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Determination of Magnesium Oxide Content in Petroleum Sulfur Tolerant Shift Catalyst

Tibet Mag Technology Co., Ltd. stated that due to the partial oxidation process of heavy oil (or residual oil) and the gasification process of coal-water slurry Texaco are carried out under relatively high pressure (generally 3.5 ~ 8.OMpa), and the gas The concentration of carbon monoxide is high (46-48%), the concentration of water vapor is high (the steam/gas ratio is as high as 1.5), and the heat of reaction is high (the outlet temperature of the first stage can reach 450-460°C), so it is required to be used in this process The sulfur-resistant shift catalyst can withstand heat, water vapor and high pressure. The catalyst has high strength and stable structure, so that it has sufficient service life. This kind of catalyst generally adds magnesium oxide and some other additives to the carrier, or adopts some special manufacturing methods to stabilize the structure of the carrier and catalyst. We classify this catalyst as a medium-temperature cobalt-molybdenum sulfur-tolerant shift catalyst with high pressure resistance. 

Magnesium oxide (MgO) is one of the important components of catalysts, and accurate determination of the true content of magnesium oxide is of great significance for controlling the performance of catalysts. Due to the existence of the most interfering elements in the catalyst, such as Co, Fe, Al, etc., bring great difficulties to the EDTA complexometric titration of magnesium, the original method (abbreviated method I) is used to mask the interfering elements with potassium cyanide and triethanolamine before the complexometric titration Because potassium cyanide is a highly toxic reagent, it is difficult to store, use and waste liquid treatment. People have been looking for a safe substitute for many years. The combined use of hydrogen peroxide (H2O2) and titanium dioxide (TiO2) has successfully replaced potassium cyanide, reducing potential safety hazards and environmental pollution, and ensuring personal health.

Determination of Magnesium Oxide Content in Petroleum Sulfur Tolerant Shift Catalyst

Verified the analytical method of using hydrogen peroxide and titanium dioxide to mask interfering elements to determine the content of magnesium oxide in the sulfur-tolerant shift catalyst, which replaced the highly toxic reagent potassium cyanide used in the original method. The measurement results were consistent with the original method, and the relative average deviation The maximum is 0.70%, the recovery rate is 97.60%~100.4%, and the reliability is good.

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