Adsorption Thermodynamics and Diffusion Kinetics of PXover NaY Zeolite Synthesized by In-S
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化工进展Chemical Industry and Engineering Progress2024 年第 43 卷第 3 期光热响应型控释微球的可控制备及其性能杨嘉琪1,巨晓洁1,2,谢锐1,2,汪伟1,2,刘壮1,2,潘大伟1,2,褚良银1,2(1 四川大学化学工程学院,四川 成都 610065;2 四川大学高分子材料工程国家重点实验室,四川 成都 610065)摘要:单一的光热治疗(PTT )效果有限,往往不能彻底治愈肿瘤。
随着材料科学与生物医学的融合,多功能药物载体材料得到了很好的开发利用,有助于将PTT 与其他治疗方法联合使用,为协同增强抗肿瘤疗效提供了有效的策略。
本研究以载有吲哚菁绿(ICG )的聚乳酸-羟基乙酸共聚物(PLGA )纳米粒子为光热剂,以聚乙烯醇(PVA )/海藻酸钠(SA )为载体基材,采用微流控技术可控制备了一种新型光热响应型控释微球(PLGA-ICG@PVA/SA )。
系统研究了微球的形貌尺寸可控性、光热转化性能、机械性能和生物相容性,并以盐酸阿霉素(DOX )为模型药物,探讨了该微球载体对DOX 的负载能力和光热响应性控释能力。
结果表明,所制备的PLGA-ICG@PVA/SA 微球具有良好的单分散性,表现出优异的光热转换效应,0.5W/cm 2近红外光照射15min 的温度增量为18.5℃且稳定性良好;微球亦具有良好的可压缩性和弹性性能,其杨氏模量为317.0kPa 。
在模拟生理环境中,微球中DOX 药物的释放行为符合一级释放动力学模型并具有明显的光热刺激响应性。
该微球材料在药物控释及肿瘤的光热/化疗联合治疗等领域具有广泛的应用前景。
关键词:微流体学;光热治疗;复合微球;吲哚菁绿;纳米粒子;药物释放;弹性中图分类号:TQ469 文献标志码:A 文章编号:1000-6613(2024)03-1474-10Controllable preparation and properties of photothermal-responsivecontrolled-release microspheresYANG Jiaqi 1,JU Xiaojie 1,2,XIE Rui 1,2,WANG Wei 1,2,LIU Zhuang 1,2,PAN Dawei 1,2,CHU Liangyin 1,2(1 School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China; 2 State Key Laboratory of PolymerMaterials Engineering, Sichuan University, Chengdu 610065, Sichuan, China)Abstract: Single photothermal therapy (PTT) has limited effects and often cannot cure tumors completely. With the integration of material science and biomedicine, multifunctional drug carrier materials have been well developed and utilized, which is conducive to the combined use of PTT with other therapeutic methods, providing an effective strategy for synergistically enhancing antitumor efficacy. In this study, a novel kind of photothermal responsive controlled-release microspheres (PLGA-ICG@PVA/SA) was controllably fabricated by microfluidic technology using poly(lactic-co -glycolic acid) (PLGA) nanoparticles loaded with indocyanine green (ICG) as the photothermal agent and poly(vinyl alcohol) (PVA)/sodium alginate (SA) as the carrier substrate. The morphology and size controllability, photothermal conversion performance, mechanical properties and biocompatibility of microspheres were研究开发DOI :10.16085/j.issn.1000-6613.2023-0374收稿日期:2023-03-13;修改稿日期:2023-04-17。
石 油 炼 制 与 化 工 2021年第52卷zeolite[J].JournalofIndustrialandEngineeringChemistry,2013,19(3):915 919[9] MierD,AguayoAT,GayuboAG,etal.Catalystdiscriminationforolefinproductionbycoupledmethanol?狀 butanecracking[J].AppliedCatalysisA:General,2010,383(1?2):202 210[10]MierD,GayuboAG,AguayoAT,etal.Olefinproductionbycofeedingmethanoland狀 butane:KineticmodelingconsideringthedeactivationofHZSM 5zeolite[J].AIChEJournal,2011,57(10):2841 2853[11]MierD,AguayoAT,GayuboAG,etal.Synergiesintheproductionofolefinsbycombinedcrackingof狀 butaneandmethanolonaHZSM 5zeolitecatalyst[J].ChemicalEngineeringJournal,2010,160(2):760 769[12]WeiShumei,XuYarong,JinZhaoyang,etal.Co conversionofmethanoland狀 hexaneintoaromaticsusingintergrownZSM 5?ZSM 11asacatalyst[J].FrontiersofChemicalScienceandEngineering,2020,14:783 792[13]魏书梅,徐亚荣,李琪蓉,等.