检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2023年第3期55卷 165-172页

作者： zhenzhou ma Xu Hou Bochong Chen Liu Zhao Enxian Yuan Tingting Cui School of Chemical Engineering Changchun University of TechnologyChangchun 130012China Advanced Institute of materials Science Changchun University of TechnologyChangchun 130012China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Department of Chemistry Tsinghua UniversityBeijing 100084China

Since paraffins catalytic cracking was of significant importance to light olefins and aromatics production,this work was intended to gain insights into the feature and model of coke formation and catalyst deactivation in n-heptane catalytic cracking over HZSM-5 zeolites. 18 tests of n-heptane catalytic cracking were designed and carried out over HZSM-5 zeolites in a wide range of operating conditions. A particular attention was paid to the measurement of the conversion, product distribution, coke content, and the porosity and acidity of the fresh and spent HZSM-5 zeolites. It was found that alkene and aromatic promoted coke formation, and it reduced the pore volume and acid site of HZSM-5 zeolites, tailoring its performance in n-heptane catalytic cracking. The specific relationship between HZSM-5 zeolites, n-heptane conversion, product distribution and coke formation was quantitively characterized by the exponential and linear function. Based on the reaction network, the coupled scheme of coke formation and catalyst deactivation were specified for n-heptane catalytic cracking. The dual-model was proposed for the process simulation of n-heptane catalytic cracking over HZSM-5 zeolites. It predicted not only the conversion and product distribution but also coke content with the acceptable errors.

关键词： n-Heptane HZSM-5 Catalytic cracking Coke Deactivation Dual-model

Role of Heating Condition in Polyethylene Behaviors under Nitrogen and Air Atmosphere

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 27-35页

作者： Zhao Liu Hou Xu ma zhenzhou Chen Bochong Yuan Enxian Cui Tingting School of Chemical Engineering Changchun University of TechnologyChangchun 130012 Advanced Institute of materials Science Changchun University of TechnologyChangchun 130012 School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002 Department of Chemistry Tsinghua UniversityBeijing 100084

Recycle of plastic waste is an indisputable means to alleviate both environment and energy *** this work,effects of heating condition on polyethylene behaviors in nitrogen and air were *** was observed that polyethylene behavior was a single step in nitrogen,while the multiple steps occurred in *** to the weight loss and heat flow curves,polyethylene behaviors in air were divided into three regions:low-temperature( 380 ℃) *** analysis revealed that the partial oxidization took the dominance in the low-temperature region,which seldom formed CO and CO_(2);the combustion took the dominance in the middle-temperature region,which was positive to the formation of CO and CO_(2);the pyrolysis was initiated and enhanced in the high-temperature region,which inhibited the formation of CO and CO;.According to the kinetic simulation,a synergistic effect between the pyrolysis and combustion was proposed to account for the acceleration of polyethylene *** work may provide useful information about polyethylene behaviors under heating condition,and help to design and optimize plastic waste incineration process.

关键词： polyethylene heating condition partial oxidation combustion pyrolysis kinetic analysis

Effects of Operating Conditions on the Catalytic Performance of HZSM-5 Zeolites in n-Pentane Cracking

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 67-75页

作者： Hou Xu Zhao Liu ma zhenzhou Chen Bochong Feng Jingyuan Cui Tingting School of Chemical Engineering Changchun University of TechnologyChangchun 130012 Advanced Institute of materials Science Changchun University of TechnologyChangchun 130012 Department of Chemistry Tsinghua UniversityBeijing 100084

In this work,n-pentane catalytic cracking over HZSM-5 zeolites was studied at 650°C under atmosphere pressure.A particular attention was paid to the measurement of n-pentane conversion,light olefins production,product distribution,coke deposit,*** indexes were defined to evaluate the effects of operating conditions on the catalytic performance of HZSM-5 *** was found that decreasing the weight hourly space velocity,increasing the reactant partial pressure,and increasing the carrier gas flow rate could inhibit C-H bond breaking and enhance the C-C bond breaking and hydride transfer reactions,leading to reduced alkenes selectivity,which suppressed the formation of external coke and alleviated the deactivation of HZSM-5 *** was deduced that the catalytic stability of HZSM-5 zeolites was improved at the cost of alkenes *** with decreasing the weight hourly space velocity and increasing the reactant partial pressure,increasing the carrier gas flow rate could enhance the diffusion process and protect alkenes from being consumed in coke formation in order to improve the catalytic stability of HZSM-5 zeolites with less reduction of alkenes selectivity.

