How to select catalysts for the coal-to-methanol shift unit
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How to select the catalyst for the coal-to-methanol shift unit? Gasification is carried out as water-coal slurry gasification; synthesis uses a Lurgi shell-and-tube methanol synthesis reactor, and purification is achieved through low-temperature methanol washing. May I ask, what factors do experts mainly consider when choosing a catalyst? Which catalyst is more suitable for the conditions mentioned above? Where can I find detailed information on the relevant catalysts?
:Lol :) :victory: As long as the sulfur content in the coal is not too low, and the H2S+COS level in the gasified gas is greater than 100 ppm, domestic Co/Mo conversion catalysts such as those from Qilu and Nanhua can be used.
The shift reaction following water-coal slurry gasification is well-developed; the selection of shift catalysts should take into account the water-to-gas ratio and shift pressure. Generally, the water-gas ratio for Texaco gas generation is around 0.9, with pressures available at 3.8 MPa and 6.5 MPa. Our wide-temperature, sulfur-resistant shift catalysts are compatible with shift processes of various scales, pressures, and water-to-gas ratios. If you need relevant information or details on their applications, feel free to contact me.
I really need help; I have very little information on this topic. Could you send it to me? My email: xkzzj@126.com
Pressure is the main and primary consideration. Because the pressures for cobalt-molybdenum catalysts vary, different carriers are selected. Generally, 3.0 MPa is a threshold; catalysts using alumina as a carrier can be used when the value is below this threshold, such as the products from Hubei Institute ； For values above this limit, catalysts using magnesium-aluminum spinel as a carrier are generally chosen, such as K-88, QCS series, etc.
For coal-to-methanol production, sulfur-resistant catalysts that can operate over a wide temperature range are an excellent choice. They are widely used in China, as the coal used there is mainly of low degree of metamorphism and contains high levels of sulfur, which meets the operating conditions of cobalt-molybdenum-based catalysts. Moreover, the full low-metamorphism process associated with these catalysts has low energy consumption and high heat recovery efficiency; it also eliminates the need for pre-desulfurization steps, simplifying the process, reducing initial investment costs, and lowering operational expenses.