期刊文献+
共找到43篇文章
< 1 2 3 >
每页显示 20 50 100
Phosphotungstic acid immobilized on amino-functionalized TS-1 zeolite as a solid acid catalyst for the synthesis of tributyl citrate
1
作者 Pei Li Bianfang Shi +4 位作者 Junyao Shen Ran Cui Wenze Guo Ling Zhao Zhenhao Xi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第6期199-210,共12页
The amino-functionalization of TS-1 zeolite followed by immobilization of phosphotungstic acid(HPW)was presented to prepare a strong solid acid catalyst for the synthesis of bio-based tributyl citrate from the esterif... The amino-functionalization of TS-1 zeolite followed by immobilization of phosphotungstic acid(HPW)was presented to prepare a strong solid acid catalyst for the synthesis of bio-based tributyl citrate from the esterification of citric acid and n-butanol.γ-Aminopropyltriethoxysilane(APTES)was first grafted on the TS-1 zeolite via the condensation reactions with surface hydroxyl groups,and subsequently the HPW was immobilized via the reaction between the amino groups and the protons from HPW-forming strong ionic bonding.The Keggin structure of HPW and MFI topology of TS-1 zeolite were well maintained after the modifications.The amino-functionalization generated abundant uniformly distributed active sites on TS-1 for HPW immobilization,which promoted the dispersity,abundance,as well as the stability of the acid sites.The tetrahedrally coordinated framework titanium and non-framework titania behaved as weak Lewis acid sites,and the protons from the immobilized HPW acted as the moderate or strong Brønsted acid sites.An optimized TBC yield of 96.2%(mol)with a conversion of-COOH of 98.1%(mol)was achieved at 150℃for 6 h over the HPW immobilized on amino-functionalized TS-1.The catalyst exhibited good stability after four consecutive reaction runs,where the activity leveled off at still a relatively high level after somewhat deactivation possibly caused by the leaching of a small portion of weakly anchored APTES or HPW. 展开更多
关键词 AMINO-FUNCTIONALIZATION Phosphotungstic acid ts-1 zeolite ESTERIFICATION Tributyl citrate
下载PDF
Titanium-rich TS-1 zeolite for highly efficient oxidative desulfurization 被引量:3
2
作者 Risheng Bai Yue Song +3 位作者 Ge Tian Fei Wang Avelino Corma Jihong Yu 《Green Energy & Environment》 SCIE EI CSCD 2023年第1期163-172,共10页
The exploration of highly efficient catalysts based on nano-sized Ti-rich titanosilicate zeolites with controllable active titanium species is of great importance in zeolite catalytic reactions.Herein,we reported an e... The exploration of highly efficient catalysts based on nano-sized Ti-rich titanosilicate zeolites with controllable active titanium species is of great importance in zeolite catalytic reactions.Herein,we reported an efficient and facile synthesis of nano-sized Ti-rich TS-1(MFI)zeolites by replacing tetrabutyl orthotitanate(TBOT)with tetrabutyl orthotitanate tetramer(TBOT-tetramer)as the titanium source.The introduced TBOT-tetramer slowed down the zeolite crystallization process,and accordingly balanced the rate of incorporating Ti and the crystal growth and inhibited the massive formation of anatase species.Notably,the prepared Ti-rich TS-1 zeolite sample had a Si/Ti as low as 27.6 in contrast to conventional one with a molar ratio of 40.The TBOT-tetramer endowed the titanosilicate zeolites with enriched active titanium species and enlarged external surface area.It also impeded the formation of anatase species,resulting in superior catalytic behavior toward the oxidative desulfurization of dibenzothiophene compared with the conventional TS-1 zeolite counterpart prepared with TBOT. 展开更多