关键词： operating conditions HZSM-5 zeolites catalytic performance n-pentane cracking light olefins

Empirical modeling of normal/cyclo-alkanes pyrolysis to produce light olefins

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第2期35卷 389-398页

作者： Xu Hou Bochong Chen zhenzhou ma Jintao Zhang Yuanhang Ning Donghe Zhang Liu Zhao Enxian Yuan Tingting Cui School of Chemical Engineering Changchun University of TechnologyChangchun 130012China Advanced Institute of materials Science Changchun University of TechnologyChangchun 130012China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Department of Chemistry Tsinghua UniversityBeijing 100084China

Due to the complexity of feedstock,it is challenging to build a general model for light olefins *** work was intended to simulate the formation of ethylene,propene and 1,3-butadiene in alkanes pyrolysis by referring the effects of normal/***,the pyrolysis of n-pentane,n-hexane,n-heptane,n-octane,n-nonane,n-decane,cyclohexane,methylcyclohexane,n-hexane and cyclohexane mixtures,and n-heptane and methylcyclohexane mixtures were carried out at 650–800℃,and a particular attention was paid to the measurement of ethylene,propene and 1,***,pseudo-first order kinetics was taken to characterize the pyrolysis process,and the effects of feedstock composition were *** was found that chain length and cyclo-alkane content can be qualitatively and quantitively represented by carbon atom number and pseudo-cyclohexane content,which made a significant difference on light olefins ***,the inverse proportional/quadratic function,linear function and exponential function were proposed to simulate the effects of chain length,cycloalkane content and reaction temperature on light olefins formation,*** the obtained empirical model well reproduced feedstock conversion,ethylene yield and propene yield in normal/cycloalkanes pyrolysis,it exhibited limitations in simulating 1,3-butadiene ***,the accuracy and flexibility of the present model was validated by predicting light olefins formation in the pyrolysis of multiple hydrocarbon *** prediction data well agreed with the experiment data for feedstock conversion,ethylene yield and propene yield,and overall characterized the changing trend of 1,3-butadiene yield along with reaction temperature,indicating that the present model could basically reflect light olefins production in the pyrolysis process even for complex feedstock.

关键词： Empirical model Normal-alkane Cyclo-alkane Pyrolysis Light olefins

HZSM-5 zeolites undergoing the high-temperature process for boosting the bimolecular reaction in n-heptane catalytic cracking

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第2期66卷 136-144页

作者： Chenggong Song zhenzhou ma Xu Hou Hao Zhou Huimin Qiao Changchang Tian Li Yin Baitang Jin Enxian Yuan School of Chemical Engineering Changchun University of TechnologyChangchun130012China Department of Chemical and Biomolecular Engineering North Carolina State UniversityRaleighNC 27606USA School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou225009China

High-temperature treatment is key to the preparation of zeolite ***,the effects of hightemperature treatment on the property and performance of HZSM-5 zeolites were studied in this work.X-Ray diffraction,N2physisorption,27Al magic angle spinning nuclear magnetic resonance(maS NMR),and temperature-programmed desorption of ammonia results indicated that the hightemperature treatment at 650℃ hardly affected the inherent crystal and texture of HZSM-5zeolites but facilitated the conversion of framework Al to extra-framework Al,reducing the acid site and enhancing the acid ***,the high-temperature treatment improved the performance of HZSM-5 zeolites in n-heptane catalytic cracking,promoting the conversion and light olefins yield while inhibiting coke *** on the kinetic and mechanism analysis,the improvement of HZSM-5 performance caused by high-temperature treatment has been attributed to the formation of extra-framework Al,which enhanced the acid strength,facilitated the bimolecular reaction,and promoted the entropy change to overcome a higher energy barrier in n-heptane catalytic cracking.

