童鞋论文网专业提供代写本科论文、代写硕士论文、代写职称论文、代写毕业论文、论文发表等服务,上万成功案例,欢迎咨询。 网站地图  |  加入收藏  |  设为首页
童鞋论文网
热门搜索
行政 教育 营销 法律 经济 护理 心理 会计 文学 工商 计算机 旅游
站内搜索:
童鞋论文网
 当前位置:童鞋论文网 > 专科论文 > 文章正文
 
多孔ETS-10沸石的合成、表征及其催化性能研究
论文作者:童鞋论文网  论文来源:www.txlunwenw.com  发布时间:2019/9/9 8:29:47  

摘要:ETS-10沸石是具有三维孔道结构的强碱性钛硅沸石,具有高的水热稳定性、较强的离子交换能力和碱催化等特点。由于反应物分子在微孔ETS-10沸石的孔道中流动扩散速率较低,对大分子进入孔道内反应也有很大的限制作用。为了使ETS-10沸石更好的应用于反应,可采用引入介孔和将ETS-10沸石进行纳米化来解决这些问题。本文采用水热合成的方法着重探究了介孔、纳米ETS-10沸石的合成,合成了具有高比表面积并且形貌不同的介孔ETS-10沸石,并将ETS-10沸石进行纳米化,合成纳米颗粒和纳米片状这两种不同形貌的ETS-10沸石,大大提高了外表面积和介孔孔容,不仅缩小了沸石的晶粒尺寸,增大了反应面积,还减小了分子在孔道中的扩散距离,使之适用于更多不同类型的反应。

本文第二章,以水玻璃和固体SiO2为硅源、三氯化钛和钛酸四丁酯为钛源,使用水热合成法分别合成微孔ETS-10沸石,经过XRD、N2吸附、SEM表征,结果发现不同硅源均能合成高结晶度高的ETS-10沸石,以TiCl3为钛源比钛酸四丁酯更容易合成无杂峰的微孔ETS-10沸石。

本文第三章,在掺杂金属Co、Ni、Cu的条件下,结合模板剂N-N二乙基-N-十八烷基-N-(3-甲氧基硅烷丙烷)溴化铵(DM-3010)合成高结晶度的介孔ETS-10沸石,掺杂金属Ni合成的晶粒表面粗糙且有大的凹面,尺寸约为10 μm,掺杂Co的ETS-10沸石形貌呈层叠状堆积,颗粒大小约为6 μm。另外采用价格低廉的季铵盐模板剂(QAT),以固体SiO2为硅源,合成表面粗糙并具有层叠堆积形貌的介孔ETS-10沸石,沸石晶粒尺寸约为7 μm。

本文第四章,分别以水玻璃和固体SiO2为硅源,在成本较低的模板剂QAT作用下合成50-100 nm颗粒大小不等的ETS-10沸石团聚体,团聚体颗粒大小约为1-2 μm,在以DM-3010为模板剂,掺杂金属镍、钴,合成厚度为50 nm的纳米片状ETS-10沸石。

本文第五章,合成了高比表面积、高结晶度的介孔Beta沸石,并将Beta沸石、ETS-10沸石用于肉桂醛加氢反应,探究酸性沸石和碱性沸石对于肉桂醛加氢反应的催化效果,在相同的反应条件下,ETS-10沸石具有更高的反应活性。

ETS-10 zeolite is a three-dimensionalporous titanium silicon zeolite with strong base, which has high hydrothermalstability, strong ion exchange capacity and base catalytic ability. Themicroporous of ETS-10 zeolite has a great restriction of the macromolecularreaction and results in the lower diffusion of reactant molecules into thepores. In order to a wider application of ETS-10 zeolite, the introduction ofmesopores and the nanocrystallization of ETS-10 zeolite can be used to solvethese problems. In this paper, hydrothermal synthesis was used to study thesynthesis of mesoporous and nano-ETS-10 zeolites. The mesoporous ETS-10 zeolitewith high specific surface area and different morphology was synthesized andnanosized successfully. Nanosheets and nanoparticles of ETS-10 zeolite not onlydecreases the grain size of the zeolite, greatly increase the external surfacearea and mesoporous pore volume increases the reaction area, it also reducesthe diffusion distance of molecules in the pores and making them suitable formore different types of reactions.

