The study demonstrates an impressive hydrocarbon yield (93.12%) using the 14Ni/MOF-Cr2O3 catalyst under optimized conditions. However, the discussion on gaseous by-products, specifically CO and CO2 ratios (Fig. 12b), raises concerns about the long-term stability of the catalyst due to potential coke formation via Boudouard reactions. While the study mentions coke resistance, there is limited quantitative data on the rate of coke deposition and its effect on catalytic activity across multiple cycles.
Could the authors elaborate on how coke formation dynamics were measured beyond TGA analysis, and whether extended-cycle testing (beyond seven runs) was considered to evaluate long-term deactivation trends? Additionally, given the high CO output, have mitigation strategies such as co-feeding with steam to promote water-gas shift reactions been explored to enhance catalyst durability and reduce carbon deposition?