Effect of cobalt promoter on Co–Mo–K/C catalysts used for mixed alcohol synthesis

Li, Zhongrui; Fu, Yu; Bao, Jun; Jiang, Ming; Hu, Tian-Duo; Liu, Tao; Xie, Yao

doi:10.1016/s0926-860x(01)00646-9

Cited by 98 publications

(40 citation statements)

References 26 publications

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“…Only very weak broad peaks were detected on the sample. For comparison purpose, the XRD pattern of supported K-Co-Mo/C sulfided catalysts (prepared by impregnation technique, see [17]) was also listed. The supported sample showed a similar diffraction pattern to the three present catalysts and its diffraction intensities was almost the same as that of the SKCM01, which indicated that after sulfidation, the sol-gel derived sample still kept a small size.…”

Section: Xrd and Bet Resultsmentioning

confidence: 99%

“…No clear indication of Mo-Co coordination (R Mo-Co = 0.28 nm) were observed in Mo K-edge EXAFS spectra. This might be due to the fact that for the catalysts the MoCo coordination number was low and overlapped by the strong Mo-Mo coordination shell since the near coordination distance [17].…”

Section: Exafs Resultsmentioning

confidence: 99%

“…Table 4 lists the catalytic performance of SKCM01 and those of some similar catalysts in previous reports [12,17,22]. Comparison with the unsupported K-Co-Mo catalysts in patents, the SKCM01 exhibited better activity for alcohol synthesis except that the C 1 OH/C 2+ OH ratio was a little high.…”

Section: Catalytic Activitymentioning

confidence: 86%

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Sol–gel Preparation of K–Co–Mo Catalyst and its Application in Mixed Alcohol Synthesis from CO Hydrogenation

Bao

Bian

2007

Catal Lett

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A kind of K-Co-Mo catalyst with large surface area, small particle size and homogenous components distribution was prepared by sol-gel method using citric acid as complexant, and characterized by XRD, BET, HR-TEM, EXAFS and TPD techniques. The activity for mixed alcohol synthesis from syngas on the catalysts was investigated. During the preparation, a gelation process was adopted to prevent the components from precipitating during the solvent extraction and keep the homogeneity and small particle size of final products. Heat-treated the dried gel in argon, the decomposition of critic acid partly reduced the sample and decreases the particle sizes remarkably. The synthesized K-Co-Mo catalyst exhibited excellent performance for mixed alcohol synthesis from CO hydrogenation, which may be due to its large surface area and small particle size creating more active sites. Beside it, the homogeneity of various components was also helpful to enhance the synergistic effect of Co promoters. The high selectivity to the C 2+ OH was due to the large amount of SH species adsorbed on the catalyst surface.

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Section: Xrd and Bet Resultsmentioning

confidence: 99%

Section: Exafs Resultsmentioning

confidence: 99%

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Sol–gel Preparation of K–Co–Mo Catalyst and its Application in Mixed Alcohol Synthesis from CO Hydrogenation

Bao

Bian

2007

Catal Lett

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“…It was found that addition of 3d transition metal components (e.g., cobalt and nickel) to reduced or sulfided molybdenum-based catalysts increased the selectivity to C 2? alcohols markedly [8][9][10]. Fujimoto and Oba [11] studied CO hydrogenation over K-Co-Mo/A1 2 O 3 and K-Co-Mo/SiO 2 catalysts and found that all the three elements are necessary for higher activity of the catalysts.…”

Section: Introductionmentioning

confidence: 99%

DRIFT Studies of Adsorbed CO Over Sulfided K–Rh–Mo/Al2O3 Catalysts: Detection of Rh–Mo–S Phase

Eswaramoorthi

Dalai

2009

Catal Lett

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Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was used to study the nature of active species in K-Rh-Co-MoS 2 /Al 2 O 3 catalyst by means of probing with CO molecule. The effects of K addition to Rh and interaction between Mo and Rh were studied with varying K and Mo loadings over 1 wt% Rh/Al 2 O 3 catalyst. In sulfided Rh-Mo/Al 2 O 3 , the formation of Rh-Mo-S phase was evidenced first time by a band at 2,095 cm -1 .

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“…Recent studies revealed that both the activity and selectivity to higher alcohols can be improved by adding effective promoters, such as Fischer-Tropsch components and alkali metals into MoS 2 -based catalysts [1][2][3][4][5], changing the nature of the catalyst supports [6][7][8][9][10][11], and modifying the catalyst preparation method [12,13]. Very recently, other new catalysts were also developed and a good activity and selectivity could also be obtained.…”

Section: Introductionmentioning

confidence: 99%

Effect of Lanthanum Promotion on the Unsupported Mo–Co–K Sulfide Catalysts for Synthesis of Mixed Alcohols from Syngas

et al. 2008

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The unsupported Mo-Co-K sulfide catalysts promoted by La were prepared through ultrasonic technology in non-aqueous medium and its performances for the synthesis of mixed alcohols from syngas were also investigated. The results showed that the catalysts promoted by La exhibited higher CO conversion and selectivity to ethanol than the unsupported Mo-Co-K sulfide catalyst without addition of La did under identical reaction conditions. The catalysts were characterized by N 2 adsorption/ desorption, X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), Raman, and X-ray photoelectron spectroscopy (XPS).

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Effect of cobalt promoter on Co–Mo–K/C catalysts used for mixed alcohol synthesis

Cited by 98 publications

References 26 publications

Sol–gel Preparation of K–Co–Mo Catalyst and its Application in Mixed Alcohol Synthesis from CO Hydrogenation

Sol–gel Preparation of K–Co–Mo Catalyst and its Application in Mixed Alcohol Synthesis from CO Hydrogenation

DRIFT Studies of Adsorbed CO Over Sulfided K–Rh–Mo/Al2O3 Catalysts: Detection of Rh–Mo–S Phase

Effect of Lanthanum Promotion on the Unsupported Mo–Co–K Sulfide Catalysts for Synthesis of Mixed Alcohols from Syngas

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