在添加适量柠檬酸的条件下采用双模板剂一步法,一次晶化合成ZSM-5/EU-1核壳共生复合分子筛,对其物理化学性质进行表征,结果显示:核壳分子筛中存在ZSM-5和EU-1两种分子筛晶相,且EU-1分子筛在ZSM-5分子筛表面缺陷处外延生长;复合以后核壳分子筛为微孔-介孔多级孔道结构,且其微孔孔径达到0.94 rim;相比于单一分子筛,核壳分子筛的强酸量相对提高,酸性质有所改善.通过对柠檬酸加入量、晶化时间影响因素的分析,得到合成核壳共生结构的最佳条件为:n(citrate)/n(Al2O3)=0.8~1.2,晶化时间为72~96 h,并推测核壳分子筛可能的生长过程.
参考文献
[1] | Masaki Okamoto;Yukio Osafune.MFI-type zeolite with a core-shell structure with minimal defects synthesized by crystal overgrowth of aluminum-free MFI-type zeolite on aluminum-containing zeolite and its catalytic performance[J].Microporous and mesoporous materials: The offical journal of the International Zeolite Association,20112/3(2/3):413-418. |
[2] | 朱数金;刘粟侥;张怀科;吕恩静;任杰.SAPO-11/Beta复合分子筛的合成及其异构化性能研究[J].催化学报,2014(10):1676-1686. |
[3] | 倪友明;孙爱明;吴小岭;胡江林;李涛;李光兴.La/Zn/HZSM-5催化剂上的甲醇芳构化研究[J].中国化学工程学报(英文版),2011(3):439-445. |
[4] | P.C.Mihindou-Koumba;J.-D.Comparot;S.Laforge.Methylcyclohexane transformation over H-EU-1 zeolite:Selectivity and catalytic role of the acid sites located at the pore mouths[J].Journal of Catalysis,20082(2):324-334. |
[5] | Moreau, F;Moreau, P;Gnep, NS;Magnoux, P;Lacombe, S;Guisnet, M.Ethylbenzene isomerization over bifunctional platinum alumina-EUO catalysts: Location of the active sites[J].Microporous and Mesoporous Materials,20061/3(1/3):327-338. |
[6] | 王新波;杨冬花;石宝宝;武正簧;窦涛.基于双模板剂B-EU-1/ZSM-5复合分子筛的合成与表征[J].化工新型材料,2015(2):123-125. |
[7] | 任永利;王亚权;米镇涛.Fe-AlPO4-5分子筛的水热晶化过程研究[J].化学反应工程与工艺,2004(3):209-212. |
[8] | B. Marler;P. Daniels;J. Sane i Mune.Synthesis and structure of RUB-35, a disordered material of the EUO-NES-NON family[J].Microporous and Mesoporous Materials,20031/3(1/3):185-201. |
[9] | 孙长勇;宋一兵;叶飞;余林;郭锡坤.Fe-ZSM-5杂原子分子筛的合成与表征[J].光谱实验室,2003(3):448-451. |
[10] | 张强;李春义;山红红;杨朝合.气相转移法与水热合成法合成ZSM-5/SAPO-5核壳结构复合分子筛的比较[J].催化学报,2007(6):541-546. |
[11] | Jiajun Zheng;Qjnghu Zeng;Yuming Yi.The hierarchical effects of zeolite composites in catalysis[J].Catalysis Today,20111(1):124-132. |
[12] | van Donk S.;Janssen AH.;Bitter JH.;de Jong KP..Generation, characterization, and impact of mesopores in zeolite catalysts [Review][J].Catalysis Reviews. Science and Engineering,20032(2):297-319. |
[13] | 周洲;郭锡坤;潘伟雄;朱起明.纳米4A型分子筛的合成研究[J].天然气化工,2001(6):4-7. |
[14] | 张佩珊;马波;杨卫亚;凌凤香;沈智奇;王少军;候宇鑫.核壳结构 Beta/MCM-22双微孔复合分子筛的合成与表征[J].燃料化学学报,2014(10):1240-1245. |
[15] | Benoit Lousi;Lioubov Kiwi-Minsker.Synthesis of ZSM-5 zeolite in fluoride media:an innovative approach to tailor both crystal size and acidity[J].Microporous and Mesoporous Materials,20041/3(1/3):171-178. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%