Mesoporous high surface area NiO synthesized with soft templates: Remarkable for catalytic CH4 deep oxidation

Xu, Xianglan; Li, Lin; Yu, Fan; Peng, Honggen; Fang, Xiuzhong

doi:10.1016/j.mcat.2017.08.005

Cited by 89 publications

(58 citation statements)

References 43 publications

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“…[9] Diverse experimental techniques and conditions have been applied to prepare NiO nanorods using Ni(NO 3 ) 2 and Aloe vera leaf extract solution, [10] or a mesoporous NiO in the form of nanorods as a selective gas sensor for ammonia. [11] Additionally, Xu et al [12] applied a soft templates method to produce mesoporous high surface area NiO for deep oxidation of CH 4 . Various publications have reported the green and biosynthesis of NiO nanoparticles by the aid of several biomaterials, such as Solanum trilobatum extract, [13] Ananas comosus leaf extract, [14] Cactus plant extract, [15] Okra plant extract [16] and Phoenix dactylifera extract.…”

Section: Introductionmentioning

confidence: 99%

Boosting NiO Catalytic Activity by x wt % F‐ions and K₂O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

et al. 2021

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Herein, the synthesis of pure and modified mesoporous nanocrystalline NiO is reported. The catalyst was modified with different wt % F-ions or K 2 O and used to produce Methyl ethyl ketone (MEK) as a potential fuel/solvent. XRD analysis of the promoted catalysts confirmed the formation of Ni-metal covered by the host oxide, compared with pure NiO, especially for the promoted catalysts with x wt % F-ions. CO 2 -TPD results demonstrated the existence of different basic sites over these catalysts with varying strength. The catalytic conversion of sec-butanol (SB) into MEK over the parent NiO catalyst showed 52 % and 76.8 % conversion of SB at 250 and 275°C, respectively, with higher selectivity to MEK > 96 %. Among the promoted catalysts, NiO-10 wt % F À and NiO-1 wt % K 2 O catalysts showed 99 and 95 % conversion, respectively, with retaining the MEK selectivity of � 96 %. The catalytic activity, of the most active catalysts, was correlated with the presence of Ni/NiO interfaces, different types of basic sites, especially strong basic sites, and the surface area and porosity measurements.

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Section: Introductionmentioning

confidence: 99%

Boosting NiO Catalytic Activity by x wt % F‐ions and K₂O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

et al. 2021

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“…Analysis of the Ti 2p spectra (Figure S14b, Supporting Information) of Ni SA /TiO 2 *, TiO 2 *, and TiO 2 samples shows that after nickel deposition, the TiO 2 * is partially oxidized since the binding energy measured was 458.7 eV for TiO 2 *, 458.8 eV for TiO 2 , and 458.9 eV for Ni SA /TiO 2 *. For the Ni/TiO 2 sample, the spectrum obtained is typical of NiO (853.7 eV), [ 78 ] with a peak at 853.8 eV and a peak splitting as expected at 855.9 eV (Figure S15, Supporting Information). The fact that these XPS analyses were performed without avoiding air exposure explains the nickel oxidation.…”

Section: Resultsmentioning

confidence: 86%

Stabilization of Metal Single Atoms on Carbon and TiO₂ Supports for CO₂ Hydrogenation: The Importance of Regulating Charge Transfer

Rivera‐Cárcamo

Scarfiello

Garcı́a

et al. 2020

Adv Materials Inter

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Supported single atoms constitute excellent models for understanding heterogenous catalysis and have achieved breakthroughs during the past years. How to prevent the aggregation and modulate activity of these species via metal‐support interaction should be considered for practical applications. This work presents simple methods involving the creation of carbon‐ (on carbon nanotube (CNT)) or oxygen‐vacancies (on TiO2) to stabilize nickel and ruthenium single atoms. The defective supports and the resulting catalysts are characterized by a large variety of techniques. These analyses show that this strategy is efficient for the preparation of ultra‐dispersed catalysts. Comparison of the catalytic performances of these catalysts for the CO2 hydrogenation reaction is also reported. Catalysts supported on TiO2 are more active and sometimes more stable than those deposited on CNT. Nickel catalysts are very selective for the production of CO, and ruthenium catalysts are more selective for the production of methane. Most importantly, it is shown that, in the case of Ru, a direct correlation exists between the electronic density on the metal and the selectivity; electron‐rich species produce selectively methane, while electron‐deficient species orientate the selectivity toward CO. This work may figure a new way for the synthesis of ultra‐dispersed catalysts for various applications.

