Thin-Bed Photoreactor Layout for Beyond-Equilibrium Reactions

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Solution Overview

Problem

Conventional thermocatalytic reactors are limited by thermal equilibrium and linear energy-dependency, leading to inefficiencies in chemical reactions, and photocatalysis using optically-active metal catalysts under photon illumination is not adequately addressed by existing reactor designs.

Innovation Solution

A vertically arranged photoreactor with a thin, horizontally arranged photocatalyst bed and short gas flow residence time, powered by renewable energy sources, utilizing LED arrays or other lighting devices to induce photocatalytic reactions with a controlled temperature gradient for enhanced efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional thermocatalytic reactor designs are used, then thermal equilibrium is maintained, but reaction efficiency is limited by linear energy-dependency

Engineering Contradiction:

Improvereaction efficiencyVSAvoidenergy efficiency

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent replaces the conventional thermal energy input system with a photocatalytic system that uses light energy (photons) to drive chemical reactions. The lighting source illuminates the catalyst bed, inducing electronic excitations and vibronic transitions in surface adsorbates, enabling reactions to proceed beyond thermal equilibrium limits and achieving higher reaction rates with improved energy efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the energy input parameter from thermal energy (heat) to optical energy (light). By using photon illumination in the ultraviolet-to-visible-light spectrum, the system accesses different reaction pathways and energy states, creating a non-thermal energy transfer mechanism that accelerates dissociation and desorption events while reducing the energy barrier for chemical reactions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If catalyst bed height-to-diameter ratio is increased to >1, then residence time increases, but productivity decreases

Engineering Contradiction:

Improveresidence timeVSAvoidproductivity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent inverts the conventional vertical cylindrical reactor design by using a horizontal reactor configuration with the catalyst bed arranged horizontally. This inversion allows the gas flow to pass through the catalyst bed in a direction perpendicular to the catalyst bed's main dimension, achieving short residence time while maintaining effective catalytic contact, thus resolving the contradiction between residence time and productivity.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If fluidized catalyst beds are used to reduce residence time, then productivity increases, but thermal equilibrium limitations persist

Engineering Contradiction:

ImproveproductivityVSAvoidenergy efficiency

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent replaces the heat-driven thermocatalytic system with a light-driven photocatalytic system. By using photon illumination to activate the catalyst and drive reactions, the system achieves high productivity with short residence times while overcoming the fundamental thermal equilibrium limitations that constrain conventional fluidized bed reactors.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The photoreactor design achieves higher reaction rates and reduced energy costs by surpassing thermodynamic equilibrium, enabling sustainable production of chemicals like ammonia and ethylene with improved selectivity and stability.

Implementation Method 1

Photocatalysis using optically-active metal catalysts under photon illumination in the ultraviolet-to-visible-light spectrum has shown improved energy efficiency over conventional thermocatalysis

Methodology Applied

Scientific EffectPhotocatalysis: Photosynthesis

Implementation Method 2

By combining photon-induced electronic and thermal effects, photocatalysis promotes reaction rates beyond those of purely thermal catalysis

Methodology Applied

Scientific EffectPhoton-induced electronic and thermal effects: Photoelectric Effect

Implementation Method 3

Coupling light to the reaction pathway provides a non-thermal (electronic) energy transfer that accelerates dissociation and desorption events through inducing vibronic and electronic excitations to the surface adsorbates

Methodology Applied

Scientific EffectVibronic and electronic excitations: Photodissociation

Data Source

PatentUS20250281892A1Photoreactor Design for Chemical Reactions with Limited Thermodynamics

Publication Date: 2025.09.11 SYZYGY PLASMONICS INC

AI summary

Disclosed herein is a photoreactor design having an optically accessible reactor chamber with a short gas flow residence time for carrying out gas-phase catalytic reactions under light illumination. A vertically arranged reactor is provided with a lighting source, a horizontally arranged thin catalyst bed layer supported on a gas-permeable bounding plate through which gas is passed in the vertical direction, and in which incident photons from the light source are perpendicular to the horizontally arranged thin catalyst bed layer. The described technology is intended to enable a number of industrially relevant chemical reactions to proceed under light illumination on the surface of metal photocatalysts with efficiencies and selectivity beyond that dictated by thermodynamic equilibrium in conventional thermal catalysis in the heat-powered plants.