关键词 ts-1 zeolite Ti-rich Heterogeneous catalysis Oxidative desulfurization
下载PDF
The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts 被引量:8
3
作者 仲兆祥 李冬燕 +2 位作者 刘馨 邢卫红 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第1期53-57,共5页
Ceramic ultrafiltration membranes were used to separate titanium silicalite-1 (TS-1) catalysts from the slurry of catalytic ammoximation of cyclohexanone to oxime. Silica was shown to have a great effect on membrane... Ceramic ultrafiltration membranes were used to separate titanium silicalite-1 (TS-1) catalysts from the slurry of catalytic ammoximation of cyclohexanone to oxime. Silica was shown to have a great effect on membrane fouling in the alkaline environment of this system. In the ammoximation system, there are three main silica sources, which are residual silica on the catalyst particles surface during preparation, silica dissolved from TS-1 catalyst particles by ammonia solvent, and silica sol added into the reaction slurry to inhibit the dissolution erosion of the TS-1 catalyst. The silica dissolved by ammonia has been proved to influence membrane fouling most among the three silica sources. This was because the amount of silica dissolved by ammonia was the largest, and the polymerization of silica monomers at high concentration caused colloid particles formation, which led to a dense cake layer depositing on the membrane surface. Meanwhile, the size reduction of catalyst particles caused by alkaline dissolution also increased specific resistances of cake layers. 展开更多
关键词 ts-1 catalyst ceramic membrane membrane fouling
下载PDF
The synthetic strategies of hierarchical TS-1 zeolites for the oxidative desulfurization reactions 被引量:2
4
作者 Guoju Yang Ji Han +2 位作者 Yue Liu Ziyi Qiu Xiaoxin Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第9期2227-2234,共8页
With the increasingly stringent standards for limiting sulfide content in liquid fuels,oxidative desulfurization(ODS)has become a promising ultra-deep desulfurization process in fuel desulfurization.TS-1 zeolites show... With the increasingly stringent standards for limiting sulfide content in liquid fuels,oxidative desulfurization(ODS)has become a promising ultra-deep desulfurization process in fuel desulfurization.TS-1 zeolites show great potential as catalysts for ODS reactions,due to its remarkable oxidation activity at low temperatures and pressure.However,the inherent microporous structure of conventional TS-1 zeolites restricts the mass transportation and renders the active sites in the microporous space of TS-1 zeolites inaccessible for bulky aromatic organosulfur compounds.Fabrication of hierarchical TS-1 zeolites by incorporating meso-/macropores into microporous TS-1 zeolites is an effective strategy to improve mass transportability.In recent years,abundant efforts have been dedicated to developing synthetic strategies of hierarchical TS-1 zeolite,thereby improving its catalytic performance in the ODS process.This mini-review addresses the synthetic methods of hierarchical TS-1 catalysts and their catalytic performance in the ODS reactions.In addition,some current problems and prospects of synthesis routes for constructing hierarchical TS-1 catalysts have also been revised.We expect this mini-review to shed light on the more efficient preparation strategies of hierarchical TS-1 zeolites for the ODS process. 展开更多