关键词： HZSM-5 n-Heptane Catalytic cracking High-temperature treatment Extra-framework Al

混凝土/花岗岩界面动态断裂性能的轴拉试验研究

在线全文

学校读者我要写书评

暂无评论

振动与冲击 2019年第11期38卷 152-158页

作者：钟红马振洲胡少伟范向前中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100048 大连理工大学海岸和近海工程国家重点实验室辽宁大连116024 河北渤海投资集团有限公司沧州061113 南京水利科学研究院南京210024 水文水资源与水利工程科学国家重点实验室南京210098

为研究混凝土和花岗岩界面断裂的加载应变率效应,利用MTS试验机对带有双边预制裂缝的花岗岩试件、混凝土试件和混凝土/花岗岩复合试件等三种试件进行了轴向拉伸试验。通过裂缝张开口位移进行控制,获得了不同应变率(10'6~10-3 s")下的荷... 详细信息

为研究混凝土和花岗岩界面断裂的加载应变率效应,利用MTS试验机对带有双边预制裂缝的花岗岩试件、混凝土试件和混凝土/花岗岩复合试件等三种试件进行了轴向拉伸试验。通过裂缝张开口位移进行控制,获得了不同应变率(10'6~10-3 s")下的荷载-裂缝张开口位移曲线,据此计算了荷载上升段的吸能能力,并基于结构动力分析和断裂力学、界面力学理论获得了试件的断裂韧度;结果表明,三类试件的断裂面形态随着应变率的变化呈现不同的特征,三者的峰值荷载、吸能能力和断裂韧度均随应变率的提高而增加。对三类试件断裂特性在中低应变率范围内的率效应机理进行了分析,对比了准脆性材料界面断裂与母材断裂率效应的异同。

关键词：轴向拉伸试验界面断裂峰值荷载吸能能力断裂韧度

社会预期与政策干预对经济风险形成的作用机理研究

在线全文

学校读者我要写书评

暂无评论

管理评论 2013年第4期25卷 3-11页

作者：马振洲刘源张中国科学院大学管理学院北京100190 航天信息股份有限公司北京100195 中国科学院数学与系统科学研究院北京100190

本文着重研究了社会预期和政策干预对经济风险形成的作用机理、作用路径、应对方式、基本特征、相互关系。将非理性预期按照行为主体分为社会大众的非理性预期和利益集团的利用操纵两类,它们都会诱发波动的加剧和波及范围的扩张。有效... 详细信息

本文着重研究了社会预期和政策干预对经济风险形成的作用机理、作用路径、应对方式、基本特征、相互关系。将非理性预期按照行为主体分为社会大众的非理性预期和利益集团的利用操纵两类,它们都会诱发波动的加剧和波及范围的扩张。有效的政策干预通过对波动源作用的抑制、对非理性预期的引导和对利益集团利用操纵的限制打击等手段,起到防范风险的作用。在政策缺失或干预不当的条件下,则会加剧非理性预期和利益集团的炒作、操纵,诱发"共振",导致风险的发生。政府、社会大众和利益集团之间的关系是博弈关系,政府必须注重策略的运用,重点扼制利益集团的利用操纵。

关键词：经济风险经济风险形成机理社会预期政策干预

混凝土/花岗岩界面Ⅰ-Ⅱ复合型动态断裂试验研究

在线全文

学校读者我要写书评

暂无评论

振动与冲击 2021年第4期40卷 277-282页

作者：马振洲钟红陈育志王小乐河北渤海投资集团有限公司河北沧州061113 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100048 金陵科技学院建筑工程学院南京211169

