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Hydrogenation of CO_(2) to p-xylene over ZnZrO_(x)/hollow tubular HZSM-5 tandem catalyst

Journal of Energy Chemistry 2024年第12期99卷 725-737页

作者： Haifeng Tian Zhiyu Chen Haowei Huang Fei Zha Yue Chang Hongshan Chen College of Chemistry&Chemical Engineering Northwest Normal UniversityLanzhou 730070GansuChina Key Laboratory of Eco-functional polymer Materials of the Ministry of Education Lanzhou 730070GansuChina College of physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070GansuChina

The conversion of CO_(2) into specific aromatics by modulating the morphology of zeolites is a promising ***-5 zeolite with hollow tubular morphology is *** morphology of zeolite was precisely controlled,and the acid sites on its outer surface were passivated by steam-assisted crystallization method,so that the zeolite exhibits higher aromatic selectivity than sheet HZSM-5 zeolite and greater p-xylene selectivity than chain HZSM-5 *** tandem catalyst was formed by combining hollow tubular HZSM-5 zeolites with ZnZrO_(x)metal *** para-selectivity of p-xylene reached 76.2%at reaction temperature of 320℃,pressure of 3.0 Mpa,and a flow rate of 2400 mL g^(-1)h^(-1)with an H_(2)/CO_(2) molar ratio of 3/*** research indicates that the high selectivity of p-xylene is due to the pore structure of hollow tubular HZSM-5 zeolite,which is conducive to the formation of ***,the passivation of the acid site located on the outer surface of zeolite effectively prevents the isomerization of *** reaction mechanism of CO_(2) hydrogenation over the tandem catalyst was investigated using in-situ diffuse reflectance Fourier transform infrared spectroscopy and density functional *** results showed that the CO_(2) to p-xylene followed a methanol-mediated route over ZnZrO_(x)/hollow tubular HZSM-5 tandem *** addition,the catalyst showed no significant deactivation in the 100 h stability *** present study provides an effective strategy for the design of catalysts aimed at selectively preparing aromatics through CO_(2)hydrogenation.

关键词： Hollow tubular HZSM-5 zeolite Tandem catalyst CO_(2)hydrogenation p-xylene Reaction mechanism

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Toluene Alkylation with Methanol to p-xylene over Heteropoly Acids Supported by Clay

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Journal of Natural Gas Chemistry 2007年第1期16卷 42-45页

作者： V.V.Bokade S.S.Deshpande R.patil S.Jain G.D.Yadav Catalysis Division National Chemical LaboratoryPune-411008India University Institute of Chemical Technology Mumbai-19India

The alkylation of toluene with methanol for the selective formation of p-xylene was systematically studied. Very few studies have been reported on the use of superacids such as heteropolyacids on cheap supports, such as clay. This article deals with the use of different heteropoly acids （HpAs）, viz, Dodeca-Tungstophosphoric acid [***2O] （TpA）, Dodeca-Molyhdo phosphoric acid ammonium salt hydrate [H12Mo12N3O40p＋aq] （DMAA）, Dodeca-Molyhdo phosphoric acid （pMA） on clay （MontmoriUonite, K-10） and as such plain clay. This comparative study reveals that 20%pMA/Clay shows 62% toluene conversion and 100% selectivity toward p-xylene.

关键词： toluene methanol p-xylene heteropoly acid clay

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Toluene Alkylation to Selective Formation of p-xylene over Co-Crystalline ZSM-12/ZSM-5 Catalyst

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Journal of Natural Gas Chemistry 2007年第1期16卷 37-41页

作者： p.N.Joshi p.S.Niphadkar p.A.Desai R.patil V.V.Bokade Catalysis Division National Chemical LaboratoryPune-411008India

The alkylation of toluene with methanol to selective formation of p-xylene has been systematically studied. ZSM-12 （MTW）/ZSM-5 co-crystalline zeolite in 40：60 proportions have been synthesized by the same molar gel composition, but at different temperatures and periods than that of ZSM-12 and ZSM-5, separately. All the prepared samples are characterized by XRD, SEM, BET, and XRF. The activity of toluene alkylation was investigated with a mixture of toluene and methanol as a feed over the ZSM-12, ZSM-12/ZSM-5 co-crystalline, ZSM-5, and physical mixture of ZSM-12/ZSM-5. From characterization, it is observed that the ZSM-12/ZSM-5 co-crystalline material is different from that of ZSM-12, ZSM-5, and their physical mixture. Further, the ZSM-12/ZSM-5 co-crystalline zeolite produces the highest content of xylene and has better selectivity for p-xylene than ZSM-12, ZSM-5, and their physical mixture.