关键词 zeolites ts-1 Synthesis HIERARCHICAL ODS
下载PDF
Amino acid-assisted synthesis of TS-1 zeolites containing highly catalytically active TiO_(6)species 被引量:2
5
作者 Yuyao Wang Li Li +4 位作者 Risheng Bai Shiqin Gao Zhaochi Feng Qiang Zhang Jihong Yu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第12期2189-2196,共8页
Tailoring the Ti coordination states in titanosilicate zeolites to simultaneously improve feedstock conversion and maximize the target product selectivity remains a challenge in the pursuit of high-performance catalys... Tailoring the Ti coordination states in titanosilicate zeolites to simultaneously improve feedstock conversion and maximize the target product selectivity remains a challenge in the pursuit of high-performance catalysts for selective oxidation reactions.Herein,we provide a facile strategy to synthesize hierarchical anatase-free TS-1(MFI-type)zeolites with tetrahedrally coordinated(TiO_(4))and octahedrally coordinated Ti species(TiO_(6)).The TiO_(4)species provide high epoxide selectivity,while the TiO_(6)species afford improved alkene conversion.This strategy is achieved by synergistically using an L-lysine-assisted approach and a two-step crystallization;the two-step crystallization approach prevents the formation of anatase TiO_(2),while L-lysine stabilizes the TiO_(6)species and ensures efficient incorporation of TiO_(6)into the anatase-free TS-1 zeolites.Compared with their conventional counterparts,which only contain TiO_(4)species,the as-prepared TS-1 zeolites(Si/Ti=36.9)result in a higher 1-hexene conversion(33%),higher TON value(153),and comparable epoxide selectivity(95%).This synthetic strategy provides avenues to tailor the amount and distribution of Ti species in titanosilicate zeolites to achieve high catalytic performances in various processes. 展开更多
关键词 ts-1 zeolites Ti species L-Lysine-assisted approach 1-Hexene epoxidation
下载PDF
One-step Continuous Phenol Synthesis Technology via Selective Hydroxylation of Benzene over Ultrafine TS-1 in a Submerged Ceramic Membrane Reactor 被引量:2
6
作者 姜红 佘飞 +2 位作者 杜艳 陈日志 邢卫红 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第Z1期1199-1207,共9页
A new route towards phenol production by one-step selective hydroxylation of benzene with hydrogen peroxide over ultrafine titanium silicalites-1(TS-1) in a submerged ceramic membrane reactor was developed, which can ... A new route towards phenol production by one-step selective hydroxylation of benzene with hydrogen peroxide over ultrafine titanium silicalites-1(TS-1) in a submerged ceramic membrane reactor was developed, which can maintain the in situ removal of ultrafine catalyst particles from the reaction slurry and keep the process continuous.The effects of key operating parameters on the benzene conversion and phenol selectivity, as well as the membrane filtration resistance were examined by single factor experiments. A continuous reaction process was carried out under the obtained optimum operation conditions. Results showed that the system can be continuously and stably operated over 20 h, and the benzene conversion and phenol selectivity kept at about 4% and 91%, respectively. The ceramic membrane exhibits excellent thermal and chemical stability in the continuous reaction process. 展开更多
