Novel Ni-Co-Mo-K Catalysts Supported on Multiwalled Carbon Nanotubes for Higher Alcohols Synthesis

Table 4

Comparison of the activities of alkali-modified molybdenum-based catalysts promoted with transition metals.

Reference	Li et al., 2001 [28]	Li et al., 2001 [29]	Qi et al., 2003 [30]	Surisetty et al., 2010 [13]	Present work
Catalyst	Mo-K/AC	Co-Mo-K/AC	Ni-Mo-K	Co-Mo-K/MWCNT	Ni-Co-Mo-K /MWCNT
Temperature (°C)	330	330	315	330	330
Pressure (MPa)	5.0	5.0	9.5	8.3	9.0
H2/CO molar ratio	2.0	2.0	2.0	1.0	1.25
GHSV (L/kgcat./h); *(h^−1)	7200	*4800	6000	3600	3800
CO conversion (%)	13	14 (CO2-free)	23	45	49
STY of total alcohols; ^†(g/gcat./h); ^††(g/mLcat./h) (mL/gcat./h)	^†23.1	^††0.199	0.220	0.236	0.284
STY of higher alcohols (g/gcat./h); ^&(CO mol/kgcat/h); ^&&(mL/gcat./h)	^&12. 1	^&&0.114	—	0.171	0.228
STY of hydrocarbon (g/gcat./h); ^¥(% of CO)	^¥38	—	—	0.395	0.375
Total alcohols selectivity; (wt%)	—	47 (CO2-free)	60 (CO2-free)	32	43