Shape-selective catalyst for efficiently preparing p-xylene from synthesis gas and light aromatic hydrocarbon

A technology for light aromatics and p-xylene, which is applied in the direction of carbon compound catalysts, catalysts, molecular sieve catalysts, etc., can solve the problems of low conversion efficiency and low xylene yield, and achieve the goal of reducing the rate of coking and carbon deposition and high conversion efficiency Effect

Inactive Publication Date: 2020-01-17
XIANGTAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to provide a shape-selective catalyst for efficiently producing p-xylene from synthesis gas and light aromatics and its application method, so as to solve the problems in the catalytic technology of producing p-xylene from synthesis gas and light aromatics proposed in the background technology. Problems of low conversion efficiency of carbon monoxide and light aromatics and low yield of p-xylene

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  • Shape-selective catalyst for efficiently preparing p-xylene from synthesis gas and light aromatic hydrocarbon

Examples

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Effect test

Embodiment 1

[0020] 1) Weigh 12g of needle-shaped crystals with a cross section of 90nm and a nano-acicular HZSM-5 molecular sieve with a silicon-aluminum atomic molar ratio of 55 and mix them with 8g of alumina binder. After stirring evenly, add an appropriate amount of dilute nitric acid to knead and extrude Shaped, dried at room temperature, and then calcined at 500° C. for 1 hour to obtain a strip-shaped catalyst with a cross-sectional diameter of 1.5 mm. Then the above-mentioned shaped unmodified catalyst particles were sequentially immersed in a certain concentration of ferric nitrate aqueous solution and magnesium nitrate aqueous solution for 12 hours, and the loading capacity of iron oxide and magnesium oxide was determined by the liquid absorption and solution concentration of the unmodified catalyst. They are 1g and 2g respectively, and the impregnated samples are dried at 120°C for 6 hours and then calcined at 500°C for 1 hour. Finally, a nanoacicular HZSM-5 molecular sieve cata...

Embodiment 2

[0023] 1) Weigh 19g of nano-acicular HZSM-5 molecular sieve with a silicon-aluminum atomic molar ratio of 500 and acicular cut-off surface diameter of 3nm, and 1g of silicon oxide binder, roll into a ball, and dry at room temperature, 500 °C for 1 hour to obtain spherical catalyst particles with a diameter of 1.5 mm. Then the above-mentioned unmodified catalyst formed by molding is successively immersed in a certain concentration of gallium nitrate, zinc nitrate, lanthanum nitrate and zirconium nitrate aqueous solution for 12 hours, and the gallium oxide, zinc nitrate and zirconium nitrate are determined by the liquid absorption and solution concentration of the unmodified catalyst. The loads of zinc oxide, lanthanum oxide, and zirconium oxide were 1g, 1g, 2g, and 2g, respectively. The impregnated samples were dried at 120°C for 6 hours, and then calcined at 500°C for 1 hour. Finally, a nano needle-like HZSM-5 catalyst compositely modified with 5wt% gallium oxide, 5wt% zinc ox...

Embodiment 3

[0026]1) Weigh 14g of nano needle-shaped HZSM-5 molecular sieve with a silicon-aluminum atomic molar ratio of 2 and acicular crystal cut-off surface diameter of 400nm, and mix it with 6g of silicon oxide binder, and dry it at room temperature, Calcination was performed for 1 hour to obtain ring-shaped catalyst particles with an outer diameter of 1.5 mm. Then the unmodified catalyst particle of above-mentioned gained molding is excessively impregnated 12 hours in the copper nitrate aqueous solution of certain concentration, determines the loading capacity of copper oxide by the liquid absorption amount and solution concentration of unmodified catalyst to be 0.2g, the sample after impregnating is in After drying at 120°C for 6 hours, it was baked at 500°C for 1 hour. Finally, a 1wt% copper oxide-modified nanoacicular HZSM-5 catalyst was obtained.

[0027] 2) 5g of the above-mentioned copper oxide modified molecular sieve catalyst is loaded into a miniature adiabatic fixed-bed r...

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Abstract

The invention discloses a shape-selective catalyst for efficiently preparing p-xylene from synthesis gas and light aromatic hydrocarbon, and an application method of the shape-selective catalyst, wherein the shape-selective catalyst comprises 60-95 wt% of a hydrogen type nanometer needle-like short-pore ZSM-5 molecular sieve, 5-40 wt% of a binder and a modification aid, and the content of the modification aid is 10-30 wt% of the total weight of the molecular sieve and the binder. Compared with the catalyst in the prior art, the catalyst of the invention has the following characteristics that with the application of the catalyst in to a reaction for preparing p-xylene from synthesis gas and light aromatic hydrocarbon, the catalyst is a short-pore shape-selective catalyst, especially has high p-xylene selectivity, high light aromatic hydrocarbon conversion efficiency and long service life, and can effectively improve the p-xylene yield and reduce the catalyst regeneration and replacementfrequency so as to significantly improve the technical economy of the synthesis route.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a shape-selective catalyst for efficiently preparing p-xylene from synthesis gas and light aromatic hydrocarbons and an application method thereof. Background technique [0002] As one of the most important basic aromatic raw materials, p-xylene is widely used in polyester synthesis, pesticides, dyes, medicine and other fields. In recent years, with the sustained and rapid development of the polyester industry and the fine chemical industry, the demand for p-xylene is growing rapidly year by year. Its current main commercial production methods are xylene isomerization separation and toluene shape-selective disproportionation based on petroleum route. On the one hand, these two processes have the problems of low yield of p-xylene and low utilization rate of toluene raw materials respectively; on the other hand, the depletion of global oil resources is accelerating, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/42B01J29/46B01J29/48C07C2/86C07C15/08
CPCB01J29/405B01J29/42B01J29/46B01J29/48B01J2229/186C07C2/86C07C2529/40C07C2529/42C07C2529/46C07C2529/48C07C15/08Y02P20/52Y02P20/584
Inventor 李军辉龚清宋剑红谢阳利方婷
Owner XIANGTAN UNIV
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