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“…Large specific surface area and uniform pore size can expedite the diffusion of reactants and products, increase the exposure of active sites on the surface of catalyst, and produce more surface defects and oxygen vacancies, thereby have a positive effect on the catalytic oxidation of VOCs. [ 38 ]…”

Section: Resultsmentioning

confidence: 99%

“…[37] The textural properties in terms of BET surface area, pore volume, and average pore size are listed in Table 1 Figure 3b, it is obvious that the pore sizes of the samples synthesized in the presence of F 127 are much uniform compared with Co 3 O 4 C. Large specific surface area and uniform pore size can expedite the diffusion of reactants and products, increase the exposure of active sites on the surface of catalyst, and produce more surface defects and oxygen vacancies, thereby have a positive effect on the catalytic oxidation of VOCs. [38] 3.3 | Chemical states and redox behavior reduction process can be grouped into two procedures. [39] The first reduction peak at approximately 300 C belongs to the reduction of Co 3+ to Co 2+ and the second reduction peak at about 363 C attributed to the reduction of Co 2+ to Co 0 .…”

Section: Texture Properties Of the Catalystsmentioning

confidence: 99%

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

Liu

Fan

Song

2020

Applied Organom Chemis

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Cobalt-based catalyst, as a typical catalyst for volatile organic compounds (VOCs) combustion, has attracted extensive attention. However, the catalytic activity of pure Co 3 O 4 is difficult to meet the requirements of practical application especially at low temperatures. Therefore, it is key to find an effective way to improve the catalytic performance of Co 3 O 4. In this paper, Co 3 O 4 is modified by engineering a combination of structural template and Ce dopant. The various characterization results verify that the template agent and the doping of appropriate Ce lead to great changes in the texture property and low temperature reducibility of Co 3 O 4 , thus resulting in superior catalytic performances of obtained mesoporous Ce x CoO catalysts. In particular, the best catalyst, Ce 0.05 CoO, achieves a toluene conversion of T 90% at 238 C, which is significantly lower than many of the Co-based catalysts reported in previous literatures. Furthermore, the toluene conversion rate maintains above 90% during 100 h at 238 C. The excellent catalytic performance of Ce 0.05 CoO can be attributed to its large specific surface area, uniform pore structure, good low temperature reducibility, and abundant surface oxygen species.

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Mesoporous high surface area NiO synthesized with soft templates: Remarkable for catalytic CH4 deep oxidation

Cited by 89 publications

References 43 publications

Boosting NiO Catalytic Activity by x wt % F‐ions and K₂O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

Boosting NiO Catalytic Activity by x wt % F‐ions and K₂O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

Stabilization of Metal Single Atoms on Carbon and TiO₂ Supports for CO₂ Hydrogenation: The Importance of Regulating Charge Transfer

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

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Mesoporous high surface area NiO synthesized with soft templates: Remarkable for catalytic CH4 deep oxidation

Cited by 89 publications

References 43 publications

Boosting NiO Catalytic Activity by x wt % F‐ions and K2O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

Boosting NiO Catalytic Activity by x wt % F‐ions and K2O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

Stabilization of Metal Single Atoms on Carbon and TiO2 Supports for CO2 Hydrogenation: The Importance of Regulating Charge Transfer

Preparation of mesoporous CexCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

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Boosting NiO Catalytic Activity by x wt % F‐ions and K₂O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

Boosting NiO Catalytic Activity by x wt % F‐ions and K₂O for the Production of Methyl Ethyl Ketone (MEK) via Catalytic Dehydrogenation of 2‐Butanol

Stabilization of Metal Single Atoms on Carbon and TiO₂ Supports for CO₂ Hydrogenation: The Importance of Regulating Charge Transfer

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping