# Advancing Sustainability in Hydrocarbon Production: Breakthroughs in CO2 Hydrogenation with Iron-Based Catalysts and Comprehensive Life Cycle Assessment of Environmental Impacts

## TL;DR

This study explores how iron-based catalysts and life cycle assessments can help make CO2 hydrogenation more sustainable for producing carbon-neutral fuels.

## Contribution

The study introduces a detailed life cycle assessment of iron and cobalt-based catalysts for CO2 hydrogenation under laboratory conditions.

## Key findings

- The Co45 catalyst achieved a CO2 utilization factor of 167% at 350°C, showing net CO2 consumption.
- Iron-based catalysts have lower emissions but less CO2 conversion efficiency compared to cobalt-based ones.
- Replacing fossil electricity with renewable sources improves CO2 sequestration but raises land-use and ecotoxicity concerns.

## Abstract

The need for carbon-neutral synthetic fuels drives research
into
CO2 hydrogenation via Fischer–Tropsch (FT) synthesis,
where catalyst selection affects conversion efficiency and environmental
performance. This study applies life cycle assessment to three hydrotalcite-derived
catalysts (Fe30, Fe40, Co45), evaluating CO2 utilization
efficiency, energy demand, and environmental impacts under laboratory-scale
FT conditions. The CO2 utilization factor (CUF), defined
as the ratio of CO2 consumed to emitted, reached 167% for
Co45 at 350 °C, indicating net CO2 consumption despite
burdens from cobalt production and critical raw material use. Iron-based
catalysts offer lower production-related emissions but lower CO2 conversion, with Fe40 performing least favorably. Scenario
analysis highlights electricity supply effects: replacing fossil power
with hydro or biomass electricity improves CO2 sequestration
but introduces land-use and ecotoxicity challenges. These findings
expose limitations of extrapolating laboratory-scale LCA to industrial
systems and support the development of carbon-negative FT fuels by
guiding catalyst design, process efficiency, and energy integration.