Bimetallic V and Ti incorporated MCM-41 molecular sieves and their catalytic properties

Li, Baoshan; Wu, Naijin; Wu, Kai; Liu, Jianjun; Han, Chunying; Li, Yuanxing

doi:10.1039/c4ra13600d

Cited by 12 publications

(4 citation statements)

References 43 publications

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“…For example, the highly dispersed VO x and TeO x species were incorporated into mesoporous silica via an evaporation‐induced self‐assembly route, synergetic effect of VO x and TeO x species promote direct oxidation of propane to acrolein [19] . Other bimetallic incorporated VTi‐MCM‐41, [20] VMo‐MCM‐41, [21] and VCe‐SBA‐15 [22] molecular sieves were also synthesized. Their distribution and coordination environment are affected enormously by the concentrations and chemical property of metal precursors, and it is hard to control the simultaneous hydrolyzation of multi‐kind of metal precursors and silicon precursors to confine the metal cations into the silica framework uniformly.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Vanadium‐Titanium‐Incorporated Mesoporous Silica Catalysts for the Oxidative Dehydrogenation of Propane

et al. 2022

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A series of vanadium and titanium‐incorporated mesostructured cellular foams (MCF) silica with different vanadium contents were synthesized by direct hydrothermal method, which applied as catalysts for the oxidative dehydrogenation of propane (ODP). Vanadium doping amount significantly affects the distribution and coordination environment of VOx and TiOx species on the MCF silica. With the increasing of V content, the TiOx species incorporated into silica framework were substituted by some framework V species to form more polymeric or small TiO2 nanoclusters. VOx species were incorporated on both silica surface and TiOx species surface. The interaction between highly dispersed VOx and polymerized TiO2 enhanced the C3H6 formation rate. The 3 V5Ti/MCF catalysts showed the highest propylene productivity (4.2 kgpropylene kgcat−1 h−1, at 500 °C) among the xV5Ti/MCF catalysts because of the highest concentration isolated/oligomeric VOx species incorporated on the appropriate polymerized TiO2 surface.

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Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Vanadium‐Titanium‐Incorporated Mesoporous Silica Catalysts for the Oxidative Dehydrogenation of Propane

et al. 2022

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“…Several families of bimetallic catalysts have been commercialized for use in industrial environmental treatment, chemical synthesis and petroleum refining processes. Lately, several work studies of the synthesis bimetallic catalyst containing both titanium and heteroatom such as Fe, Al or B in MFI structure have been reported [13][14][15]. The reactions are usually performed on powder catalyst but only a few reactions had been managed on thin film or membrane forms.…”

Section: List Of Figuresmentioning

confidence: 99%

“…Nitrogen adsorption/desorption isotherms for the titanium silicalite-1 seed, vanadium titanium silicalite-1 and iron titanium-silicalite-1 were shown in Figure 4. 13 The result indicated isotherm type I that referred to the microporous materials corresponding the IUPAC classification [48]. The hysteresis loop at a high pressure of each sample demonstrated H4-type that showing a characteristic of microporous material The hysteresis loop of iron titanium silicaite-1 and vanadium silicalite-1 are much larger than the titanium silicalite-1 seed, which could be due to the existence of the metal oxide particles [31].…”

Section: The Etching the Silicon Substratementioning

confidence: 99%

Titanosilicate porous thin film on silicon substrate as catalyst for hydroxylation of phenol in continuous flow reactor

