Catalytically Active Activated Carbon via Steam Activation
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Solution Overview
Problem
Existing methods for producing catalytically active activated carbon rely on unsustainable carbonaceous feedstocks and involve undesirable processes, such as carbonising/oxidising steps or the use of ammonia, which are environmentally and health-wise hazardous, especially on an industrial scale.
Innovation Solution
A method involving mixing charcoal with organic nitrogen-containing compounds, drying, and steam activation to produce catalytically active activated carbon, eliminating the need for a carbonising/oxidising step and using a sustainable charcoal source, thereby reducing process steps and equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods use unsustainable carbonaceous feedstocks (bituminous coal, subbituminous coal, lignite coal, anthracite coal), then catalytic activity can be achieved, but environmental harm increases due to greenhouse gas emissions
Solution Approach 1:
The invention changes the fundamental parameter of feedstock source from unsustainable fossil-based coals to sustainable biomass-derived charcoal. This parameter change maintains catalytic activity while eliminating the harmful environmental effects associated with depleting fossil resources and high greenhouse gas emissions from conventional feedstocks
Solution Approach 2:
The invention employs charcoal derived from sustainable biomass sources that can be replenished, replacing the depleting fossil fuel feedstocks. This approach uses renewable, short-living biomass materials that sustainably replace long-term unsustainable coal resources
2Reliability
If ammonia is added to steam for activating wood char, then catalytic activity is achieved, but health and environmental hazards increase
Solution Approach 1:
The invention extracts and removes ammonia from the activation process entirely. By using steam alone as the activating agent, the harmful ammonia substance is taken out of the process, eliminating health and environmental hazards while maintaining the ability to produce catalytically active activated carbon
Solution Approach 2:
The invention uses steam as an intermediary activating agent that replaces the harmful ammonia. Steam serves as a safe, effective mediator that achieves the desired activation and catalytic activity without introducing toxic substances into the process
3Reliability
If carbonising and oxidising steps are included in the production process, then catalytic activity is achieved, but process complexity and equipment costs increase
Solution Approach 1:
The invention merges the carbonisation and activation steps into a single integrated process. By using steam activation directly on the charcoal without a separate carbonising step, multiple process functions are combined, reducing equipment requirements and simplifying the overall production process while maintaining catalytic activity
Solution Approach 2:
The invention performs preliminary preparation of charcoal from biomass before activation. The charcoal is pre-formed through controlled pyrolysis, and then directly activated with steam, eliminating the need for subsequent carbonising steps and reducing overall process complexity
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 effectively creates catalytically active activated carbon with a high internal surface area and controlled pore distribution, achieving catalytic activity without the environmental and health risks associated with previous processes, while utilizing a sustainable feedstock.
Implementation Method 1
iii) activating the dried mixture using steam, thereby producing catalytically active activated carbon
Implementation Method 2
mixing charcoal with one or more organic nitrogen-containing compounds
Data Source
AI summary
The invention is directed to a method for preparing catalytically active activated carbon, to catalytically active activate carbon obtainable by the method, and to the use of the catalytically active activated carbon. The method of the invention method comprises the steps of: i) mixing charcoal with one or more organic nitrogen-containing compounds, said nitrogen-containing compounds comprising, next to a first nitrogen atom, at least two or more further heteroatoms selected from the group consisting of nitrogen and oxygen, wherein said further heteroatoms have a lone pair; ii) drying the mixture obtained in step i); iii) activating the dried mixture using steam, thereby producing catalytically active activated carbon.