In the second chapter of this paper, themicroporous ETS-10 zeolite was synthesized by hydrothermal method. The siliconsources were sodium silicate and solid SiO2 and the titanium sources weretitanium trichloride and tetrabutyl titanate. The zeolite was characterized byXRD, N2 adsorption and SEM. The results show that ETS-10 zeolite with highcrystallinity can be synthesized with different silicon sources. Further more,it is easier to synthesize microporous ETS-10 zeolite without impurity peakswhen TiCl3 was titanium source than tetrabutyl titanate.

In the third chapter, under the conditionsof doping metal Co, Ni and Cu, the mesoporous ETS-10 zeolite with highcrystallinity was prepared with N-N diethyl-N-octadecyl-N-(3-methoxy silanepropane) ammonium bromide (DM-3010) as template. The crystal grains of ETS-10zeolite synthesized by Ni-doped, which has a rough surface and a large concavesurface with a size of about 10 μm. The morphology of Co-doped ETS-10 zeoliteis stacked, and the particle size is about 6 μm. In addition, the low-costquaternary ammonium salt template(QAT) is used to synthesize mesoporous ETS-10zeolite with the solid SiO2 as the silicon source, the surface of thesynthesized mesoporous ETS-10 zeolite is rough and has a stacked depositionmorphology, and the zeolite grain size was about 7 μm.

In the fourth chapter, water glass andsolid SiO2 were respectively used as the silicon source to prepare the ETS-10zeolite by the incorporation of low-cost quaternary ammonium templatingagent(QAT). The size of aggregating ETS-10 particle ranging from 50 to 100 nmand the single agglomerate particle is about 1-2 μm. Doped with nickel andcobalt, nano-sheet ETS-10 zeolite was synthesized with a thickness of 50 nm.

In the fifth chapter, a high specificsurface area, high crystallinity mesoporous Beta zeolite was synthesizedsuccessfully. Beta zeolite and ETS-10 zeolite were used in the hydrogenation ofcinnamaldehyde to investigate the different hydrogenation abilities between aiczeolite and basic zeolite. The results showed that ETS-10 zeolite has higherreactivity under the same reaction conditions.

关键词:ETS-10沸石;水热合成;纳米化;酸碱催化

ETS-10 zeolite;Hydrothermalsynthesis;Nanocrystallization;Acid-base catalysi

上一篇:基于乙烯基聚合物阴离子交换膜的制备与性能研究     下一篇:全民阅读背景下《三国演义》接受调查研究
 
论文客服 95702844
论文热线18796337551
本站网址 www.txlunwenw.com
郑重承诺 原创,包修改,包通过!
童鞋论文网真诚欢迎新老客户的光临与惠顾!
 
 热门文章
· 住宅建设用地使用权续期研究
· 用户锁定效应视角下的网易云音
· 众筹产品创新性对融资绩效的影
· 南京市城镇居民冷鲜肉认知度问
· 摩拜共享单车可持续盈利研究
· 催生地方政府隐性债务风险的原
· 社交媒体中不实信息转发主体心
· 基于网络平台的SPA模式研究——
· 基于游客感知的云台山景区微信
· 新媒体时代背景下乡村旅游企业
 
 推荐文章
· 部编版小学语文文言文类文章编
· F模型下“嘉欣丝绸”财务风险研
· 基于4V理论的云南嘉华饼屋营销
· 论商业性小屏直播的主持互动策
· 新兴偶像经济发展现状及发展建
· 辅助线在小学生空间观念培育中
· 罗浮山国家级风景名胜区探险旅
· 基于《预算法》的地方政府债务
· 商品房买卖合同“霸王条款”存
· 中泰水果贸易竞争力比较分析
 
 相关文章
· 可见光驱动的钽酸钠复合材料光
· 环酯草醚合成工艺优化及嘧啶硫
· 石墨烯基尖晶石型金属氧化物复
· Pt基一维纳米材料的可控合成及
· 我国中小学教师赋权增能的问题
· 论臭氧催化氧化在染料喷雾干燥
· 方酸菁染料的理化性质及合成研
· 超支化聚合物的合成方法探讨
· 催化裂化进料喷嘴的性能要求及
· 开工初期MTBE颜色发黄研究

论文原创,准时交稿,包修改,包通过,八年信誉,品质保证
童鞋论文网提供代写本科论文,代写专科论文,代写毕业论文,代写职称论文,代写硕士论文,论文发表及查重服务
备案号:苏ICP备11011187号-1 苏公网安备32030502000117号
版权归童鞋论文网所有 禁止一切商用盗用