搜索到384篇“ O-XYLENE“的相关文章
2023年国内邻二甲苯供需分析
2024年
以2019-2023年数据为基础,分析预测了邻二甲苯的生产、市场情况;重点对2023年邻二甲苯的市场、进出口、价格进行了分析。
卢俊典刘晓杰刘家名贾婷于胜楠
关键词:邻二甲苯进出口
粉煤灰基沸石X的制备与邻二甲苯、CO_(2)和H_(2)的吸附应用
2024年
本文通过探索碱熔活化条件,获得了最优的活化粉煤灰的条件(400℃,m(氢氧化钠)∶m(粉煤灰)=1∶2),并且在80℃下水热合成18 h获得了相对结晶度最高的粉煤灰基沸石X,通过XRD、FT-IR、SEM、BET等表征了粉煤灰基沸石X的物理特征。结果表明,合成沸石的相对比表面积达315.6 m^(2)/g,平均孔径为8.53 nm,总孔容积为0.412 cm^(3)/g。粉煤灰基沸石X展现了显著的邻二甲苯、二氧化碳和氢气吸附能力,分别为75.20 mg/g、2.45 mmol/g和0.22%(质量分数),且其吸附行为可以被Langmuir吸附等温线很好地拟合,属于单分子层吸附。本研究降低了粉煤灰沸石化过程中的能源消耗,并且所制备的粉煤灰基沸石X在能源和环境保护方面具有潜在的商用价值。
杨乐乐刘志远张亚龙张晓明程星星
关键词:粉煤灰沸石邻二甲苯氢气
气相色谱法测定碳九馏分中乙苯、对二甲苯、间二甲苯、邻二甲苯的含量
2023年
建立了测定碳九馏分中乙苯、对二甲苯、间二甲苯、邻二甲苯含量的毛细管色谱分析方法,根据石脑油加氢装置碳九馏分中组分重且含有一定量的非芳烃的特点,对影响分离的色谱条件进行了优化,定性出与样品相关的4种烃类化合物,采用外标法对各组分进行定量分析,并探究了利用芳烃抽提装置的混合二甲苯用作期间核查标样的可行性。
刘宇栋周静伟
关键词:碳八芳烃乙苯邻二甲苯间二甲苯对二甲苯
Room-temperature degradation of o-xylene in simulated air using an online-regenerable plasma-catalysis reactor with low amounts of nanosized noble metals on Co_(3)O_(4)
2023年
The plasma catalytic degradation of o-xylene in simulated air was improved by loading low amounts of Pt,Pd,or Au onto Co_(3)O_(4).At room temperature,o-xylene conversion and CO_(x)selectivity using a0.1 wt%Pt/Co_(3)O_(4)catalyst reached 98.9%and 80%,and the energy efficiency was at the top level in comparison with values in the literature.A stable o-xylene degradation performance could be obtained by online regenerating the heat-insulated reactor with a high energy density.After characterization,it was found that the loading of nanosized Pt not only increased the Co^(3+)/Co^(2+)ratio,where the Co^(3+)benefitted the formation of reactive oxygen species,but also conduced Pt^(0)to oxygen activation,resulting in effective promotion of complete o-xylene oxidation.Operando plasma diffuse reflectance infrared Fourier transform spectroscopy demonstrated the complete o-xylene oxidation and proved that Pt played a key role in the complete oxidation of o-xylene.
狄书成徐家成姚水良李晶吴祖良高尔豪朱佳丽戴连欣刘卫华张补河张峻维
Effect of different reduction methods on Pd/Al_(2)O_(3) for o-xylene oxidation at low temperature
2023年
Pd/Al_(2)O_(3)was pretreated by CO,H_(2)and NaBH_(4)reduction,respectively.The reduced catalysts were tested for o-xylene oxidation and characterized by power X-ray diffraction(XRD),transmission electron microscopy (TEM),X-ray photoelectron spectroscopy (XPS) and temperature-programmed decomposition of palladium hydride (TPDH).The characterizations indicate the pretreatments lead to distinct Pd particle sizes and amount of surface activated oxygen species,which are responsible for the catalytic performance.Compared with H_(2)and NaBH_(4)reduction methods,CO reduction shows a strong interaction between Pd and Al_(2)O_(3)with smaller Pd particle size and more surface activated oxygen.It exhibited excellent catalytic performance,complete oxidation of 50 ppmV o-xylene at 85℃with a WHSV of 60,000 mL/(g·hr).