甲醇耦合抽余油芳构化反应催化剂制备及其性能研究[J].石油炼制与化工,2021,52(6):11 17[14]常福祥.正己烷与甲醇在分子筛催化剂上耦合反应的机理研究[D].大连:中国科学院大连化学物理研究所,2006[15]SuChang,QianWeizhong,XieQing,etal.ConversionofmethanolwithC5-C6hydrocarbonsintoaromaticsinatwo stagefluidizedbedreactor[J].CatalysisToday,2016,264:63 69犛犜犝犇犢犗犉犜犎犈犆犗犝犘犔犐犖犌犃犚犗犕犃犜犐犣犃犜犐犗犖犗犉犔犐犌犎犜犎犢犇犚犗犆犃犚犅犗犖犛犠犐犜犎犕犈犜犎犃犖犗犔WeiShumei(犚犲狊犲犪狉犮犺犐狀狊狋犻狋狌狋犲狅犳犝狉狌犿狇犻犘犲狋狉狅犮犺犲犿犻犮犪犾犆狅犿狆犪狀狔,犘犲狋狉狅犆犺犻狀犪,犝狉狌犿狇犻830019)犃犫狊狋狉犪犮狋:Undertheconditionsofareactiontemperatureof400℃,areactionpressureof0.50MPa(N2atmosphere),amassspacevelocityof1.0h-1andalighthydrocarbon?methanolmassratioof1∶1,thecouplingaromatizationofmethanolwiththreelighthydrocarbonfeedstocksofreformertoppedoil,aromaticsraffinateoilandreformerpentaneoilwerestudied.Theresultsshowedthattheconversionofmethanolwas100%within72hours.Thecontentofisopentaneinpentaneoilwasthehighestandtheyieldofaromaticsrangedfrom26.30%to35.13%,whilethecontentofisopentaneinthereformertoppedoilwasthelowestandtheyieldofaromaticsrangedfrom24.81%to34.56%inthecouplingaromatizationofmethanolwiththereformertoppedoilduringthereaction.Aromatichydrocarbonswereproducedbyisomerization,aromatization,cyclizationandhydrogentransfer,andalargenumberof狀 alkanesreacted.Whentheraffinateoilreactedwithmethanol,theconversionof狀 pentanewas97.19%,theconversionof狀 hexanewas94.26%,andthemassfractionofaromaticswasincreasedfrom1.56%to39.44%.犓犲狔犠狅狉犱狊:lighthydrocarbon;methanol;coulping;櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫸櫐櫐櫐櫐櫐櫐櫐櫐櫐櫐櫐櫐殾殾殾殾aromatization简 讯碳酸乙烯酯加氢制乙二醇项目通过中试考核和工艺包评审近日,由惠生工程公司、天津大学和华东理工大学联合开发的碳酸乙烯酯加氢合成乙二醇联产甲醇中试项目通过72h连续满负荷运行性能考核和100kta规模基础数据工艺包评审。
5A 分子筛吸附剂技术及其应用进展杜以村(中国石化 南京催化剂有限公司,江苏 南京 211512)[摘要]阐述了5A 分子筛吸附剂的最新技术进展,介绍了国产5A 分子筛吸附剂的工业制备原理,并对5A 分子筛吸附剂的市场前景进行了分析和展望,预期在未来油化一体化的发展趋势下,用于正构烷烃吸附分离装置的5A 分子筛吸附剂具有良好的应用前景。
[关键词]5A 分子筛;吸附剂;正构烷烃;吸附分离[文章编号]1000-8144(2021)06-0604-04 [中图分类号]TQ 424 [文献标志码]AProgress in industrial preparation and application of 5A zeolite adsorbentDu Yicun(Sinopec Nanjing Catalyst Co.,Ltd.,Nanjing Jiangsu 211512,China )[Abstract ]The latest technology development of 5A zeolite adsorbent and the principle of industrial preparation of domestic 5A zeolite adsorbent were mainly reviewed. Besides ,the industrial application of 5A zeolite adsorbent was analyzed ,pointing out that the use of 5A zeolite adsorbent in n -alkane adsorption and separation unit would become more extensive under the tendency of refining and chemical integration in the future.[Keywords ]5A zeolite ;adsorbent ;n -alkanes ;adsorption separationDOI :10.3969/j.issn.1000-8144.2021.06.016[收稿日期]2021-02-15;[修改稿日期]2021-03-09。
