Transition metal-promoted hierarchical ETS-10 solid base for glycerol transesterification

Xiang, Mei; Wu, Dongfang

doi:10.1039/c8ra06811a

Cited by 16 publications

(6 citation statements)

References 52 publications

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“…When it comes to the catalyst with nickel species introduced by in situ doping, not only did the total CO 2 adsorption rise sharply to 1.29 mmol/g but it also presents mainly strong basic sites with the CO 2 desorption being concentrated in the temperature range higher than 500 °C. This corresponds well to our previous study that shows, other than the structure and pore topology, the presence of transition metal species and their composition, as well as the interaction with the zeolite support, all make significant contributions to enhance the basicity of ETS-10 zeolite-based catalysts (Xiang and Wu, 2018). Moreover, according to the comparison between Ni/ ETS-10 and Ni-ETS-10, though with the same metal active phase, a definite edge in CO 2 adsorption for the latter exists, especially in the high-temperature region, that further confirms the resultant hierarchical structure, the optimized metal dispersion (37.4% vs. 27.2%), and the interactions with zeolite supports which definitely endow Ni-ETS-10 with a great potential for CO 2 methanation.…”

Section: Structure Characteristics Of Ets-10-based Catalystsupporting

confidence: 92%

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

Xiang

Gao

et al. 2022

Front. Chem.

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The activation and conversion of the CO2 molecule have always been the most vexing challenge due to its chemical inertness. Developing highly active catalysts, which could overcome dynamic limitations, has emerged as a provable and effective method to promote CO2 activation–conversion. Herein, ETS-10 zeolite–based catalysts, with active nickel species introduced by in situ doping and impregnation, have been employed for CO2 methanation. Conspicuous CO2 conversion (39.7%) and perfect CH4 selectivity (100%) were achieved over the Ni-doped ETS-10 zeolite catalyst at 280°C. Comprehensive analysis, which include X-ray diffraction, N2 adsorption–desorption, SEM, TEM, H2 chemisorption, CO2 temperature programmed desorption, and X-ray photoelectron spectroscopy, was performed. Also, the results indicated that the resultant hierarchical structure, high metal dispersion, and excellent CO2 adsorption–activation capacity of the Ni-doped ETS-10 zeolite catalyst played a dominant role in promoting CO2 conversion and product selectivity.

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Section: Structure Characteristics Of Ets-10-based Catalystsupporting

confidence: 92%

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

Xiang

Gao

et al. 2022

Front. Chem.

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“…Moreover, three catalysts exhibit the Ni 2p 3/2 peaks at 855.6 and 861.3 eV, assigned to Ni 2+ species. Another two binding energy peaks of Ni 2p 1/2 are disclosed at about 873.5 and 879.4 eV, which are also ascribed to the Ni 2+ species 38. As mentioned earlier, XRD results can clearly prove that NiO species on NiO/TiO 2 can be completely reduced at 350 °C and above.…”

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confidence: 60%

Industrially Applicable Aqueous-Phase Selective Hydrogenation of Furfural on an Efficient TiO_x-Modified Ni Nanocatalyst

Zhang

Mao

2021

ACS Sustainable Chem. Eng.

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Because water is involved in the formation of furfural (FFR), aqueous-phase selective hydrogenation of FFR to furfuryl alcohol (FOL) has the potential for industrial applications, but it has not yet been well exploited. Here, partially reduced TiO x -modified Ni nanocatalysts were studied. The Ni–TiO2 interaction adjusts the Ni electron structure and affects the catalyst adsorption properties. FFR is adsorbed on the TiO x oxygen vacancy (OV) by CO, and the FOL selectivity is positively correlated with the surface OV content. The active H atoms dissociated on Ni spillover to the TiO x surface and then attack the adsorbed FFR CO. The precise synergistic effect of Ni and OV improves the comprehensive performance of FFR hydrogenation. Under mild conditions, FFR conversion can reach 92.5% and FOL selectivity can be as high as 96.8%. This is an extremely excellent performance of aqueous-phase FFR selective hydrogenation, and thus, the TiO x -modified Ni nanocatalyst is a very promising candidate for industrial applications.

