CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Min-Ping Zhu,Jia-Cheng E. Yang,Xiaoguang Duan,Shaobin Wang,Darren Delai Sun,Baoling Yuan,Ming-Lai Fu
Immobilizing metal-organic frameworks in macro-supports to form three-dimensional catalysts holds a great promise in environmental remediation, however quantitative structure/property-catalytic activity relationship remains unknown currently. In this work, we constructed Co 2 AlO 4 /CoAl 2 O 4 @Al 2 O 3 monoliths derived from ZIF-67@γ-Al 2 O 3 pellets and systematically investigated their surface chemistry-activity relationships in peroxymonosulfate (PMS) activation for organic degradation. The activities of Co 2 AlO 4 /CoAl 2 O 4 @Al 2 O 3 catalysts were selectively correlated with their ratios of Co 3+ /Co 2+ and O Defect /O Lattice . The optimized Co 2 AlO 4 /CoAl 2 O 4 @Al 2 O 3 demonstrated an excellent catalytic efficacy toward PMS activation for metronidazole removal in a wide pH range (3.29–10.26) and OH was the dominant oxidant for metronidazole oxidation. The catalyst also exhibited desirable performance for eliminating other emerging contaminants and enduring catalytic activity and stability in PMS activation without regeneration. This study provides new prospects in rational design of robust, cost-effective and self-cleaning/repairing three-dimensional Co-based macroscale-catalysts with an outstanding and lasting catalytic activity for water purification.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Zhichang Bao,Lei Yang,Zhenmin Cheng,Zhiming Zhou
A non-noble NiZn3/α-Al2O3 catalyst was prepared by a urea co-precipitation method, which showed good stability and high selectivity to styrene (ST) (92% selectivity at above 99% conversion of phenylacetylene (PA)). The high selectivity was mainly attributed to the electronic effect of the Ni–Zn alloy. The selective hydrogenation of the C8 aromatic fraction on NiZn3/α-Al2O3 was well described by a Langmuir–Hinshelwood-type kinetic model. The estimated activation energies for the hydrogenation reactions of PA → ST, ST → ethylbenzene (EB), and PA → EB were 70.31, 81.65, and 74.88 kJ/mol, respectively. A reactor model allowing for an intraparticle diffusion-reaction and external mass transfer was further developed to describe the selective hydrogenation of the C8 aromatic fraction on larger NiZn3/α-Al2O3 particles in a fixed-bed reactor. The observed changes in product composition with the reaction conditions were well predicted by the model, and the results demonstrated that phenylacetylene can be completely removed without loss of styrene under certain conditions.
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高影响因子
Journal of Energy Storage
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2021
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IF 6.583
Bo Zhao,Yuchen Wang,Chongbo Wang,Ruijie Zhu,Nan Sheng,Chunyu Zhu,Zhonghao Rao
The utilization of paraffin in latent heat storage system is limited by its leakage and low thermal conductivity . To address such challenges, we prepare composite phase change materials (PCMs) with enhanced thermal conductivity and shape stability. Paraffin is supported by porous Al 2 O 3 which is synthesized by solution combustion synthesis (SCS). The porous structure of Al 2 O 3 is quite influenced by the fuel species in SCS reactions. The glycine-induced Al 2 O 3 shows highly hierarchical porous structure, which can improve the anti-leakage performance of the composites. The thermal conductivity of Al 2 O 3 /PW reaches 1.27 W/m•K with an Al 2 O 3 mass ratio of 50 wt%, which is 5 times of pure paraffin. The composite also presents acceptable latent heat capacity of higher than 100 J/g and very good thermal cycling stability. These characteristics assure the promising application of Al 2 O 3 /PW composites for thermal energy storage.
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高影响因子
RSC Advances
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2021
·Vol. 11
·期 39
·24144-24155
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IF 3.361
Xingdong Yang,Jiyan Qu,Linxi Wang,Jianhong Luo
In an attempt to realize the efficient treatment of NOx, a mixed catalyst of Ti3+ self-doped TiO2−x and γ-Al2O3 was constructed by reducing commercial TiO2. The degradation effect on NOx was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO2−x could achieve considerable degradation effects (84.84%, SIE = 401.27 J L−1) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO2 (73.99%) or a single plasma degradation process (26.00%). The presence of Ti3+ and oxygen vacancies in TiO2−x resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NOx to NO2− and NO3− during the plasma-induced “pseudo-photocatalysis” process. Meanwhile, the TiO2−x showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO2−x could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti3+ self-doped TiO2−x with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NOx.
