Enhanced Higher Alcohol Synthesis from CO Hydrogenation on Zn-Modified MgAl-Mixed Oxide Supported KNiMoS-Based Catalysts

Abstract

A highly dispersed KNiMo catalyst on Zn-modified MgAl-mixed oxide as a support is prepared by a surfactantassistance hydrothermal method. The introduction of Zn can decrease the concentration of strong acidic sites and also can weaken the metal−support interaction to modulate the reducibility, sulfidation degree, lengths/stacking degree, and dispersion of MoS 2 slabs. The K,NiMoS/Zn 0.35 Mg 0.35 Al 0.3 exhibits appropriate acidity, high reducibility, and a sulfidation degree with dominant double-layer MoS 2 (∼43%) and high synergism between NiS x and K-Ni-Mo-S phase, and as a result, higher total alcohol selectivity (56.5%) and C 2+ alcohol selectivity (82.2%) can be achieved in higher alcohol synthesis (HAS). This work proposes an effective route to simultaneously modulate the acidity of the catalyst and metal−support interaction and to obtain more exposure of active sites on the integration of Zn-modified MgAl-mixed oxides as supports and a surfactant-assistance strategy for the enhancement of C 2+ OH selectivity in HAS.

In Situ Encapsulated CuCo@M-SiO2 for Higher Alcohol Synthesis from Biomass-Derived Syngas

“…However, it is an enormous challenge to achieve a trade-off between the C–C coupling and the C–O retaining. Typically, four categories of catalysts including Rh-based, − Mo-based, − modified methanol-synthesized catalysts, − and modified Fischer–Tropsch (F–T)-synthesized catalysts have long been investigated for HAS. − Although Rh-based catalysts have high C 2+ OH selectivity with Rh 0 -/Rh n + -active centers, the industrialization was unrealistic because of limited reserves and exorbitant price. Harsh reaction conditions and strict H/C ratio with Mo-based catalysts is not conducive to the practical application in HAS.…”

Influence of Carbon Content in Ni-Doped Mo2C Catalysts on CO Hydrogenation to Mixed Alcohol

“…Four kinds of catalysts are commonly used in CO hydrogenation to mixed alcohol: Rh-based catalysts [7][8][9][10], Mo-based catalysts [11][12][13][14], modified Fischer-Tropsch synthesis catalysts [15][16][17][18] and modified methanol synthesis catalysts [19,20]. Molybdenum carbide catalysts are widely used in CO or CO 2 hydrogenation to mixed alcohol [21][22][23], water gas shift [24,25], methanol steam reforming [26][27][28], methane dry reforming [29] and so on.…”