化工进展Chemical Industry and Engineering Progress2023 年第 42 卷第 3 期逆水煤气变换反应研究进展王晓月,张伟敏,姚正阳,郭晓宏,李聪明(太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西 太原 030024)摘要:逆水煤气变换(RWGS )反应是将二氧化碳(CO 2)加氢转化为甲醇、低碳烯烃、芳烃以及汽油等高附加值化学品和燃料的关键步骤,对于实现CO 2资源化利用具有重要意义。
本文综述了近年来RWGS 反应的研究进展,包括RWGS 反应热力学分析、催化机理、可选择的催化剂种类以及提升催化剂性能策略等方面。
文章从热力学角度分析,RWGS 反应在高温下有利,而低温下存在甲烷化竞争反应。
RWGS 反应机理主要包括氧化还原机理以及缔合机理,其中缔合机理包括甲酸盐路径和羧酸盐路径等。
相比于其他催化体系,负载型金属催化剂展现出较优异的RWGS 反应性能。
另外,通过添加碱金属助剂、形成双金属合金以及选择合适载体和减小金属颗粒尺寸以优化金属-载体相互作用等手段可实现低温高效稳定的RWGS 反应催化剂的设计开发。
关键词:逆水煤气变换反应;二氧化碳;一氧化碳;热力学;催化剂中图分类号:TQ073 文献标志码:A 文章编号:1000-6613(2023)03-1583-12Research progress of reverse water gas shift reactionWANG Xiaoyue ,ZHANG Weimin ,YAO Zhengyang ,GUO Xiaohong ,LI Congming(State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China)Abstract: Reverse water gas conversion (RWGS) reaction is a key step in the catalytic hydrogenation ofcarbon dioxide (CO 2) to high value-added chemicals and fuels such as methanol, light olefins, aromatics and gasoline, which is of great significance for the utilization of CO 2. This review summarizes the research progress of RWGS reaction in recent years, including thermodynamic analysis of RWGS reaction, catalytic mechanisms, selective catalysts and strategies to improve the performance of catalysts. From the perspective of thermodynamics, RWGS reaction is favorable at high temperature, as methanation reaction emerges at low temperature. The mechanisms of RWGS reaction mainly consist of redox mechanism and association mechanism, and the latter further contains a formate route and/or carboxylate route. Compared with other catalyst system, supported metal catalysts commonly exhibit a superior RWGS reaction performance. In addition, the rational design of RWGS reaction catalysts with high reactivity and durability could be realized by adding alkali metal additives, forming bimetallic alloy as well as modulating the metal-support interaction via selecting a good support or reducing the metal particle size.Keywords: reverse water gas shift reaction; carbon dioxide; carbon monoxide; thermodynamics; catalyst综述与专论DOI :10.16085/j.issn.1000-6613.2022-0816收稿日期:2022-05-05;修改稿日期:2022-07-13。
2022 年第51 卷第 3 期石油化工PETROCHEMICAL TECHNOLOGY·357·利用同步辐射X 射线吸收光谱技术表征Ziegler-Natta 催化剂活性位点的研究进展谢吉嘉,刘月祥(中国石化 北京化工研究院,北京 100013)[摘要]Ziegler-Natta 催化剂是聚烯烃生产的核心,但在原子层面对催化剂结构和聚合机理的认识仍不够清晰。
同步辐射X 射线吸收光谱(XAFS )技术可有效观测催化剂活性中心原子临近壳层的化学结构,辅助探究聚合机理。
综述了利用XAFS 技术对Ziegler-Natta 催化剂进行表征的研究进展,重点关注催化剂各组分对活性中心结构的影响,并对聚合机理的研究进行总结。
