A self-supporting catalyst having a core-shell structure, a preparing method thereof and applications of the catalyst

A catalyst and self-supporting technology, applied in the field of catalysis, can solve problems such as low pressure drop, and achieve the effects of easy molding, controllable overall structure, and easy access to raw materials

Pending Publication Date: 2018-01-05
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research and development of new catalysts and reactor technologies for high-efficiency catalytic oxidation of CO and unburned hydrocarbons and their derivatives at low temperature, high flux and low pressure drop, strong thermal shock resistance and long service life, and suitable for modular preparation, It is still a challenging hot topic in the field of environmental catalysis

Method used

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  • A self-supporting catalyst having a core-shell structure, a preparing method thereof and applications of the catalyst
  • A self-supporting catalyst having a core-shell structure, a preparing method thereof and applications of the catalyst
  • A self-supporting catalyst having a core-shell structure, a preparing method thereof and applications of the catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Take 5 grams of foamed nickel, treat it with 1wt% dilute nitric acid for 10 minutes, wash it with distilled water and put it into a stainless steel hydrothermal kettle, add 0.714 grams of sodium metaaluminate (NaAlO 2 ) and 2.016 grams of urea (NH 2 CONH 2 ) mixed solution 70 milliliters, hydrothermal treatment at 120 ℃ for 12 hours. After cooling down to room temperature, wash with distilled water for several times and dry to obtain a self-supporting AlOOH / Ni-foam composite carrier containing abundant surface hydroxyl groups and anchoring flaky pseudo-boehmite;

[0056] 2, take by weighing 5 grams of the self-supporting AlOOH / Ni-foam composite carrier that step 1 makes, use Pd(NO 3 ) 2and 0.352 grams of γ-(methacryloyloxy)propyltrimethoxysilane (KH570) in acetone solution, at room temperature for 4 hours equal-volume impregnation, after drying, in nitrogen at 550 ° C roasting for 2 hours, that is γ-Al 2 o 3 Pd@SiO loaded on the nickel foam support 2 Core-shel...

Embodiment 2

[0068] 1, with the step 1 of embodiment 1;

[0069] 2, take by weighing 5 grams of the self-supporting AlOOH / Ni-foam composite carrier that step 1 makes, use Pd(NO 3 ) 2 , 0.125 g CeO 2 Ce(NO 3 ) 2 and 0.717 g of KH570 in acetone solution, at room temperature for 4 hours of equal volume impregnation, after drying, in nitrogen at 550 ° C for 2 hours to obtain anchored γ-Al 2 o 3 Pd-CeO supported on the nickel foam support 2 @SiO 2 Core-shell catalysts.

[0070] Through the measurement of inductively coupled plasma atomic emission spectrometry, it is known that in the prepared catalyst, the mass content of Pd is 0.45%, CeO 2 The mass content is 2.54%, SiO 2 The mass content is 3.23%, Al 2 o 3 The mass content of is 5.91%; Therefore, the catalyst prepared in this embodiment is abbreviated as: 0.5Pd-2.5CeO 2 @3.2SiO 2 / 6Al 2 o 3 / Ni-foam.

[0071] According to the macroscopic measurement, the self-supporting core-shell structure catalyst prepared in this implementa...

Embodiment 3

[0074] 1. Take 5 grams of sintered aluminum fiber (fiber diameter 50 microns) sheet, treat it with 1 wt% sodium hydroxide aqueous solution for 10 minutes, wash it with distilled water, put it into a stainless steel hydrothermal kettle, add 70 milliliters of distilled water, and Hydrothermal treatment at 120°C for 12 hours. After cooling down to room temperature, wash with distilled water several times and dry to obtain a self-supporting AlOOH / Al50-SMF composite carrier containing abundant surface hydroxyl groups and anchoring flaky pseudo-boehmite;

[0075] 2. Take 5 grams of the self-supporting AlOOH / Al50-SMF composite carrier prepared in step 1, and use Pd(NO 3 ) 2 and 0.208 g of silane coupling agent KH550 in acetone solution, at room temperature for equal volume impregnation for 4 hours, after drying, in nitrogen at 550 ° C for 2 hours to obtain anchored γ-Al 2 o 3 Pd@SiO supported on aluminum fiber support 2 Core-shell catalysts.

[0076] Through inductively coupled ...

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Abstract

A self-supporting metal or metal oxide catalyst having a core-shell structure is disclosed. The general formula of the catalyst is xM-yMO@zShell / mAlO / ZT, wherein the x is 0-5% by mass, the y is 0-10%by mass, the z is 0.5-20% by mass, the m is 0.1-20% by mass, and the catalyst includes the M, the Mo, the Shell and the AlO, with the balance being the ZT. The catalyst is prepared by a method including (1) a step of subjecting the ZT to hydrothermal treatment and / or thermal treatment in pure water or an aqueous solution containing an aluminum source and an alkali source to prepare a self-supporting AlO / ZT composite carrier, and (2) a step of soaking the prepared AlO / ZT carrier by utilizing an organic solution containing at least one metal M ion and coordinated with a coupling agent, and performing drying, calcination and reduction to prepare the catalyst. The catalyst can be used for catalytic oxidation of low-concentration methane and volatile organic compounds (VOCs), catalytic oxidation of carbon monoxide, lower olefin preparation from synthetic gas (FTO), and methane conversion to prepare synthetic gas.

Description

technical field [0001] The invention relates to a self-supporting metal or oxide core-shell structure catalyst and its preparation method and application, belonging to the technical field of catalysis. Background technique [0002] Metal nanoparticle catalysts are unavoidable in petroleum refining, production of petrochemicals and fine chemicals, exhaust gas purification, and production of renewable clean energy. The volume effect, surface effect, quantum size effect and macroscopic quantum tunneling effect of nanoparticles make the catalytic activity and selectivity of nanocatalysts much higher than that of traditional catalysts, such as gold nanocatalysts with a particle size of less than 2 nanometers. CO oxidation, CO can be completely converted at room temperature (Natural Gas Chemical Industry, 2009, 34(3): 72-78); use a nickel nanocatalyst with a particle size of 30 nm as the hydrogenation reaction of cyclooctadiene to generate cyclooctene The selectivity of the catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/50B01J23/60B01J23/745B01J23/889B01J23/89B01D53/86B01D53/62B01D53/72C01B3/40
CPCY02P20/52Y02A50/20
Inventor 路勇张巧飞赵国锋柴瑞娟潘霞霞刘晔何鸣元
Owner EAST CHINA NORMAL UNIV
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