为研究混凝土/岩石界面在复合型应力条件下的动态断裂性能,考虑四种应变率(10-5~10-2 s-1)及三种模态(21.8°,41.7°和60.3°)工况,对混凝土/花岗岩复合试件进行了四点剪切试验,获得了荷载与裂缝张开位移及裂缝剪切位移的关系曲线;结合... 详细信息

为研究混凝土/岩石界面在复合型应力条件下的动态断裂性能,考虑四种应变率(10-5~10-2 s-1)及三种模态(21.8°,41.7°和60.3°)工况,对混凝土/花岗岩复合试件进行了四点剪切试验,获得了荷载与裂缝张开位移及裂缝剪切位移的关系曲线;结合界面力学理论和结构动力分析得到了界面Ⅰ型和Ⅱ型动态应力强度因子,据此得到并分析了断裂韧度、应变能释放率的率相关性及模态比相关性。结果表明:在所研究的应变率和模态角范围内,同一时刻的裂缝张开位移均大于裂缝剪切位移;Ⅰ型和Ⅱ型断裂韧度均随应变率的提高而增加,Ⅰ型断裂韧度随模态角的增大而减小,Ⅱ型断裂韧度随模态角的增大而增加;应变能释放率随应变率和模态角的增加均呈现出增长趋势。

关键词：混凝土/岩石界面应变率四点剪切试验断裂韧度应变能释放率模态角

在线全文

学校读者我要写书评

暂无评论

烃类热裂解和催化裂解技术的研究进展

石油学报（石油加工） 2024年第6期40卷 1677-1694页

作者：田畅畅马振洲尹丽侯旭长春工业大学化学工程学院吉林长春130012 长春工业大学材料科学高等研究院吉林长春130012

烃类热裂解和催化裂解技术的发展,有助于提高石油资源的利用率,满足日益增长的石油化工产品需求。介绍了烃类裂解技术的研究现状,总结了热裂解和催化裂解的技术特点。阐述了烃类热裂解反应机理、烃类热裂解过程模拟、金属氧化物和分子... 详细信息

烃类热裂解和催化裂解技术的发展,有助于提高石油资源的利用率,满足日益增长的石油化工产品需求。介绍了烃类裂解技术的研究现状,总结了热裂解和催化裂解的技术特点。阐述了烃类热裂解反应机理、烃类热裂解过程模拟、金属氧化物和分子筛催化剂特性、以及烃类催化裂解过程模拟等研究进展。重点分析了烃分子结构与热裂解反应的构效关系、分子筛催化剂与烃类催化裂解的构效关系。归纳总结了石油烃热裂解、催化裂解技术的核心问题及未来研究方向,为改善烃类热裂解、催化裂解制石油化工产品工艺提供理论基础。

关键词：烃类热裂解催化裂解反应机理过程模拟

在线全文

学校读者我要写书评

暂无评论

超高频RFID标签一致性的近场检测技术

电子技术应用 2013年第4期39卷 62-64页

作者：童廷洋马振洲航天信息股份有限公司北京100195

超高频RFID标签一致性直接影响RFID系统中采集数据的识别率和准确率。采用接收信号强度指示RSSI(Received Signal Strength Indicator)技术及数理统计,采集标签反射信号强度,设定标准差阈值,作为标签一致性检测参数。研制弯折偶极子近... 详细信息

超高频RFID标签一致性直接影响RFID系统中采集数据的识别率和准确率。采用接收信号强度指示RSSI(Received Signal Strength Indicator)技术及数理统计,采集标签反射信号强度,设定标准差阈值,作为标签一致性检测参数。研制弯折偶极子近场天线,实现0.1 mm近距离标签识读。利用屏蔽效应,在全自动卷筒式RFID标签套装上设置打点标识机构,对标签批量标记,可实现对柔性超高频RFID标签的高速、批量一致性检测。

关键词：射频识别标签一致性超高频近场接收信号强度指示超高频检测