Catalysts
·
2025
·Vol. 15
·期 11
·1016
·
IF 4
Yun Xu,Tianfa Tang,Pengyao Wang,Chunlei Zhang,Jianbo Zhao,Ke Zhuang,Changjin Tang
The fabrication of highly loaded and uniformly dispersed metal oxide nanoparticles (NPs) is much desired but still remains a great challenge. Herein, the NiO NPs exclusively confined in mesoporous silica SBA-15 were obtained by using nickel nitrate hydrate as a precursor through a facile solvent-free preparation method, which comprised manual grinding of Ni(NO3)2·6H2O with SBA-15 and subsequent air calcination. Characterization results from X-ray diffraction (XRD) and transmission electron microscope (TEM) revealed that aggregation-free NiO nanoparticles with sizes of 3–5 nm were obtained at loading as high as 20wt.% (weight%). Further increasing the NiO loading to 30wt.% led to partial agglomeration of discrete nanoparticles to rod-like particles, while no external particles were observed. By comparing the sample derived from nickel acetate with exclusively external NiO particles, it was established that the pore confinement provided NiO nanoparticles with high thermal stability. Lastly, the catalytic performance of the prepared sample was evaluated in the model reaction of ammonia decomposition to COx-free H2, and the stable NH3conversion of 93.7% was achieved at the weight hourly space velocity (WHSV) value of 30,000 mL·g−1·h−1and at high temperature of 650 °C for 60 h, demonstrating the great potential of the solvent-free method in preparing thermally stable and robust supported catalysts.
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ChemistrySelect
·
2023
·Vol. 8
·期 16
·e202300902
·
IF 2.1
Panli Liu,Shengbin Shi,Ruiping Wei,Lijing Gao,Jin Zhang,Guomin Xiao
Graphical P-Zr-SBA-15 catalyst with bifunctional acidity was synthesized by introducing Zr 4+ into the mesoporous material SBA-15 structure for intra skeleton modification, and then impregnated with phosphoric acid solution to modify the outer skeleton. The catalyst exhibits excellent catalytic activity, good thermal stability, and recoverability in the preparation of furfural. A series of bifunctional P-Zr-SBA-15 catalysts with Lewis acid and Brønsted acid sites were prepared by modifying mesoporous material SBA-15 with Zr 4+ and phosphate group, which were used in the conversion of xylose and xylan into furfural. The structure and acidic characteristics of the catalyst were analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, N 2 adsorption desorption, scanning/transmission electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, NH 3 temperature programmed desorption, and pyridine adsorption infrared spectroscopy. The effects of different process parameters on the catalytic performance of the catalyst were studied. when using the xylose and xylan as substrates, the furfural yield were 80.3 % and 68.8 % under the optimal conditions in the H 2 O (NaCl) /toluene (3/3 mL) biphasic solvent system, respectively, and 52.5 % furfural yield was obtained using xylose as substrate in aqueous system. In addition, the catalyst has good thermal stability and easy recovery in the recycling experiment.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 44
·e54613
·
IF 3
Hong Zhang,Xin Zhang,Shanpeng Qiao,Bo Wang,Xu Zeng,Bo Ren,Xiaodong Yang
SBA-15 is successfully incorporated into a composite superabsorbent hydrogel polymer (SAHP) by in situ graft polymerization of acrylic acid (AA) on a carboxymethyl cellulose (CMC) backbone using SBA-15 as a filler. The structure and properties of the SAHPs are studied in detail by means of a variety of characterization methods, including Fourier transform infrared spectroscopy, X-ray diffraction, and field emission scanning electron microscopy. And the effects of the originating mate-rials (such as SBA-15, initiator, cross-linker, ratio of CMC to AA, and neutralization of AA) and pH on the water absorption properties are discussed. The obtained results show that the introduction of SBA-15 have significant effect on the intrinsic structure of the superabsorbent. Importantly, the composite SAHP exhibit higher thermal stability and significant swelling as well as water retention capacity. The prepared SAHP show good sensitivity to various surfactant solutions, which not only have water retention applications in agriculture but also show potential applications in the field of biomaterials.