关键词： ZSM-12 ZSM-5 co-crystalline toluene alkylation p-xylene

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Highly Efficient Adsorption of p-xylene from Aqueous Solutions by Hierarchical Nanoporous Biochar Derived from Crab Shell

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Journal of Renewable Materials 2021年第10期9卷 1741-1755页

作者： Yingna Chen Hailong Zhang Jian Guo Lu Cai Yaning Wang Xinxin Yao Wendong Song Lili Ji College of Food and Medical Zhejiang Ocean UniversityZhoushan316022China National-Local Joint Engineering Laboratory of Harbor Oil&Gas Storage&Transportation Technology School of Petrochemical Engineering&EnvironmentZhejiang Ocean UniversityZhoushan316022China Donghai Science and Technology College Zhejiang Ocean UniversityZhoushan316000China Institute of Innovation&Application Zhejiang Ocean UniversityZhoushan316022China College of Naval Architecture and Mechanical-Electrical Engineering Zhejiang Ocean UniversityZhoushan316022China College of petrochemical and Energy Engineering Zhejiang Ocean UniversityZhoushan316022China

The global consumption of p-xylene(pX)for the production of polymers has raised serious concerns about its impact on the *** various reports have shown the risks that pX could pose to human health,research into cost-effective remedial methods to remove pX from the environment has gained *** this work,a hierarchical porous crab shell biochar(KCS)was synthesized,characterized,and evaluated for its efficiency to remove pX from aqueous *** characterizations of KCS,including the porous structure,surface functional group,phase structure,and surface morphology,were discussed by N_(2) adsorption-desorption,FTIR,XRD,and *** adsorption experiments showed that the maximum adsorption capacity of pX on KCS was 393 mg/g within 5 min,larger than most biological/biomass materials,mainly due to the higher specific surface area of 2046 m^(2)/g,and abundant lipophilic functional *** adsorption kinetics study indicated a pseudo-second-order model which implied that the adsorption of pX was due to *** parameters showed that the values ofΔH°andΔG°were both negative,indicating that the pX adsorption process on KCS was spontaneous and *** performance of KCS in delivering a cost-effective,fast,and efficient solution for the removal of pX from aqueous solution would greatly benefit current environmental remediation efforts.

关键词： Crab shell porous biochar p-xylene adsorption wastewater

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Facile synthesis of hypercrosslinked resin via photochlorination of p-xylene and succedent alkylation polymerization

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Chinese Chemical Letters 2011年第9期22卷 1115-1118页

作者： Ling Ling Bai Yong Hao Zhou Xiu Li Wang Si Guo Yuan Xian Li Wu School of Chemical Engineering and Energy Zhengzhou University Zhengzhou 450001 China

A combination of photochlorination ofp-xylene and succedent Friedel-Crafts alkylation polymerization was firstly used in the preparation of the hypercrosslinked adsorptive resin. The data of GC-MS and GC showed that a series of chlorizates were produced when p-xylene was photochlorinated. Hypercrosslinked resins could be synthesized by copolymerization, self-polymerization of chlorizates or post crosslinking reaction. The chemical structure and micromorphology of the porous resins were characterized by BET, FF-IR, SEM and elementary analysis （EA）. The results showed that the novel adsorptive resins possess high BET surface near to 1038 m^2/g and large pore volumes range from 0.5 to 1.2 cm^3/g.

关键词： Hypercrosslinked resin Synthesis p-xylene photochlorination polymerization

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Renewable p-xylene production by Co-catalytic pyrolysis of Cellulose and Methanol

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Chinese Journal of Chemical physics 2018年第6期31卷 843-850,734页

作者： Chi Tang Li-juan Zhu Ming-hui Fan Quan-xin Li Department of Chemical physics Key Laboratory of Urban Pollutant Conversion Chinese Academy of Sciences Anhui Key Laboratory of Biomass Clean Energy University of Science and Technology of China Hefei 230026 China Anhui Key Laboratory of Tobacco Chemistry Anhui Tobacco Industrial. Co. Ltd. Hefei 230088 China

This work developed a one-step process for renewable p-xylene production by co-catalytic fast pyrolysis (co-CFp) of cellulose and methanol over the different metal oxides modified ZSM5 catalysts. It has been proven that La2O3-modified ZSM5(80) catalyst was an effective one for the production of biobased p-xylene. The selectivity and yield of p-xylene strongly depended on the acidity of the catalysts, reaction temperature, and methanol content. The highest p-xylene yield of 14.5 C-mol% with a p-xylene/xylenes ratio of 86.8% was obtained by the co-CFp of cellulose with 33wt% methanol over 20%La2O3-ZSM5(80) catalyst. The deactivation of the catalysts during the catalytic pyrolysis process was investigated in *** reaction pathway for the formation of p-xylene from cellulose was proposed based on the analysis of products and the characterization of catalysts.

