ChemInform Abstract: KINETIK DER METHANIERUNG VON CO UND CO2 AN EINEM NICKEL‐KATALYSATOR

Herwijnen, T. Van; Doesburg, H. Van; Jong, W.A. De

doi:10.1002/chin.197323142

Cited by 25 publications

(48 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, it is shown that linear correlations of rate of methanol synthesis with Cu metal surface areas are obtained but the slopes of the curves dependent upon the support material [17][18][19][20]. The stability of Cu/ZnO catalysts has been discussed in view of the sintering of Cu via brass formation [21][22][23][24]. It is suggested that the sintering of Cu via brass formation could be prevented in Cu-ZnO-Cr 2 O 3 catalysts obtained from Cu-Zn-Cr hydrotalcite-like precursor [25].…”

Section: Introductionmentioning

confidence: 98%

Cu–Zn–Cr2O3 Catalysts for Dimethyl Ether Synthesis: Structure and Activity Relationship

et al. 2008

View full text Add to dashboard Cite

The CuO dispersed on ZnCr 2 O 4 catalysts derived from Cu-Zn-Cr hydrotalcite like layered double hydroxide precursors with varying Zn/Cr ratios have been synthesized, characterized by BET-Surface area, X-ray diffraction (XRD), temperature programmed reduction (TPR), electron spin resonance (ESR), N 2 O titrations and the activities were evaluated for single step dimethyl ether (STD) synthesis from syngas. It is observed that the copper species were in highly dispersed state over Cu-ZnO-Cr 2 O 3 at high Zn/Cr ratios while the copper cluster were present at low Zn/Cr ratios. The ESR analysis revealed signals due to isolated Cu 2+ at high Zn/Cr ratios and clustered Cu 2+ at low Zn/Cr ratio in fresh catalysts and only Cr 3+ species in used catalysts. The TPR results indicated that the reduction peak shifted to high temperatures with an increase in chromium content due to large copper crystallites, which was supported by XRD analysis. The conversion of syngas to DME was well correlated with the copper metal surface areas, indicating that STD synthesis can be controlled by methanol synthesis rate.

show abstract

Section: Introductionmentioning

confidence: 98%

Cu–Zn–Cr2O3 Catalysts for Dimethyl Ether Synthesis: Structure and Activity Relationship

et al. 2008

View full text Add to dashboard Cite

show abstract

“…However, impurity boron poisons the methanation reaction. film following reduction, heating at 523 K at 1x10- 6 …”

mentioning

confidence: 99%

An infrared study of the hydrogenation of carbon dioxide on supported rhodium catalysts

Henderson¹,

Worley²

1985

J. Phys. Chem.

View full text Add to dashboard Cite

An infrared study of the methanation of C02 on supported Rh catalysts has been performed. This reaction has been shown to occur over these catalysts with higher turnover frequency at a given temperature and Rh loading than does the methanation of CO. A support effect has been demonstrated for the reaction over the supported Rh catalysts (Ti02 > A1203 > Si02 in reactivity). A key surface intermediate during the methanation reaction is a carbonyl hydride species, as evidenced by a prominent infrared band in the 2020-2040-cm"1 11region which shifts by 5-10 cm"1 when D2 is substituted for H2 in the reaction mixture. This carbonyl hydride species can be produced in the absence of H2 by migration of H from the support to Rh. The dissociation of C02 on supported Rh has been shown to be enhanced by the presence of H2 and impurity boron.

show abstract

“…The active sites responsible for ethylene dimerization consist of a low-valent nickel, Ni þ , and an acid site [9,37]. It has been also reported that the catalytic activity of nickel-containing catalysts in ethylene dimerization, as well as in butene isomerization, is closely correlated with the number of acid sites of the catalyst [4,8]. To examine the correlation between catalytic activity and acidity, the initial rates of NiSO 4 /TiO 2 -ZrO 2 containing different NiSO 4 contents are plotted as a function of the number of acid sites in figure 7, where catalysts were evacuated at 500°C for 1.5 h before reaction.…”

Section: Correlation Between Catalytic Activity and Number Of Acid Sitesmentioning

confidence: 99%

“…A considerable number of papers have dealt with the problem of nickel-containing catalysts for ethylene dimerization [1][2][3][4][5][6][7][8][9][10][11][12]. One of the remarkable features of this catalyst system is its activity in relation to a series of n-olefins.…”

Section: Introductionmentioning

confidence: 99%

Correlation between acidic properties of nickel sulfate supported on TiO2-ZrO2 and catalytic activity for ethylene dimerization

2005

View full text Add to dashboard Cite

A series of catalysts, NiSO 4 /TiO 2 -ZrO 2 , for ethylene dimerization was prepared by the impregnation method using an aqueous solution of nickel sulfate. For NiSO 4 /TiO 2 -ZrO 2 sample, no diffraction line of nickel sulfate was observed up to 30 wt%, indicating good dispersion of nickel sulfate on the surface of TiO 2 -ZrO 2 . The addition of nickel sulfate to TiO 2 -ZrO 2 shifted the phase transition of TiZrO 4 from amorphous to orthorhombic to a higher temperature because of the interaction between nickel sulfate and TiO 2 -ZrO 2 . The number of acid sites of NiSO 4 /TiO 2 -ZrO 2 increased in proportion to the nickel sulfate content up to 20 wt% of NiSO 4 . Nickel sulfate supported on TiO 2 -ZrO 2 was found to be very active even at room temperature, giving a maximum in both activity and acidity, when the catalyst containing 20% NiSO 4 was calcined and evacuated at 500°C. The asymmetric stretching frequency of the S @ O bonds for NiSO 4 /TiO 2 -ZrO 2 samples was related to the acidic properties and catalytic activity. That is, the higher the frequency, the higher both the number of acid sites and the catalytic activity for ethylene dimerization.

show abstract

ChemInform Abstract: KINETIK DER METHANIERUNG VON CO UND CO2 AN EINEM NICKEL‐KATALYSATOR

Cited by 25 publications

References 1 publication

Cu–Zn–Cr2O3 Catalysts for Dimethyl Ether Synthesis: Structure and Activity Relationship

Cu–Zn–Cr2O3 Catalysts for Dimethyl Ether Synthesis: Structure and Activity Relationship

An infrared study of the hydrogenation of carbon dioxide on supported rhodium catalysts

Correlation between acidic properties of nickel sulfate supported on TiO2-ZrO2 and catalytic activity for ethylene dimerization

Contact Info

Product

Resources

About