RSC Advances
·
2016
·Vol. 6
·期 52
·46908-46914
·
IF 3.289
Lixin Xu,Bo Jin,Jian Zhang,Dang-guo Cheng,Fengqiu Chen,Yue An,Ping Cui,Chao Wan
Bimetallic AgPd nanoparticles were successfully immobilized on graphitic carbon nitride (g-C3N4) functionalized SBA-15 for the first time by a facile co-reduction method. These catalysts were applied in the decomposition of formic acid. The dehydrogenation of formic acid is dependent on the composition of AgPd and the content of carbon nitride (CN). Among all of the AgPd/mCND/SBA-15 catalysts tested, the Ag10Pd90/0.2CND/SBA-15 catalyst exhibits highly superior performance for the decomposition of formic acid into high-quality hydrogen at 323 K with 100% hydrogen selectivity and a turnover frequency of 893 h−1, which is among the maximum values obtained at 323 K in this paper. The improved performance is a promising step towards the utilization of formic acid as a hydrogen storage material.
研究领域:
材料科学
·
催化化学
·
能源化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ziheng Wei,Yongping Liu,Qi Ding,Yuena Zhang,Yu Ren,Jihu Chen,Mingming Si,Yuchi Fan,Wan Jiang
Conductive two-dimensional (2D) materials exhibit excellent electromagnetic wave (EMW) absorption properties at high frequencies due to their high conductivity loss. However, their unsatisfactory EMW absorption at low frequencies, attributed to impedance mismatch, remains a significant challenge. In this work, high-conductivity 1T′ WTe 2 nanosheets were incorporated into insulating mesoporous channels of Santa Barbara Amorphous-15 (SBA-15) via chemical vapor deposition (CVD), resulting in the formation of 1T′ WTe 2 /SBA-15 composites. These mesoporous channels restrict the growth of 1T′ WTe 2 and hinder carrier migration cross the channels, reducing their conductivity. Meanwhile, heterogeneous interfaces were formed between 1T′ WTe 2 nanosheets and mesoporous channels of SBA-15, accompanied by defects within the 1T′ WTe 2 nanosheets. This interaction promotes dipole polarization losses, significantly enhancing the attenuation of incident EMW, particularly at low frequencies. Consequently, the effective absorption bandwidth (EAB) of 1T’ WTe 2 /SBA-15 composites within the S band reached to 0.72 GHz, ranging from 3.28 GHz to 4.0 GHz, with a minimum reflection loss (RL min ) of −26.5 dB at 3.68 GHz. Furthermore, the EAB of the composites extended to 3.92 GHz at 1.5 mm in the high-frequency range. This work introduces a novel strategy for enhancing EMW absorption performance in the S band through heterogeneous interfaces and defect engineering, driven by the limiting effects of mesoporous channels.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4230
·
IF 4.2
Yan Gao,Shuai Huang,Nina Han,Jianshe Zhao
In this work, a novel heterogeneous catalyst consisting of peroxophosphotungstate, microporous MOF-808, and mesoporous SBA-15 was synthesized, characterized, and used to remove sulfides from model fuel. The prepared material, PW4@MOF-808@SBA-15, exhibits excellent catalytic activity with a desulfurization efficiency of 99.8% in 60 min for multicomponent simulated fuel, and the desulfurization rate can reach more than 90% after ten consecutive cycles. The excellent catalytic activity and reusability are attributed to the hierarchically porous hybrid material MOF-808@SBA-15, which can effectively encapsulate PW4and provide a site for the oxidation of sulfides.
