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Multi-metallic catalyst for catalyzing reforming reaction and preparation method of multi-metallic catalyst

A multi-metal catalyst and catalytic reforming technology, which is applied in the direction of naphtha catalytic reforming, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of deactivation and low activity , to achieve the effect of enhanced reforming performance and excellent catalytic performance

Inactive Publication Date: 2014-11-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of non-noble metal catalysts is still different from that of noble metal catalysts such as Pt and Pd. Many people have studied the addition of non-noble metals to noble metals. The most researched is the catalyst of PtNi metal supported on molecular sieves. Ni / HUSY catalyst activity is 17.5% lower, and the deactivation is severe, and the catalytic performance is the best when the Ni-Pt / HUSY catalyst contains 20%-30% Pt ( M H etal.Appl.Catal.A:Gen.,2007,319:1-6), mainly due to the improvement of metal dispersion and the electronic effect between metals

Method used

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  • Multi-metallic catalyst for catalyzing reforming reaction and preparation method of multi-metallic catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step A: Configure Zn 2+ +Ni 2+ +Cu 2+ The concentration is 1.5mol / L, the molar ratio of Cu / Ni synthesized is 1:1, Ni 2+ The molar concentration of 0.3mol / L, the mixed solution of urea concentration 3mol / L, under the condition of vacuum, add 2g of dry γ-Al to the above mixed solution 2 o 3 , impregnated for 1 hour, transferred the above materials to an autoclave, crystallized at 100°C for 12 hours, filtered and washed with suction, 4 times with deionized water and 3 times with absolute ethanol, dried at 50°C for 12 hours, and the yield was about 2.30g.

[0022] Step B: 0.5g Ni-Cu-Zn-Al-CO 3 -LDHs / Al 2 o 3 Put it into the micro-reflector evaluation device, raise the temperature to 500°C at 5°C / min, and oxidize and heat for 4 hours in a dry air atmosphere with a flow rate of 60ml / min; 2 Flow rate 100ml / min purge 1h; H 2 Flow rate 60ml / min reduction 4h.

[0023] Step C: Utilize the micro-injection pump to pump n-heptane into it, and simultaneously adjust the pressu...

Embodiment 2

[0025] Step A: Configure Zn 2+ +Ni 2+ +Cu 2+ The concentration is 1.5mol / L, the molar ratio of Cu / Ni synthesized is 0.5:1, Ni 2+ The molar concentration of 0.3mol / L, the mixed solution of urea concentration 3mol / L, under the condition of vacuum, add 2g of dry γ-Al to the above mixed solution 2 o 3 , impregnated for 1 hour, transferred the above materials to an autoclave, crystallized at 100°C for 12 hours, filtered and washed with suction, 4 times with deionized water and 3 times with absolute ethanol, dried at 50°C for 12 hours, and the yield was about 2.30g.

[0026] Step B: Ni-Cu 0.5 -Zn-Al-CO 3 -LDHs / Al 2 o 3 (Cu / Ni ratio 0.5 / 1) supported Pt salt on the precursor, with Pt(C 5 h 7 o 2 ) 2 is the Pt precursor, acetone is the solvent, and the synthesized hydrotalcite precursor is dried. Under vacuum conditions, the prepared Pt solution of appropriate concentration is added to the dry carrier, and the hydrotalcite carrier is weighed. 1g, the Pt precursor is 0.0043 ...

Embodiment 3

[0030] Step A: Ni-Cu-Zn-Al-CO 3 -LDHs / Al 2 o 3 (Cu / Ni ratio 1 / 1) supported Pt salt on the precursor, with Pt(C 5 h 7 o 2 ) 2 is the Pt precursor, acetone is the solvent, and the synthesized hydrotalcite precursor is dried. Under vacuum conditions, the prepared Pt solution of appropriate concentration is added to the dry carrier, and the hydrotalcite carrier is weighed. 1g, the Pt precursor is 0.0043 g was dissolved in 0.2ml of acetone solvent, loaded by incipient wetness method, impregnated for 12h, and dried in an oven at 120°C to constant weight.

[0031] Step B: 0.5g Pt(C 5 h 7 o 2 ) 2 / Ni-Cu-Zn-Al-CO 3 -LDHs / Al 2 o 3 Put it into the micro-reflector evaluation device, raise the temperature to 500°C at 5°C / min, and oxidize and heat for 4 hours under the atmosphere of dry air at a flow rate of 60ml / min; 2 Flow rate 100ml / min purge 1h; H 2 Flow rate 60ml / min reduction 4h.

[0032] Step C: Use a micro-sampling pump to pump n-heptane, while adjusting the pressure ...

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Abstract

The invention relates to a multi-metallic catalyst for catalyzing reforming reaction and a preparation method of the multimetallic catalyst, belonging to the technical field of catalysts. The catalyst is prepared from nickel-copper and platinum nanoparticles, aluminum oxide particles and a composite oxide carrier, wherein the nickel-copper and platinum nanoparticles are uniformly dispersed, and the composite oxide carrier is formed by calcining LDHs (Layered Double Hydroxides). A synergistic effect exists between metals, and the reforming performance of the catalyst can be effectively improved. The catalyst uses bimetallic composite hydroxides which are also known as Layered Double Hydroxides(LDHs) or LDHs loaded with a small amount of platinum as a catalyst precursor, and the molar ratio of Cu<2+> and Ni<2+> in divalent ions of a LDHs layer board is 0.5-3. The catalyst precursor is subjected to calcination reduction to obtain the catalyst. N-heptane is utilized for detecting the reforming performance of the catalyst, the highest n-heptane conversion rate is 85 percent, the methylbenzene selectivity is 16 percent, and the highest heterogeneous selectivity is 39 percent.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular provides a catalyst capable of catalyzing the synergistic action of multiple metals in a reforming reaction and a preparation method thereof. Background technique [0002] Catalytic reforming is one of the most important methods used in the petroleum refining industry to increase the octane number of gasoline, produce aromatic compounds and by-product hydrogen. At present, the reforming catalyst widely used in industry is a supported Pt metal catalyst, but Pt is expensive and requires high content of raw materials, especially sulfur and nitrogen. Non-precious metal reforming catalysts have always been one of the research hotspots in the field of catalytic reforming. . [0003] Among non-noble metals, Ni and Co are the most commonly used metals, and they are mainly loaded on molecular sieves to obtain catalysts. Lugstein et al. found that (Lugstein A etal.Appl.Catal.A:Gen.,19...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/89C10G35/06C10G35/09
Inventor 何静杨明环
Owner BEIJING UNIV OF CHEM TECH
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