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 1
·175-182
·
IF 2.523
Liu Jing-Long,Dong Xian-Ping,Jia Ai-Quan,Xin Zhifeng,Zhang Qian-Feng
A series of amorphous RuS 2 and SBA-15 supported RuS 2 materials were prepared by solvothermal method using corresponding tris-dialkyldithiocarbamato ruthenium(III) complexes as precursors. The structures of the catalystline precursors Ru(S 2 CNR 2 ) 3 (R = Me, Et, i Pr), unsupported and supported amorphous RuS 2 -R materials as well as nanocrystalline RuS 2 were characterized and analyzed by IR, powder X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), transmission electron microscope (TEM), N 2 sorption measurement, and temperature-programmed reduction (TPR). Powder X-ray diffraction patterns indicated the transformation of amorphous phase RuS 2 to crystalline RuS 2 with the heating treatment at 400 °C. The catalytic activity of RuS 2 -R/SBA-15 for thiophene hydrodesulfurization (HDS) was also investigated.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Chenshi Shang,Yingxi Liu,Xiangrui Zeng,Wan Jie Luo,Lulu Wang,Jilin Wang
In this paper, self-made diformyl-dibenzo-18-crown-6 ether (DDB 18 C 6 ) is in-situ grafted into the pores of mesoporous molecular sieve (SBA-NH 2 ), and then the aforementioned modified molecular sieve (SBA-C) is introduced into the polyvinyl alcohol solution, and then the glutaraldehyde as the crosslinking agent to synthesized the anion exchange membrane under for fuel cell application . During the experiment, a series of anion exchange membranes (P-(SBA x% -C), x is the mass fraction of SBA-NH 2 ) is developed and the pore channels and chemical structures of the aforementioned membrane is verified by FT-IR, SAXD , N 2 adsorption-desorption, 1 H NMR and XPS . Moreover, the performance of the membrane synthesized in this paper is also investigated and the results revealed that the unique membrane internal structure can improve the OH − transportation efficiency. Furthermore, the ionic conductivity of P-(SBA 10% -C) membrane is the highest (0.107S·cm −1 ) and the power density is the highest (354.8 mW cm −2 ) at 80 °C. By immersing P-(SBA 10% -C) membrane in 6 mol L −1 KOH solution for 168 h, the conductivity at 80 °C only decreased by 2%, proving that P-(SBA 10% -C) has a higher conductivity, good single cell performance and alkali stability.
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ChemCatChem
·
2020
·Vol. 12
·期 21
·5504-5510
·
IF 4.853
Zi-Cheng Fu,Joshua T. Moore,Zi-Xin Yang,Jia-Jun Hu,Wen-Fu Fu
Graphical CoP for photocatalysis : Sphericalmesoporous SBA-15-supported CoP nanoparticlecatalysts tuning the highly efficient photocatalytic CO-and H 2 -generating pathways with product selectivity of up to 76.3 %and 99.9 % through switching solvent, respectively, were in situ fabricated by CoP embedded on the surface and interior of the porous s-SBA-15. The highly active spherical hybrid catalysts with diameters of 3–8 μm for robust selective CO 2 photoreduction and hydrogen production by switching solvent, CoP/(i)s-SBA-15 and CoP/(o)s-SBA-15, were in situ synthesized for the first time by incorporating CoP nanoparticles on the interior and outside of the spherical mesoporous Santa Barbara Amorphous (s-SBA)-type material s-SBA-15. CoP/(i)s-SBA-15 has a larger pore diameter of ∼9.5 nm, relative to ∼5.7 nm of CoP/(o)s-SBA-15, and a calculated Brunauer-Emmett-Teller surface area of ∼214 m 2 g −1 compared with ∼336 m 2 g −1 for the latter. In comparison with bare CoP, the composites exhibited excellent catalytic CO- and H 2 -generating performance with product selectivity of up to 76.3 % and 99.9 % through switching solvents containing Ru-based photosensitizer under ambient conditions, respectively. The influences of various solvents and electron donors, as well as the amounts of H 2 O, and catalyst on reaction kinetics for CO 2 reduction and H 2 production, and intrinsic properties of both catalysts were investigated and compared.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Dongli Li,Kungang Chai,Xingdong Yao,Liqin Zhou,Kongyou Wu,Zhenghui Huang,Juntao Yan,Xingzhen Qin,Wei Wei,Hongbing Ji