关键词 Phenol Benzene HYDROXYLATION ts-1 SUBMERGED membranE reactor CERAMIC membranE
下载PDF
Model Study on a Submerged Catalysis/Membrane Filtration System for Phenol Hydroxylation Catalyzed by TS-1 被引量:3
7
作者 陈日志 姜红 +1 位作者 金万勤 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第4期648-653,共6页
This ranearch is focused on the, develonment of a simnle design model of the submerged catalysis/membrane filtration (catalysis/MF) system for phenol hydroxylation over TS-1 based on the material balance of the phen... This ranearch is focused on the, develonment of a simnle design model of the submerged catalysis/membrane filtration (catalysis/MF) system for phenol hydroxylation over TS-1 based on the material balance of the phenol under steady state and the reported kinetic studies. Based on the developed model, the theoretical phenol Conversions at steady state could be calculated using the kinetic parameters obtained from the previous batch experiments. The theoretical conversions are in good agreement with the experimental data obtained in the submerged catalysis/MF system within relative error of ±5%. The model can be used to determine the optimal experimental conditions to carry out the phenol hydroxylation over TS-1 in the submerged catalysis/MF system. 展开更多
关键词 submerged catalysis/membrane filtration system phenol hydroxylation ts-1
下载PDF
Studies of Cyclohexane Catalytic Oxidation Processes over Titanium Silicate-1 Zeolite
8
作者 ChengShibiao WuWei SunBin MinEnze 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2003年第4期51-56,共6页
The catalytic oxidation processes for cyclohexane/H_2O_2/acetone system overthe TS-1 zeolite was studied. Study results have revealed that the cyclohexane conversion was 27%after the reaction proceeded at 100℃ for 2 ... The catalytic oxidation processes for cyclohexane/H_2O_2/acetone system overthe TS-1 zeolite was studied. Study results have revealed that the cyclohexane conversion was 27%after the reaction proceeded at 100℃ for 2 hours at a cyclohexane/H_2O_2 molar ratio of 0.8. Thecyclohexanol/cyclohexanone molar ratio was 1.3 along with a certain amount of organic acids andesters, the formation of which was closely associated with the oxidation of reaction solvent anddeep oxidation of cyclohexanone and cyclohexanol contained in the reaction products. With respect tothe catalytic oxidation of cyclohexane/H_2O_2 system the selection of appropriate solvent wascritically important. 展开更多
关键词 CYCLOHEXANE ts-1 zeolite catalytic oxidation
下载PDF
负载型TS-1沸石膜催化剂的制备、表征及其催化性能研究 被引量:2
9
作者 郭宇 李东昕 +3 位作者 吴红梅 金玉家 周立岱 陈强强 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2017年第6期631-636,共6页
