Active Aluminosilicate Preparation for Hierarchical Molecular Sieves
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Solution Overview
Problem
Existing methods for synthesizing molecular sieves from natural aluminosilicate minerals are energy-intensive, lead to equipment adhesion issues, and result in low reactivity and inefficient use of carbon particles as mesoporous templates, limiting the production of hierarchical molecular sieves with adequate macropores and mesopores.
Innovation Solution
A method involving mixing natural aluminosilicate minerals with organic acid salts and alkali metal hydroxide solutions, followed by depolymerization and carbonization in a spray drier to produce a function type active aluminosilicate that serves as both silicon and aluminum sources and a mesoporous template for hierarchical molecular sieves, utilizing a spray dryer to disperse the mixture into droplets for efficient depolymerization and carbonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature thermal activation is used to depolymerize natural aluminosilicate minerals, then chemical reactivity is improved, but energy consumption increases and mineral utilization rate decreases
Solution Approach 1:
The patent changes the activation parameters from high-temperature thermal activation to low-temperature alkali activation (100-200°C), fundamentally altering the activation mechanism to reduce energy consumption while maintaining effectiveness. The alkali metal hydroxide solution creates a chemically active environment that depolymerizes the mineral structure at lower temperatures.
Solution Approach 2:
The patent introduces alkali metal hydroxide solution as an intermediary substance that mediates the depolymerization process. This intermediary facilitates the breakdown of Si-O and Al-O bonds in the natural aluminosilicate minerals, enabling effective activation without requiring high-temperature thermal treatment.
2Reliability
If alkali fusion activation is used to depolymerize natural aluminosilicate minerals, then chemical reactivity is improved, but energy consumption increases and diffusion rate decreases
Solution Approach 1:
The patent modifies the activation parameters by using alkali metal hydroxide solution at lower temperatures (100-200°C) compared to traditional alkali fusion methods that require temperatures above the melting point of alkali. This parameter change reduces energy consumption while maintaining the depolymerization effect.
Solution Approach 2:
The patent employs alkali metal hydroxide solution as an intermediary that facilitates depolymerization through chemical action rather than requiring high-temperature fusion. The solution-based approach improves diffusion rates compared to solid alkali fusion while achieving the same activation effect.
3Ease of manufacture
If natural aluminosilicate minerals are directly used for synthesis, then production cost decreases, but chemical reactivity is insufficient
Solution Approach 1:
The patent applies preliminary activation treatment to the natural aluminosilicate minerals before using them in molecular sieve synthesis. By pre-treating the minerals with alkali metal hydroxide solution to depolymerize them into high-reactivity oligomeric aluminosilicates, the material is prepared in advance to ensure sufficient chemical reactivity for subsequent synthesis reactions.
Solution Approach 2:
The patent changes the chemical state parameters of the natural aluminosilicate minerals through alkali activation, transforming them from low-reactivity crystalline structures to high-reactivity oligomeric forms. This parameter change enables the cost-effective natural minerals to achieve the necessary reactivity for molecular sieve synthesis.
4Adaptability or versatility
If carbon particles are used as mesoporous template agents, then hierarchical molecular sieve synthesis is enabled, but utilization efficiency is low
Solution Approach 1:
The patent merges the carbonization step with the activation step by carbonizing the organic acid salt in-situ during the alkali activation process. This integration ensures that carbon particles are generated simultaneously with the activated aluminosilicate, ensuring uniform distribution and high utilization efficiency as mesoporous template agents.
Solution Approach 2:
The patent uses organic acid salt as an intermediary that serves dual purposes: it acts as a carbon source for carbon particle formation and facilitates the alkali activation process. This intermediary approach ensures that carbon particles are formed in-situ during activation, maximizing their utilization efficiency as template agents.
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 method reduces energy consumption, avoids equipment adhesion, enhances the reactivity of silicon and aluminum species, and improves the utilization efficiency of carbon particles, enabling the synthesis of hierarchical molecular sieves suitable for catalytic reactions with improved reactant diffusion and selectivity.
Implementation Method 1
the silicon-oxygen polyhedrons and the aluminum-oxygen polyhedrons in them are depolymerized into an oligomeric aluminosilicate with high reactivity
Implementation Method 2
the natural aluminosilicate minerals are calcined at high temperature to destroy Si—O bond and Al—O bond in a crystal structure to improve their reactivity
Implementation Method 3
an organic acid salt and an alkali metal hydroxide solution are mixed and pulped, and then the natural aluminosilicate mineral and the organic acid salt in slurry are respectively depolymerized and carbonized in a spray drier
Data Source
AI summary
The disclosure provides a preparation method and use of function type active aluminosilicate. The method comprises the steps: mixing and pulping a natural aluminosilicate mineral, an organic acid salt and an alkali metal hydroxide solution, and respectively depolymerizing and carbonizing the natural aluminosilicate mineral and the organic acid salt in slurry in a spray drier. The prepared aluminosilicate can be used for synthesis of a hierarchical molecular sieve in which the contained high-active silica and alumina species provide the silicon and aluminum sources for synthesizing the hierarchical molecular sieve, and the contained carbon particles serve as mesoporous template agent for synthesizing the hierarchical molecular sieve. According to the disclosure, the depolymerization time of the natural aluminosilicate mineral is obviously shortened, and the continuous depolymerization of the aluminosilicate mineral can be realized, thereby facilitating large-scale production; and meanwhile the carbon particles in the material prepared in the disclosure are highly dispersed in the active aluminosilicate, thereby effectively avoiding a problem that the carbon material is easily separated from a silica and alumina raw material when serving as the mesoporous template for synthesis of the molecular sieve so as to provide an efficient and feasible method for the synthesis of hierarchical molecular sieve.