Sriyanai

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This research investigated the preparation of titanium silicalite-1 and metal titanium silicalite-1 materials. The synthesized materials were applied into 2 parts as powder and thin film forms. Both titanium silicalite-1 form and metal titanium silicalite-1 thin film were synthesized by seeding together with hydrothermal method, while metal titanium silicalite-1 powder was prepared by hydrothermal method. The silicon wafer is used as substrate for synthesizing thin film material. The interested metals in this research were vanadium and iron. All synthesized materials were characterized by X-ray powder diffraction, DR-UV spectrophotometry, N2 adsorption-desorption, scanning electron microscopy and inductively coupled plasma mass spectrometry. All prepared materials showed characteristic of MFI structure. The smaller particle size was resulted from the higher seed loading as 10 wt.% base on silica source. After metal addition, the crystallinity of synthesized materials was decreased. The catalytic activities of synthesized materials were investigated in phenol hydroxylation with hydrogen peroxide. All powder synthesized materials were carried out in batch reactor. The influence of reaction parameter, including mole ratio of phenol/ hydrogen peroxide and reaction temperature were examined. Among several of particle size of titanium silicalite-1 catalysts, the titanium silicalite-1 seed illustrated the highest phenol conversion at 30.36% due to the smallest of particle size. The iron titanium silicalite-1 demonstrated high phenol conversion and highest catechol selectivity as 43.46 and 64.5%, respectively. In the continuous flow reactor at 4 µl/min displayed the highest phenol conversion when titanium silicalite-1 thin film was used. The phenol conversion of iron titanium silicalite-1 thin film was lower than titanium silicalite-1 thin film due to the thinner film thickness. However, iron titanium silicalite-1 provided the high selectivity to catechol same as in batch reaction.

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“…In addition, many researchers try to develop the benzene hydroxylation capacity of catalysts. However, titanosilicate is one of the most popular catalysts for the oxidation reaction such as TS-1 [36], Ti-SBA-15 [37] and Ti-MCM-41 [38].…”

Section: Benzene Hydroxylationmentioning

confidence: 99%

Synthesis of transition metal-titanosilicate catalysts for benzene hydroxylation

Wongsuwan

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The microporous (TS-1 and Ti-MWW) and mesoporous (Ti-MCA and Ti-SBA-15) titanosilicates with the transition metal were successfully synthesized by hydrothermal followed by impregnation method. The transition metals in this study were Ce, Cu, Fe, and V. All synthesized products were characterized the physical properties by using X-ray powder diffraction, N2 adsorption-desorption, DR-UV spectrophotometry, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and inductively coupled plasma mass spectrometry (ICP-MS). After the bimetallic catalysts modification, the porous materials still preserved structure of parent materials. Moreover, the second metal was dispersed on the surface of titanosilicate supporter which confirmed by TEM results. The catalytic activity of the prepared catalysts was evaluated in the benzene hydroxylation with hydrogen peroxide as the oxidizing agent. Among various kind of second metals, V presented the best catalytic activity in all titanosilicate supports. The presence of V in catalyst remarkably enhanced catalytic oxidation capacity because of the increase of active site. Nature and dispersion of vanadium species as well as structure of titanosilicate support had tremendous effect on the yield of phenol product. At the optimum reaction condition of each catalyst, vanadium supported on Ti-MWW with 5 wt.% V-content showed highest catalytic performance with 14.72% yield of phenol. The three-dimensional and unique pore system of Ti-MWW made the efficient diffusion and transport of reactants resulting in high catalytic performance. The optimum condition in benzene hydroxylation was carried at benzene: H2O2 mole ratio of 1:3, 0.1 g of 5 wt.% V/Ti-MWW, acetonitrile 5.66 g, 55˚C for 3 h.

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Bimetallic V and Ti incorporated MCM-41 molecular sieves and their catalytic properties

Abstract: V and Ti atoms incorporated into the framework of MCM-41 in the form of tetrahedral coordination with excellent catalytic performance.

Cited by 12 publications

References 43 publications

Design and Synthesis of Vanadium‐Titanium‐Incorporated Mesoporous Silica Catalysts for the Oxidative Dehydrogenation of Propane

Design and Synthesis of Vanadium‐Titanium‐Incorporated Mesoporous Silica Catalysts for the Oxidative Dehydrogenation of Propane

Titanosilicate porous thin film on silicon substrate as catalyst for hydroxylation of phenol in continuous flow reactor

Synthesis of transition metal-titanosilicate catalysts for benzene hydroxylation

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