[关键词]Ziegler-Natta 催化剂;活性中心;同步辐射;X 射线吸收光谱;烯烃聚合[文章编号]1000-8144(2022)03-0357-06 [中图分类号]TQ 426.94 [文献标志码]AThe active sites characterization of Ziegler -Natta catalysts by synchrotron X -ray absorption spectroscopy :A reviewXie Jijia ,Liu Yuexiang(Sinopec Beijing Research Institute of Chemical Industry ,Beijing 100013,China )[Abstract ]Ziegler-Natta catalyst is the core of polyolefins production ,but the investigation of its chemical structure and polymerization mechanisms at atomic level is still needed to be further improved. Synchrotron X-ray absorption spectroscopy(XAFS) is a technology to evaluate the chemical structures of the neighbor shells of active atoms and can assist the understanding of polymerization mechanisms more in depth. This manuscript reviews the findings by the characterizations of Ziegler-Natta catalysts via XAFS and mainly focuses on the interactions between different compounds of the catalysts.[Keywords ]Ziegler-Natta catalysts ;active sites ;synchrotron ;X-ray adsorption spectroscopy ;olefin polymerization进展与述评DOI :10.3969/j.issn.1000-8144.2022.03.017[收稿日期]2021-09-02;[修改稿日期]2021-11-19。
Al-MCM-41 介孔分子筛吸附喹啉的性能王云芳;步长娟;迟志明;李倩【摘要】在碱性条件下,采用水热晶化法,以偏硅酸钠为硅源,铝酸钠为铝源,CTAB 为结构模板剂,成功合成出了含铝介孔分子筛 Al-MCM-41.采用 XRD、BET 等手段对合成的 Al-MCM-41 进行表征,对柴油中的氮化物喹啉进行了吸附实验,考察了Al-MCM-41 介孔分子筛对氮化物喹啉的吸附能力,探究了硅铝比为 60 的 Al-MCM-41分子筛对喹啉溶液吸附的热力学和动力学行为,测得 353.15~393.15 K 温度范围内的吸附等温线数据,用Langmuir、Freundlich 方程对此进行拟合,并根据热力学原理计算得到吸附过程中的ΔH、ΔG、ΔS 值和吸附表观活化能.结果表明, 硅铝比为 60 的 Al-MCM-41 具有较大的孔容、比表面积和较窄的孔径分布,结晶度和有序性高.等温吸附平衡符合 Freundlich 等温线模型,其ΔH = ?0.7682 kJ·mol?1,ΔG = ?28.1215 kJ·mol?1, ΔS = 73.2434 J·mol?1·K?1,吸附动力学符合Pseudo 拟二级方程,Ea 为2.8575 kJ·mol?1.%Under basic conditions, Al-containing mesoporous zeolite Al-MCM-41 was successfully synthesized by hydrothermal synthesis method using sodium metasilicate as silica source, sodium aluminate as alumina source and CTAB as templating agents. XRD and BET were used to investigate the characterization of Al-MCM-41. The adsorptive capacity of this mesoporous zeolite for quinolone was analyzed through adsorption experiment for the nitrogen compounds in diesel in a continuous fixed bed reactor. The thermodynamic performance of the adsorption process was investigated in the range from 353.15 K to 393.15 K. Langmuir and Freundlich isothermal adsorption models were employed to fit the experimental data. The results ofcharacterization showed that Al-MCM-41 with Si/Al = 60 had larger pore volume, specific surface area and narrow pore distribution. The mesoporous molecular sieve had good crystallization degree and ordered pore structure. The adsorption of quinoline on zeolite Al-MCM-41 withSi/Al = 60 was in accordance with the Freundlich isothermal adsorption model. The thermodynamic parameters, such as ΔH, ΔG, ΔS and apparent activation energy, were calculated to be?0.7682 kJ·mol?1, ?28.1215 kJ·mol?1, 73.2434 J·mol?1·K?1 and 2.8575 kJ·mol?1, respec tively. Pesto-second order rate equation was better to describe adsorption of quinolone.【期刊名称】《化工学报》【年(卷),期】2015(066)009【总页数】8页(P3597-3604)【关键词】MCM-41介孔分子筛;表征;喹啉;吸附;热力学;动力学【作者】王云芳;步长娟;迟志明;李倩【作者单位】中国石油大学化学化工学院化学工程系,山东青岛 266580;中国石油大学化学化工学院化学工程系,山东青岛 266580;中国石油工程建设公司华东设计分公司,山东青岛 266071;中国石油工程建设公司华东设计分公司,山东青岛266071【正文语种】中文【中图分类】TQ424Key words:mesoporous molecular sieve Al-MCM-41; characterization; quinoline; adsorptive; thermodynamics; kinetics随着世界范围内化石燃料尤其是石油用量的不断增加,汽柴油的需求量急增,国内炼厂生产柴油的原料中催化柴油和焦化柴油占很大的比重,并且一般还会加入渣油、焦化馏分油、脱沥青油等类型的劣质油品[1]使得成品柴油质量较差,S、N等杂质含量大大增加,芳烃含量较高,十六烷值较低,密度较大。