To remove the bulky aqueous organic dye e.g. methyl blue (MB) from water, ordered mesoporous silica SBA-15 has been functionalized with β-cyclodextrin (β-CD) via amide linkage. The surface physical and chemical properties of the surface of the resulted β-CD-functionalized adsorbents (abbrev. SBA15-A-CD) were characterized systematically. The results indicate that the channels of SBA-15 were uniformly modified with amine groups and were further β-CD-terminated via amide linkages, without ruining its ordered mesoporous structure. The effects of contact time, pH, ionic strength, temperature and salt on the adsorption performance were explored. SBA15-A-CD showed maximum adsorption capacity for MB up to 1791 mg·g −1 combined with excellent recyclability. Besides, the adsorption behavior of MB onto SBA15-A-CD has been investigated by DFT calculation and two-dimensional NMR. Specifically, the enhanced adsorption capacity for MB stems from the tailored host–guest interaction between β-CD cavity and aromatic moiety of MB in combination with the electrostatic attraction between amine groups and sulfonated group of MB. These findings offer good opportunities for improving the ability of mesoporous silica in adsorption of bulky anion dyes in wastewater.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 9
·6853-6866
·
IF 3.442
Jin Manman,Guo Zhenmei,Lv Zhiguo
An efficient hybrid mesoporous heterogeneous catalyst system was synthesized via covalently grafting tungsten chelate complex W- N , N ( N , N = (3-triethoxysilylpropyl) [3-(2-pyridyl)-1-pyrazolyl] acetamide, N,N -chelating ligand) in organic moieties (diphenyldichlorosilane, DPHS)-functionalized mesoporous silica SBA-15 or pure SBA-15. Characterization of synthesized materials via N 2 sorption, XRD, TEM, UV–Vis DRS, 29 Si MAS NMR, element analysis, and FT-IR indicated that W- N , N was successfully anchored and highly dispersed in the mesochannels of SBA-15 and the mesostructure of SBA-15 was maintained during the grafting course. The synthesized hybrid catalysts were highly active and authentically heterogeneous in triphasic oxidation reaction of cyclopentene (CPE) with H 2 O 2 . W, N - N immobilized on functionalized SBA-15 with DPHS moieties (W- N , N -DPHS-SBA-15) showed better catalytic properties (activity and stability) than its unmodified counterpart W- N , N -SBA-15 catalyst. Besides, possible catalytic reaction route for CPE oxidation with H 2 O 2 over W- N , N -DPHS-SBA-15 catalyst was proposed. The amphiphilic mesochannels of W- N , N -DPHS-SBA-15 provided suitable accommodation for both hydrophilic H 2 O 2 and hydrophobic CPE molecules and acted as nanoreactors for CPE/H 2 O 2 /solid triphase reaction.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Siquan Xu,Donghui Pan,Yuanfeng Wu,Jingdeng Fan,Ningxin Wu,Lijing Gao,Wenqi Li,Guomin Xiao
The mesoporous SBA-15 has long been used as an adsorbent for the removal of toxic metal ions. Achieving secondary utilize of spent adsorbent is undoubtedly an advisible option for environmental protection and recycling economy. In the present study, phosphoric acid-modified SBA-15 (P-SBA-15) was found to be an available adsorbent, and the composites (Cr3+/P-SBA-15) formed after adsorption of Cr3+ ions have the ability to efficiently catalyze the conversion of xylose and xylan into furfural. The physicochemical properties of the Cr3+/P-SBA-15 composites were characterized, and the effects of various reaction parameters on their catalytic performance were also investigated. Among the Cr3+/P-SBA-15 composites with different Cr3+ contents, the (0.25)Cr3+/P-SBA-15 composite not only achieved excellent 91% and 58% furfural yields from xylose and xylan, but also had almost constant catalytic performance after five cycles. The findings herein provided a reference for achieving high yields of furfural and reuse of spent adsorbents.
