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Membrane catalyst precursor, membrane catalyst, preparation methods therefor and application of membrane catalyst

A catalyst and precursor technology, applied in the field of membrane catalyst precursors, can solve problems such as rising production costs, and achieve the effects of reducing sintering, dispersing uniformly, and improving catalytic activity

Inactive Publication Date: 2019-12-20
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current method of producing high-purity R125 is mainly to use a specific catalyst to reduce the R115 content in the reaction stage. If the R115 content is too high, the post-treatment system needs to be adjusted accordingly. The rectification of the post-treatment system will inevitably lead to an increase in production costs.

Method used

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  • Membrane catalyst precursor, membrane catalyst, preparation methods therefor and application of membrane catalyst
  • Membrane catalyst precursor, membrane catalyst, preparation methods therefor and application of membrane catalyst
  • Membrane catalyst precursor, membrane catalyst, preparation methods therefor and application of membrane catalyst

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preparation example Construction

[0049] The embodiment of the present invention provides a Pd / AlF 3 The preparation method of membrane catalyst precursor, comprises the steps:

[0050] S101, under the condition of pH 6.5-7.5, slowly drop an acid solvent into the polar organic solvent to obtain a mixed solvent.

[0051] Wherein, the polar organic solvent can be absolute ethanol, the acid solvent is one of hydrochloric acid, nitric acid or acetic acid, and the mass percentage of the acid solvent is 36%-70%. Preferably, the acid solvent is concentrated nitric acid with a mass percentage of 67%.

[0052] S102, respectively adding aluminum alkoxide, metal promoter salt, chloropalladium acid solution and surfactant to the mixed solvent, and refluxing in a constant temperature water bath at 50-70° C. to obtain a palladium-containing composite sol.

[0053] Wherein, the aluminum alkoxide is aluminum isopropoxide or aluminum butoxide, and the metal promoter salt includes at least two of zinc, chromium, nickel, tin c...

Embodiment 1

[0080] Preparation of palladium-containing composite sol: Slowly add concentrated nitric acid (wt%=67%) dropwise to absolute ethanol and stir evenly, control the pH value to 7.5, then add 100 parts of aluminum isopropoxide (metal mass ratio), 0.5 parts of CrCl 3 (Metal mass ratio), 0.5 parts of ZnCl 2 (Metal mass ratio), 2mL chloropalladium acid solution (palladium concentration: 0.010g / mL), 0.01 mole CTAB (cetyltrimethylammonium bromide), reflux in a constant temperature water bath at 50°C for 10h to obtain a palladium-containing composite sol.

[0081] Pd / AlF 3 Preparation of the composite membrane catalyst: the porous ceramics are placed in the palladium-containing composite sol, impregnated, dried, and roasted, and repeated six times to obtain the membrane catalyst precursor. The membrane catalyst precursor was placed in a 35wt.% HF solution, soaked in a water bath at 50°C for 2h, washed to neutrality, dried in vacuum at 60°C, and H 2 Pd / AlF with Pd loading of 1.2% obtai...

Embodiment 2

[0083] Preparation of palladium-containing composite sol: Slowly add concentrated nitric acid (wt%=67%) dropwise to absolute ethanol and stir evenly, control the pH value to 6.5, then add 100 parts of aluminum isopropoxide (metal mass ratio), 2 parts of NiCl2 (Metal mass ratio), 2.5 parts of ZnCl 2 (Metal mass ratio), 6mL chloropalladium acid solution (palladium concentration: 0.010g / mL), 0.04 mole CTAB (cetyltrimethylammonium bromide), reflux in a constant temperature water bath at 55°C for 15h to obtain a palladium-containing composite sol.

[0084] Pd / AlF 3 Preparation of the composite membrane catalyst: the porous ceramics are placed in the palladium-containing composite sol, impregnated, dried, and roasted, and repeated six times to obtain the membrane catalyst precursor. The membrane catalyst precursor was placed in 35wt.% HF solution, soaked in a 50°C water bath for 0.5h, washed to neutrality, vacuum-dried at 50°C, and H 2 Reduction at 400℃ in atmosphere to obtain Pd / A...

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Abstract

The invention relates to the technical field of catalysts and particularly relates to a membrane catalyst precursor, a membrane catalyst, preparation methods therefor and an application of the membrane catalyst. The preparation method for the precursor comprises the steps: slowly dropwise adding an acid solvent into a polar organic solvent, so as to obtain a mixed solvent; separately adding aluminum alkoxide, a metal assistant salt, a chloropalladic acid solution and a surfactant into the mixed solvent, and carrying out thermostatic water-bath refluxing, so as to obtain palladium-containing composite sol; and placing porous ceramics in the palladium-containing composite sol, and carrying out dipping, drying and roasting. According to the membrane catalyst and the preparation method therefor, disclosed by the invention, through preparing a palladium-containing composite aluminum fluoride membrane layer with a relatively large specific surface area, the catalytic activity of the catalystis improved; by addition of the surfactant, metal ions of the surface of the catalyst can be more uniformly dispersed, and the sintering of reactive metal palladium is reduced; and by addition of a metal assistant, the surface acidity / basicity of the membrane catalyst is improved, a reaction substrate can be more easily enriched on the surface of the membrane catalyst, and the conversion efficiency of the membrane catalyst is increased.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a membrane catalyst precursor, membrane catalyst, preparation method and application thereof. Background technique [0002] R125, also known as pentafluoroethane, is a chlorine-free Freon substitute that can be used as a refrigerant, foaming agent, fire extinguishing agent, propellant, carrier gas for disinfectants, etc. R125 is required to be free of other chemicals in these applications Chlorinated hydrocarbon impurities and high purity. However, in several current production methods, the crude products cannot meet the requirements. In addition to R115, the crude products also contain by-products such as R113, R114, R115, and R123 to varying degrees according to different synthesis methods. Among these by-products except R115, other by-products can be separated from R125 by means of ordinary fractionation techniques. However, R115 has a similar boiling point to R115 (the boi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/13B01J27/132B01J27/135B01J27/138B01J37/10B01J37/18B01J37/06B01J35/10B01J37/02B01J35/04C07C17/00C07C17/20C07C19/08
CPCB01J27/13B01J27/132B01J27/135B01J27/138B01J37/10B01J37/18B01J37/06B01J37/0201C07C17/00C07C17/20C07C19/08B01J35/23B01J35/56B01J35/615
Inventor 李义涛张宏清唐火强钟颖贤余航邓龙辉胡为晴吴慧娟
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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