Slurry bed Cu-based CO hydrogenation CH4 catalyst, preparation method and application

Abstract

The invention discloses a Cu-based catalyst for preparing CH4 through Co hydrogenation on a slurry bed, and belongs to the technical field of chemical engineering. The catalyst is composed of X-Cu / Zn / Al, X and Cu are active components, Zn is an assistant, Al is a carrier, and the mole percent of the components is shown in the formula: Cu / Zn / Al=1.0-4.0:0.5-2:0.4-1.5, and the X accounts for 1-20% according to the mass fraction. According to the method, AlOOH is preferably prepared, then the assistant and the active components are added, finally, an obtained catalyst precursor is subjected to liquid phase heat treatment in an inert medium, and then the slurry catalyst is obtained. The prepared slurry catalyst is applicable to preparing of CH4 through CO hydrogenation on a slurry bed reactor, the high CO conversion rate and CH4 selectivity are displayed on the slurry bed reactor, catalyst raw materials are easy to obtain, and the preparing method is simple.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a method for preparing CH by hydrogenation of Cu-based CO in a slurry bed reactor. 4 Catalyst preparation methods and applications. technical background [0002] Natural gas is a safe, efficient and ideal clean energy, the main component is alkanes, among which CH 4 The vast majority, and a small amount of ethane, propane, and butane. In recent years, with the rapid development of China's urbanization and industrialization, the gap in domestic natural gas supply is increasing year by year, and the dependence on foreign countries is showing a trend of rapid increase. [0003] According to relevant data forecasts, by 2020, the domestic natural gas gap will reach 100 billion cubic meters. In 2011, China's dependence on foreign natural gas reached 24%, compared with 12.8% in 2010, showing a double growth trend. This has objectively increased the demand for un...

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Problems solved by technology

However, the cost of the reactor is high, the structure is very complex, and the recovery rate of heat energy is often relatively low. Now, more and more adiabatic bed reactors are used to dilute the inlet raw material gas with part of the product to control the concentration of CO and to use it to The reaction is controlled within a wide temperature range, which can improve the recovery rate of high-grade steam, and the heat energy utilization rate is also high (CN201010173181, US4298694, US4205961), but in the industrial process of multi-stage reactions in series, in the first few stages , the CO concentration in the raw material gas is still high, the overall heat capacity of the gas is small, heat transfer is difficult, and the catalyst is easy to sinter, which requires the catalyst to have good heat resistance and high thermal stability. However, the common problem of current catalysts is that the heat resistance temperature is low , poor thermal stability, which is why domestic coal-to-natural gas has not yet been put into large-scale production and operation