Themed collection Carbon dioxide utilisation

The 12 principles of CO₂ chemistry published 2015 are brought into context with the current perspective. “What has been changed since then?” and “is our enthusiasm still enough?” are just a few questions that are to be answered in the following.

This overview on carbon dioxide utilization (CDU) provides a framework for the opportunities, boundary conditions, potential pitfalls, and critical needs to advance technologies rapidly to deploy CDU as a mainstream climate-relevant solution.

A circular economy in the built environment via carbon mineralization of alkaline industrial wastes and silicate minerals via P_CO2 swing or via pH swing, employing acid and base generated from electrolysis using renewable energy.

We propose a new screening-type social impact assessment for developing CDU technologies; the method can be used as a standalone assessment or integrated with TEA and LCA to create a holistic sustainability study to enhance effective decision making.

We incorporate the carbonation of ultramafic ore followed by froth-flotation to enhance nickel recovery in the beneficiation stage, instead of the traditional froth-flotation step for nickel processing.

By looping magnesium via electrolysis, capture and conversion of CO₂ to higher-value products can happen simultaneously. The effect of other gases on this process, particularly oxygen, in waste CO₂ streams is investigated and shown not to cause adverse effects.

PdZn/TiO₂ combined with ZSM-5 zeolites allowed for consecutive CO₂ hydrogenation to CH₃OH, CH₃OH dehydration to DME, and MTH/DMTH in a one-pass single bed reactor. PdZn alloys, although stable at high temperature, hydrogenate olefins, limiting MTH/DMTH chain growth.

We examine natural and managed pathways for CO₂ mineralisation. Our study indicates that managed pathways have potential to meet 60% of the UK’s CCUS-led emission reductions by mineralising 24 Mt CO₂ in selected industrial wastes by 2030.

CO₂-negative concrete is possible via bioenergy and CCS at cement kilns and recarbonation of concrete during and after service life. However, CO₂ uptake by biomass and concrete is gradual and CO₂ negativity is reached only well after emissions occur.

A first principles density functional study into the bulk and surfaces properties of MAX-phase early transition metal silicon carbides points to their potential as carbon dioxide hydrogenation catalysts.

In this work, we report the use of hydrophobic 1-octadecanethiol coatings at copper coated gas diffusion electrodes to enhance the production of ethylene.

Continuous operational mode increased systems efficiency compared to fed-batch mode. Hydraulic retention time (HRT) affected the production pattern. Short and long HRT increased acetate production rate and products diversity, respectively.

To investigate the kinetics of methanol synthesis from a mixture of CO₂/CO/H₂, a computational fluid dynamics model has been developed, incorporating two distinct kinetic models, one which includes CO hydrogenation and one which does not.

In this study, we explore synergetic effects between biomass and CO₂ utilization to reduce both GHG emissions and renewable resource use.

We report the application of gas diffusion electrodes and catalyst deactivation processes in aprotic CO₂ reduction flow cells.

A partially oxidised Fe–Ni–S catalyst efficiently converts carbon dioxide and hydrogen into formate species under liquid phase alkaline conditions.

Moderate to high pressures of carbon dioxide, relevant to an integrated capture and utilisation system, achieve greatly increased current densities for CO production.

Evaluating the effect of synthesis technique and metal oxide support material on the catalytic performance of Mo₂C in the CO₂ assisted oxidative dehydrogenation of C₂H₆.