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GB/T 23799-2021车用甲醇汽油（M85）Methanol gasoline (M85) for motor vehicles
GB/T 23799-2021车用甲醇汽油（M85）Methanol gasoline (M85) for motor vehicles...
2022-03-14 21:41:44浏览：67
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针对甲醇泄漏对循环水系统的影响及处理措施
某煤制烯烃项目循环水系统在生产运行过程中，由于化工装置甲醇物料介质泄漏至循环水系统中，循环水系统出现大量白色泡沫，浊度、CODcr、异养菌、总铁、生物粘泥量等水质指标超标，导致循环水水质迅速恶化。本文针对甲醇泄漏对循环水系统的影响进行剖析，采用投用非氧化杀菌剂、排水置换和加强监控等方法进行应急处理，保证了循环水系统的平稳运行。...
2020-11-10 09:33:08浏览：93
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合成气制甲醇铜基催化剂CuO/ZnO/KIT-6的制备与表征
以KIT-6为载体,采用浸渍法制备了新型的CuO/ZnO/KIT-6催化剂,通过TEM、XRD、N2-吸附脱附等方法对催化剂的结构形貌进行了表征,探究了活性组分CuO/ZnO在KIT-6载体上的分散状态.在此基础上,考察了CuO/ZnO/KIT-6催化剂在合成气制甲醇反应中的催化活性和热稳定性.研究发现,KIT-6载体具有立方Ia3d孔结构以及开放有序的孔道,可在一定程度上抑制活性组分粒子的生长,从而使活性组分CuO/ZnO在载体的表面和孔道中均匀分散,且晶粒尺寸较小.催化性能结果表明,与常规SiO2颗粒载体相比,以介孔KIT-6为载体的催化剂显示出更高的催化活性.此外,CuO/ZnO/KIT-6表现出较好的热稳定性.这是由于CuO/ZnO活性组分以极小的尺寸高度分散在了KIT-6载体的表面和孔道中,有效改善了传统CuO/ZnO/Al2O3催化剂活性组分在高温下容易发生烧结的现状,提高了催化剂的稳定性....
2020-10-22 17:35:41浏览：64
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煤基甲醇制烯烃项目中合成气制甲醇装置的改造方案
针对某煤基甲醇制烯烃项目中甲醇合成装置反应器内取热能力不足,循环器压缩机超负荷运行等问题,进行了原因分析及技术改造.通过新增甲醇合成回路,利用上游气化装置的富余产能为甲醇合成提供原料气,解决了上述问题,实现了合成气制甲醇装置总产能由原来的5 500 t/d增加至6 000 t/d....
2020-10-02 20:35:09浏览：44
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Application of in-plasma catalysis and post-plasma catalysis for methane partial oxidation to methan
Methane partial oxidation to methanol (MPOM) using dielectric barrier discharge over a Fe2O3-CuO/γ-Al2O3 catalyst was performed. The multicomponent catalyst was combined with plasma in two different configurations, i.e., in-plasma catalysis (IPC) and post-plasma catalysis (PPC). It was found that the catalytic performance of the catalysts for MPOM was strongly dependent on the hybrid configuration. A better synergistic performance of plasma and catalysis was achieved in the IPC configuration, but the catalysts packed in the discharge zone showed lower stability than those connected to the discharge zone in sequence. Active species, such as ozone, atomic oxygen and methyl radicals, were produced from the plasma-catalysis process, and made a major contribution to methanol synthesis. These active species were identified by the means of in situ optical emission spectra, ozone measurement and FT-IR spectra. It was confirmed that the amount of active species in the IPC system was greater than that in the PPC system. The results of TG, XRD, and N2 adsorption-desorption revealed that carbon deposition on the spent catalyst surface was responsible for the catalyst deactivation in the IPC configuration....
