**7. Conclusions**

Since, the comparative analysis of three different types slurry bed reactors, has been well discussed in the first part of this review while revealing the application of slurry bed reactors for C1 chemistry, along with the four typical exothermic reactions for syngas conversion to different valuable chemicals. Similarly, the comparison between slurry bed, fixed bed, and fluidized bed reactors in second part also emphasized the catalyst deactivation for syngas conversion in slurry bed reactors, including the catalysts sintering, carbon deposition, effects of water on catalyst structure and the catalyst attrition by mixed particle fragmentation. While, the current development trend of slurry bed reactors for C1 chemistry in the last part demonstrates the optimization of the reactor structure, higher active catalysts, and improvement of process conditions that could promote the development of slurry bed reactor. Since, the various techno economic aspects of slurry bed reactor make it very suitable for gas-to-liquid processes, especially for the highly exothermic reactions in C1 chemistry for different valuable chemicals.
