JOURNAL OF POROUS MATERIALS
·
2024
·
IF 2.5
Shi Xiang,Wang Ke,Wang Minxin,Yuan Hong
UiO-66 specimens having different acetic acid/ZrCl 4 molar ratios were prepared and pyrolyzed to ZrO 2 as supports for Pt and Ni, intended to catalyze the decarboxylation of oleic acid. Brunauer-Emmett-Teller surface area analyses, NH 3 temperature-programmed desorption and pyridine adsorption infrared spectroscopy showed that the material made using an acetic acid/ZrCl 4 molar ratio of 100 (ZrO 2 -100) had the largest specific surface area, acid amount and acid strength values. The yield of C 8 -C 17 alkanes obtained from Ni/ZrO 2 -100 exceeded that provided by Pt/ZrO 2 -100 because the latter possessed more acidic sites than the former, which excessively cracked long-chain hydrocarbons. The 1 wt% Ni/ZrO 2 -100 catalyst showed the best catalytic performance, with 96.4% conversion of oleic acid and an 80.6% yield of C 8 -C 17 alkanes after 4 h at 340 °C under a CO 2 atmosphere at a pressure of 18 bar. The conversion of oleic acid remained almost unchanged after 4 reuses of this catalyst whereas the yield of C 8 -C 17 alkanes decreased to 66.7%. This result is attributed to a loss of acidic sites and an increase in carbon build-up.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Biao Yuan,Pan Wu,Changjun Liu,Jian He,Wei Jiang
Arsenate As(V) and arsenite As(III), known for their high toxicity and carcinogenic potential, pose significant threats to environmental and soil health, an efficient arsenic removal technology is urgently needed. In this work, a novel class of zirconium-based adsorbent (AHZOs) was synthesized via the Sol-Gel method, exhibiting a unique nanostructured morphology with low crystallinity and a high density of active hydroxyl groups with a specific surface area of 216.4 m 2 /g. The AHZOs demonstrated remarkable adsorption capacities of 240.7 mg/g for As(III) and 230 mg/g for As(V), with removal efficiencies strongly influenced by pH value. Thermodynamic analysis revealed that the adsorption process was spontaneous and endothermic. Through comprehensive characterizations and theoretical calculations, the adsorption mechanisms were elucidated, revealing a combination of chemical reactions and hydrogen bonding interactions. This work not only presents a highly efficient adsorbent for arsenic removal but also provides a new design strategy for targeting other environmental pollutants, highlighting its significant potential for practical applications in environmental remediation.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Sujie Shan,Huan Tang,Ying Zhao,Wei Wang,Fuyi Cui
The decontamination of excessive phosphate by Zr-based nanomaterials has attracted great attention. However, the insufficient phosphate sorption capacities and separation difficulties significantly restrict the potential applications. Herein, the newly designed zirconium-crosslinked graphene oxide/alginate (Zr-GO/Alg) aerogel beads were synthesized through a facile in situ crosslinking method, and their phosphate uptake performance were examined in the aqueous environment under different conditions. Characterization results showed that the incorporation of GO endowed the composite beads with a more porous and reinforced structure. The maximum sorption capacity was 189.06 mg P/g and the isotherm data were well fitted to the Freundlich model. Fixed-bed column experiments showed a large throughput of ∼1050 BV, with phosphate concentration of effluents lower than 0.5 mg/L. Apart from the remarkable phosphate uptake performance, the fast adsorption rate at initial stage as well as easy separation feature of Zr-GO/Alg aerogel beads rendered them to become promising and environmental-friendly adsorbentfor phosphate uptake from polluted water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Guoqin Wang,Gangli Zhu,Yong Ding,Chungu Xia,Zhen Li
Polyoxymethylene dialkyl ethers, which can be blended into diesel fuels, have attracted increasing attentions due to their advantages for fuel additives. It can utilize bioethanol and biomass syngas, helping to achieve the carbon neutral target earlier. Polyoxymethylene diethyl ethers (PODEE n ) synthesis requires efficient catalysts with high performance. In this work, the mesoporous acidic functional N-containing ZrN x O y catalysts were prepared with a Sol-Gel assisted solvothermal method. The acid nature and strength, morphology, crystalline structure and pore distribution of catalysts were characterized by fourier transform infrared (FT-IR) spectroscopy, pyridine-adsorption infrared spectra (Py-IR), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), N 2 adsorption-desorption isotherm, X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of ammonia (NH 3 -TPD) etc, showing catalyst possessing crystalline-amorphous mixed domains with smaller defective tetragonal nanoparticles and mesopores . The catalysts were applied in PODEE n synthesis, showing excellent activity and selectivity under mild conditions. And the high trioxane (TOX) conversion of 93 % and excellent PODEE 2−8 selectivity of 98 % can be achieved at 80 °C under atmospheric pressure owning to the superior properties.
研究领域:
催化化学
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能源化学
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材料科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 36
·2302357
·
IF 13.3
Zhilin Li,Mengyan Cao,Zhihui Rao,Xiujian Zhao,Xiao Gong
Low-dimensional hybrid metal halide (LDHMH) materials have attracted considerable attention owing to their intriguing optical properties. To the best of the knowledge, this is the first study to successfully demonstrate both self-trap exciton (STE) and afterglow emissions in Zr-based LDHMH materials. The obtained pure (Ph 3 S) 2 ZrCl 6 crystals showed near-ultraviolet phosphorescence and a green afterglow owing to the organic cation Ph 3 S + , while the Bi-doped and Sb-doped crystals exhibited both STE and afterglow emissions. However, the Te-doped crystals showed only a broad yellow STE emission owing to the [TeCl 6 ] 2− octahedron. In addition, all the crystals showed good stability. Notably, Sb-doped crystals produced white light, which can be adjusted between cold white and warm white using different excitations. Finally, this strategy for both STE and afterglow emissions can be applied to other LDHMH materials for optical applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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