In-situ Zeolite Layer Formation on Metal Substrates
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Solution Overview
Problem
Existing methods for coating substrates with zeolite layers, particularly on metal-containing substrates, face challenges such as inadequate adhesion, alteration of zeolite properties, and difficulty in achieving uniform thickness on complex three-dimensional structures, especially in heat exchanger applications, due to the use of binders and multi-step processes.
Innovation Solution
The method involves in-situ synthesis of zeolite layers on metal-containing substrates by selectively extracting cross-linking elements from the substrate during crystallization, using a deficient concentration of cross-linking elements in the suspension to promote intimate contact and chemical bonding between the zeolite layer and the substrate, thereby avoiding the use of binders and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zeolite powder is mixed with binder and applied to substrate as coating, then zeolite layer can be formed on substrate, but adhesion is insufficient and zeolite properties are altered by binder
Solution Approach 1:
The patent removes the binder from the system entirely. Instead of using binders to hold zeolite particles together, the invention uses aluminum atoms from the substrate itself as cross-linking agents during in-situ crystallization, eliminating the need for external binding molecules that would alter zeolite properties or provide insufficient adhesion.
Solution Approach 2:
The substrate serves dual purposes: it provides the structural support and simultaneously donates aluminum atoms for zeolite formation. The aluminum in the substrate acts as cross-linking elements during crystallization, creating self-anchoring zeolite structures without requiring external binders or additives.
2Manufacturing precision
If multi-step procedure is used for zeolite coating, then zeolite layer can be applied to substrate, but process complexity increases and uniform thickness is difficult to achieve on complex structures
Solution Approach 1:
The patent combines multiple functions into a single in-situ crystallization step: substrate preparation, zeolite nucleation, crystal growth, and layer formation all occur simultaneously in one process. This eliminates the need for separate coating, drying, and curing steps required in conventional methods.
Solution Approach 2:
The invention uses controlled hydrothermal treatment parameters (temperature, time, pH) to directly influence crystal growth and layer formation. By adjusting these parameters during the single crystallization step, uniform thickness can be achieved on complex three-dimensional structures without multiple coating cycles.
3Strength
If binders are used in zeolite coating, then zeolite particles can be held together, but binding molecules settle on zeolite surface and change relevant properties
Solution Approach 1:
The patent completely eliminates binders from the system. Mechanical stability is achieved not through binding molecules but through the formation of anchoring bonds between aluminum atoms in the substrate and the developing zeolite crystals during in-situ crystallization.
Solution Approach 2:
The invention creates a composite structure where the zeolite layer is chemically integrated with the substrate through aluminum cross-linking. This composite approach provides mechanical stability through the unified aluminum-zeolite network rather than through separate binding 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 approach ensures a mechanically stable, uniformly oriented zeolite layer with unobstructed access to its microporous structure, maintaining zeolite properties and achieving reliable adhesion on complex substrates with reduced process steps and improved thermal contact.
Implementation Method 1
in-situ synthesis of zeolite layers on metal-containing substrates by selectively extracting cross-linking elements from the substrate during crystallization
Implementation Method 2
selectively extracting cross-linking elements from the substrate during crystallization, using a deficient concentration of cross-linking elements in the suspension to promote intimate contact and chemical bonding
Implementation Method 3
zeolites are able to store large quantities of water and release them again when heated. Zeolite materials in contact with a heat exchanger are, therefore, particularly suited to build up a latent heat accumulator
Implementation Method 4
the working medium usually referred to as sorbate must be supplied to the zeolite as sorbent material in an effective manner
Implementation Method 5
zeolites are able to store large quantities of water and release them again when heated
Implementation Method 6
zeolites are used as molecular sieves. In this case, too, the zeolite material can be introduced into a filter system in the form of a loose bulk of crystals or molded materials
Data Source
AI summary
The invention relates to a method for production of a zeolite layer on a substrate containing metal, comprising the following method steps: production of an aqueous suspension, comprising several components, one component comprises at least one cross-linking element from the third, fourth or fifth main group of the periodic table, the substrate containing metal comprises at least one of the cross-linking elements, introduction of the substrate containing metal to the aqueous suspension, heating the aqueous suspension and the substrate containing the metal present therein for the in-situ crystallisation of a zeolite layer on the substrate containing metal, whereby the cross-linking elements in the substrate containing metal are extracted and included in the zeolite layer, a cross-linking element present in the suspension for formation of the zeolite layer is present at a concentration so low that a crystallisation in the suspension is largely or completely avoided and said element is principally provided by the substrate.