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PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2021
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IF 2.495
Zhiyuan Wang,Hairu Xiang,Jiawen Zou,Zenghui Mai,Zhenzhen Cao,Mingliang Li,Bingbing Fan,Gang Shao,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
Spherical α-Al 2 O 3 particles with the size of 1–2 μm were obtained by microwave hydrothermal(M-H) method and subsequent microwave calcination. In the synthesis, Al 2 (SO 4 ) 3 ·18H 2 O was used as the aluminum sources, and CH 4 N 2 O was used as the precipitant. The effects of M-H temperature, heating preservation time and pressure in the reactor on the morphology, phase composition, particle size and surface area of the particles were studied. The results show that amorphous precursors with high sphericity and good dispersion can be rapidly (30 min) produced by M-H method at low temperature (100 °C). Increasing the temperature or extending the holding time will destroy the spherical morphology of the precursor, while transforming its phase from amorphous to γ-AlOOH. Pressure in the reactor does not change the phase composition of the precursor, but affects its dispersion and homogeneity. The precursor retains its spherical morphology after microwave calcination at 1100 °C for 90 min. The resulting powders were hot pressed and sintered at 1650 °C for 30 min to obtain a high-performance ceramic plate with a thermal conductivity of 27.1 W/(m·K) and a Vickers hardness of 21.4 GPa.
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高影响因子
Journal of Energy Storage
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2019
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IF 3.517
Shengqin Gong,Xiaomin Cheng,Yuanyuan Li,Dawei Shi,Xiuli Wang,Hao Zhong
The porous Al 2 O 3 ceramic foam was composited with expanded graphite (EG) by calcination method to obtain Al 2 O 3 @EG composite with hierarchical pores. The specific surface area of Al 2 O 3 @EG composite was 2.3 times that of EG , which can better enhance the thermal conductivity and heat transfer performance of phase change materials (PCMs). The stable composite PCMs with high thermal conductivity and energy storage density were prepared via vacuum adsorbing 1-octadecanol (OD) in Al 2 O 3 @EG. The thermal conductivity of the modified OD containing 10 wt% Al 2 O 3 @EG was 4.5 times that of pure OD, while maintaining a high phase change enthalpy, approximately 200 kJ/kg. The results of SEM and EDS indicated that Al 2 O 3 foam particles dispersed equably on the surface of EG without obvious agglomeration. The XRD and FTIR results revealed that OD, Al 2 O 3 and EG were physically combined. The prepared OD/Al 2 O 3 @EG composite PCMs with high thermal conductivity and large energy storage density can be promising for low temperature heat storage, such as industrial heat recovery system, comfort applications in buildings and textiles, solar energy system, etc. This study provides an innovative idea for the application of porous ceramic foams in the field of solar energy storage PCMs modification.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Hongcai Su,Ekkachai Kanchanatip,Defeng Wang,Haidan Zhang,Antoni,Ishrat Mubeen,Zhicheng Huang,Mi Yan
Ni/Al 2 O 3 catalyst is the one of promising catalysts for enhancing H 2 production from supercritical water gasification (SCWG) of biomass. However, due to carbon deposition , the deactivation of Ni/Al 2 O 3 catalyst is still a serious issue. In this work, the effects of lanthanum (La) as promoter on the properties and catalytic performance of Ni/Al 2 O 3 in SCWG of food waste were investigated. La promoted Ni/Al 2 O 3 catalysts with different La loading content (3–15 wt%) were prepared via impregnation method. The catalysts were characterized using XRD , SEM, BET techniques. The SCWG experiments were carried out in a Hastelloy batch reactor in the operating temperature range of 420–480 °C, and evaluated based on H 2 production. The stability of the catalysts was assessed by the amount of carbon deposition on catalyst surface and their catalytic activity after reuse cycles. The results showed that 9 wt% La promoter is the optimal loading as Ni/9La–Al 2 O 3 catalyst performed best performance with the highest H 2 yield of 8.03 mol/kg, and H 2 mole fraction of 42.46% at 480 °C. La promoted Ni/Al 2 O 3 catalysts have better anti-carbon deposition properties than bare Ni/Al 2 O 3 catalyst, resulting in better gasification efficiency after reuse cycles. Ni/9La–Al 2 O 3 catalyst showed high catalytic activity in SCWG of food waste and had good stability as it was still active for enhancing H 2 production when used in SCWG for the third time, which indicated that La promoted Ni/Al 2 O 3 catalysts are potential additive to improve the SCWG of food waste.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Haifeng Li,Sheng Su,Yan Peng,Linkang Wu,Kai Xu,Lijun Liu,Mengxia Qing,Song Hu,Yi Wang,Jun Xiang