研究领域:
化学工程
·
催化材料科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2018
·Vol. 8
·期 5
·200
·
IF 3.465
Shiying Han,Yunfei Liu,Jiang Li,Rui Li,Fulong Yuan,Yujun Zhu
A series of Pd-Ni bimetallic catalysts supported on SBA-15 (0.2%Pd-x%Ni/SBA-15, x = 0.4, 0.7, and 1.2) were prepared through the impregnation method combined with the NaBH4reduction method. X-ray diffraction (XRD), N2adsorption-desorption, X-ray photoemission spectroscopy (XPS) and transmission electron microscope (TEM) were used to characterize the prepared catalysts. All the synthesized catalysts were evaluated for the liquid-phase hydrogenation of cinnamaldehyde (CAL). The addition of Ni obviously enhanced the CAL conversion and selectivity of C=C hydrogenation to hydrocinnamaldehyde (HALD) over the 0.2%Pd-x%Ni/SBA-15 catalysts. Meanwhile, 0.2%Pd-1.2%Ni/SBA-15 showed the best performance with 96.3% conversion and 87.8% selectivity toward HALD. This improvement was attributed to the synergistic effect between the Pd and Ni nanoparticles, enhancing the dispersion of Pd metal particles and increasing the content of surface Pd0species. In addition, the influences of a few reaction factors including H2pressure, reaction temperature, and reaction time were studied over 0.2%Pd-1.2%Ni/SBA-15.Keywords:selective hydrogenation;cinnamaldehyde;hydrocinnamaldehyde;synergistic effect;Pd-Ni/SBA-15
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xudong Zheng,Zhiqiang Song,Enxiu Liu,Yuzhe Zhang,Zhongyu Li
Phosphoric acid-functionalized mesoporous silica material was prepared by copolycondensation using P123 as the soft template and diethylphosphatoethyltriethoxysilane as the functional monomer. It was used for highly efficient selective adsorption and separation of La(III). By adjusting the ratio of the silicon source to functional monomer, the difference of the adsorption material structure and the change of adsorption performance were explored. When the ratio of the silicon source to functional monomer is 9/1, the phosphoric acid-functionalized SBA-15 (named S2) exhibits a highly ordered hexagonal cell structure. Saturated adsorption capacity of La(III) on S2 is 114.81 mg g–1 at 25 °C and 7.0 pH, which is much larger than other reported adsorbents. In addition, the adsorbent S2 has excellent adsorption kinetics: the adsorption equilibrium can be quickly concluded within 60 min. The distribution coefficient (Kd) of S2 to La(III) is 725 mL g–1, and that of Nd(III) and other ions is about 200 mL g–1. This indicates that the phosphoric acid-functionalized adsorbent has strong selectivity in the process of adsorption and separation of La(III). Cyclic performance tests indicate that the adsorbent has excellent regenerability. The above results indicate that the phosphoric acid-functionalized SBA-15 adsorbent (S2) has a promising application in the actual adsorption separation of La(III).
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2014
·Vol. 61
·期 1
·166-176
·
IF 2.581
Xue-jing Yang,Peng-fei Tian,Xiao-man Zhang,Xin Yu,Ting Wu,Jing Xu,Yi-fan Han
Iron oxychloride (FeOCl) supported on mesoporous silica (SBA-15), as a Fenton-like solid catalyst for phenol degradation, showed supreme activity for production of hydroxyl radical (HO·) by H 2 O 2 decomposition, and the generation capacity was comparable to the conventional Fenton reagent (Fe 2+ +H 2 O 2 ). The structure of FeOCl was characterized with spectroscopies. The generation of HO· species during the reaction was detected using 5,5-dimethyl-1-pyrroline N-oxide trapped electron paramagnetic resonance. Furthermore, the kinetics in detail was driven for the creation and diffusion of HO· by H 2 O 2 decomposition over FeOCl, which follows a first-order rate through a two-step reaction. With the combination of the catalyst structure and kinetic parameters, the plausible mechanism for H 2 O 2 decomposition during the oxidative degradation of phenol was rationalized. As a Fenton-like solid catalyst, FeOCl/SBA-15 is a promising alternative for the removal of low-level organic contaminates from water. © 2014 American Institute of Chemical Engineers AIChE J , 61: 166–176, 2015
研究领域:
环境科学
·
催化化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Tong Song,Peng Zhang,Chao Zhang,Liliang Gong,Xingzhong Cao,Baoyi Wang,Runsheng Yu,Wei Zhou
Pore structure of Polyethyleneimine (PEI)/SBA-15 nanocomposites was investigated by Positron Annihilation Lifetime Spectroscopy (PALS) in conjunction with other conventional means like TEM , XRD and N 2 adsorption and desorption techniques. In this study, PALS could help us obtain the information of micropores and mesopores in the SBA-15 matrix at same time via analyzing the change of long lifetime components τ 3 and τ 4 . The size of micropores and mesopores could be obtained based on theoretical models, which is slightly smaller than the mesopore size obtained by N 2 adsorption and desorption techniques due to the existence of open micropores in the channel. This provides unique tool for understanding the evolution of the nanometer-sized pores in SBA-15 and PEI/SBA-15 composites and quantitative description of the relationship between the materials structure and its CO 2 adsorption capacity in the future.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Yulin Zhang,Guozhao Ji,Aimin Li
