Zeolite Catalyst Structure for Synthesis Gas Production
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Solution Overview
Problem
Existing catalyst structures for synthesis gas production face challenges such as coking and oxidation of iron-group element catalysts, leading to decreased catalytic activity over time.
Innovation Solution
A catalyst structure featuring a zeolite-type carrier with channels, first catalyst particles containing an iron-group element, and second catalysts with transition metal elements having Redox capacity, which suppresses coking and oxidation, maintaining high catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fine particles containing iron-group elements such as nickel are used as catalyst material to achieve high catalytic activity, then catalytic activity is improved, but coking occurs on the catalyst surface leading to decreased catalytic activity over time
Solution Approach 1:
A carrier comprising a zeolite-type compound with channels communicating with one another is introduced as an intermediary structure. The fine particles containing iron-group elements are placed inside these channels, which protects them from direct contact with the reaction environment while maintaining catalytic activity. This mediator structure prevents coking on the catalyst surface by controlling the reaction environment within the channels.
Solution Approach 2:
The invention utilizes a carrier with a porous structure comprising a zeolite-type compound having channels communicating with one another. This porous structure provides a controlled environment for the catalyst particles, allowing reactants to access the catalyst while protecting it from deactivation. The specific pore structure prevents carbon deposition that would otherwise occur on exposed catalyst surfaces.
2Reliability
If catalyst particles containing iron-group elements are placed inside the carrier channels to suppress coking, then catalytic activity is maintained for longer, but oxidation of catalyst particles by water molecules occurs
Solution Approach 1:
A coating layer comprising a platinum-group element is applied to the surface of the carrier channels as a protective intermediary. This coating layer acts as a barrier that prevents water molecules produced in the reverse shift reaction from reaching and oxidizing the iron-group element catalyst particles inside the channels, while still allowing necessary mass transport.
Solution Approach 2:
The invention creates a composite catalyst structure combining multiple materials: a zeolite-type carrier, iron-group element catalyst particles inside the channels, and a platinum-group element coating on the channel surfaces. This composite structure integrates the benefits of each material - the zeolite provides structural support and channel formation, the iron-group elements provide catalytic activity, and the platinum-group coating provides oxidation protection.
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 catalyst structure effectively maintains high catalytic activity for a long period, enhancing the efficiency of synthesis gas production while reducing the frequency of catalyst replacement.
Implementation Method 1
second catalysts containing a transition metal element with Redox capacity... oxidation of the first catalyst particles present inside the carrier can be suppressed by the second catalysts containing a transition metal element with Redox capacity
Implementation Method 2
coking on the surfaces of the first catalyst particles can be suppressed... the first catalyst particles being present at least in the channels of the carrier, and second catalysts containing a transition metal element with Redox capacity are present at least either inside or on the outer surface of the carrier
Data Source
AI summary
A catalyst structure for synthesis gas production is used to produce a synthesis gas that includes carbon monoxide and hydrogen. The structure includes a carrier with a porous structure that comprises a zeolite-type compound; first catalyst particles that contain at least one iron-group element selected from the group consisting of nickel, iron, and cobalt; and a second catalyst that contains at least one transition metal element with redox capacity. The carrier includes, inside thereof, mutually communicating passages; the first catalyst particles are present at least in the passages of the carrier; and the second catalyst is present at least in the interior or on an outer surface of the carrier.