利用水热合成法在α-Al_2O_3陶瓷管表面制备了连续完整的钛硅(TS-1)沸石膜,并且利用该膜催化剂催化丙烯直接环氧化合成环氧丙烷(PO)。采用SEM、XRD、FT-IR和UV-Vis等表征手段及丙烯环氧化反应测试,详细研究了合成液中Ti/Si比对TS-1沸石... 利用水热合成法在α-Al_2O_3陶瓷管表面制备了连续完整的钛硅(TS-1)沸石膜,并且利用该膜催化剂催化丙烯直接环氧化合成环氧丙烷(PO)。采用SEM、XRD、FT-IR和UV-Vis等表征手段及丙烯环氧化反应测试,详细研究了合成液中Ti/Si比对TS-1沸石膜形貌、结构及催化性能的影响。结果表明,合成液中Ti/Si比在0.01~0.04范围内,所合成的TS-1沸石膜均具备典型MFI型拓扑结构。但当Ti/Si比>0.02时,随着Ti/Si比升高,TS-1沸石膜表面沸石颗粒排列变得杂乱,且TS-1沸石沉积量逐渐减少,沸石晶间缺陷增多,丙烯渗透速率增大。而且,当Ti/Si比=0.03、0.04时,由于所合成的TS-1沸石膜中存在大量非骨架钛,导致在丙烯环氧化反应中PO选择性和PO生成速率明显降低。当Ti/Si比为0.02时,合成的TS-1沸石膜骨架钛含量最高,其催化性能最佳,H2O_2转化率、PO选择性和生成速率分别为12.43%、95.80%和15.78 mmol/(h·g)。TS-1沸石膜在丙烯环氧化反应中重复使用8次,其催化性能保持相对稳定。 展开更多
关键词 钛硅沸石 沸石膜 水热合成 环氧丙烷
下载PDF
氧化铝陶瓷管负载TS-1沸石膜的制备及表征 被引量:2
10
作者 郭宇 金玉家 +1 位作者 吴红梅 李东昕 《硅酸盐通报》 CAS CSCD 北大核心 2014年第8期2068-2072,共5页
利用二次晶种生长法在α-Al2O3陶瓷管上制备TS-1沸石膜,详细研究了晶化时间对TS-1沸石膜表面形貌、沸石层厚度、沸石生长速率及气体渗透性能的影响。通过扫描电子显微镜(SEM),X-射线衍射仪(XRD),红外光谱(FTIR)、紫外光谱(UV-Vis)及N2... 利用二次晶种生长法在α-Al2O3陶瓷管上制备TS-1沸石膜,详细研究了晶化时间对TS-1沸石膜表面形貌、沸石层厚度、沸石生长速率及气体渗透性能的影响。通过扫描电子显微镜(SEM),X-射线衍射仪(XRD),红外光谱(FTIR)、紫外光谱(UV-Vis)及N2渗透测试对TS-1沸石膜进行了全面表征。研究结果表明:随着晶化时间的延长,TS-1膜层表面沸石粒子互生性增强,且膜层厚度也随之增加。然而,随着沸石层厚度的增加,其气体传输性能下降。当晶化时间为48 h,沸石生长速率最快,为0.087μm/h,此时TS-1沸石膜厚度为4μm,表面平整,无明显缺陷。 展开更多
关键词 ts-1 沸石膜 氧化铝管 二次晶种生长法
下载PDF
TS-1分子筛膜制备和催化性能的研究
11
作者 朱美华 李羚 +4 位作者 丁文娟 陈乐 李玉琴 桂田 陈祥树 《膜科学与技术》 CAS CSCD 北大核心 2018年第2期45-51,59,共8页
采用二次水热合成法在管状莫来石支撑体上制备TS-1分子筛膜,通过XRD、FT-IR、UV-Vis和SEM表征技术考察二次水热合成法中浸涂支撑体时晶种悬浮液浓度、合成液中的nH_2O_2/nSiO_2比率、合成液中晶种添加量等对TS-1分子筛膜的生长和催化性... 采用二次水热合成法在管状莫来石支撑体上制备TS-1分子筛膜,通过XRD、FT-IR、UV-Vis和SEM表征技术考察二次水热合成法中浸涂支撑体时晶种悬浮液浓度、合成液中的nH_2O_2/nSiO_2比率、合成液中晶种添加量等对TS-1分子筛膜的生长和催化性能的影响.当合成液的摩尔组分比、晶种液浓度、合成液中的nH_2O_2/nSiO_2比率、溶液中晶种添加质量分数、合成温度和合成时间分别为SiO_2∶0.03TiO_2∶0.2TPAOH∶120H_2O、5%、6、1%、150℃和24h时,连续致密的TS-1分子筛膜在H_2O_2氧化异丙醇反应中表现出良好的催化性能.其次,在渗透汽化-催化氧化耦合反应过程中,当异丙醇与H_2O_2摩尔比和反应温度分别为1∶2和70℃时,异丙醇的转化率达到81.14%,TS-1分子筛膜的通量为2.23kg/(m^2·h). 展开更多
关键词 ts-1分子筛膜 H2O2氧化 渗透汽化
下载PDF
TS-1分子筛膜的制备 被引量:1
12
作者 李家栋 仲盛来 林晓 《南京工业大学学报(自然科学版)》 CAS 2008年第4期1-5,共5页
在多孔管状莫来石支撑体外表面水热合成TS-1型分子筛膜.讨论了合成配比、合成温度、晶种引入等因素对膜合成的影响.采用X射线衍射仪(XRD)、红外光谱仪(FT-IR)、紫外可见分光光度计(UV-VIS)和扫描电子显微镜(SEM)对TS-1分子筛及分子筛膜... 在多孔管状莫来石支撑体外表面水热合成TS-1型分子筛膜.讨论了合成配比、合成温度、晶种引入等因素对膜合成的影响.采用X射线衍射仪(XRD)、红外光谱仪(FT-IR)、紫外可见分光光度计(UV-VIS)和扫描电子显微镜(SEM)对TS-1分子筛及分子筛膜进行了表征.通过乙醇-水混合物对膜的渗透汽化分离性能进行检测.结果表明,Ti进入了分子筛的骨架中,且最佳n(TiO2)/n(SiO2)=0.02,最佳合成温度200℃,采用原位法可以获得缺陷较少的TS-1分子筛膜.该膜对乙醇具有较好的选择性,分离因子为62,通量为0.76 kg/(m2.h). 展开更多
关键词 ts-1 分子筛膜 原位法 晶种法 渗透汽化
下载PDF
用于回收酰胺类溶液的TS-1渗透汽化膜的制备和性能测定
13
作者 王亚妮 韶晖 +2 位作者 张琪 徐荣 钟璟 《现代化工》 CAS CSCD 北大核心 2016年第10期134-137,139,共5页
采用晶种法制备了不同Ti含量的TS-1/α-Al_2O_3分子筛膜,并用于渗透汽化回收酰胺类溶液。通过X-射线衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)等对合成的分子筛膜进行表征,结果表明钛原子进入到分子筛骨架。渗透汽化实验... 采用晶种法制备了不同Ti含量的TS-1/α-Al_2O_3分子筛膜,并用于渗透汽化回收酰胺类溶液。通过X-射线衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)等对合成的分子筛膜进行表征,结果表明钛原子进入到分子筛骨架。渗透汽化实验结果显示,TS-1分子筛膜具有较好的分离性能且优先透过有机物,可用于酰胺类有机物的回收利用。n(Ti)/n(Si)为0.015合成的TS-1分子筛膜,在进料温度为65℃,操作压力为300 Pa的条件下,分离质量分数为5%的DMF/H_2O和DMAc/H_2O溶液,渗透通量分别为1.34 kg/(m^2·h)和1.13 kg/(m^2·h),回收后溶液的质量分数提高到19.4%和16.2%。 展开更多
关键词 ts-1分子筛膜 渗透汽化 酰胺类溶液 回收利用
下载PDF
Al_2O_3中空纤维陶瓷膜上TS-1膜的制备 被引量:1
14
作者 梁琦 《黑龙江科技信息》 2014年第12期62-63,共2页
采用相转化纺丝/烧结技术制备Al2O3多孔中空纤维膜,并以此为载体,通过晶种法考察不同晶种诱导条件制备TS-1复合中空纤维膜,并采用扫描电子显微镜、气体渗透性能测试装置等设备对所制备的TS-1复合中空纤维膜进行微观结构及渗透性能的表... 采用相转化纺丝/烧结技术制备Al2O3多孔中空纤维膜,并以此为载体,通过晶种法考察不同晶种诱导条件制备TS-1复合中空纤维膜,并采用扫描电子显微镜、气体渗透性能测试装置等设备对所制备的TS-1复合中空纤维膜进行微观结构及渗透性能的表征。结果表明,晶种法制备的TS-1复合中空纤维膜的N2渗透速率较小,并且表面平整无缺陷,因此该方法适合制备性能优良的TS-1复合中空纤维膜。 展开更多
关键词 AL2O3 中空纤维膜 晶种法 ts-1复合中空纤维膜
下载PDF
Study on Crystallization of Titanium Silicalite Zeolite (Ⅱ)
15
作者 Lin Min Zhu Bin +1 位作者 Shu Xingtian Wang Xieqing (Research Institute of Petroleum Processing, Beijing 100083) 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2009年第1期31-38,共8页
