共查询到20条相似文献,搜索用时 78 毫秒
1.
应用XRD、XPS、IR、^29sIMASNMR,^27AlMASNMR和NO-IR吸附等手段对一系列经不同温度焙烧的Mo/USY催化剂中USY骨架结构破坏过程和Mo在USY分子筛中的烧结行为进行了研究。结果表明,Mo在USY上分散和烧结时,存在一个Mo对USY分子筛骨架铝的抽提过程,Mo和USY分子筛表面分散时,抽提该分筛骨架Si(2Al)中少量的Al,但当焙烧温度升高,Mo开始烧结时,Mo主要 相似文献
2.
用SAXS法和偏光显微镜研究了PTMPS均聚物和PTMPS DMS多嵌段共聚物熔体结晶的亚微观结构.结果表明PTMPS和PTMPS DMS的亚微观结构参数,和球晶形态、晶体界面自由能表观积及基本物性参数等存在密切相关性.当DMS含量为50%时亚微观结构参数均显示一个转折变化过程,此时,球晶形态、晶体界面自由能、熔点、玻璃化温度和结晶度指数亦呈现一个突变过程. 相似文献
3.
沸石载体结构对甲烷无氧芳构化性能的影响 总被引:6,自引:1,他引:6
考察了担载MoO3的沸石催化剂上甲烷的无氧芳构化性能,并与沸石结构相关联。结果表明,孔径与苯分子动态直径相当的ZSM-5、ZSM-8、ZSM-11和β沸石等是甲烷无氧芳构化催化剂的良好载体,其中3%MoO3/HZSM-11具有最高的甲烷芳构化活性和稳定性,973K下的转化HMCM-41和HSAPO-34为载体时芳构化活化很低,以HMOR、HX和HY为载体时仅有少量乙烯生成,而以HSAPO-5和HS 相似文献
4.
5.
利用DSC、DMA、TEM和XPS对[PSF-PDMS-PHS]n/PSF共混物的相容性及表面组成进行了研究.结果表明,PDMS在共混物表面的富集与PSF均聚物和[PSF-PDMS-PHS]n中硬段的相容性有关;PDMS在相容的共混物体系表面的富集与对应的多嵌段共聚物组成基本相近;不相容共混物体系表面PDMS的富集程度相对较高,当共混物本体中有机硅含量从1%增至5%,表面层PDMS的含量迅速增加,可达到嵌段共聚物中PDMS的含量. 相似文献
6.
以1,6-己二胺为模板剂合成了ZSM-35分子筛,通过对比ZSM-35、ZSM-5和丝光沸石的合成条件,采用化学组成分析、热重分析及~(13)CNMR等技术研究了1,6-己二胺和乙二胺的模板效应。结果表明,二者均对ZSM-35有较好的模板作用,而1,6-己二胺对ZMS-5的模板效应更佳。 相似文献
7.
固相配位化学反应研究:LXVII.金属铜表面M—S(M=Mo,W)簇合物的组成 总被引:2,自引:0,他引:2
采用FTIR、XPS和AES研究了金属铜表面M-S(M=Mo,W)簇合物膜。结果表明,Mo(W)S^2-4与铜表面的Cu2O反应,形成了Mo(W)-S-Cu键。簇合物膜由Mo(W),S,Cu,O元素组成,分别呈+6、-2、+1、-2价,膜为多分子层结构并保持,MoS4或WS2单元,膜表面只有Cu,O而不存在Mo(W),S,膜层厚度与反应时间有关,时间越长,膜越厚,膜为多组分的复杂体系,其颜色是各组 相似文献
8.
含有机硅三元多嵌段共聚物的研究5.含有机硅三元多嵌段共聚物的形态结构 总被引:1,自引:1,他引:0
利用DMA,TEM和SAXS对PSF-PDMS-PHSn,PSF-PDMS-PHEn,PPO-PDMS-PHSn和PHS-PDMS-PBEn四种三元多嵌段共聚物的形态结构进行了研究,结果表明,不同三元多嵌段共聚物中三种链段的相互作用情况不同,其动态力学性能和形态结构有很大差异,并与嵌段共聚物微相分离的几种基本形态不同,特别是通过TEM在PSF-PDMS-PHSn和PPO-PDMS-PHSn中观察到清晰的互容界面相。 相似文献
9.
硫化态K—MoO3/γ—Al2O3催化剂表面物种的XPS研究 总被引:2,自引:0,他引:2
采用X光光电子能谱及曲线氦合手段对硫化态K-MoO3/Al2O3合成醇催化剂进行了研究,分别考察负载量及硫化前不同条件预处理对催化剂表面的S、Mo组分的物种形式及各物种相对含量的影响,以及表面不同组分的相对组成。结果表明,根据其电子结合能变化,S组分可区分为SO^2-4、SO3、S^0、MoS2、MoS2-x等六种存在形式不同的物种;Mo组分可分为Mo^6+、Mo^5+、MoS^2+、MoS2、M 相似文献
10.
11.
12.
13.
