Biomass Gasification Catalyst for CO2 Neutral Hydrogen Production
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Solution Overview
Problem
Current methods for hydrogen production from hydrocarbon fuels, such as steam methane reforming, result in significant CO2 emissions, which may be limited by regulations and carbon taxes, and lack a simple and efficient approach to produce hydrogen without increasing CO2 levels.
Innovation Solution
A method involving the adsorption of biomass onto a catalyst, followed by gasification to produce hydrogen and regenerate the catalyst, using a catalyst like nickel or supported nickel, under ambient conditions, which reduces energy costs and CO2 emissions, and includes a water gas shift reaction to enhance hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam methane reforming is used for hydrogen production, then hydrogen generation is achieved, but significant CO2 emissions occur which may be limited by regulations and carbon taxes
Solution Approach 1:
The patent changes the chemical reaction parameters by using biomass gasification instead of steam methane reforming, altering the feedstock from fossil-based methane to biomass-derived syngas, thereby producing hydrogen with a neutral carbon footprint
Solution Approach 2:
The patent converts the harmful CO2 emissions problem into a benefit by using biomass as feedstock, where the carbon dioxide released during gasification is offset by the carbon absorbed during biomass growth, creating a carbon-neutral hydrogen production process
2Productivity
If biomass is gasified without adsorption onto catalyst first, then gasification can proceed, but fouling occurs in the reactor and equipment downtime increases
Solution Approach 1:
The patent applies preliminary action by adsorbing biomass onto the catalyst surface before gasification occurs. This pre-adsorption step concentrates the biomass on the catalyst, enabling complete combustion and preventing fouling in downstream equipment
Solution Approach 2:
The catalyst acts as an intermediary between the biomass feedstock and the gasification process. By mediating the interaction through adsorption, the catalyst enables controlled combustion that prevents direct fouling of reactor surfaces and downstream equipment
3Productivity
If higher temperatures are used for gasification reactions, then reaction rate increases, but energy costs and CO2 emissions increase
Solution Approach 1:
The patent applies self-service by using the heat generated from the exothermic combustion of adsorbed biomass to sustain the gasification reaction. The system is self-heating, eliminating or reducing the need for external energy input while maintaining high reaction rates
4Device complexity
If biomass is not adsorbed onto catalyst beforehand, then process steps are simpler, but biomass causes fouling elsewhere in the reactor and requires more purification
Solution Approach 1:
The patent extracts the biomass from the general reactor environment and concentrates it on the catalyst surface through adsorption. This extraction prevents the biomass from causing fouling in other parts of the reactor while enabling complete combustion on the catalyst surface
Solution Approach 2:
The patent converts the potentially harmful fouling effect of biomass into a benefit by directing it to combust completely on the catalyst surface. The biomass that would otherwise cause fouling is instead used as a fuel source, generating heat and producing a cleaner gas stream
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 efficiently produces hydrogen with reduced CO2 emissions, lowers equipment downtime, and minimizes the need for downstream purification, while using lower temperatures to improve process economy and maintain catalyst effectiveness.
Implementation Method 1
A biomass starting material, for example a pyrolysis oil, can be introduced and adsorbed onto a gasification catalyst, for example nickel, supported nickel, or other metal. Adsorption occurs under ambient conditions without additional heating
Implementation Method 2
heating said sorbed hydrocarbon fuel to a first temperature for a first period of time sufficient to form coke
Implementation Method 3
gasifying said coke at a second temperature for a second period of time in the presence of water and/or oxygen, so as to produce a gasesous mixture comprising hydrogen gas and carbon monoxide
Implementation Method 4
Gasification, for example steam gasification, both regenerates the catalyst and produces bio-syngas
Implementation Method 5
The bio-syngas can further undergo a water gas shift (WGS) reaction, yielding hydrogen and so-called 'bio-CO2'
Data Source
AI summary
There is provided herein a method for producing hydrogen gas, comprising: sorbing a liquid hydrocarbon fuel to a gasification catalyst to form a sorbed hydrocarbon fuel; heating said sorbed hydrocarbon fuel to a first temperature for a first period of time sufficient to form coke; and gasifying said coke at a second temperature at a pressure for a second period of time in the presence of water and/or oxygen, so as to produce hydrogen gas and carbon monoxide and to regenerate said catalyst. In particular, the hydrocarbon fuel can be a liquid biomass, such pyrolysis oil, and the method can be CO2 neutral.