第49卷第6期2021年6月硅酸盐学报Vol. 49,No. 6June,2021 JOURNAL OF THE CHINESE CERAMIC SOCIETY DOI:10.14062/j.issn.0454-5648.20200792 托贝莫来石改性及其对亚甲基蓝的吸附性能王志增1,李通1,赵秦仪1,王冬云1,崔晓昱2,崔崇1(1. 南京理工大学材料科学与工程学院,南京 210094;2. 浙江中劲环保科技有限公司,浙江宁波 315105)摘要:对托贝莫来石(TOB)进行加热与酸化复合改性,成功制备出比表面积为570 m2/g的酸化改性托贝莫来石(AHTOB),并用X射线衍射、N2吸附-脱附对改性托贝莫来石进行了结构表征和表面积及孔径分析。
通过静态吸附实验探讨了3种吸附剂对亚甲基蓝溶液(MB)的吸附性能,分析改性TOB对MB的吸附机制。
考察了不同吸附剂及其加入量、溶液pH值、MB 初始浓度、吸附时间及温度对吸附行为的影响,研究了AHTOB对MB溶液吸附的热力学和动力学行为。
结果表明:对50 mL,浓度为10 mg/L的MB进行吸附,未改性TOB、热改性HTOB以及酸化改性AHTOB对MB的吸附率分别达到50、53.72%和97.35%。
对于不同初始浓度的MB,TOB和HTOB的最大吸附量可达102.36 mg/g和113.80 mg/g,AHTOB 的吸附量达到248.01 mg/g,经过加热与酸化复合改性的AHTOB对MB的吸附效率有了明显的提升,得到了吸附MB溶液的最佳外界条件:pH值为5~7,震荡时间为30 min,温度为20~25 ℃。
关键词:托贝莫来石;亚甲基蓝;废水;改性;吸附中图分类号:TQ170.1 文献标志码:A 文章编号:0454–5648(2021)06–1185–10网络出版时间:2021-04-06Adsorption of Methylene Blue by Modified TobermoriteWANG Zhizeng, LI Tong1, ZHAO Qinyi1, WANG Dongyun1, CUI Xiaoyu2, CUI Chong1(1. School of Materials Science & Engineering, Nanjing University of Science & Technology, Nanjing 210094, China;2. Zhejiang Zhong Jin Environmental Protection Technology Co., Ltd Ningbo 315105, Zhejiang, China)Abstract: Modified tobermorillonite (AHTOB) with a specific surface area of 570m2/g was prepared by heating and acidification of tobermorillonite (TOB). The structure and specific surface area and pore size of the modified tobermorillonite were characterized by X-ray diffraction and N2 adsorption–desorption. The adsorption properties of three adsorbents on methylene blue solution (MB) were investigated by static adsorption experiments, and the adsorption mechanism of modified TOB on MB was analyzed. The effects of adsorbents, solution pH value, initial MB concentration, adsorption time, and temperature on the adsorption behavior were investigated, and the thermodynamic and kinetic behaviors of AHTOB adsorbed on MB solution were investigated. The adsorption of MB was analyzed in 50 mL of MB at a concentration of 10 mg/L. The results show that the adsorption rates of unmodified TOB, HTOB, and AHTOB on MB are 50.00%, 53.72%, and 97.35%, respectively. At different initial concentrations of MB, the maximum adsorption capacities of TOB and HTOB are 102.36mg/g and 113.80mg/g, and the adsorption capacity of AHTOB on MB is 248.01 mg/g. The adsorption efficiency of AHTOB modified by heating and acidification compound is improved. The optimal conditions for adsorption are pH value of 5–7, shaking time of 30 min, and temperature of 20–25 °C.Keywords: tobermorite; methylene blue; waste water; modification; adsorption染料废水是有害工业污水之一,主要来源于染料及染料中间体生产行业,由各种产品和中间体结晶的母液、生产过程中流失的物料及冲刷地面的污水等组成[1]。