Catalyst Handbook - 2020 - 372

2020 CATALYST HANDBOOK
INDUSTRY CATEGORIES

PROCESS CATEGORIES

COMPANY INDEX

GAS PROCESSING
Purification

CO2 purification catalysts
Application: Shell Catalysts & Technologies provides stable, high-performance
catalysts to remove trace contaminants from CO₂ streams prior to further use in
chemical, agricultural and food applications. Additionally, these catalyst systems are
outstanding for purifying CO₂ before sequestration.

Advantages: The technology is capable of 98%-99.9% removal of residual
hydrocarbons from the CO₂ stream. The system can also be enhanced to produce
food-grade CO₂ that can be sold commercially for beverage carbonation and in
greenhouses for plant growth.

Description: High-quality CO₂ is a valuable asset in many industries, but in order
for CO₂ producers to repurpose the chemical for other companies, it must first be
scrubbed from simultaneously produced hydrocarbons. Shell Catalysts & Technologies'
CO₂ polishing system offers an effective and refreshing solution for purifying CO₂.
For example, in a plant converting a feed of ethylene into ethylene oxide, an
exhaust stream is also created that contains both hydrocarbons and CO₂. Before
capturing or releasing CO₂ into the atmosphere as permitted by local regulations, the
stream must be scrubbed to effectively remove remaining hydrocarbons.
The process begins by drawing the exhaust stream into the regenerative catalytic
oxidizer (RCO). As the stream enters the RCO, it passes through the first of a series of
heat exchangers that house ceramic heating material.
Lateral flow reactor (LFR) units containing the high-activity catalysts are
mounted on top of each heat exchanger. The system is designed for maximum
thermal efficiency by carefully cycling the flow to each subsequent chamber to
maintain the temperature for optimal catalyst activity. The system offers the potential
for 95% thermal efficiency, resulting in little outside energy being used to maintain the
optimum temperature.
Once the stream has been scrubbed, the CO₂ can be captured and stored for
commercial use or released into the atmosphere as permitted by local regulations.

Supplier: Shell Catalysts & Technologies
Website: https://www.shell.com/business-customers/catalysts-technologies/
catalysts/environmental-catalysts/carbon-dioxide-purification.html
Contact: https://www.shell.com/business-customers/catalysts-technologies/
catalysts/environmental-catalysts/carbon-dioxide-purification.html

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Catalyst Handbook - 2020

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