mo物种,催化活性低,并呈现出一定的诱导期；适中酸性的载体有利于Mo物种的分散和活化,表现出了最佳的歧化反应活性.

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