Catalyst for alkane isomerization, and preparation method and application thereof

A catalyst and isomerization technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve poor selectivity and stability, complex operation, weak catalyst acidity and other problems, to achieve the effects of high activity and stability, safe preparation method, and improved liquid yield

Inactive Publication Date: 2018-09-07
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although aluminum chloride has high activity and relatively low reaction temperature, its selectivity and stability are poor, and there are also corrosion and pollution problems.
Later, Ni-SiO 2 -Al 2 o 3 , Pt / Cl-Al 2 o 3 The introduction of such solid heterogeneous catalysts overcomes the shortcomings of liquid acid catalysts, with better activity and lower reaction temperature, but the selectivity of non-noble metal catalysts is poor, and noble metal catalysts are easily poisoned
In addition, the acidity of the catalyst supported by alumina is too weak, and it is necessary to continuously add an appropriate amount of chloride additives during the reaction process to maintain low-temperature activity, and the operation is complicated.
At present, Pt-containing H-MOR catalysts are widely used industrial catalysts, but they still have not completely overcome the above shortcomings

Method used

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  • Catalyst for alkane isomerization, and preparation method and application thereof
  • Catalyst for alkane isomerization, and preparation method and application thereof
  • Catalyst for alkane isomerization, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select 100g specific surface area as 135m 2 Dissolve 10g of phosphotungstic acid in water, then pour it into the silica pellets and soak for 2 hours, take it out and dry it naturally, and then bake it in a muffle furnace for 3 hours. The temperature is 400°C, take it out and cool down naturally.

[0026] Dissolve 0.6g of palladium chloride and 1g of gallium nitrate in dilute hydrochloric acid, adjust the pH value of the solution to 1, pour the carrier after natural cooling into the prepared above solution, soak for 2 hours, and put it into the muffle furnace Calcined for 5 hours at a temperature of 450° C. to prepare an alkane isomerization catalyst.

[0027] Using a structure such as figure 1 In the fixed-bed reactor shown, take 50ml of the obtained catalyst and place it in a Φ25×2.5mm fixed-bed reactor, use n-hexane as raw material at a reaction temperature of 230°C, a pressure of 1.2MPa, and a space velocity of 0.5h -1 The isomerization reaction was carried out un...

Embodiment 2

[0029] Select 100g specific surface area as 160m 2 / g of silica pellets as a carrier, 10g of phosphomolybdic acid was dissolved in water, then poured into the silica pellets and soaked for 2 hours, taken out and air-dried naturally, then roasted in a muffle furnace for 3 hours, and then roasted The temperature is 450°C, take it out and cool down naturally.

[0030] Dissolve 0.5g of palladium chloride and 0.8g of gallium nitrate in dilute hydrochloric acid, adjust the pH value of the solution to 2, pour the carrier after natural cooling into the prepared above solution, soak for 2 hours, and put it into the muffle furnace Medium calcination for 5 hours at a calcination temperature of 500°C to prepare an alkane isomerization catalyst.

[0031] Using a structure such as figure 1 In the fixed-bed reactor shown, take 50ml of the obtained catalyst and place it in a Φ25×2.5mm fixed-bed reactor, use n-heptane as raw material at a reaction temperature of 260°C, a pressure of 1.5MPa, ...

Embodiment 3

[0033] Select 100g specific surface area as 145m 2 / g of silica pellets as a carrier, 10g of phosphomolybdic acid was dissolved in water, then poured into the silica pellets and soaked for 2 hours, taken out and air-dried naturally, then roasted in a muffle furnace for 4 hours, and then The temperature is 500°C, take it out and cool down naturally.

[0034] Dissolve 0.6g of palladium chloride and 1.1g of gallium nitrate in dilute hydrochloric acid, adjust the pH value of the solution to 3, pour the carrier after natural cooling into the prepared above solution, soak for 2 hours, and put it into the muffle furnace Medium calcination for 4 hours at a calcination temperature of 500°C to prepare an alkane isomerization catalyst.

[0035] Using a structure such as figure 1 In the fixed-bed reactor shown, take 50ml of the obtained catalyst and place it in a Φ25×2.5mm fixed-bed reactor, use n-heptane as raw material at a reaction temperature of 260°C, a pressure of 1.5MPa, and a sp...

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Abstract

The invention specifically relates to a catalyst for alkane isomerization, and a preparation method and application thereof, belonging to the technical field of catalysts. The catalyst for alkane isomerization comprises the following chemical components by mass: 0.1 to 0.5% of palladium, 0.1 to 0.5% of gallium and 2 to 10% of heteropoly acid, with the balance being silica, wherein heteropoly acidis one or more selected from the group consisting of phosphotungstic acid and phosphomolybdic acid. The catalyst for alkane isomerization in the invention is prepared by loading heteropoly acid onto silica pellets and carrying out modification with the noble metals palladium and gallium, and has a proper specific surface area, specific pore volume, activity and high stability. When the catalyst isapplied to an isomerization reaction, the isomerization rate and liquid yield of the catalyst are greatly improved compared with conventional catalysts, wherein the isomerization rate is greater than59.3%, and the liquid yield is greater than 95.7%; so the catalyst is suitable for industrial promotion. The preparation method of the invention is safe, environmentally friendly and simple.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for alkane isomerization and its preparation method and application. Background technique [0002] The isomerization of normal hydrocarbons is one of the important reactions in the petrochemical industry, and isomerized hydrocarbons have a wide range of uses. For example, the conversion of n-butane to isobutane can be used to synthesize alkylated gasoline, and can also be used to dehydrogenate to produce isobutene, which in turn can be used to produce polymers. Another example is the isomerization of C5-C8 normal paraffins, which can be used to produce high-octane gasoline components and so on. [0003] Early use of isomerization catalyst H 2 SO 4 Although HF and HF have strong acidity and low reaction temperature, they are highly corrosive and toxic. In the 1960s, anhydrous aluminum chloride was used as an isomerization catalyst. Although aluminum c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18B01J35/08C10G45/62
CPCB01J27/188B01J27/19B01J35/08C10G45/62C10G2300/70C10G2400/02
Inventor 侯磊孙丛丛杨忠梅朱相春吕爱梅
Owner CHINA PETROLEUM & CHEM CORP
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