2020-07-08 21:52:19浏览：77
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Catalytic methanol decomposition to carbon monoxide and hydrogen over Pd/CeO2-ZrO2-La2O3 with differ
The catalytic behaviors of Pd (1.4 wt%) catalysts supported on CeO2-ZrO2-La2O3 mixed oxides with different Ce/Zr molar ratios were investigated for methanol decomposition. Nitrogen adsorption-desorption (BET), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR), X-ray diffraction (XRD) and Pd dispersion analysis were used for their characterization. Pd/Ce0.76Zr0.18 La0.06 O1.97 catalyst showed the highest BET surface area, best Pd dispersion capability and strongest metal-support interaction. Moreover, XPS showed that there was lattice defect oxygen or mobile oxygen. According to the result of O 1s measurements the lattice defect oxygen or mobile oxygen helped to maintain Pd in a partly oxidized state and increased the activity for methanol decomposition. The Pd/Ce0.76Zr0.18La0.06O1.97 catalyst exhibited the best activity. A 100% conversion of methanol was achieved at around 260℃, which was about 20-40 ℃ lower than other catalysts...
2020-07-08 21:52:19浏览：34
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Effects of La2O3 contents on the Pd/Ce0.8Zr0.2O2-La2O3 catalysts for methanol decomposition
The catalytic behaviors of Pd (1.4 wt.%) catalysts supported on CeO2-ZrO2 promoted with La2O3 were investigated for methanol decomposition. The measurements of inductively coupled plasma emission spectroscopy (ICP), N2 adsorption-desorption (BET), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR) and oxygen storage capacity (OSC) were used to characterize the properties of catalysts. The catalysts′ activities were tested in a fixed bed continuous flow reactor operating under atmospheric pressure. The Pd/Ce0.sZr0.2O2-5 wt.%La2O3 catalyst exhibited the best activity. The reasons for this were twofold: (1)doping of La improved effectively textural properties of CeO2-ZrO2 oxygen storage materials, and (2) Pd/Ce0.8Zr0.2O2-5 wt.% La2O3 possessed super oxygen storage property and reducibility due to the existence of lattice defect oxygen or mobile oxygen, which helped to re-oxidize zerovalent Pd0 to a partly oxidized Pdδ+. By introducing 5 wt.%La2O3, the specific surface area of the sample increased, but declined if further increasing the content of La2O3 to 10 wt.%....
2020-07-08 21:52:19浏览：54
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Crystal Structure of Norfloxacin Methanol Solvate: C16H18FN3O3 CH3OH H2O
Norfloxacin methanol solvate (1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid methanol solvate) has been prepared. The crystal and molecular struc- tures of the title compound, C16H18FN3O3·CH3OH·H2O, were determined by X-ray diffraction me- thod. The compound crystallizes in monoclinic, space group P21/c with a = 7.8660(16), b = 22.525 (5), c = 10.253(2)(A), β = 108.31°, Mr = 369.39, V = 1724.7(6) (A)3, Z = 4, Dc = 1.423 g/cm3, F(000) = 784, R = 0.0557 and wR = 0.1224. The TGA analysis indicates that it decomposes completely at 723.75 ℃....
2020-07-08 21:52:19浏览：67
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Methanol Oxidation over TiO2-modified Multi-walled Carbon Nanotubes Supported Pt-Mo Electrocatalyst
In order to develop a novel and high-performance catalytic material for direct methanol fuel celIs(DMFC), molybdenum oxide as a co-catalyst with Pt on multi-walled carbon nanotubes which were modified by titanium dio- xide(denoted as CNTs@TiO) was investigated. The physicochemical characterizations of the catalysts were carried out via X-ray diffraction(XRD), transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS). Cyclic voltammetry(CV) showed that the CO-tolerance performance increased in the sequence of Pt/CNTs<>...