Mingyu FanYafei WangJianghao ZhangChangbin ZhangXue Han
关键词:PDO-XYLENE
微通道条件下4,4′-(六氟亚异丙烯基)二邻二甲苯的合成研究被引量:1
2023年
以具有高传热系数和强耐腐蚀性的碳化硅微通道为反应器,对反应的停留时间、反应温度、物料配比及催化剂用量进行了优化。实验发现,实验温度为150℃,实验压力为3 atm,停留时间为20 min,4,4′-(六氟亚异丙烯基)二邻二甲苯的最优产率为65%,放大生产的产率为62.7%,较好地实现了邻二甲苯的氟烷基化反应。相较于传统的间歇式合成法,微通道连续法合成4,4′-(六氟亚异丙烯基)二邻二甲苯具有物料在线量小、反应时间短、工艺简单及反应压力小安全稳定等优点,具有较好工业化生产前景。
袁艳琴
关键词:微通道反应器邻二甲苯
国内邻二甲苯供需分析及预测
2023年
以2022年数据为主,对我国邻二甲苯的生产建设、市场、价格、进出口等情况进行了分析预测;对2023年我国邻二甲苯价格进行了预测。
卢俊典刘晓杰贾婷孙梦垚刘歌
关键词:邻二甲苯
邻二甲苯气相氧化制2-甲基苯甲醛工艺研究
2023年
以Mg,K和Cs改性的VO_(x)/SiO_(2)为催化剂,氧气为氧化剂,在固定床反应器中以邻二甲苯为原料氧化合成2-甲基苯甲醛,系统地考察了改性催化剂种类、反应温度、氧气与原料物质的量之比以及液时空速对氧化反应的影响。结果表明:催化剂表面碱性的增加有利于提高2-甲基苯甲醛的选择性。较优的反应条件为:以K-VO_(x)/Si O_(2)为催化剂,反应温度为400℃,氧气与邻二甲苯物质的量之比为4.5,邻二甲苯液时空速为0.36 h^(-1)。优化条件下,邻二甲苯氧化合成2-甲基苯甲醛具有较高的催化反应性能,邻二甲苯的转化率为10.5%,2-甲基苯甲醛的选择性达到98%以上。K-VO_(x)/SiO_(2)催化剂的稳定性较好,具有良好的工业应用前景。
孔臻极赵春生孙中华周维友陈群
关键词:邻二甲苯
Preparation and reaction mechanism of novel Ce_(x)Co_(y)Cuz oxide composite catalysts towards oxidation of o-xylene被引量:1
2022年
Ce_(x)Co_(y)Cuzoxide composite catalysts were prepared by using polyethylene glycol, citrate sol-gel method combined with PMMA template for the oxidation of o-xylene. The catalysts were characterized by the Xray diffraction(XRD), H2-temperature programmed reduction(H2-TPR), X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared spectroscopy(FT-IR), etc. The catalytic activity for o-xylene was investigated. The catalytic degradation pathway and mechanism of o-xylene were inferred. The results show that Ce O_(2)is mainly present on the surface of all catalysts. The surface area of Ce_(2)Co1Cu1is up to 77.2 m^(2)/g, and the average pore size is 10.62 nm. It exhibits redox and sufficient Ce^(4+)and Ce^(^(3+)), and reactive oxygen species, and has maximum O-H and C=O in the five catalyst samples. The catalytic activity of Ce2Co1Cu1is the best at low temperature, with the T50and T90values of 235 and 258°C at a space velocity of 32000 h-1, respectively. The o-xylene is oxidized to o-methyl benzaldehyde, and then further oxidized to o-methylbenzoic acid, and finally CO_(2)and H2O are formed.
Mengge ZhaoWeijian CaiJiwu Li
关键词:O-XYLENE
Cu-OMS-2中氧化铜掺杂位置对催化氧化邻二甲苯性能的影响
2022年
以高锰酸钾、丙醛和斐林试剂为原料,采用同步氧化还原法制备了不同比例的铜掺杂的隐钾锰矿八面体分子筛(0.01Cu-OMS-2,0.025Cu-OMS-2,0.05Cu-OMS-2)催化剂,并用于完全催化氧化邻二甲苯.结果表明,0.025Cu-OMS-2催化活性高;其T_(100),T_(50),T_(20)分别为180,158,146℃,较OMS-2分别降低了20,13,12℃,各种测试表明,在0.025Cu-OMS-2催化剂中,氧化铜掺杂到OMS-2的晶格中,氧空位含量较OMS-2增多,晶格氧流动性增强,分子氧转化为活性氧的能力增强,使0.025Cu-OMS-2具有高的催化活性.此外,0.025Cu-OMS-2还具有良好的稳定性.
张丽蕊邢一帆颜文秀庞欣吴银素
关键词:邻二甲苯催化氧化

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戴洪兴
作品数:444被引量:506H指数:11
供职机构:北京工业大学
研究主题:SUB 三维有序大孔 催化剂 甲苯氧化 纳米催化剂
邓积光
作品数:272被引量:225H指数:9
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谢少华
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作品数:4被引量:1H指数:1
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