Catalytic Activity of NiMo Sulfide Supported on a Particular Carbon Black of Hollow Microsphere in the Liquefaction of a Subbituminous Coal

Abstract

The liquefaction of Wyoming coal (subbituminous coal) was investigated with an autoclave of 50 mL capacity, using Ketjen Black (KB)-supported NiMo catalyst, which has higher hydrogenation activity of 1-methylnaphtalene than a commercial NiMo/Al2O3. KB-supported NiMo catalyst gave the oil and oil plus asphaltene yield of 54 and 69% under reaction conditions of 440 °C, 60 min, and 13 MPa. These yields were much higher than those of a commercial NiMo/Al2O3 and synthesized FeS2 catalysts. The KB-supported NiMo catalyst was found to be recovered from the solid products using polar solvents such as THF because it is highly dispersed in liquid products due to its low specific gravity and the hydrophobic property of its surface. It was also found that KB-supported NiMo catalyst suffered the least deactivation by coke formation and mineral matter deposition because the recovered catalyst as THFI residue appeared to regenerate the activity to a level similar to the fresh catalyst.

Hydrodesulfurization of Thiophene on Activated Carbon Fiber Supported NiMo Catalysts

“…Consequently, the frequency for regeneration is likely to be less in the former material. Also, a chemical method using organic solvents such as tetrahydrofuran can be successfully used to regenerate and remove the deposited coke from the carbon-supported NiMo catalysts . The regeneration study is extensive and will be addressed in a future study.…”

“…Also, a chemical method using organic solvents such as tetrahydrofuran can be successfully used to regenerate and remove the deposited coke from the carbon-supported NiMo catalysts. 57 The regeneration study is extensive and will be addressed in a future study. The mechanical strength of ACF depends on various aspects including its precursor, weaving technique, and carbonization and activation conditions to prepare the material from its pristine nonactivated form.…”

Clean liquid fuels from direct coal liquefaction: chemistry, catalysis, technological status and challenges

“…83,209 The high conversion and oil yields of nanoparticulate carbon supported Ni-Mo, Fe-Mo, and Fe-Mo-Ni catalysts with extreme high surface area and low density were reported by several researchers. [304][305][306] The high activity is due to the hollow structure of spherical carbon particles (Ketjen Black, KB). Its hollow spheres of low gravity suggest the possibility of gravimetric recovery.…”

Application of Core/Shell Nanoparticles in Smart Farming: A Paradigm Shift for Making the Agriculture Sector More Sustainable

“…Though CSNs are mostly used as controlled release platforms, , they are also used as adsorbents, lightweight structures, , catalytic supporters, , microvessels, and insulators . CSNs play a crucial role in controlled drug release in specific sites, , cell labeling, tissue engineering, and bioimaging. − Now, the researchers are investigating their potential applications in the field of agriculture.…”