2020-07-08 21:52:19浏览：74
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Para-Xylene Maximization Part VIII: Promotion of H-ZSM-5 Zeolite by Pt and HF Doping for Use as Cata
Toluene was alkylated with methanol in a flow type reactor at temperatures between 300 and 500℃ using H-ZSM-5 zeolite, 0.2%Pt/H-ZSM-5 and hydrofluorinated 0.2%Pt/H-ZSM-5 with HF concentrations of 1.0%, 2.0%, 3.0%, or 4.0%. Pt primarily enhances toluene conversion, total xylenes production, and p-xylene relative to its thermodynamic equilibrium. As the concentration of HF increases from 1.0% to 3.0%, the catalyst activity increases because of the increase in the number of acid sites and their strength. Additionally, the surface area and Pt dispersion also increases. An advantage of increased HF doping is that the formation of voluminous trimethylbenzene (TMB) byproducts is inhibited. However, at a HF concentration of 4.0%, AI and Si are partially leached and then deposited mostly in the wider catalytic pores. This was determined by evaluating the pore volume distribution and we determined that reactivity inhibition was ob-viously present and was due to diffusion restriction....
2020-07-08 21:52:19浏览：61
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Electrocatalytic oxidation of methanol on carbon-nanotubes/graphite electrode modified with platinum
Electrochemical codeposition and electrocatalytic properties of platinum and molybdenum oxide nanoparticles (Pt-MoOx) on carbon-nanotubes/graphite electrode for methanol oxidation were investigated. The micrograph and elemental composition of the resulting Pt-MoOx/CNTs/graphite electrode were characterized by scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS). The results show that the Pt-MoOx particles with the average size of about 50 nm are highly dispersed on the CNTs surface. The Pt-MoOx/CNTs/graphite electrode delivers excellent electrocatalytic properties for methanol oxidation. The highest mass activity(Am) reaches 264.8 A/g at the loading mass of 159.3 (g/cm2. This may be attributed to the small particle size and high dispersion of Pt-MoOx catalysts deposited on the CNTs surface. The kinetic analysis from electrochemical impedance spectroscopy(EIS) reveals that the existed MoOx phase can improve the chemisorptive and catalytic properties for methanol oxidation....
2020-07-08 21:52:19浏览：53
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Effects of environmental factors on corrosion behaviors of metal-fiber porous components in a simula
To enable the use of metallic components in direct methanol fuel cells (DMFCs), issues related to corrosion resistance must be considered because of an acid environment induced by the solid electrolyte. In this study, we report the electrochemical behaviors of metal-fiber-based porous sintered components in a simulated corrosive environment of DMFCs. Three materials were evaluated:pure copper, AISI304, and AISI316L. The environmental factors and related mechanisms affecting the corrosion behaviors were analyzed. The results demonstrated that AISI316L exhibits the best performance. A higher SO42-concentration increases the risk of material corrosion, whereas an increase in methanol concentration inhibits corrosion. The morphological features of the corroded samples were also characterized in this study....
2020-07-08 21:52:19浏览：40
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Electrodeposited Pt and Pt-Sn nanoparticles on Ti as anodes for direct methanol fuel cells
Electro-oxidation of methanol was studied on titanium supported nanocrystallite Pt and Ptx-Sny catalysts prepared by electrodeposition techniques. Their electro-catalytic activities were studied in 0.5mol/L H2SO4 and compared to those of a smooth Pt, Pt/Pt and Pt-Sn/Pt electrodes. Platinum was deposited on Ti by galvanostatic and potentiostatic techniques. X-ray diffractometer (XRD) and energy dispersive X-ray (EDX) techniques were applied in order to investigate the chemical composition and the phase structure of the modified electrodes. Scanning electron microscopy (SEM) was used to characterize the surface morphology and to correlate the results obtained from the two electrochemical deposition methods. Results show that modified Pt/Ti electrodes prepared by the two methods have comparable performance and enhanced catalytic activity towards methanol electro-oxidation compared to Pt/Pt and smooth Pt electrodes. Steady state Tafel plots experiments show a higher rate of methanol oxidation on a Pt/Ti catalyst than that on a smooth Pt. Introduction of a small amount of Sn deposited with Pt improves the catalytic activity and the stability of prepared electrode with time as indicated from the cyclic votlammetry and the chronoamperometric experiments. The effect of variations in the composition for binary catalysts of the type Ptx-Sny/Ti towards the methanol oxidation reaction is reported. Consequently, the Ptx-Sny/Ti (x∶y (8∶1), molar ratio) catalyst is a very promising one for methanol oxidation....
2020-07-08 21:52:19浏览：62
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