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C2 fraction gas-phase selective hydrogenation catalyst and preparation method and application thereof

A technology for selective hydrogenation and catalyst, which is applied in the fields of hydrogenation to hydrocarbon production, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. High activity and its selectivity, good dispersion, and the effect of improving utilization

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few preparation technologies at home and abroad that can control the particle size of Pd-Ag alloy nanoparticles below 10nm, and the synthesis environment is not suitable for the preparation requirements of hydrogenation catalysts.

Method used

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  • C2 fraction gas-phase selective hydrogenation catalyst and preparation method and application thereof
  • C2 fraction gas-phase selective hydrogenation catalyst and preparation method and application thereof
  • C2 fraction gas-phase selective hydrogenation catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] ① Pipette 50mgPd / mlPd(NO 3 ) 2 Solution 0.4ml, 300mgAg / ml AgNO 3 Solution 0.2ml, weigh polyvinylpyrrolidone (PVP) 800mg, dilute to 8g with deionized aqueous solution;

[0037] ②In a constant temperature water bath at 20°C, put 10g of non-ionic surfactant Brij30 and 10g of oil phase cyclohexane in a 100ml volumetric flask, stir for a certain period of time by magnetic force, then add ① into ② and stir for a certain period of time to obtain a W / O micro Lotion;

[0038] 3. Add reducing agent hydrazine hydrate, add in the microemulsion according to the mol ratio of metal salt and reducing agent in the water phase as 1:7, carry out reduction reaction, react for 8 hours;

[0039] ④ Weigh the tooth shape Al 2 o 3 Carrier 100g, impregnated with the microemulsion prepared above;

[0040] ⑤ Dried and calcined the carrier impregnated with the above-mentioned microemulsion to prepare the catalyst, and obtained the catalyst PM-1, wherein the Pd-Ag alloy content was 0.08% of th...

Embodiment 2

[0042] ① Pipette 50mgPd / mlPd(NO 3 ) 2 Solution 0.4ml, 300mgAg / ml AgNO 3 Solution 0.2ml, weigh polyvinylpyrrolidone (PVP) 800mg, dilute to 8g with deionized aqueous solution;

[0043] ②In a constant temperature water bath at 20°C, put 10g of non-ionic surfactant Brij30 and 10g of oil phase cyclohexane in a 100ml volumetric flask, stir for a certain period of time by magnetic force, then add ① into ② and stir for a certain period of time to obtain a W / O micro Lotion;

[0044] 3. Add reducing agent hydrazine hydrate, add in the microemulsion according to the mol ratio of metal salt and reducing agent in the water phase as 1:7, carry out reduction reaction, react for 8 hours;

[0045] ④ Weigh the tooth shape Al 2 o 3 Carrier 100g, impregnated with the microemulsion prepared above;

[0046] ⑤ drying and calcining the carrier impregnated with the above-mentioned microemulsion in ④ to obtain a semi-finished catalyst.

[0047] ⑥Respectively pipette 10mgLa / ml of La(NO 3 ) 3 So...

Embodiment 3

[0051] ① Pipette 0.5ml of 20mgPd / ml palladium oxalate solution, 0.5ml of 30mgAg / ml silver oxalate solution, weigh 1500mg of polyacrylamide (PAM), and dilute to 20g with deionized aqueous solution;

[0052] ②In a constant temperature water bath at 60°C, add 12g of anionic surfactant AOT and 8g of oil phase isooctane in a 100ml volumetric flask, stir for a certain period of time by magnetic force, then add ① into ② and stir for a certain period of time to obtain a W / O microemulsion ;

[0053] ③ Stir for a certain period of time, add the reducing agent sodium borohydride, add according to the molar ratio of the metal salt and the reducing agent in the water phase as 1:4, and carry out the reduction reaction for 4 hours;

[0054] ④ Weigh spherical TiO 2 Carrier 100g, impregnated with the microemulsion prepared above;

[0055] ⑤ Dried and calcined the carrier impregnated with the above-mentioned microemulsion to prepare the catalyst, and obtained the catalyst PM-3, wherein the Pd...

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Abstract

A disclosed C2 fraction gas-phase selective hydrogenation catalyst comprises a nanometer noble-metal alloy main active composition and an auxiliary active composition which are supported by a carrier; the nanometer noble-metal alloy main active composition is Pd-Ag, the content of the alloy is 0.01 wt%-0.4 wt% of the whole carrier, and the mass ratio of Pd to Ag is 1:(0.25-5); the auxiliary active composition is one or two of La, Ag, Au, Ga, Bi, Cu, Sn, Cs, Ge, Zn, Cr, rare earth elements, alkali metals and alkaline earth metals, and the content is 0.0 wt%-10.0 wt% of the whole catalyst; and the nanometer noble-metal alloy main active composition is prepared from a double-metal salt in a high-molecular polymer modified microemulsion system through a chemical reduction method, and the catalyst is obtained by loading the carrier with the main active composition. The catalyst has relatively high activity and selectivity when being applied to selective hydrogenation reaction of acetylene.

Description

technical field [0001] The present invention relates to a carbon distillate gas-phase selective hydrogenation catalyst and its preparation method and application, in particular to a supported nano-alloy selective hydrogenation catalyst and its preparation method, which is used for acetylene in the cracking product carbon distillate Select the reaction of hydrogenation to ethylene. Background technique [0002] Metal nanoparticles have excellent properties such as large specific surface area, many crystal surface defects, high surface activity, high catalytic efficiency and strong adsorption capacity, which make them have important applications in chemical catalysis. The catalytic performance of bimetallic nanoparticles as active components of catalysts is different from that of monometallic nanoparticles. The composition, structure and component distribution of the sub-particles vary. Bu et al. prepared Ru-Ba / SBA-15 catalysts with different Ru particle sizes. By changing t...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J23/68B01J23/52C07C11/04C07C5/09
CPCY02P20/52
Inventor 卫国宾彭晖戴伟李前石瑞红
Owner CHINA PETROLEUM & CHEM CORP
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