In order to investigate the rules on formation of zeolite during crystallization of titanium silicalite zeolite (TS-1) the X-ray diffractometry and Foulier transform infra-red spectrometry were applied to track the pr... In order to investigate the rules on formation of zeolite during crystallization of titanium silicalite zeolite (TS-1) the X-ray diffractometry and Foulier transform infra-red spectrometry were applied to track the process of crystallization of titanium silicalite zeolite. The research results revealed that at the initial stage of crystallization the interactions between silica gel and titania gel in the polymer blend could gradually lead to the formation of tiny crystal nuclei with complicated structure that could slowly grow up to form molecular sieves. Quite different from the conventional zeolites that use the acid sites as the catalytically active centers, the oxidative reactivity of the titanium silicalite zeolite was not proportional to its crystallinity and is associated with the oxidative centers of titanium contained in the zeolite. 展开更多
关键词 titanium silicalite zeolite ts- 1 hollow titanium silicalite HTS CRYSTALLIZATION CHARACTERIZATION
下载PDF
Aromatic compounds-mediated synthesis of anatase-free hierarchical TS-1 zeolite:Exploring design strategies via machine learning and enhanced catalytic performance 被引量:1
16
作者 Chang’an Wang Guoqing An +9 位作者 Jing Lin Xiaowei Zhang Zhiyuan Liu Yibin Luo Siqi Liu Zhixiang Cheng Tingting Guo Hongyi Gao Ge Wang Xingtian Shu 《Aggregate》 2023年第4期138-151,共14页
Simultaneous achievement of constructing mesopores and eliminating anatase is a long-term pursuit for enhancing the catalytic performance of TS-1.Here,we developed an aromatic compounds-mediated synthesis method to pr... Simultaneous achievement of constructing mesopores and eliminating anatase is a long-term pursuit for enhancing the catalytic performance of TS-1.Here,we developed an aromatic compounds-mediated synthesis method to prepare anatase-free and hierarchical TS-1 for olefin epoxidation.A series of hierarchical TS-1 zeolites were prepared by introducing aromatic compounds containing different functional groups via the crystallization process.The formation of intercrystalline mesopores and insertion of titanium into framework were facilitated at different extent.The synergistic coordination of carboxyl and hydroxyl in aromatic compounds with Ti(OH)4 realizes the uniform distribution of titanium species and eliminates the generation of anatase.Noteworthily,eight machine learning models were trained to reveal the mechanism of additive functional groups and preparation conditions on anatase formation and microstructure optimization.The prediction accuracy of most models can reach more than 80%.Benefiting from the larger mesopore volumes(0.37 cm3⋅g−1)and higher content of framework Ti species,TS-DHBDC-48h samples exhibit a higher catalytic performance than other zeolites,giving 1-hexene conversion of 49.3%and 1,2-epoxyhenane selectivity of 99.9%.The paper provides a facile aromatic compounds-mediated synthesis strategy and promotes the application of machine learning toward the design and optimization of new zeolites. 展开更多
关键词 1-hexene epoxidation aromatic compounds machine learning SELECTIVITY ts-1 zeolites
