Preparation method and application of phosphorus modified supported bimetallic catalyst

Abstract

The invention belongs to the technical field of industrial catalysts, and relates to a preparation method of a phosphorus modified supported bimetallic catalyst, the method comprises the following steps: (1) selecting gamma-Al2O3 as a carrier for later use; (2) dissolving a nickel salt, a tungstate and a phosphorus reagent in water in a certain proportion to be used as dipping liquid for later use; (3) putting the gamma-Al2O3 carrier of the step (1) into the dipping liquid of the step (2), filtering the impregnated carrier after being treated by a microwave chemical reactor, and drying a filter cake in an oven for later use; (4) placing the filter cake dried in the step (3) into a microwave pipe furnace, roasting in an inert atmosphere by adopting a programmed heating mode, and irradiatingand heating to finally obtain the phosphorus modified supported bimetallic catalyst, and applying the phosphorus modified supported bimetallic catalyst in a low-temperature coal tar hydrocracking process. The preparation method can improve the activity performance of the catalyst, improve the yield and rate of hydrogenation saturation reaction, reduce the temperature and pressure of the hydrogenation process, and is energy-saving and safe.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysts, and relates to a supported bimetallic catalyst, in particular to a preparation method and application of a phosphorus-modified supported bimetallic catalyst. Background technique [0002] Coal tar is a black or dark brown viscous liquid, which can be roughly divided into three categories: low-temperature pyrolysis (500-600°C), medium-temperature pyrolysis (700-800°C), and high-temperature pyrolysis (950-1050°C). Among them, low-temperature coal tar is one of the main products of low-rank coal upgrading technology, and it is also one of the technical problems that my country's coal chemical industry focuses on. At present, light weight methods are usually used to produce gasoline, diesel and chemicals, etc. In particular, low-temperature coal tar can be used to prepare high-performance jet fuel components rich in naphthenes and hydrogenated aromatics through hydrotreating. Clean and e...

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Problems solved by technology

Studies have shown that different Ni / W atomic ratios have a great influence on the hydrogenation performance of Ni-W catalysts. With the increase of the metal content in the catalyst, the activity of the catalyst shows a trend of first increasing and then decreasing. This is because the metal of the catalyst species When the content is high, the dispersion and multi-layer results can provide more active phases, promote the dispersion of active metal particles, and improve the catalytic activity, but when the metal content exceeds a certain range, the active components will be aggregated due to the high content of active components. , the crystal grains increase, causing the dispersion to decrease, and finally leading to a decrease in catalyst activity. The relative Ni-Mo content has a more complicated influence on the hydrogenation activity of the catalyst: there is a maximum point between the active metal content and the catalyst activity. After exceeding the maximum point, As the content of active metal increases, the crystallinity of the catalyst decreases, the pore structure changes, the pore size becomes smaller, and the activity decreases

[0004] In short, the metal type and content of the non-precious metal catalyst and the solid phase pore structure have a great influence on the catalytic efficiency of coal tar lightening. At the same time, the composition and content of low-temperature coal tar are different from heavy oil, so heavy oil cannot be simply used for catalytic cracking. Therefore, it is necessary to find a new type of catalyst for the hydrocracking process of low temperature coal tar

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