关键词： Cellulose p-xylene Catalytic fast pyrolysis La2O3-modified ZSM5

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Isobaric Vapor-Liquid Equilibrium of Binary Systems： p-xylene ＋（Acetic Acid, Methyl Acetate and n-propyl Acetate） and Methyl Acetate ＋ n-propyl Acetate in an Acetic Acid Dehydration process

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Chinese Journal of Chemical Engineering 2013年第2期21卷 171-176页

作者： HUANG Xiuhui ZHONG Weimin pENG Changjun QIAN Feng Key Laboratory of Advanced Control and Optimization for Chemical processes Ministry of Education East China University of Science and Technology Shanghai 200237 China

The vapor-liquid equilibrium data of four binary systems (acetic acid +p-xylene, methyl acetate +n-propyl acetate, n-propyl acetate +p-xylene and methyl acetate +p-xylene) are measured at 101.33 kpa with Ellis equilibrium still, and then both the NRTL and UNIQUAC models are used in combination with the HOC model for correlating and estimating the vapor-liquid equilibrium of these four binary systems. The estimated binary VLE results using correlated parameters agree well with the measured data except the methyl acetate +p-xylene system which easily causes bumping and liquid rushing out of the sampling tap due to their dramatically different boiling points. The correlation results by NRTL and UNIQUAC models have little difference on the average absolute deviations of temperature and composition of vapor phase, and the results by NRTL model are slightly better than those by UNIQUAC model except for the methyl acetate +n-propyl acetate system, for which the latter gives more accurate correlations.

关键词： vapor-liquid equilibrium p-xylene acetic acid methyl acetate n-propyl acetate parameter correlation

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VApOR-LIQUID EQUILIBRIUM FOR TERNARY MIXTURES OF BENZENE,TOLUENE,AND p-xylene

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Chinese Journal of Chemical Engineering 1993年第1期1卷 49-53页

作者：金彰礼胡爱宝刘昆元

Vapor-liquid equilibrium composition and temperature were measured for binary andternary mixtures of benzene,toluene and p-xylene at 101.33 kpa The equilibrium cell of *** modified for the present *** experimental vap... 详细信息

关键词： benzene toluene and p-xylene system vapor-liquid equilibrium equilibrium cell

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用介观动力学模拟pluronic L64／水／p—xylene体系的相分离

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化学学报 2001年第12期59卷 2093-2098页

作者：郭森立侯廷军徐筱杰北京大学化学与分子工程学院

用介观动力学在介观层次上对不同组分的pluronic L64/水/p-xylene三元体系的相分离进行了研究,得到了和实验相吻合的结果.计算表明对于纯p-xylene溶剂和有含少量水的p-xylene溶剂,体系没有发生相分离,随着水的含量增加,体系发生了明显... 详细信息

用介观动力学在介观层次上对不同组分的pluronic L64/水/p-xylene三元体系的相分离进行了研究,得到了和实验相吻合的结果.计算表明对于纯p-xylene溶剂和有含少量水的p-xylene溶剂,体系没有发生相分离,随着水的含量增加,体系发生了明显的相分离,产生了不同形态的胶团.本研究还通过对比不同溶剂组分下的体系介观形貌,讨论了水在体系相分离中的作用.同时通过分析模拟了1 000步后体系中水的分布,证实在胶团核中存在自由水(free water)的猜想.

关键词： pluronic L64 相分离介观动力学密度泛函高斯链相互作用参数溶液属性非离子型表面活性剂水 p-xylene 三元体系

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Viscosities of pure Water, Acetic Acid ＋ Water, and p-xylene ＋ Acetic Acid ＋ Water at Different Temperature and pressure

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Chinese Journal of Chemical Engineering 2010年第3期18卷 446-454页

作者：乔燕邸志国马友光马沛生夏淑倩 Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Daqing petrochemical Engineering Co. Ltd. Daqing 163714 China

The viscosities of pure water,the acetic acid+water binary system,and the p-xylene+acetic acid+ water ternary system at different concentrations were determined with a rolling-ball viscometer at temperatures from 313.15 to 473.15 K and pressures from 0.10 to 3.20 *** viscosity data were fitted by a correlation equation for the estimation of the mixture *** average absolute deviations(AAD)of the correlation for binary and ternary systems are 2.48%and 1.77%,respectively.

关键词： viscosity rolling-ball method acetic acid p-xylene

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