Research On Low-temperature Liquid Methanol Synthesis Catalyst

Catalyst performance is relationship to the catalyst specific surface area. The greater the catalyst specific surface area is, the higher the catalyst performance is. In the thesis, in the processing of preparing the copper-based catalyst by the complex precipitation method, adding the surfactant can improve the performance of catalyst. Silicon auxiliaries make different aperture and pore structure of silicon oxide component contained in the copper-based catalyst, can greatly increase the specific surface area catalyst to improve the performance of copper-based catalyst.The composition of solvent will affect the rate of carbonylation reaction rate, and play a role on the rate of liquid-phase methanol synthesis. In the thesis, we need to seek the solvent promoting carbonylation and change the composition of liquid-phase to establish the dual catalyst system, for improving the liquid methanol synthesis response rate, and increasing the time and space yield of methanol.In the thesis, we investigate the performance of copper chromium catalyst with the time and space yield of methanol, thus we need to analyze the impact of copper-based catalyst performance factors on the two aspects such as preparation of the process and the reaction of methanol. Catalyst performance factors divided into the impact of significant factors and non-significant factor.In the preparation process of copper based catalyst, the significant factors contain the mol ratio of copper to chromium, precipitation pH, precipitation and aging temperature, drying temperature, baking temperature, et al. The factors that recipitation reaction time, aging time, drying time and baking time are the non-significant factors. We need to deal with orthogonal experimental form of significant factors to determine the impact of factors affecting primary and secondary level, combining the optimal level of factors, to determine the optimal copper-based catalyst preparation process parameters.In the synthesis of methanol, the synthesis parameters affecting the time and space yield of methanol include significant factors and non-significant factors. The factors that the concentration of copper-based catalyst, the concentration of the sodium methoxide, the volume ratio of synthetic gas, the reaction temperature and the stirring speed of autoclave are the significant factors. The non-significant factor is the intake way of synthesis gas. Analyzing the impact curve to choose the most optimized synthesis parameters, then the best catalyst performance was determined.