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RSC Advances
·
2019
·Vol. 9
·期 24
·13476-13485
·
IF 3.049
Fan Zhang,Chuting Yang,Yi Li,Min Chen,Sheng Hu,Haiming Cheng
P,P-bis (2-oxooxazolidin-3-yl)-N-(3-(triethoxysilyl)propyl)phosphinic amide (APTES-BOP)-modified SBA-15 (SBA-15-BOP) was prepared by a post-synthesis grafting method for the removal of anionic azo dyes from aqueous solutions. The properties of the prepared adsorbent were characterized by PXRD, FT-IR, SEM, TEM, nitrogen sorption, and elemental analysis. Adsorption equilibrium and adsorption kinetic studies demonstrated that the experimental data fitted well with the Langmuir isotherm model and pseudo-second-order model. According to Langmuir fitting, SBA-15-BOP showed high adsorption capacity for CR and RR2 dyes, with the maximum adsorption capacities of 518.1 mg g−1 and 253.8 mg g−1, respectively. The thermodynamic study indicated that the adsorption processes of CR and RR2 dyes on SBA-15-BOP were spontaneous and exothermal. The prepared SBA-15-BOP can be a promising adsorbent for the removal of anionic dyes from aqueous solutions.
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Nanoscale
·
2018
·Vol. 10
·期 47
·22348-22356
·
IF 7.233
Xusheng Cheng,Dongxu Wang,Jiancong Liu,Xin Kang,Haijing Yan,Aiping Wu,Ying Gu,Chungui Tian,Honggang Fu
Decreasing Pd usage whilst maintaining a superior performance is promising, but remains a challenge in the catalytic field. Herein, we have demonstrated the highly efficient promotion of Mo2N with a reduced amount of Pd for the liquid-phase hydrogenation reaction. The Mo2N (2–3 nm) was uniformly anchored onto mesoporous SBA-15 by using PMo12 as the Mo source. The small size and good dispersion of Mo2N is favourable for allowing their effective contact with post-loading Pd. This good contact is conducive to developing a synergistic catalyst, which was verified by studying the liquid-phase hydrogenation of p-nitrophenol (PNP) to p-aminophenol (PAP) with NaBH4 as the H source. The conversion ability of PNP to PAP on 1 wt% Pd–Mo2N/SBA-15 was vastly superior to 1 wt% Pd/SBA-15 and even better than 20 wt% Pd/SBA-15. The low-Pd, highly efficient catalysis is ascribed to the transfer of the electrons from Mo2N to Pd for the easy activation of H. The synergy can be affected by the type of support used. SBA-15 is superior to SiO2 and the other supports, which could be related to the large surface area and the plentiful number of pores on SBA-15, which is favourable to the dispersion of Pd and Mo2N, and the transfer/diffusion of the reactants. In particular, a highly efficient catalyst can be achieved at an even more reduced Pd loading (0.05 wt%). The current method describes the design of a highly efficient catalyst for the hydrogenation reaction using low amounts of noble metals.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Yan Zhao,Bing Yan
GaN-functionalized rare earth (Eu 3+ and Tb 3+ ) organic/inorganic mesoporous nanocomposites have been successfully synthesized (designated as RE(L SBA-15) 3 (L GaN); RE = Eu, Tb; L = TAA Si, BTA Si). The organosilane precursor materials (L SBA-15) are synthesized by co-condensation of tetraethylorthosilicate (TEOS) and the functionalized β-diketones (TAA Si and BTA Si) in the presence of Pluronic P123 surfactant as a template. The modified β-diketones ligands are also used to covalently bond with surface-modified GaN and formed another precursor L GaN. Both of the precursors can coordinate with rare earth ions to synthesize the final mesoporous materials via a sol–gel process. FTIR, TEM, XRD, and nitrogen (N 2 ) adsorption/desorption measurements are employed to characterize the mesostructure of RE(L SBA-15) 3 (L GaN). The luminescence properties and thermogravimetric analysis of all the prepared materials are characterized in detail, and the results reveal that a series of uniformed mesopore structure hybrid materials has been achieved. The mesoporous material Eu(BTA Si SBA-15) 3 (BTA Si GaN) has better luminescence intensity, higher quantum efficiency, and longer lifetime than Eu(TAA Si SBA-15) 3 (TAA Si GaN). While the nanocomposite Tb(TAA Si SBA-15) 3 (TAA Si GaN) revealed the strongest characteristic emission of Tb 3+ ions than Tb(BTA Si SBA-15) 3 (BTA Si GaN), the excellent luminescent properties and thermal stability enable the hybrid mesoporous material to have potential applications in optical field.
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