原文传递
纳米晶种涂层法合成Silicalite-1沸石膜 被引量:9
17
作者 孔春龙 王金渠 +1 位作者 鲁金明 陶凯 《过程工程学报》 EI CAS CSCD 北大核心 2007年第1期71-74,共4页
用纳米晶种涂层二次生长成膜法在大孔旺.A1203(孔径4~6μm)陶瓷管上合成Silicalite-1沸石膜.用X射线衍射(XRD)和扫描电镜(SEM)表征分析了沸石膜的形态,并通过单组分气体渗透实验对合成膜管的渗透性能进行了测试.结果表明,... 用纳米晶种涂层二次生长成膜法在大孔旺.A1203(孔径4~6μm)陶瓷管上合成Silicalite-1沸石膜.用X射线衍射(XRD)和扫描电镜(SEM)表征分析了沸石膜的形态,并通过单组分气体渗透实验对合成膜管的渗透性能进行了测试.结果表明,合成的Silicalite-1沸石膜连续、互生,看不出晶间孔;沸石膜层厚8-10μm;常温常压下HE/N2的理想分离系数为3.9,超过其努森扩散值3.74,H2/C3H8的理想分离系数为19.1,远大于其Knudsen扩散比值4,69,且H2的渗透率达到1.43×10^-6mol/(m^2·s·Pa).气体分离数据表明,该膜没有明显的缺陷存在. 展开更多
关键词 SILICALITE-1 沸石膜 二次生长 气体渗透
下载PDF
堇青石载体表面Silicalite-1沸石膜的合成与表征 被引量:8
18
作者 李军 张建华 龙英才 《化学学报》 SCIE CAS CSCD 北大核心 2000年第4期371-373,共3页
沸石分子筛膜是近十年发展起来的一种新型无机膜.它具备一般无机膜结构稳定、耐高温与化学侵蚀、机械强度高等优点.尤其是,它的结构孔径均匀、精密,具备分子筛分性能.沸石晶体中的阳离子可被其它离子交换.硅铝比可以调节,硅铝原子可被... 沸石分子筛膜是近十年发展起来的一种新型无机膜.它具备一般无机膜结构稳定、耐高温与化学侵蚀、机械强度高等优点.尤其是,它的结构孔径均匀、精密,具备分子筛分性能.沸石晶体中的阳离子可被其它离子交换.硅铝比可以调节,硅铝原子可被其它原子取代.这些特性,使研制孔径与分子尺寸相匹配、均匀致密的沸石分子筛膜,成为实现分子水平上分离和膜催化的关键.这是当前无机膜材料研究的前沿和热点.通常,用于分离与催化的沸石膜是在无机多孔载体上合成的.α-氧化铝是文献报道的制备方法中最常用的载体。 展开更多
关键词 混石膜 堇青石 硅沸石-1 合成 结构
下载PDF
在玻璃上合成有取向的silicalite-1分子筛膜及其生长机理 被引量:10
19
作者 郎林 张宝泉 刘秀凤 《化工学报》 EI CAS CSCD 北大核心 2006年第9期2229-2232,共4页
The growth and orientation of zeolite crystals on a glass substrate was investigated by changing the roughness and setting of the substrate surface.The orientation control of crystals on the glass substrate was achiev... The growth and orientation of zeolite crystals on a glass substrate was investigated by changing the roughness and setting of the substrate surface.The orientation control of crystals on the glass substrate was achieved.It was found that the setting and treatment of the glass substrate had a substantial effect on crystal orientation.When the substrate surface was upward, the preferential growth of crystal was along the a-axis.However, the preferential growth of crystal was along b-axis when the substrate surface was downward.According to experimental results, a film formation mechanism was proposed to account for the growth and orientation of crystals on the glass substrate. 展开更多
关键词 SILICALITE-1 分子筛膜 晶体取向性 生长机理
下载PDF
高性能Silicalite-1分子筛膜的合成 被引量:5
20
作者 陈红亮 李砚硕 +1 位作者 刘杰 杨维慎 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2006年第1期20-22,共3页
Synthesis of high performance Silicalite-1 zeolite membranes on silica tubes was first reported in this paper.After two-step in-situ hydrothermal synthesis,well intergrown Silicalite-1 zeolite membranes were synthesiz... Synthesis of high performance Silicalite-1 zeolite membranes on silica tubes was first reported in this paper.After two-step in-situ hydrothermal synthesis,well intergrown Silicalite-1 zeolite membranes were synthesized on silica tubes after aging at 75 ℃ for 12 h.The Silicalite-1 zeolite membranes were characterized by SEM.The separation performance towards ethanol/water mixtures was evaluated by pervaporation.With temperature increasing,the flux of S-1 membrane,increased from 0.2 kg·m-2·h-1 at 30 ℃ to ca. 1.0 kg·m-2·h-1 at 80 ℃, while the separation factor decreased from 110 to 89.These results showed that silica supports may be more suitable for preparing high performance Silicalite-1 membranes. 展开更多
关键词 二氧化硅陶瓷管 水热合成 Silicalite-1分子筛膜 渗透气化
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部