This work is part of RECYCLE, a UK government funded project (Department of Energy Security and Net Zero) to produce low carbon H2 for industrial processes. The key objective of RECYCLE is to demonstrate an enhanced auto-thermal reforming process for cost-effective production of hydrogen with a CO2 capture rate of 99%. RECYCLE relies on a high-pressure chemical looping process. The OC undergoes air oxidation, reduction and CH4 reforming stages. This produces low-cost and low-carbon hydrogen using both natural gas and bio-based feedstock. Various oxygen carrier (OC) mixtures and compositions were studied to determine optimal operating conditions and improve the cost-effectiveness of the RECYCLE CLR system. Although Ni-based oxygen carriers are ideal for this application in terms of reforming kinetics and oxygen capacity, they come with higher environmental and economic costs than Fe-based OCs. Hence, this work explored the use of various loadings and combinations of Ni and Fe OCs in a 10g packed bed reactor, a lab-scale equivalent to the RECYCLE demonstrator plant. The materials tested were found to be suitable OCs with very little change in oxygen transfer capacity over repeated cycles. However, Fe alone did not work as a CH4 reforming catalyst and required the addition of a small amount of Ni to catalyse the reaction. This shows that combining Ni and Fe can reduce costs and lower the carcinogenic dangers of chemical looping reforming oxygen carriers while maintaining catalytic activity and delivering sufficient oxygen carrier capacity.