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Preparation method of catalyst for propane oxidative dehydrogenation to propylene

A technology for oxidative dehydrogenation and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low metal utilization in carrier channels and accelerate deep oxidation of products , the contribution of the catalyst is not large, etc., to avoid further oxidation, improve the conversion rate and selectivity of propylene, and improve the effect of utilization

Active Publication Date: 2016-07-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The oxidative dehydrogenation of propane to propylene is still a fast reaction (this kind of fast reaction is generally carried out under the condition of mass transfer control), and the reaction is completed when the reactants reach the outer surface of the catalyst, so the inner surface of the catalyst is relatively The target reaction does not contribute much, which results in lower metal utilization in the pores of the support, increases the cost of the catalyst, and also accelerates the deep oxidation of the product

Method used

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  • Preparation method of catalyst for propane oxidative dehydrogenation to propylene

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Embodiment 1

[0035] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8h, and the obtained catalyst was calcined at 450°C for 4h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3wt%, V: 2.5wt% , Ni: 1.9wt%, Al 2 o 3 : 71.2wt%), grind the catalyst to 200 mesh (means passing through a 200 mesh sieve), weigh 100 grams of powder, add 260mL of 98wt% concentrated sulfuric acid, stir at 50°C to dissolve the solid, collect the filtrate by filtration, and pour Add 54.01g of nickel nitrate to the filtrate, stir and dissolve, then add 27.31g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 1), add 142.13g of pseudo-boehmite after all dissolved, and stir at 70°C until The solution was evaporated to dryness, the resulting solid was dried at 100°C for 8h, and then calcined at 600°C for 4h to obtain the catalyst precursor A, wherein Mo accounted for 6wt% of the we...

Embodiment 2

[0037] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8h, and the obtained catalyst was calcined at 450°C for 4h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3wt%, V: 2.5wt% , Ni: 1.9wt%, Al 2 o 3 : 71.2wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 300mL of a mixed solution of 98wt% concentrated sulfuric acid and 65wt% concentrated nitric acid, the volume ratio is 2:1, in Stir at a constant temperature at 50°C to dissolve the solid, collect the filtrate by filtration, add 54.01g of nickel nitrate to the filtrate, stir and dissolve, then add 40.98g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 1.5), and dissolve all Add 51.65 g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the resulting solid at 100°C for 8 hours, and roast...

Embodiment 3

[0039] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8h, and the obtained catalyst was calcined at 450°C for 4h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3wt%, V: 2.5wt% , Ni: 1.9wt%, Al 2 o 3 : 71.2wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 450mL of a mixed solution of 35wt% concentrated hydrochloric acid and 65wt% concentrated nitric acid, and the volume ratio is 1:1. Stir at a constant temperature at 50°C to dissolve the solid, collect the filtrate by filtration, add 54.01g of nickel nitrate to the filtrate, stir to dissolve, add 13.66g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 0.5), and dissolve all Add 447g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 100°C for 8 hours, and roast at 6...

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Abstract

The invention relates to a preparation method of a catalyst for propane oxidative dehydrogenation to propylene. The catalyst comprises an active ingredient, an additive and a carrier. The preparation method is as below: treating a waste residue oil hydrogenation catalyst to prepare a catalyst precursor A; reducing the catalyst precursor A in a reducing atmosphere; adding the reduced catalyst precursor A and a polyol solution into a high pressure reactor, carrying out a hydrogenation reaction, placing a reaction effluent, filtering and dying to obtain a catalyst precursor B; and dissolving the active ingredient precursor in water to obtain a solution C, then adding the catalyst precursor B, drying and calcining to obtain the catalyst. The method of the present invention not only makes full use of waste residue oil hydrogenation catalyst, saves cost, but also promotes dispersion of more active ingredients on the surface of the carrier. The method both improves the utilization of the active metal and the conversion of propane and selectivity of propylene.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for oxidative dehydrogenation of propane to produce propylene, in particular to a method for preparing a supported vanadium-based catalyst for oxidative dehydrogenation of propane to produce propylene. Background technique [0002] Propylene is an extremely important organic chemical raw material, widely used in the production of a series of important chemical products such as polypropylene, polyacrylonitrile, phenol, oxo alcohol, propylene oxide, acrolein and acrylic acid. [0003] At present, propylene is mainly produced by catalytic cracking of petroleum and catalytic dehydrogenation of propane. The production process of propane catalytic dehydrogenation to propylene is controlled by thermodynamic equilibrium, the reaction conditions are harsh, and there are problems such as rapid deactivation of the catalyst due to carbon deposition. The oxidative dehydrogenation of propane is a new way to...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07C11/06C07C5/48
CPCY02P20/52
Inventor 孙晓丹张舒冬张信伟刘继华
Owner CHINA PETROLEUM & CHEM CORP
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