Impact of Boron Modification on MCM-41-Supported Cobalt Catalysts for Hydrogenation of Carbon Monoxide

Tupabut, Pimchanok; Jongsomjit, Bunjerd; Praserthdam, Piyasan

doi:10.1007/s10562-007-9160-3

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…The primary objective has been maximizing waxy hydrocarbons and improving catalyst stability through understanding support structure effects [1][2][3][4][5], the role of promoters-such as noble metals (Pt, Ru, Pd, Re, Rh) [6][7][8][9][10][11][12][13][14][15][16][17], Group 11 metals (Cu, Ag, and Au) [18], alkali promoters (Li, Na, K, Cs) [19,20], and rare earth (La, Ce, Th) [21,22] as well as other oxides (Zr, Mo, B, and Mn) [21][22][23][24][25], and Co particle size effects [25][26][27][28][29]. The strong interaction between Co and the Al 2 O 3 support results in a better Co dispersion than moderate and weak interactions between Co and TiO 2 , and Co and SiO 2 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch Synthesis: Influence of CO Conversion on Selectivities, H2/CO Usage Ratios, and Catalyst Stability for a Ru Promoted Co/Al2O3 Catalyst Using a Slurry Phase Reactor

Jacobs

et al. 2011

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The effect of CO conversion on hydrocarbon selectivities (i.e., CH 4 , C 5? , olefin and paraffin), H 2 /CO usage ratios, CO 2 selectivity, and catalyst stability over a wide range of CO conversion (12-94%) on 0.27%Ru-25%Co/Al 2 O 3 catalyst was studied under the conditions of 220°C, 1.5 MPa, H 2 /CO feed ratio of 2.1 and gas space velocities of 0.3-15 NL/g-cat/h in a 1-L continuously stirred tank reactor (CSTR). Catalyst samples were withdrawn from the CSTR at different CO conversion levels, and Co phases (Co, CoO) in the slurry samples were characterized by XANES, and in the case of the fresh catalysts, EXAFS as well. Ru was responsible for increasing the extent of Co reduction, thus boosting the active site density. At 1%Ru loading, EXAFS indicates that coordination of Ru at the atomic level was virtually solely with Co. It was found that the selectivities to CH 4 , C 5? , and CO 2 on the Co catalyst are functions of CO conversion. At high CO conversions, i.e. above 80%, CH 4 selectivity experienced a change in the trend, and began to increase, and CO 2 selectivity experienced a rapid increase. H 2 /CO usage ratio and olefin content were found to decrease with increasing CO conversion in the range of 12-94%. The observed results are consistent with water reoxidation of Co during FTS at high conversion. XANES spectroscopy of used catalyst samples displayed spectra consistent with the presence of more CoO at higher CO conversion levels.

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Section: Introductionmentioning

confidence: 99%

Fischer–Tropsch Synthesis: Influence of CO Conversion on Selectivities, H2/CO Usage Ratios, and Catalyst Stability for a Ru Promoted Co/Al2O3 Catalyst Using a Slurry Phase Reactor

Jacobs

et al. 2011

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“…N2 physisorption and reaction study. [17,[19][20][21]. The observed short-broaden peaks suggested the good dispersion of Co3O4 and CoAl2O4 species.…”

Section: Resultsmentioning

confidence: 86%

“…The reduction peak for the CoCL sample was located at ca. 450 o C. All the peaks observed were assigned to the overlap of two step reduction of Co3O4 to CoO and, then to Co metal [17,[19][20][21]. Upon the TPR conditions, the two-step reduction may or may not be observed.…”

Section: Resultsmentioning

confidence: 95%

Effect of Cobalt Precursors on Properties of Co/CoAl2O4 Catalysts Synthesized by Solvothermal Method

Rojanapipatkul¹,

Goodwin²,

Praserthdam³

et al. 2012

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Abstract. In the present study, different cobalt precursors, such as cobalt acetylacetonate (CoAA), cobalt acetate (CoAC), cobalt nitrate (CoN) and cobalt chloride (CoCL), were employed to synthesize the cobalt on cobalt-aluminate catalysts by the solvothermal process. The calcined samples were characterized by means of N2 physisorption, XRD, SEM/EDX, TEM and TPR. The CO hydrogenation under methanation condition was performed to measure the activity and product distribution. It revealed that the CoN sample exhibited the highest activity due to high reducibility and large crystallite size having fewer interactions. The similar trend was observed for the CoAC and CoAA samples. However, the CoCL sample had the lowest activity, but highest selectivity to C2-C4 products. This was likely attributed to the different form of cobalt oxide species obtained from CoCl2 as seen from XRD.

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“…In addition, the strong XRD peak at 29°(overlap with the XRD peak for the monoclinic phase of ZrO 2 ) was detected for the zirconia supports with B modification also assigning to the B 2 O 3 species [24]. Figure 3 shows the XRD patterns of different zirconia-supported cobalt catalysts consisting of In order to study the morphologies and elemental distribution of the catalyst samples, SEM and EDX were performed, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Study on Characteristics and Catalytic Properties of Co/ZrO2-B Catalysts Towards Methanation

2008

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Impact of Boron Modification on MCM-41-Supported Cobalt Catalysts for Hydrogenation of Carbon Monoxide

Cited by 8 publications

References 27 publications

Fischer–Tropsch Synthesis: Influence of CO Conversion on Selectivities, H2/CO Usage Ratios, and Catalyst Stability for a Ru Promoted Co/Al2O3 Catalyst Using a Slurry Phase Reactor

Fischer–Tropsch Synthesis: Influence of CO Conversion on Selectivities, H2/CO Usage Ratios, and Catalyst Stability for a Ru Promoted Co/Al2O3 Catalyst Using a Slurry Phase Reactor

Effect of Cobalt Precursors on Properties of Co/CoAl2O4 Catalysts Synthesized by Solvothermal Method

A Study on Characteristics and Catalytic Properties of Co/ZrO2-B Catalysts Towards Methanation

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