Na2WO4/Mn/SiO2 catalyst for oxidative dehydrogenation of ethane using CO2 as oxidant

Zhu, Jianqiang; Qin, Song; Ren, Songtao; Peng, Xiaoxi; Tong, Dongmei; Hu, Changwei

doi:10.1016/j.cattod.2009.07.074

Cited by 35 publications

(11 citation statements)

References 24 publications

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“…Over the last decades, a wide range of catalytic systems such as Cr [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33], Ga [34][35][36][37][38], Ce [39,40], Zn [41], Co [2,[42][43][44], La [45,46], Fe [47], V [48,49], Ni [44,46,50], Mo [44,51], In [52] and Mn [47,53] have been investigated for alkane dehydrogenation in the presence of CO 2 . Among the studied materials, silica-supported chromium oxide has been proposed as the most promising catalytic system for ethane dehydrogenation [13,19,21,26,54].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO2

et al. 2020

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Ti modification of mesoporous silica support has been reported as an effective way to enhance Cr–Ti–Si interactions that, in turn, impact the catalytic dehydrogenation of ethane with CO2. However, such modification necessitates a repeated, time-consuming and tedious process. In this work, a simple, fast and facile approach has been utilized to synthesize chromium-oxide-loaded titania–silica mesoporous nanocomposites. A series of Cr(y)/Ti(x)–Si mesoporous nanocomposite catalysts with varying Ti and Cr contents were prepared and tested in the dehydrogenation of ethane with carbon dioxide. The as-synthesized catalysts were characterized by XRD, TEM, SEM, BET, UV–Vis–DR, XPS and H2–TPR techniques. The effect of titanium content, as well as chromium loading on the performance of the prepared Cr(y)/Ti(x)–Si catalysts, was investigated. It was found that 2.2 and 8 wt % are the optimum titanium and chromium contents in the synthesized catalysts for obtaining the highest catalytic activity. The superior catalytic performance of the Cr(8)/Ti(2.2)–Si catalyst can be attributed to a higher dispersion of the Cr species, as well as a higher content of the redox Cr species on the surface of the Cr/Ti–Si catalyst. The results showed that the Cr(8)/Ti(2.2)–Si catalyst efficiently dehydrogenated C2H6 in the presence of CO2 giving a 52.3% ethane conversion and 48.0% ethylene yield at 700 °C reaction temperature.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO2

et al. 2020

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“…Various catalytic systems containing active species, such as: Cr [1,8,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], Ga [29][30][31][32][33][34], Ce [35,36], Zn [34], Co [37][38][39][40], La [41,42], Fe [43], V [44,45], Ni [40,42,46], Mo [40,47], In [48], and Mn [43,49] have been investigated for oxidative dehydrogenation (ODH) of light alkanes with CO 2 . Among the investigated catalytic systems, chromia-based catalyst emerged as the most promising catalytic system for this reaction [8,15,16,21,…”

Section: Introductionmentioning

confidence: 99%

Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide

et al. 2019

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Oxidative dehydrogenation of alkanes to alkenes by a mild oxidant such as carbon dioxide is an active area of research. A series of MCM41-supported bimetallic oxide catalysts containing chromium oxide in addition to metal oxides (Ce, Co, Zn, V, Nb, and Mo) has been prepared. The binary catalysts have Cr metal oxide incorporated into MCM41 structure while the other oxides are either incorporated with Cr or impregnated on the MCM41 surface. The synthesized catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 sorption, scanning electron microscopy (SEM), hydrogen temperature programmed reduction (H2-TPR), and Diffuse reflectance UV–vis spectroscopy (DRS). The catalytic activity of Cr(4)-M(4)/MCM-41 catalysts in the dehydrogenation of ethane with CO2 was investigated. The textural properties of the synthesized samples showed that the addition of the bimetallic oxides did not disturb the mesoporous structure of MCM41 and the prepared catalysts exhibited a high BET surface area; however, the lowest surface area was recorded for Cr(4)-Mo(4)/MCM41 catalyst at 701 m2/g. Among the prepared catalysts, H2-TPR profile of Cr(4)-Ce(4)/MCM41 revealed the increase in the concentration of Cr6+ species which interacted with the framework of siliceous support. On the other hand, H2-TPR profiles of Cr(4)-Co(4)/MCM41 showed wide reduction peaks centered at 400 °C which is ascribed to reduction of Cr6+ to Cr3+ species and Co3O4 to metallic Co. At the same time, Cr(4)-Mo(4)/MCM41 and Cr(4)-V(4)/MCM41 exhibited higher temperature reduction peaks, indicating these two catalysts require higher activation temperatures. The synergy between the Cr with Zn or Nb metals reduced the concentration of Cr6+ species which is reflected in their catalytic performance. Cr(4)-Ce(4)/MCM41 recorded the highest catalytic activity toward ethylene production where the ethane conversion and ethylene yield were 37.9% and 35.1%, respectively.

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“…Previous work shows that typical catalysts used for CO 2 -assisted dehydrogenation of ethane are Ga-based oxides (6,8), Cr-based oxides (9,(12)(13)(14)(15)(16), Co-based oxides (17,18), metal carbides (1,19), and other catalysts (7,20,21). However, details are lacking on the nature of the active sites for the activation of CO 2 and ethane and how to selectively control the C-H and C-C bond scission to increase the ethylene selectivity.…”

mentioning

confidence: 99%

Active sites for tandem reactions of CO ₂ reduction and ethane dehydrogenation

Yan

Yao

Kattel

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

133

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Ethylene (CH) is one of the most important raw materials for chemical industry. The tandem reactions of CO-assisted dehydrogenation of ethane (CH) to ethylene creates an opportunity to effectively use the underutilized ethane from shale gas while mitigating anthropogenic CO emissions. Here we identify the most likely active sites over CeO-supported NiFe catalysts by using combined in situ characterization with density-functional theory (DFT) calculations. The experimental and theoretical results reveal that the Ni-FeO interfacial sites can selectively break the C-H bonds and preserve the C-C bond of CH to produce ethylene, while the Ni-CeO interfacial sites efficiently cleave all of the C-H and C-C bonds to produce synthesis gas. Controlled synthesis of the two distinct active sites enables rational enhancement of the ethylene selectivity for the CO-assisted dehydrogenation of ethane.

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Na2WO4/Mn/SiO2 catalyst for oxidative dehydrogenation of ethane using CO2 as oxidant

Cited by 35 publications

References 24 publications

Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO2

Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO2

Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide

Active sites for tandem reactions of CO ₂ reduction and ethane dehydrogenation

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Na2WO4/Mn/SiO2 catalyst for oxidative dehydrogenation of ethane using CO2 as oxidant

Cited by 35 publications

References 24 publications

Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO2

Synthesis, Characterization and Catalytic Evaluation of Chromium Oxide Deposited on Titania–Silica Mesoporous Nanocomposite for the Ethane Dehydrogenation with CO2

Synergetic Impact of Secondary Metal Oxides of Cr-M/MCM41 Catalyst Nanoparticles for Ethane Oxidative Dehydrogenation Using Carbon Dioxide

Active sites for tandem reactions of CO 2 reduction and ethane dehydrogenation

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Active sites for tandem reactions of CO ₂ reduction and ethane dehydrogenation