Papers by Keyword: Methanol

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Authors: Yong Ping Luo, Shun Jian Xu, Zong Hu Xiao, Yong Huang, Wei Zhong, Hui Ou
Abstract: In this work, it was investigated and compared that electro-catalytic oxidation of methanol in acidic medium at TiO2 nanotube (TNT) electrode modified by platinum (Pt) with two methods. Pt modified TNT electrodes were prepared by thermal decomposition (TD) and electrolytic deposition (ED). The so-prepared TD-Pt/TNT and ED-Pt/TNT electrodes were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical investigations indicate that ED-Pt/TNT has higher electro-catalytic activity and better tolerance to poisoning species in methanol oxidation than TD-Pt/TNT, which can be ascribed to the higher dispersion and stability of ED-Pt than TD-Pt on TNT electrode. The present work provides some basis for the design of high performance catalysts for direct methanol fuel cells.
Authors: Hai Xia Wang, Wen Wen Guo, Ling Jun Zhu
Abstract: Direct vapor-phase methanol carbonylation, without any methyl iodide in the feed as a promoter, was carried out over NiCl2-CuCl2/HMOR catalysts. The results showed that NiCl2-CuCl2/HMOR catalysts exhibited high activity for methanol carbonylation. The optimum component of the composite catalyst was 5wt% NiCl2 and 15wt% CuCl2. In addition, the effects of reaction pressure and temperature on catalytic performance of 5%NiCl2-15%CuCl2/HMOR catalyst were investigated. It was revealed that methanol conversion of 84.2% and carbonylation selectivity of 73.5% could be obtained under the optimum reaction conditions of P=1.5MPa and T=623K.
Authors: You Shun Luan
Abstract: A novel process for methanol and dimethyl ether(DME) synthesis was developed, in which two methanol-synthesis fixed-bed reactors were followed by an identical one for DME synthesis with cooling sections in between. Self-made Cu-Zn-Al catalyst for methanol synthesis and DME synthesis were used in this process. Tests of catalysts showed that both of them had activity and favorable stability and wound be capable of long-term industrial operation under the conditions. The investigation of processing parameters and stability led us safely to ensure the optimal condition: T1-200oC,T2-190 °C,T3-210 °C,5Mpa,total Space Velocity-1000h-1(T1,T2,T3 defined as temperature of catalytic beds in three serial reactors). Under that the catalytic system kept stable during the investigated hours.
Authors: Ching Song Jwo, Chien Chih Chen, Ho Chang, Sih Li Chen, Chi Hsiang Lin
Abstract: This research carries out an inexpensive, rapid and novel exercise, which is applied to perform the photocatalyst decomposition effectiveness of Methanol and Ethanol in gaseous form. The major devices of this applicable measurement developed by this practice are only utilizing ultraviolet-visible spectrophotometer and quartz cuvette, and the experimental procedures are straightforward and speedy. In the conduct experiments, Methanol and Ethanol with a specific concentration is initially injected into an enclosed quartz cuvette. Then the cuvette is put in ultraviolet- visible spectrophotometer to measure the Methanol and Ethanol concentration, so as to obtain an unique UV absorbance spectrum at its particular concentration. In the conduct experiments of measuring photocatalyst decomposition efficiency, the self-made (SANSS) nanocatalyst TiO2 is initially coated in the quartz plate, and put into the quartz. Then a specific concentration of methanol alcohol and ethanol is injected into the quartz cuvette under the UV irradiation exposure, so as to carry out photodecomposition of Methanol and Ethanol experiment. After that, the cuvettes are then put into the ultraviolet-visible spectrophotometer for measuring the absorbance intensity of UV spectrums in order to produce degradation chart. The preliminary results point out that the self-made nanocatalyst TiO2 has exceptionally outstanding decomposition efficiency which further points out the fact that, when UV irradiation for 60minutes, the gaseous Methanol can be reduced to 3.8% of the original sample, and the gaseous Ethanol can be reduced to 6% of the original sample. But when exercising with commercial nanocatalyst TiO2 to undergo the same process exactly under the same circumstances, the residue gaseous concentration can only be reduced to 17% and 16% of the gaseous Methanol and Ethanol original sample.
Authors: Xue Jing Jiao, Cheng Yang, Zuo Xing Di, Xian Ji Guo, Jin Hu Wu
Abstract: In this paper, a composite ZSM-5/MCM-48 material prepared by two step crystallization method has been characterized by XRD, nitrogen sorption, SEM and TEM. The activity and selectivity for the aromatization of methanol on ZSM-5/MCM-48 catalyst were much higher than these on H-ZSM-5, which may attribute to enhance the mass transfer properties and reduced diffusional limitations.
