Oxygen-Selective Adsorbent Sintering for Thermal Stability
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Solution Overview
Problem
Existing oxygen-selective adsorbents face challenges with thermal stability and oxygen adsorptivity due to the instability of barium peroxide and reactivity with other minerals or metals, leading to reduced performance over time.
Innovation Solution
The method involves sintering BaMg(CO3)2 particles with MgCO3 or Mg(OH)2 attached to their surface at high temperatures, converting them into nano-sized barium oxide and magnesium oxide, which enhances oxygen adsorption rates and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barium peroxide is used as an oxygen-selective adsorbent, then oxygen adsorptivity is initially high, but thermal stability deteriorates at high temperature causing particle sintering and gradual loss of adsorptivity
Solution Approach 1:
The patent uses a composite material system consisting of barium oxide dispersed in a magnesium oxide matrix. The magnesium oxide provides thermal stability and structural support, preventing particle sintering at high temperatures, while barium oxide maintains oxygen adsorptivity. This composite structure resolves the contradiction between initial adsorptivity and thermal stability.
Solution Approach 2:
The patent creates a heterogeneous structure where barium oxide particles are distributed within a magnesium oxide matrix. The magnesium oxide matrix provides local thermal stability and structural integrity at high temperatures, while barium oxide particles maintain local oxygen adsorptivity. This local differentiation of properties resolves the contradiction between thermal stability and adsorptivity.
2Stability of the object's composition
If barium oxide is mixed with third substrate materials to improve stability, then thermal stability increases, but use-rate of barium oxide decreases due to non-uniform protective film formation
Solution Approach 1:
The patent utilizes the porous structure of magnesium oxide as the supporting matrix, which allows barium oxide to be uniformly dispersed throughout the three-dimensional structure. This porous framework provides both thermal stability and ensures high contact between barium oxide and oxygen, maintaining high use-rate while achieving thermal stability.
Solution Approach 2:
The magnesium oxide acts as an intermediary material that provides thermal stability and structural support without forming a protective film that would block oxygen access. Instead, it creates a porous matrix that facilitates oxygen diffusion to barium oxide particles, thereby maintaining high use-rate while providing thermal stability.
3Stability of the object's composition
If barium oxide is impregnated with zirconia to improve stability, then thermal stability and heat storage increase, but oxygen adsorptivity decreases when impregnation level exceeds 20%
Solution Approach 1:
The patent changes the supporting material parameter from zirconia to magnesium oxide. Magnesium oxide provides comparable thermal stability but with a more favorable interaction with barium oxide, allowing higher dispersion levels without blocking oxygen access. This parameter change enables maintaining both thermal stability and high oxygen adsorptivity.
4Reliability
If barium oxide and magnesium oxide precursors are mixed in aqueous solution and sintered, then oxygen adsorptivity improves, but barium oxide reacts with water to form unstable barium hydroxide during sintering
Solution Approach 1:
The patent performs preliminary carbonation of barium and magnesium salts to form carbonate precursors before sintering. These carbonate precursors are more stable during the sintering process and decompose at lower temperatures to form the desired oxide mixture, avoiding the water reaction problem that would occur if hydroxide precursors were used.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in an oxygen-selective adsorbent with improved thermal stability and high oxygen adsorptivity, capable of rapid oxygen absorption and maintaining performance over time.
Implementation Method 1
sintering BaMg(CO 3 ) 2 particles or particles in which MgCO 3 or Mg(OH) 2 are attached to the outside of BaMg(CO 3 ) 2 at a high temperature
Implementation Method 2
as BaCO 3 and MgCO 3 in BaMg(CO 3 ) 2 are converted into barium oxide and magnesium oxide, respectively
Implementation Method 3
barium oxide has been used in a process of producing oxygen through an oxidation reaction shown in Chemical Formula 1, adsorbing oxygen during this process
Implementation Method 4
releasing oxygen through a reduction reaction under oxygen-free atmosphere
Data Source
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AI summary
The present invention relates to a method for preparing an oxygen-selective adsorbent for selectively adsorbing oxygen in the air. The invention provides a method for preparing an oxygen-selective adsorbent which comprises a step of preparing BaMg(CO3)2 particles or particles in which MgCO3 orMg(OH)2 are attached to the outside of BaMg(CO3)2 and a step of burning the particles at a high temperature, and the oxygen-selective adsorbent prepared thereby. The oxygen-selective adsorbent according to the invention adsorbs oxygen in the air at a fast rate compared with an existing oxygen-selective adsorbent. In addition, high thermal stability and excellent oxygen adsorptivity are ensured.