| 引用本文: | 易冬梅,杜秋月,杨娜,张海东,熊昆,杨淇,陈佳,王晶晶.TiO2-SiO2复合材料的结构调变对其催化应用的影响[J].材料科学与工艺,2023,31(4):60-69.DOI:10.11951/j.issn.1005-0299.20220128. |
| YI Dongmei,DU Qiuyue,YANG Na,ZHANG Haidong,XIONG Kun,YANG Qi,CHEN Jia,WANG Jingjing.Effect of structural adjustment of TiO2-SiO2 composite materials on their catalytic applications[J].Materials Science and Technology,2023,31(4):60-69.DOI:10.11951/j.issn.1005-0299.20220128. |
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| TiO2-SiO2复合材料的结构调变对其催化应用的影响 |
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易冬梅,杜秋月,杨娜,张海东,熊昆,杨淇,陈佳,王晶晶
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(重庆工商大学 废油资源化技术与装备教育部工程研究中心,重庆 400067)
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| 摘要: |
| TiO2-SiO2复合材料(TSCM)的催化应用性能受到其所含TiO2物种的晶相和SiO2骨架的孔道结构的显著影响。本文归纳总结了TSCM中TiO2物种晶相、SiO2骨架的孔道结构、形貌等特性的调变规律及其对TSCM催化性能的影响,并展望了TSCM材料的结构特性演变趋势以及在制备方法上的取舍。TSCM直接作为催化剂时,其活性位普遍被认为是TiO2-SiO2界面上的Ti—O—Si键位和酸性位点。而作为载体材料时,TSCM中的TiO2物种可以与负载的金属活性中心表现出显著的载体-金属相互作用(SMSI),TiO2物种的晶相可以对形成的金属活性中心的性能产生显著影响。在TSCM材料的合成研究中,合成含有单一锐钛矿相(Anatase)TiO2物种的Anatase-SiO2或单一金红石晶相(Rutile)的Rutile-SiO2类型TSCM材料,以及同时含有这两个晶相TiO2,但晶相比例可调的A/R-SiO2类型TSCM材料仍充满挑战。TSCM的SiO2骨架特性调控也同样具有挑战,如何在得到特定晶相和粒子尺寸的TiO2物种的同时获得特定孔道特性和形貌特征的SiO2骨架,仍是研究的难点和热点。两步法无需同时控制TiO2和SiO2物种的制备参数,重现性好,多用于特殊形貌的TSCM的制备,但通常其中TiO2物种的分散度不佳。而一步法制备过程简短,更容易得到多孔-大比表面积材料,有利于实现TiO2粒子的尺寸控制及其在SiO2骨架中的均匀分布,从而得到更丰富的Ti—O—Si界面活性物种,但需要在同一合成体系中同时控制相互影响的TiO2和SiO2物种的制备参数,调控难度极大,与两步法相比,重现性较差。 |
| 关键词: TiO2 SiO2 复合材料 结构调变 催化应用 |
| DOI：10.11951/j.issn.1005-0299.20220128 |
| 分类号:TB333 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(U1362105, 22078032 ); 重庆市科委基础与前沿研究项目(cstc2021jcyj-msxmX0850, cstc2020jcyj-msxmX0345); 重庆市教委科学技术研究重点项目(KJZD-K201900805)；创新群体项目(CXQT21023). |
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| Effect of structural adjustment of TiO2-SiO2 composite materials on their catalytic applications |
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YI Dongmei, DU Qiuyue, YANG Na, ZHANG Haidong, XIONG Kun, YANG Qi, CHEN Jia, WANG Jingjing
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(Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China)
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| Abstract: |
| The catalytic performance of TiO2-SiO2 composite materials (TSCM) is highly affected by the crystalline phase of TiO2 species and the pore structure of SiO2 framework. This paper summarizes the tunning rules of the crystalline phase of TiO2 species and the pore structure and morphology of SiO2 framework in TSCM, as well as their effect on the catalytic performance of TSCM. The prospects of the structural evolution trend of TSCM and the trade-off in the choice of preparation methods for TSCM are also discussed. When TSCM are directly used as catalysts, the Ti—O—Si sites and the acid sites on their surface are generally considered to be active sites. The metal active centers supported on the TiO2 species in TSCM can exhibit strong-metal-support-interaction (SMSI) when TSCM are used as support materials. Furthermore, the catalytic performance of those metal active centers on the TiO2 species included in TSCM can be significantly affected by the crystalline phase of TiO2 species. In the synthesis of TSCM, to achieve Anatase-SiO2 or Rutile-SiO2 type TSCM with only anatase or rutile species or A/R-SiO2 type TSCM with adjustable amount of anatase and rutile is still tough work. The control of the texture properties of SiO2 framework in TSCM is also challenging. It is very difficult, in the preparation of TSCM, to obtain TiO2 species in specific crystalline phase and particle size and simultaneously achieve SiO2 framework with specific pore structure and morphology. For the choice of synthesis methods of TSCM, trade-off has to be faced. Two-step methods exhibit good reproducibility as there is no need to simultaneously control the different preparation factors for SiO2 and TiO2 species. With two-step methods, it is easy to obtain TSCM with special morphology but the dispersion of TiO2 species is usually poor. One-step preparation processes are relatively simple and convenient to obtain TSCM with porous structure and big specific area. One-step preparation processes can achieve size control of TiO2 particles and their uniform dispersion in SiO2 framework, and thus present more Ti—O—Si active sites. However, for one-step preparation processes, simultaneously tuning the dependent preparation factors for TiO2 and SiO2 species is necessary but extremely hard and thus leads to poor reproducibility compared with two-step methods. |
| Key words: TiO2 SiO2 composite materials structural adjustment catalytic application |
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