Authors: Xue Qiao Zhang, Ming Zhao, Zhi Xiang Ye, Sheng Yu Liu, Yao Qiang Chen
Abstract: Pd-based catalysts modified with BaO as a promoter was prepared by impregnation method. The catalyst was characterized by H2-temperature-programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS). The catalytic activity towards methanol showed that the BaO modification promoted the conversion of methanol. The light-off temperature (T50), complete conversion temperature (T90) and ΔT (T90-T50) for methanol oxidation are 100°C, 125°C and 25°C, respectively. The H2-TPR results showed that the addition of BaO increased palladium highly dispersed and promoted the reductive ability. It also enhanced the metal-support interaction and increased the electronic surroundings of Pd and Ce sites, which maintained Pd in a higher oxidized state and Ce4+ in Ce3+ state, consequently increased the activity for methanol oxidation according to XPS measurements.
Authors: A.K. Temu
Abstract: One of the disadvantages of homogeneous base catalysts in biodiesel production is that they cannot be reused or regenerated because they are consumed in the reaction. Besides, homogeneous catalysed process is not environmentally friendly because a lot of waste water is produced in the separation step. Unlike homogeneous, heterogeneous catalysts are environmentally benign, can be reused and regenerated, and could be operated in continuous processes, thus providing a promising option for biodiesel production. This paper presents catalytic activity of single and mixed solid catalysts in production of biodiesel from palm oil using methanol as well as ethanol at atmospheric pressure. The catalysts used are CaO, K2CO3, Al2O3, and CaO/K2CO3, CaO/Al2O3, K2CO3/Al2O3 mixtures. Results show that methanol is a better reactant with biodiesel yield ranging from 48 to 96.5% while ethanol gives yields ranging from 20 to 95.2%. The yield data for single catalysts range from 20 to 89.2% while that for mixed catalysts range from 52 to 96.5% indicating improvement in the activity by mixing the catalysts. The study also shows that biodiesel yield increases with catalyst loading which emphasizes the need for sufficient number of active sites. The properties of biodiesel produced compares well with ASTM D6751 and EN 14124 biodiesel standards.
Authors: Lu Zhou, Shu Zhong Wang, Hong He Ma
Abstract: A supercritical water oxidation (SCWO) reactor containing a hydrothermal flame as heat source is simulated by computational fuild dynamics (CFD) simulation. Methanol solution and oxygen are fed separately into the reactor as fuel and oxidizer, and at the same time the cold waste water is also fed into the reactor. The combustion of methanol is simulated by the eddy dissipation concept (EDC) model with an Arrhenius law kinetic. This simulation is conducted to study the behavior of the hydrothermal flame at different inlet fuel temperatures and the relationship between the ignition temperature and methanol mass fraction.
Authors: Akasyah M. Kathri, Rizalman Mamat, Amir Aziz, Azri Alias, Nik Rosli Abdullah
Abstract: Modelling the compression ignition engine mostly depends on fuel characteristics. The proses involve a model of the real system and carry out experiment as a mean of comparison to understand the behaviour of the system. The diesel engine nowadays operated with different kind of alternative fuels such as natural gas and biofuel. The aim of this article is to study the combustion characteristic occurred in an engine cylinder of a diesel engine when using biofuel. The one-dimensional numerical analysis using GT-Power software is used to simulate the diesel engine. The engine operated at full engine load and difference speed. The methanol fuel used in the simulation is derived from the conventional methanol fuel properties. The analysis of simulations includes the cylinder pressure, combustion temperature and rate of heat release. The simulation result shows that in-cylinder pressure for methanol is slightly higher than diesel fuel in any speed of the engine. It also found that the combustion characteristic on methanol temperature is higher at all crank angle degree of diesel fuel. Mass fraction burns of methanol are much lower than diesel fuel, but burns faster than diesel fuel.
Authors: Venkata Kalyan Chivukula, M.V. Aditya Nag
Abstract: Researchers, environmentalists, and policy makers are keen to reduce the dependency on use of fossil fuels towards climate change. Various alternatives are being implemented for alternate sources of energy for transportation sector; Biofuels can reduce the dependency on the import of the fossil fuels. Different kind of biofuels are available compositions are alcohols, ethers, esters etc. Commonly available biofuels are ethanol, methanol and biodiesel. They can be produced from various thermo-chemical and bio-chemical processes. Methanol has been gaining momentum as a potential alternative for traditional fossil fuels in transportation sector. There is an increased trend in the development of methanol as a fuel around the world. This paper deals with the study of the use of methanol as an automotive fuel. Methanol has certain positive properties on the vehicle’s performance. However, methanol cannot be used directly as a fuel in the vehicles due to volatility and compatibility issues. But it could be used as a blend with the gasoline for its characteristics such as high octane number and lower emissions. Blending of methanol with gasoline will have affect on the properties of blend, this paper discusses about the change in properties and its effects on engine.
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