Phase Change Catalyst Support for Uniform Hydrogen Release
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Solution Overview
Problem
Existing hydrogen storage systems face challenges in efficient and uniform heating of catalysts during dehydrogenation, leading to energy inefficiencies and potential catalyst deactivation due to hot spots, particularly in mobile applications where dynamic heat management is crucial.
Innovation Solution
A catalyst support with a phase change material inner core, a metal oxide enveloping layer, and a catalytically active layer, combined with a supporting layer, allows for controlled heat management and distribution, preventing overheating and ensuring optimal reaction conditions through a loop reactor design with inductive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heating methods are used for catalyst dehydrogenation, then hydrogen release can be achieved, but energy efficiency decreases and catalyst deactivation occurs due to hot spots
Solution Approach 1:
The patent employs phase-change materials (PCMs) that undergo phase transitions at specific temperatures to absorb and release heat. During dehydrogenation, the PCM absorbs excess heat when transitioning from solid to liquid phase, preventing hot spots. During hydrogen release, the PCM releases stored heat when transitioning from liquid to solid phase, maintaining optimal reaction temperature. This phase transition mechanism enables efficient thermal management without continuous external heating, significantly improving energy efficiency while preventing catalyst deactivation.
Solution Approach 2:
The patent utilizes the temperature-dependent phase change properties of PCMs to dynamically adjust the thermal environment of the catalyst. By selecting PCMs with specific phase change temperatures matching the optimal dehydrogenation range, the system automatically regulates temperature parameters. This parameter-based control allows the catalyst to operate at optimal temperatures without requiring complex external control systems, thereby improving energy efficiency and preventing thermal runaway.
2Productivity
If high temperatures are applied for dehydrogenation, then hydrogen release is accelerated, but catalyst deactivation occurs due to hot spots
Solution Approach 1:
The phase-change materials are selected to undergo phase transitions precisely at the optimal dehydrogenation temperature range. When the temperature rises above the optimal range, the PCM absorbs excess heat during phase transition, preventing hot spot formation and catalyst deactivation. This creates a self-regulating thermal environment that maintains catalyst stability while enabling high dehydrogenation rates.
Solution Approach 2:
The PCM acts as a thermal intermediary between the exothermic dehydrogenation reaction and the catalyst. It buffers temperature fluctuations by absorbing and releasing heat during phase transitions, thereby protecting the catalyst from thermal stress while maintaining the temperature conditions necessary for high dehydrogenation activity. This intermediary function decouples the relationship between reaction rate and catalyst temperature, allowing high productivity without compromising catalyst reliability.
3Reliability
If uniform heat distribution is achieved, then catalyst life is extended, but energy input requirements increase
Solution Approach 1:
The phase-change materials enable the system to self-regulate its thermal environment without requiring continuous external energy input. The PCMs automatically absorb excess heat when temperature rises and release heat when temperature drops, creating a self-balancing thermal system. This self-service mechanism extends catalyst life through uniform heat distribution while minimizing external energy requirements, as the thermal management is handled autonomously by the PCM's phase transition properties.
Data Source
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AI summary
The invention relates to a catalyst support comprising: at least one inner core (4) containing or consisting of at least one phase change material; a coating layer (2) around the inner core, which layer contains or consists of at least one metal oxide; and a catalytically active layer (1) lying in the interstices of the coating layer (2) and/or on said coating layer (2). At least one catalytically active substance is contained in the catalytically active layer (1) and the catalyst support also has a support layer (3) arranged below the coating layer (2). The invention also relates to a recycle reactor and a method for releasing hydrogen from a chemical hydrogen store.