Metathesis of linear α-olefins with MoO3 supported on MCM-41 catalyst

Balcar, Hynek; Topka, Pavel; ilková, N.; Pérez‐Pariente, Joaquín; Čejka, Jiřı́

doi:10.1016/s0167-2991(05)80288-5

Cited by 12 publications

(8 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under stirring, 22.78 mL of 0.1 M TEOS solution was added and the mixture was stirred continuously for 6 h to make the solution homogeneous. The resultant mixture was then aged in an autoclave at 100 8C for 48 h. The crystallized product was filtered, washed with distilled water, dried at ambient temperature for 24 h, and finally calcined at 500 8C for 3 h. The MCM-41 materials were synthesized according to the literature method [9]. All of the metal oxides supported on SBA-15 used in this experiment were prepared via the incipient wetness method.…”

Section: Methodsmentioning

confidence: 99%

“…More importantly, the pore size of ordered mesoporous materials can be tuned within the nanosize range and the pore surface can be functionalized with various organic materials. In previous studies, various metal or metal oxide particles were confined into nano-channels of the mesoporous materials, MCM-41 and SBA-15 [9,10]. Compared to MCM-41, SBA-15 is a more stable matrix for forming occluded nanoparticles, due to its thicker walls and large pore size compared to MCM-41 [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Catalytic combustion of benzene over metal oxides supported on SBA-15

Yang

Jung

Lee

et al. 2008

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of benzene over metal oxides supported on SBA-15

Yang

Jung

Lee

et al. 2008

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

“…800 K is required for dispergation of MoO3 over supports surface. Special attention was given to molybdate species resulted from MoO3 loading on aluminosilicate molecular sieves MCM-22, MCM-56 and 2D-MFI [23] and on siliceous molecular sieves MCM-41, MCM-48 and SBA-15 [24,25] which are active in olefins metathesis.…”

Section: Introductionmentioning

confidence: 99%

Quantum chemical simulation of MoO3 dispergation on hydroxylated SiO2 surface

et al. 2021

View full text Add to dashboard Cite

Метою даної роботи є оцінка енергетичної сприятливості утворення різних молібдатних груп (≡Si‑O‑)2Mo(=O)2 та =Si(‑O‑)2Mo(=O)2 під час термічно ініційованого диспергування MoO3 на гідроксильованій поверхні SiO2. Для цього було здійснено квантовохімічне моделювання реакції O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O в температурному інтервалі 300–1100 K із використанням обмеженого методу Хартрі-Фока (наближення ЛКАО) з валентним базисом SBKJC (Stevens-Basch-Krauss-Jasien-Cundari). Кластер O12Si10(OH)16, який являє собою структурний фрагмент кристала β‑кристобаліту, був використаний як модель високогідроксильованої поверхні кремнезему. Ми розглянули дві структури молібдатних груп (≡Si‑O‑)2Mo(=O)2, прикріплених до кремнеземного кластера O12Si10(OH)16 через силанольні групи. Молібдатні групи (Etot ‑584.60147 Hartree), прикріплені до кремнеземного кластера через віддалені силанольні групи, виявляються більш енергетично вигідними, ніж молібдатні групи (Etot ‑584.56565 Hartree), прикріплені до кремнеземного кластера через сусідні силанольні групи. Енергія молібдатних груп =Si(‑O‑)2Mo(=O)2 (Etot ‑584.48399 Hartree), прикріплених до кремнеземного кластера O12Si10(OH)16 через силандіольні групи, менш енергетично вигідні в порівнянні з подібними групами, прикріпленими через силанольні групи, через більше напруження кута між зв’язками. Знайдено, що реакція O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O в температурному інтервалі 300–1100 K, змодельована шляхом квантовохімічних розрахунків, свідчить, що процес диспергування MoO3 на гідроксильованій поверхні SiO2 є енергетично вигідним. Експ The aim of the present work is to evaluate the energetic favourability of the formation of different molybdate species (≡Si‑O‑)2Mo(=O)2 and =Si(‑O‑)2Mo(=O)2 during the thermally induced MoO3 dispergation on hydroxylated SiO2 surface. In order to do this a quantum chemical modelling of the reaction O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O within the temperature interval of 300–1100 K was undertaken using the Restricted Hartree-Fock method (the LCAO approximation) with the SBKJC (Stevens-Basch-Krauss-Jasien-Cundari) valence basis set. The cluster O12Si10(OH)16 which represents a structural fragment of a β‑cristobalite crystal was used in this work as a model of highly hydroxylated silica surface. We considered two structures of molybdate (≡Si‑O‑)2Mo(=O)2 species attached to O12Si10(OH)16 silica cluster via silanol groups. Molybdate species (Etot ‑584.60147 Hartree) attached to silica cluster via distant silanols appeared more energetically favourable than molybdate species (Etot ‑584.56565 Hartree) attached to silica cluster via nearby silanols. The energy of molybdate =Si(‑O‑)2Mo(=O)2 species (Etot ‑584.48399 Hartree) attached to O12Si10(OH)16 silica cluster via silanediol group is less favourable energetically in comparison with those attached via silanol groups because of higher bond angle straining. The reaction O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O in the temperature interval of 300–1100 K which simulates by quantum chemical calculations the dispergation of MoO3 on hydroxylated SiO2 surface was found to be energetically favourable. The experimentally optimised temperature of ca. 800 K required for dispergation of MoO3 on hydroxylated SiO2 surface is determined by MoO3 evaporation and transportation via the gas phase. ериментальна оптимальна температура (близько 800 K), потрібна для диспергування MoO3 на гідроксильованій поверхні SiO2, визначається випаровуванням та перенесенням MoO3 в газовій фазі.

