Low-Temperature Isomerization of 1-Butene on Mo2N/γ-Al2O3Catalyst Studied by in Situ FT-IR Spectroscopy

Wu, Zili; Li, Can; Ying, Pinliang; Wei, Zhimei; Xin, Qin

doi:10.1021/jp003864f

Cited by 23 publications

(22 citation statements)

References 45 publications

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“…These adsorbed complexes can easily undergo isomerization, oligomerization, and cracking reactions even at room temperature . This complex band can also be assigned to the presence and reaction of butene isomers according to the results reported by Wu et al . A very weak band at 3700 cm −1 could also be recognized.…”

Section: Resultssupporting

confidence: 63%

“…In this work, one of the main reaction products is propene. On the other hand, according to the DRIFTS analysis, the oligomerization observed over Ni/MCM‐41 and Ni/AlMCM‐41 catalysts takes place in a very different manner in contrast to zeolitic materials, clays, and some metal‐based catalysts . For these materials, high intensity bands were observed in the interval 3000 – 2800 cm −1 .…”

Section: Resultsmentioning

confidence: 96%

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Experimental Investigation of the Reaction Network of Ethene to Propene over Ni/AlMCM‐41 Catalysts

Perea

Felischak

Wolff

et al. 2017

Chemie Ingenieur Technik

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The reaction network of the ethene-to-propene (ETP) reaction over Ni/AlMCM-41 catalysts was studied. This reaction consists of the dimerization of ethene, the isomerization of 1-butene, and the metathesis of ethene and 2-butene to propene. This work focused on the latter. ETP experiments followed by in situ diffuse reflectance infrared Fourier transform spectroscopy were carried out. Metathesis activities were evaluated by the isomerization of butenes, the metathesis of ethene and 2-butene, and the retro-metathesis of propene. Metathesis activities of Ni/AlMCM-41 catalysts were not observed. Thus, a conjunct polymerization of ethene to propene is proposed.

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 96%

Experimental Investigation of the Reaction Network of Ethene to Propene over Ni/AlMCM‐41 Catalysts

Perea

Felischak

Wolff

et al. 2017

Chemie Ingenieur Technik

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“…The IR bands in the n CH region are quite similar in positions to those observed on Mo sulfide [24][25][26] and nitride 19,21 catalysts upon adsorption of thiophene/H 2 at high temperatures. So they can be also assigned to the vibrations of CH 2 and CH 3 groups of adsorbed C 4 hydrocarbon species 19,[21][22][23][24][25][26][27][28][29][30][31] that are derived from the HDS of thiophene.…”

Section: Thiophene Hydrogenolysis At Different Temperaturesmentioning

confidence: 99%

Adsorption and reaction of thiophene and H2S on Mo2C/Al2O3 catalyst studied by in situ FT-IR spectroscopy

Feng

et al. 2004

Phys. Chem. Chem. Phys.

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The reactions of both thiophene and H 2 S on Mo 2 C/Al 2 O 3 catalyst have been studied by in situ FT-IR spectroscopy. CO adsorption was used to probe the surface sites of Mo 2 C/Al 2 O 3 catalyst under the interaction and reaction of thiophene and H 2 S. When the fresh Mo 2 C/Al 2 O 3 catalyst is treated with a thiophene/H 2 mixture above 473 K, hydrogenated species exhibiting IR bands in the regions 2800-3000 cm À1 are produced on the surface, indicating that thiophene reacts with the fresh carbide catalyst at relatively low temperatures. IR spectra of adsorbed CO on fresh Mo 2 C/Al 2 O 3 pretreated by thiophene/H 2 at different temperatures clearly reveal the gradual sulfidation of the carbide catalyst at temperatures higher than 473 K, while H 2 S/H 2 can sulfide the Mo 2 C/Al 2 O 3 catalyst surface readily at room temperature (RT). The sulfidation of the carbide surface by the reaction with thiophene or H 2 S maybe the major cause of the deactivation of carbide catalysts in hydrotreating reactions. The surface of the sulfided carbide catalyst can be only partially regenerated by a recarburization using CH 4 /H 2 at 1033 K. When the catalyst is first oxidized and then recarburized, the carbide surface can be completely reproduced.

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“…3,[7][8][9] In brief, a passivated Mo 2 N/g-Al 2 O 3 sample was pressed into a self-supporting wafer (ca. 15 mg cm…”

Section: Ir Studiesmentioning

confidence: 99%

Microcalorimetric and IR spectroscopic studies of CO adsorption on molybdenum nitride catalysts

Maroto-Valiente

Guerrero-Ruı́z

et al. 2003

Phys. Chem. Chem. Phys.

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The adsorption of CO on both nitrided and reduced passivated Mo 2 N catalysts in either alumina supported or unsupported forms was studied by adsorption microcalorimetry and infrared (IR) spectroscopy. The CO is adsorbed on nitrided Mo 2 N catalysts on three different surface sites: 4-fold vacancies, Mo d+ (0 < d < 2) and N sites, with differential heats of CO adsorption decreasing in the same order. The presence of the aluminasupport affects the energetic distribution of the adsorption sites on the nitrided Mo 2 N, i.e. weakens the CO adsorption strength on the different sites and changes the fraction of sites adsorbing CO in a specific form, revealing that the alumina supported Mo 2 N phase shows lower electron density than pure Mo 2 N. On reduced passivated Mo 2 N catalysts the CO was found to adsorb mainly on Mo 4+ sites, although some slightly different surface Mo d+ (0 < d < 2) sites are also detected. The nature, density and distribution of surface sites of reduced passivated Mo 2 N/g-Al 2 O 3 were similar to those on reduced MoO 3 /g-Al 2 O 3 .

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Low-Temperature Isomerization of 1-Butene on Mo₂N/γ-Al₂O₃Catalyst Studied by in Situ FT-IR Spectroscopy

Cited by 23 publications

References 45 publications

Experimental Investigation of the Reaction Network of Ethene to Propene over Ni/AlMCM‐41 Catalysts

Experimental Investigation of the Reaction Network of Ethene to Propene over Ni/AlMCM‐41 Catalysts

Adsorption and reaction of thiophene and H2S on Mo2C/Al2O3 catalyst studied by in situ FT-IR spectroscopy

Microcalorimetric and IR spectroscopic studies of CO adsorption on molybdenum nitride catalysts

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