Characterizations and catalytic properties of Cr-MCM-41 prepared by direct hydrothermal synthesis and template-ion exchange

Wang, Ye; Ohishi, Yoshihiko; Shishido, Tetsuya; Zhang, Qinghong; Yang, Wei; Guo, Qian; Wan, Huilin; Takehira, Katsuomi

doi:10.1016/s0021-9517(03)00278-1

Cited by 136 publications

(120 citation statements)

References 50 publications

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…The pre-edge obtained from Cr-containing mesoporous silica represented tetrahedrally coordinated Cr 6+ species. 16 Journal of the Ceramic Society of Japan 123 [12] 1084-1089 2015 JCS-Japan in FSM-16 was directly exchanged with Cr species during the TIE.…”

Section: Characterization Of Fsm-16 and Cr-fsm-16mentioning

confidence: 99%

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

Ehiro

Itagaki

Kurashina

et al. 2015

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

The template ion exchange of chromium cations into FSM-16 (#16 Folded Sheets Mesoporous Materials) for 247 h resulted in a 2.89 wt % incorporation of those cations into the FSM-16, although only a 0.3 wt % incorporation had previously been reported. The XRD pattern of the resultant solid (Cr-FSM-16) showed that the hexagonal structure characteristic of FSM-16 remained after the 2.89 wt % incorporation of chromium cations. XPS could be used to detect the Cr 3+ and Cr 6+ species on the surface of Cr-FSM-16. A pre-edge peak that was due to a tetrahedrally coordinated Cr 6+ species was confirmed in the XANES spectrum of the Cr-FSM-16, which showed that the coordination state around some Cr species was similar to that around the Si species in FSM-16. With the increase in the amount of chromium cations in FSM-16, its catalytic activity and stability during the oxidative dehydrogenation of isobutane were evidently improved.

show abstract

Section: Characterization Of Fsm-16 and Cr-fsm-16mentioning

confidence: 99%

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

Ehiro

Itagaki

Kurashina

et al. 2015

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

show abstract

“…The utilization of carbon dioxide as a mild oxidant for the selective dehydrogenation of small alkanes to their respective alkenes has gained much interest in recent years and is believed to be an attractive alternative to the traditional dehydrogenation [8][9][10][11][12][13][14][15]. Deep oxidation of the desirable dehydrogenation product to CO and CO 2 can be avoided via employing CO 2 instead of O 2 .…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

et al. 2016

View full text Add to dashboard Cite

A series of vanadia catalysts supported on SBA-15 (V/SBA) with a vanadia (V) content ranging from 1% to 11% were prepared by an incipient wetness method. Their catalytic behavior in the dehydrogenation of isobutane to isobutene with CO 2 was examined. The catalysts were characterized by N 2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and temperature-programmed reduction (TPR). It was found that these catalysts were effective for the dehydrogenation reaction, and the catalytic activity is correlated with the amount of dispersed vanadium species on the SBA-15 support. The 7% V/SBA catalyst shows the highest activity, which gives 40.8% isobutane conversion and 84.8% isobutene selectivity. The SBA-15-supported vanadia exhibits higher isobutane conversion and isobutene selectivity than the MCM-41-supported one.

show abstract

“…species [36,37]. The Raman bands at 896 (weak), 970 (strong), and 1061 (weak) cm -1 can be attributed to Cr 6? species [22] and the band at 970 cm -1 is smaller in Raman shift than that at 980 cm -1 which is due to the Cr-O stretching of monochromate species in Cr-SBA-15 [31,38]. The peaks in the range 690-1017 cm -1 are due to the polychromatic Cr 6?…”

Section: Laser-raman Resultsmentioning

confidence: 89%

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

et al. 2017

View full text Add to dashboard Cite

Unmodified and sulfate-modified SBA-15-supported Cr 2 O 3 catalysts were prepared by impregnation method. The physico-chemical properties of the supports and catalysts were determined by nitrogen adsorption/ desorption, powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-DRS), inductively coupled plasma optical emission spectroscopy (ICP-OES), transmission electron microscopy (TEM) and temperature-programmed reduction (TPR) techniques. Oxidative dehydrogenation of ethane to ethylene (ODE) with CO 2 as oxidant was carried out on these catalysts in a fixed-bed reactor at temperatures in the range of 600-700°C and at atmospheric pressure. The changes in structural and textural properties because of sulfate modification were identified. Sulfate modification affected the nature of interaction of CrO x species with the SBA-15 support. During the evaluation, it was observed that sulfate modification enhances ethane conversion and ethylene selectivity of the catalyst. Better dispersion of CrO x and the increase in Cr 6? /Cr 3? ratio seem to be the reasons for the higher performance of the sulfate-modified catalysts compared to that of the unmodified catalyst.

show abstract

Characterizations and catalytic properties of Cr-MCM-41 prepared by direct hydrothermal synthesis and template-ion exchange

Cited by 136 publications

References 50 publications

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

Contact Info

Product

Resources

About