Shunzhang You Dr. HuiTeng Tan Licheng Wei Dr. Wei Tan Prof. Cheng Chao Li 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(48):12237-12256
Silicon-based materials that have higher theoretical specific capacity than other conventional anodes, such as carbon materials, Li2TiO3 materials and Sn-based materials, become a hot topic in research of lithium-ion battery (LIB). However, the low conductivity and large volume expansion of silicon-based materials hinders the commercialization of silicon-based materials. Until recent years, these issues are alleviated by the combination of carbon-based materials. In this review, the preparation of Si/C materials by different synthetic methods in the past decade is reviewed along with their respective advantages and disadvantages. In addition, Si/C materials formed by silicon and different carbon-based materials is summarized, where the influences of carbons on the electrochemical performance of silicon are emphasized. Lastly, future research direction in the material design and optimization of Si/C materials is proposed to fill the current gap in the development of efficient Si/C anode for LIBs. 相似文献
14.
Takashi Kato Norihiro Mizoshita Kenji Kishimoto 《Angewandte Chemie (International ed. in English)》2006,45(1):38-68
In the 21st century, soft materials will become more important as functional materials because of their dynamic nature. Although soft materials are not as highly durable as hard materials, such as metals, ceramics, and engineering plastics, they can respond well to stimuli and the environment. The introduction of order into soft materials induces new dynamic functions. Liquid crystals are ordered soft materials consisting of self‐organized molecules and can potentially be used as new functional materials for electron, ion, or molecular transporting, sensory, catalytic, optical, and bio‐active materials. For this functionalization, unconventional materials design is required. Herein, we describe new approaches to the functionalization of liquid crystals and show how the design of liquid crystals formed by supramolecular assembly and nano‐segregation leads to the formation of a variety of new self‐organized functional materials. 相似文献
15.
16.
Hyun Jeong Seo Sumin Kim Wansoo Huh Kyung-Won Park Dong Ryeol Lee Dong Won Son Yong-Shik Kim 《Journal of Thermal Analysis and Calorimetry》2016,123(3):1935-1942
We sought to improve the flame-retardant performance of wood-based materials through the development of a coating material using carbon-based materials. The coating materials were applied to the surfaces of wood-based materials used for interior materials and furniture. We measured fire characteristics of the coated wood-based materials using a cone calorimeter. The coating materials were prepared by the mixing of carbon materials, such as natural graphite, expandable graphite, and exfoliated graphite nanoplatelets, in water-based coating materials. TG analysis revealed that water-based coating materials/carbon material-blended composites had good thermal durability in the working temperature ranges. The flame-retardant performance was confirmed through cone calorimeter experiments, and the result of the experiment satisfied the standard for flame-retardant performance in ISO 5600-1. 相似文献
17.
无机多孔材料因其具有特殊的物化性能在化工、能源、环保等相关领域被广泛应用。本文总结了无机多孔材料的当前研究进展,详细介绍了微孔、介孔、大孔材料和大孔-介孔、大孔-微孔、介孔-微孔以及大孔-介孔-微孔等复合孔材料的制备方法,并介绍了无机多孔材料在室内、外等环保催化领域的应用,特别介绍了多孔材料对于消除移动源污染的应用。最后,对当前无机多孔材料在制备方面存在的问题进行了总结,并对今后无机多孔材料的制备方法和研究方向进行了展望。 相似文献
18.
《Chemical record (New York, N.Y.)》2018,18(2):118-136
The frequent occurrence of water pollution accidents and the leakage of organic pollutants have caused severe environmental and ecological crisis. It is thus highly imperative to find efficient materials to solve the problem. Inspired by the lotus leaf, superwetting materials are receiving increasing attention in the field of removal of organic pollutants from water. Various superwetting materials have been successfully generated and integrated into devices for removal of organic pollutants from water. On the basis of our previous work in the field, we summarized in this account the progress of removal of (1) floating and underwater insoluble, (2) emulsified insoluble, and (3) both insoluble and soluble organic pollutants from water using superwetting materials including superhydrophobic & superoleophilic materials, superhydrophilic & underwater superoleophobic materials, and materials with controllable wettability. The superwetting materials are in the forms of 2D porous materials, 3D porous materials and particles, etc. Finally, the current state and future challenges in this field are discussed. We hope this account could shed light on the design of novel superwetting materials for efficient removal of organic pollutants from water. 相似文献
19.
In the 21st century, soft materials will become more important as functional materials because of their dynamic nature. Although soft materials are not as highly durable as hard materials, such as metals, ceramics, and engineering plastics, they can respond well to stimuli and the environment. The introduction of order into soft materials induces new dynamic functions. Liquid crystals are ordered soft materials consisting of self-organized molecules and can potentially be used as new functional materials for electron, ion, or molecular transporting, sensory, catalytic, optical, and bio-active materials. For this functionalization, unconventional materials design is required. Herein, we describe new approaches to the functionalization of liquid crystals and show how the design of liquid crystals formed by supramolecular assembly and nano-segregation leads to the formation of a variety of new self-organized functional materials. 相似文献