Fine regulation supported alloy catalyst and preparation method and application thereof

An alloy catalyst and a supported technology are applied in the field of finely regulated supported alloy catalysts and their preparation, which can solve problems such as low activity and achieve the effects of easy availability of raw materials, reduced material cost, and 100% hydrogen production selectivity.

Active Publication Date: 2021-03-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the heterogeneous catalytic reaction occurs on the surface of the catalyst, and its catalytic performance is mainly determined by the surface rather than the bulk behavior. For example, the Ni-Pt / CeO 2 Catalyst, at 30°C, the reaction rate can reach 353h -1 , although the apparent activity is good, but the actual intrinsic activity is very low

Method used

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  • Fine regulation supported alloy catalyst and preparation method and application thereof
  • Fine regulation supported alloy catalyst and preparation method and application thereof
  • Fine regulation supported alloy catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The preparation of the catalyst can be divided into three steps of hydrothermal-electrostatic adsorption-reduction heat treatment. The first step: 2mmol of Ce(NO 3 ) 3 ·6H 2 O and 0.2mmol Ni(NO 3 ) 2 ·6H 2 O was completely dissolved in 20ml of ethanol solution, stirred in a constant temperature water bath at 60°C, another 6.5mmol of tetramethylammonium hydroxide (TMAH) was completely dissolved in 5mL of ethanol solution, and then added dropwise to the metal precursor salt solution, The reaction was stirred at 60°C for 2h. Then the reaction solution was transferred to a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, and aged at a constant temperature of 80° C. for 12 h. Then, the solid solution CeNi can be obtained by centrifugal washing and drying. 0.1 o x ; Second step: use hydrochloric acid or sodium hydroxide solution to H 2 PtCl 6 or [Pt(NH 3 ) 4 ] Cl 2 The initial pH value of the solution (1mM) was adjusted to about 3.5 (the final pH val...

Embodiment 2

[0066] (1) Preparation of catalyst:

[0067] In order to further explore the universality of the above method, try to change the solute metal and noble metal in the solid solution, the specific metal used and the content are: Co(NO 3 ) 2 ·6H 2 O (0.2mmol), H 2 IrCl 6 ·6H 2 O (0.044mmol), preparation condition is the same as embodiment 1, can obtain target catalyst sample Co 0.10 Ir 0.022 / CeO 2 , the prepared catalyst samples were stored in a glove box filled with an Ar atmosphere to minimize oxidation.

[0068] (2) Phase and structural characterization of the catalyst:

[0069] Figure 8 For this embodiment in the obtained target catalyst Co 0.10 Ir 0.022 / CeO 2 and its precursor CeCo 0.10 o x X-ray diffraction pattern of . Both samples were found to exhibit CeO by XRD characterization 2 phases, but no Ni, Ir, or Ni-Ir alloy phases were observed, indicating that the catalyst particles prepared by this method were extremely small in size or in an amorphous phas...

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Abstract

The invention belongs to the field of irreversible hydrogen storage materials, and discloses a fine regulation supported alloy catalyst and a preparation method and application thereof. The catalyst comprises a metal alloy active phase and a metal oxide matrix phase, wherein the metal alloy active phase is highly dispersed on the surface of the metal oxide matrix phase in the form of ultra-small nanoparticles. The preparation method comprises the following steps: adjusting the pH values of solutions of different precious metal precursor salts according to needs, adsorbing a single layer of theprecious metal precursor salts on a solid solution substrate, and carrying out a heat treatment reaction on the obtained product in a reducing atmosphere to obtain the high-dispersion nano-alloy catalyst. The preparation method has the advantages of easily available raw materials, simple process and easiness in mass production. The prepared catalyst has high intrinsic catalytic activity, rich active sites and excellent stability, and can efficiently catalyze hydrazine hydrate to decompose to produce hydrogen under alkaline conditions.

Description

technical field [0001] The invention belongs to the field of irreversible hydrogen storage materials, and in particular relates to a finely regulated supported alloy catalyst and its preparation method and application. Background technique [0002] Energy shortage, environmental pollution and global warming have brought unprecedented challenges to the sustainable development of human society. Optimizing the energy structure and developing and utilizing high-efficiency conversion technologies are important ways to solve the current crisis. Hydrogen is a clean and efficient renewable energy. The utilization of hydrogen energy is very important to the development of "hydrogen economy". Research and development of hydrogen storage materials with high hydrogen storage performance and large-scale application prospects are the prerequisites for the efficient utilization of hydrogen energy. . According to different hydrogen charging and discharging methods, hydrogen storage materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/02B01J37/10B01J37/34B01J37/18B01J37/03C01B3/04
CPCB01J23/894B01J35/0066B01J35/0013B01J35/023B01J37/10B01J37/342B01J37/18B01J37/031C01B3/04Y02E60/36
Inventor 王平施青
Owner SOUTH CHINA UNIV OF TECH
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