Supported Ni-Sb catalyst and preparation method and application thereof

A catalyst and supported technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unsatisfactory olefin selectivity, large catalyst demand, loss of ethylene and propylene, etc., to achieve Achieve controllable and large-scale preparation, reduce thermal effects, and inhibit agglomeration

Pending Publication Date: 2022-08-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, the Pd-based catalysts in the prior art have a high load of noble metal Pd, and the demand for the catalyst is large, resulting in high catalyst costs; Ni-based catalysts are still not ideal for olefin selectivity, which easily causes the loss of ethylene and propylene and Safety hazards such as reactor overheating

Method used

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  • Supported Ni-Sb catalyst and preparation method and application thereof
  • Supported Ni-Sb catalyst and preparation method and application thereof
  • Supported Ni-Sb catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. Preparation of Ni / Mg / Al ternary LDH material W1 by co-precipitation method

[0040] The preparation of the Ni / Mg / Al ternary LDH material of the present embodiment includes the following steps:

[0041] (1) 2.91g Ni (NO 3 ) 2 ·6H 2 O, 12.82g Mg(NO 3 ) 2 ·6H 2 O and 7.50g Al (NO 3 ) 3 ·9H 2 O was dissolved in 100 mL of deionized water and dispersed by ultrasonic, which was recorded as mixed metal nitrate solution, and the molar ratio of Ni, Mg, and Al ions was 1:5:2; 4.24 g of Na 2 CO 3 The powder was dissolved in 100 mL of ultrapure water for ultrasonic dispersion to obtain a precipitant; 10.00 g of NaOH powder was dissolved in 250 mL of ultrapure water for ultrasonic dispersion to obtain a pH adjuster.

[0042] (2) Transfer the precipitant of step (1) to a 500mL three-necked flask, and place it in an oil bath at 65°C for constant temperature treatment for 1h, and then add step (1) dropwise at a rotational speed of 120r / min The mixed metal nitrate s...

Embodiment 2

[0043] Example 2. Ni / Mg / Al ternary LDH material W2 prepared by co-precipitation method

[0044] The preparation of the Ni / Mg / Al ternary LDH material of the present embodiment includes the following steps:

[0045] (1) 1.45g Ni (NO 3 ) 2 ·6H 2 O, 7.70g Mg(NO 3 ) 2 ·6H 2 O and 1.88g Al (NO 3 ) 3 ·9H 2 O was dissolved in 100 mL of deionized water and dispersed by ultrasonic, which was recorded as mixed metal nitrate solution, and the molar ratio of Ni, Mg, and Al ions was 1:6:1; 4.24 g of Na 2 CO 3 The powder was dissolved in 100 mL of ultrapure water for ultrasonic dispersion to obtain a precipitant; 10.00 g of NaOH powder was dissolved in 250 mL of ultrapure water for ultrasonic dispersion to obtain a pH adjuster.

[0046] (2) Transfer the precipitant of step (1) to a 500mL three-necked flask, and place it in an oil bath at 50°C for constant temperature treatment for 1h, and then add step (1) dropwise at a rotational speed of 130r / min The mixed metal nitrate solution...

Embodiment 3

[0047] Example 3. Ni / Mg / Al ternary LDH material W3 prepared by co-precipitation method

[0048] The preparation of the Ni / Mg / Al ternary LDH material of the present embodiment includes the following steps:

[0049] (1) 4.36g Ni (NO 3 ) 2 ·6H 2 O, 11.54g Mg(NO 3 ) 2 ·6H 2 O and 12.66g Al (NO 3 ) 3 ·9H 2 O is dissolved in 100 mL of deionized water and dispersed by ultrasonic, which is recorded as mixed metal nitrate solution, and the molar ratio of Ni, Mg, and Al ions is 1:3:2.25; 4.24 g of Na 2 CO 3 The powder was dissolved in 100 mL of ultrapure water for ultrasonic dispersion to obtain a precipitant; 10.00 g of NaOH powder was dissolved in 250 mL of ultrapure water for ultrasonic dispersion to obtain a pH adjuster.

[0050] (2) Transfer the precipitant of step (1) into a 500mL three-necked flask, and place it in an oil bath at 70°C for constant temperature treatment for 1h, and then add step (1) dropwise at a rotational speed of 110r / min The mixed metal nitrate solu...

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Abstract

The invention discloses a supported Ni-Sb catalyst and a preparation method and application thereof, the catalyst carrier is an aluminum-magnesium metal mixed oxide MgAlOx, the supported metals are Ni and Sb, a hexagonal Ni-Sb intermetallic compound crystal structure is formed, and the active metal Ni site is isolated by the inert metal Sb site. The preparation method comprises the following steps: preparing a mixed metal nitrate solution from corresponding nitrates of metal Ni, Mg and Al, preparing a Ni / Mg / Al ternary layered hydroxide material by adopting a coprecipitation method, mechanically grinding and uniformly mixing antimony powder with the Ni / Mg / Al ternary layered hydroxide material to obtain a Ni / Sb / Mg / Al quaternary layered hydroxide material serving as a Ni-Sb intermetallic compound catalyst precursor; and preparing the supported Ni-Sb intermetallic compound catalyst through a high-temperature hydrogen heat treatment in-situ capture strategy. The catalyst is used in acetylene selective hydrogenation and propyne / propadiene hydrogenation reactions, and shows the characteristics of high ethylene / propylene selectivity and stability under the condition of complete conversion of alkyne / alkadiene.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a supported Ni-Sb catalyst and a preparation method and application thereof. Background technique [0002] As one of the important basic raw materials for modern bulk petrochemical production, ethylene and propylene are widely used in synthetic rubber, plastics, fibers, resin pesticides and medical fields. At present, their main production process is obtained by steam cracking of naphtha. The crude ethylene and propylene products obtained from the naphtha steam cracking process contain trace amounts of impurities such as alkynes and diolefins (for example, crude ethylene products contain 0.5% to 2% of acetylene), which seriously affect downstream olefin polymerization. process. Therefore, it is necessary to remove impurities such as alkynes in the crude products of ethylene and propylene, and control their content at the ppm level. At present, the main method used...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/843B01J35/00B01J37/03B01J37/18C07C5/09C07C11/04C07C5/05C07C11/06
CPCB01J23/8435B01J23/78B01J23/007B01J37/03B01J37/18C07C5/09C07C5/05B01J35/394B01J35/393C07C11/04C07C11/06Y02P20/52
Inventor 曹约强宇文强葛小虎段学志周兴贵钱刚张晶
Owner EAST CHINA UNIV OF SCI & TECH
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