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“…12. The TPD curve of Na,K-ETS-10 reveals two distinct peaks in the range ≈320–420 K and above 600 K. The desorption in the low-temperature range is presumably due to Na + or K + cations and weakly basic surface hydroxyl groups [46–47], i.e., the H-bridged Ti–OH–Si (see also Figure 3 of [31]). As a result of the post-synthetic treatment by H 2 O 2 , a decrease of the desorption peak in this temperature range for P-ETS-10/60 might be due to the partial removal of the cations (decrease of the Na wt % from 9 to 7 after treatment with H 2 O 2 , see Table 2 (last column)) and of the H-bridged surface hydroxyl groups, as is also evident from the diffuse reflectance infrared Fourier transform (DRIFT) study in [31].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of highly active ETS-10-based titanosilicate for heterogeneously catalyzed transesterification of triglycerides

Zaheer¹,

Poppitz²,

Feyzullayeva³

et al. 2019

Beilstein J. Nanotechnol.

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In this contribution, the preparation of hierarchically structured ETS-10-based catalysts exhibiting notably higher activity in the conversion of triolein with methanol compared to microporous titanosilicate is presented. Triolein, together with its unsaturated analog trilinolein, represent the most prevalent triglycerides in oils. The introduction of mesopores by post-synthetic treatment with hydrogen peroxide and a subsequent calcination step results in the generation of an additional active surface with Brønsted basic sites becoming accessible for triolein and enhancing the rate of transesterification. The resulting catalyst exhibits a comparable triolein conversion (≈73%) after 4 h of reaction to CaO (≈76%), which is reportedly known to be highly active in the transesterification of triglycerides. In addition, while CaO showed a maximum conversion of 83% after 24 h, the ETS-10-based catalyst reached 100% after 8 h, revealing its higher stability compared to CaO. The following characteristics of the catalysts were experimentally addressed – crystal structure (X-ray diffraction, transmission electron microscopy), crystal shape and size (scanning electron microscopy, laser diffraction), textural properties (N2 sorption, Hg porosimetry), presence of hydroxyl groups and active sites (temperature-programmed desorption of NH3 and CO2, 29Si magic angle spinning nuclear magnetic resonance (NMR)), mesopore accessibility and diffusion coefficient of adsorbed triolein (pulsed field gradient NMR), pore interconnectivity (variable temperature and exchange spectroscopy experiments using hyperpolarized 129Xe NMR) and oxidation state of Ti atoms (electron paramagnetic resonance). The obtained results enabled the detailed understanding of the impact of the post-synthetic treatment applied to the ETS-10 titanosilicate with respect to the catalytic activity in the heterogeneously catalyzed transesterification of triglycerides.

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Transition metal-promoted hierarchical ETS-10 solid base for glycerol transesterification

Abstract: The inherent Lewis basicity and hierarchical structure of ETS-10 favor oriented conversion of glycerol. Moreover, Ni0 species play a critical role in accelerating the interaction of Lewis basic sites with active glycerol hydroxyl groups.

Cited by 16 publications

References 52 publications

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

Industrially Applicable Aqueous-Phase Selective Hydrogenation of Furfural on an Efficient TiO_x-Modified Ni Nanocatalyst

Synthesis of highly active ETS-10-based titanosilicate for heterogeneously catalyzed transesterification of triglycerides

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Transition metal-promoted hierarchical ETS-10 solid base for glycerol transesterification

Abstract: The inherent Lewis basicity and hierarchical structure of ETS-10 favor oriented conversion of glycerol. Moreover, Ni0 species play a critical role in accelerating the interaction of Lewis basic sites with active glycerol hydroxyl groups.

Cited by 16 publications

References 52 publications

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

Boosting CO2 hydrogenation to methane over Ni-based ETS-10 zeolite catalyst

Industrially Applicable Aqueous-Phase Selective Hydrogenation of Furfural on an Efficient TiOx-Modified Ni Nanocatalyst

Synthesis of highly active ETS-10-based titanosilicate for heterogeneously catalyzed transesterification of triglycerides

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Industrially Applicable Aqueous-Phase Selective Hydrogenation of Furfural on an Efficient TiO_x-Modified Ni Nanocatalyst