The goal of producing limonene epoxide and separating p -cymene from tire pyrolysis oil (TPO) could be achieved after epoxidation . However, the existing catalytic epoxidation process has the problem of cumbersome catalyst separation process, which is not conducive to industrial applications. In this work, the heterogeneous catalysts polyoxometalate-SBA-15 were prepared with the point of simplifying separation process. Heteropoly acid anions (phosphotungstic acid or peroxophosphotungstic acid) with catalytic active successfully enter the mesoporous pores of SBA-15, exhibiting high limonene conversion in the TPO system. The PW 4 species produced by phosphotungstic acid after oxidation of H 2 O 2 was favorable for improving the selectivity of epoxidation. The catalyst S- D -PW 4 prepared showed high catalytic activity and epoxidation selectivity with the condition of H 2 O 2 as an oxidant and free of solvent. Furthermore, A statistical experimental approach was used to comprehensively evaluate the reaction conditions. The conversion of limonene in TPO could reach 99.78%, and the yield of 1,2-limonene epoxide and diepoxide were 67.96% and 20.16%, respectively. A variety of characterization techniques such as 31 P NMR, XPS, and ICP were employed to analyze the difference in catalyst before and after epoxidation. S- D -PW 4 could be easily separated and the catalytic activity and epoxidation selectivity remained high after 5 cycles.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Zijie Shi,Qian Su,Ting Ying,Xin Tan,Lili Deng,Li Dong,Weiguo Cheng
Synthesis of cyclic carbonates via cycloaddition reaction by means of CO 2 and epoxides has been thought as an effective method for relieving global warming together with resource shortage. In order to elevate the utilization ratio of ionic liquids and separate catalysts easily after reaction, multi-site ionic liquids were designed and then immobilized on SBA-15 for the conversion of CO 2 into cyclic carbonates. By combining the advantages of multiple sites and mesoporous channel, in this work, a certain amount of ionic liquids with multiple active sites were firmly immobilized on modified SBA-15. Among all the immobilized ionic liquids, [IMCA] 2 Br 2 @SBA-15 presented the best catalytic activity. The result showed high yield (97.4 %) and almost 100 % selectivity of propylene carbonate, which was close to equivalent molar bulk ionic liquids. This superiority could be attributed to the sufficient dispersion of multiple active sites of ionic liquids after being immobilized, enabling efficient use of ionic liquids. Furthermore, the catalyst showed good recyclability after five cycles. By characterization and DFT calculation, the synergistically catalytic mechanism based on multiple sites was proposed.
研究领域:
化学工程
·
催化化学
·
环境科学
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Phyu Thin Wai,Pingping Jiang,Yirui Shen,Pingbo Zhang,Qian Gu
The efficient catalysts were designed to allow the entry and release of reactants and products into the mesoporous SBA-15 in which the active sites, peroxophosphotungstate, were entrapped by silylation with three different silylating agents (C 3 , C 5 , and C 8 arm). The as-prepared catalysts were characterized by elemental analysis, ICP analysis, TGA, XRD, N 2 adsorption/desorption, SEM, TEM, and FT-IR spectra. Their catalytic performances were tested for the epoxidation of soybean oil using different parameters such as temperature, H 2 O 2 to unsaturation molar ratio, catalyst loading and stirring speed. The resulting epoxidized soybean oil was analyzed qualitatively and quantitatively by FT-IR and 1 HNMR. The results confirmed that the catalyst silylated with C 8 arm is promising for the synthesis of epoxides of long-chain carbon and reusable at least three times without obvious decrease in activity. Moreover, use of H 2 O 2 oxidant and free of solvent in the epoxidation reaction are the main advantages of these catalysts.
研究领域:
催化化学
·
材料科学
·
绿色化学
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DOI
高影响因子
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.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Yue Li,Nanjing Zhong,Ling-Zhi Cheong,Jianrong Huang,Hongxiao Chen,Shaoyan Lin
In this study, SBA-15 was modified by a series of silane coupling reagents and later used to immobilize Candida antartica lipase B (CALB). The enzymatic properties of the immobilized CALB samples were studied. In addition, the catalytic performance in glycerolysis of soybean oil for diacylglycerols (DAG) production was also investigated. The highest enzymatic activity up to 6100.00 ± 246.41 U/g was observed from the propyl methacrylate group modified SBA-15 supported CALB. No loss of activity was observed from the propyl methacrylate group modified SBA-15 supported CALB, but a higher-than-initial activity was notably found from 3-aminopropyl group and n -octyl group modified SBA-15 supported CALB after a 4-h incubation in air at 70 °C. 1-isocyanatopropane group modified SBA-15 supported CALB exhibited selectivity for DAG production. DAG content up to 61.90 ± 2.38 wt% and a DAG/MAG ratio at 3.11 ± 0.08 was obtained after a 24-h reaction at 60 °C in a solvent-free system.
研究领域:
生物化学
·
酶工程
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）