Metathesis of ethylene and butylene-2 to propylene with Mo on Hβ-Al2O3 catalysts

Liu, Shenglin; Huang, Sheng-Jun; Xin, Wenjie; Bai, Jie; Xie, Sujuan; Xu, Longya

doi:10.1016/j.cattod.2004.06.062

Cited by 36 publications

(20 citation statements)

References 8 publications

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“…The acidity effects on the two main processes were studied in detail respectively. Many reports about olefin metathesis focused on the Mo VI and Mo IV centers [27][28][29][30], but our experiments confirmed that the Mo V one may be the active sites for the olefin metathesis reactions, and the deep reduction to the Mo IV species would lead to deactivation [3,31]. So only the processes over Mo V species are considered in this study.…”

Section: Resultssupporting

confidence: 85%

“…Recently our laboratory found that the Mo catalyst supported on the HBeta and Al 2 O 3 composite carrier has good performance for the cross-metathesis of ethylene and 2-butylene to propylene [3,4]. Many reports [5][6][7] have demonstrated that the Brönsted acidity of the supports would be advantageous for the heterogeneous catalysts in olefin metathesis, e.g.…”

Section: Introductionmentioning

confidence: 98%

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The Effect of Support Acidity on Olefin Metathesis over Heterogeneous Mo/HBeta Catalyst: A DFT Study

Zheng

Guan

et al. 2010

Catal Lett

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The effect of support acidity on the crossmetathesis of ethylene and 2-butylene to propylene over heterogeneous Mo/HBeta catalyst was studied by density functional theory (DFT) calculations. The zeolite acidity was mimicked by changing the terminating Si-H bond lengths. Both of the initiating formation and propagating processes of Mo-carbene were investigated. It is found that there is a correlation between the zeolite acidity and the activation barrier. The influence of acidity on the initial Mo-carbene formation process is greater than that on the next process catalyzed by this active site. Theoretical calculations reveal that the heterogeneous catalyst with more acidic support could have better olefin metathesis activities, which is consistent with the experimental findings in the literature.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 98%

The Effect of Support Acidity on Olefin Metathesis over Heterogeneous Mo/HBeta Catalyst: A DFT Study

Zheng

Guan

et al. 2010

Catal Lett

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“…Recently, our laboratory reported that Mo supported on HBeta-Al 2 O 3 composites exhibited high activity in the metathesis of ethene and butene-2 to propene at ca. 393 K, which offers an alternative pathway for the production of propene [16]. In contrast, Mo supported on HBeta zeolites performed poorly due to the strong interaction between Mo species and HBeta zeolites [17].…”

Section: Introductionmentioning

confidence: 90%

“…Heterogeneous catalysts for metathesis reactions are of further interest due to their ease of separation, good persistence, and recyclability [4,5]. A number of solid catalysts have been reported for the olefin metathesis, the most feasible of which are those based on Re, W, and Mo [6][7][8][9][10][11][12][13][14][15][16]. Of these, supported Re 2 O 7 /Al 2 O 3 is highly active and selective even at room temperature, and its catalytic performance can be improved by using composite supports, such as Al 2 O 3 -SiO 2 [9], Al 2 O 3 -B 2 O 3 [10,11], and Al 2 O 3 -P 2 O 5 [12].…”

Section: Introductionmentioning

confidence: 99%

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

Zhang

Liu

et al. 2007

Journal of Catalysis

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“…126 Recently, we reported that Mo/HBetaAl 2 O 3 was a highly active catalyst for metathesis of ethene and 2-butene to propene. [127][128][129] This provides a promising alternative way for the production of propene, which is in high demand in the world-wide chemical industry. In contrast, Mo supported on HBeta zeolites performed poorly due to the strong interaction between Mo species and HBeta zeolites.…”

Section: -125mentioning

confidence: 99%

In situsolid-state NMR for heterogeneous catalysis: a joint experimental and theoretical approach

et al. 2012

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In situ solid-state NMR is a well-established tool for investigations of the structures of the adsorbed reactants, intermediates and products on the surface of solid catalysts. The techniques allow identifications of both the active sites such as acidic sites and reaction processes after introduction of adsorbates and reactants inside an NMR rotor under magic angle spinning (MAS). The in situ solid-state NMR studies of the reactions can be achieved in two ways, i.e. under batch-like or continuous-flow conditions. The former technique is low cost and accessible to the commercial instrument while the latter one is close to the real catalytic reactions on the solids. This critical review describes the research progress on the in situ solid-state NMR techniques and the applications in heterogeneous catalysis under batch-like and continuous-flow conditions in recent years. Some typical probe molecules are summarized here to detect the Brønsted and Lewis acidic sites by MAS NMR. The catalytic reactions discussed in this review include methane aromatization, olefin selective oxidation and olefin metathesis on the metal oxide-containing zeolites. With combining the in situ MAS NMR spectroscopy and the density functional theoretical (DFT) calculations, the intermediates on the catalyst can be identified, and the reaction mechanism is revealed. Reaction kinetic analysis in the nanospace instead of in the bulk state can also be performed by employing laser-enhanced MAS NMR techniques in the in situ flow mode (163 references).

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Metathesis of ethylene and butylene-2 to propylene with Mo on Hβ-Al2O3 catalysts

Cited by 36 publications

References 8 publications

The Effect of Support Acidity on Olefin Metathesis over Heterogeneous Mo/HBeta Catalyst: A DFT Study

The Effect of Support Acidity on Olefin Metathesis over Heterogeneous Mo/HBeta Catalyst: A DFT Study

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

In situsolid-state NMR for heterogeneous catalysis: a joint experimental and theoretical approach

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