show abstract

“…During the last years, supported molybdenum oxide catalysts have been object of great interest because of their importance in environmental catalysis and in many industrial reactions such as hydrodesulfuration (HDS) [1][2][3][4][5][6][7][8]. These catalysts are normally obtained by impregnating the catalytically active molybdenum oxide species on an inorganic oxide support (Al 2 O 3 , SiO 2 , TiO 2 , and ZrO 2 ) for the purpose of (1) increasing the catalytic activity and selectivity, (2) extending the life of the catalysts, and (3) augmenting the mechanical strength of the catalysts.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles of TiAlZr mixed oxides as supports of hydrodesulfurization catalysts: Synthesis and characterization

Kraleva

Spojakina

Saladino

et al. 2012

Journal of Alloys and Compounds

View full text Add to dashboard Cite

a b s t r a c tTiAlZr mixed oxides, synthesized using sol-gel method, were characterized and used as supports of hydrodesulfurization catalysts (12 wt% Mo) prepared by impregnation either with molybdenum heteropolyacid H 3 PMo 12 O 40 or its cobalt salt Co 1.5 PMo 12 O 40 . Structure, morphology and textural properties of oxides and catalysts were characterized using X-ray powder diffraction (XRD), Raman spectroscopy, Nitrogen adsorption porosimetry, TEM-EDS, temperature-programmed desorption (TPD) and temperature-programmed reduction (TPR) techniques. Activity of the catalytic systems was tested in thiophene hydrodesulfurization (HDS).No formation of a new oxide phase was revealed in the synthesized mixed materials. However the effect of separated oxides on the structure of ternary oxides was observed. Maximum in HDS activity of Mo containing samples was determined by optimum content of alumina in the mixed oxides. Incorporation of cobalt into the heteropolyacid increased the HDS activity about two times and masked the effect of the support composition.

show abstract

Metathesis of linear α-olefins with MoO3 supported on MCM-41 catalyst

Cited by 12 publications

References 16 publications

Catalytic combustion of benzene over metal oxides supported on SBA-15

Catalytic combustion of benzene over metal oxides supported on SBA-15

Quantum chemical simulation of MoO3 dispergation on hydroxylated SiO2 surface

Nanoparticles of TiAlZr mixed oxides as supports of hydrodesulfurization catalysts: Synthesis and characterization

Contact Info

Product

Resources

About