High temperature sorbents for removing H2S comprising manganese oxide and Al2O3 support modified with La loadings were prepared with wet impregnation. The removal of H2S and the regeneration of sorbents were conducted at 850 °C to investigate the effect of the support modified with La on the desulfurization ability and durability of the Mn/La/Al2O3 sorbents. The fresh sorbent, first sulfide sorbent, and fourth regenerated sorbent were characterized by nitrogen isothermal adsorption, X-ray power diffraction, scanning electron microscopy, and H2 temperature-programmed reduction. The results showed that the highest initial breakthrough sulfur capacity (BSC) was obtained with Mn/0.78%La/Al2O3(M/0.78L), and the initial BSC decreased with increased La loadings due to the inhibiting of excessive La on the reaction between MnO and H2S. The BSC of sorbents with lower La loadings suffered more serious deactivation than MnxOy/Al2O3 during successive desulfurization–regeneration cycles, and the BSC durability of sorbents increased with an increase in La loadings and calcination temperature of La/Al2O3. Mn/4.83%La/Al2O3 with La/Al2O3 calcined at 900 °C (M/4.83H) had the best BSC durability, which was better than the BSC durability of MnxOy/Al2O3 (M) during several desulfurization–regeneration cycles. The characterization results showed that the structure of the M/4.83H sorbent was more stable than other sorbents. The M/4.83H sorbent derived the La(AlO3) phase, which could maintain the structural stability of the sorbent during several desulfurization–regeneration cycles. The formation of the LaAlO3 phase may inhibit MnxOy from dissolving into Al2O3, which was beneficial for the durability of sorbents during several successive desulfurization–regeneration cycles.
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高影响因子
CERAMICS INTERNATIONAL
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2019
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IF 3.45
Juan Xi,Guohua Chen,Fei Liu,Fei Shang,Jiwen Xu,Changrong Zhou,Changlai Yuan
In view of lead-free low-softening CuO–ZnO–B 2 O 3 –Li 2 O glass, novel glass/Al 2 O 3 ceramic composites were prepared by solid-state reaction route for ultra-low temperature co-fired ceramic (ULTCC) applications. The phase evolution and compositions, microstructure and microwave dielectric properties of the composites were studied by XRD , SEM and dielectric property measurement. Four phases including Cu 2 Al 6 B 4 O 17 , Li 2 CuB 4 O 8 , CuB 2 O 4 and Al 2 O 3 coexist in the glass/Al 2 O 3 ceramic composites sintered in the range of 640–660 °C. However, the contents and types of the phases depend on the composition of the composites and firing temperature. The optimum properties with a permittivity ε r = 3.79, a quality factor Q × f = 38557 GHz (at 16.64 GHz) and a temperature coefficient of resonance frequency τ f ≈0 ppm/ o C as well as a heat conductivity λ = 1.46W(mK) −1 can be achieved for the glass/ceramic composite containing 10 wt% Al 2 O 3 sintered at 640 °C. Moreover, the composite can be co-fired compatible with Ag and Al electrodes.The as-prepared glass/Al 2 O 3 ceramic composites are promising candidate for ULTCC application.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 47
·17499-17506
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IF 4.052
Sihang Cheng,Yanchun Liu,Yingnan Zhao,Xinyu Zhao,Zhongling Lang,Huaqiao Tan,Tianyu Qiu,Yonghui Wang
Aromatic amino compounds are important and universally used chemical intermediates in a wide range of industrial fields. Thus, their production with high efficiency and selectivity under ambient conditions is expected and demanded in modern industry. Herein, a series of superfine CoNi alloy nanoparticles embedded in Al2O3 nanosheet (CoxNi1−x/Al2O3, where x represents the content of Co in the precursor) catalysts was fabricated from CoNiAl-LDH and used to catalyze the tandem dehydrogenation of ammonia borane (AB) and hydrogenation of nitroaromatics to the corresponding amines. Systematic experiments indicate that the composition, size, morphology and catalytic performance of the CoxNi1−x/Al2O3 catalysts can be easily controlled by changing the content of Ni in the CoNiAl-LDH precursor. Particularly, Co0.67Ni0.33/Al2O3 exhibited the best tandem catalytic performance among the six samples. This as-prepared catalyst not only showed a moderate turn-over-frequency value (TOF: 34.5 molH2 molCo0.67Ni0.33−1 min−1 at 298 K without base or additives) and relatively low activation energy (32.4 kJ mol−1) for the dehydrogenation of AB, but also superior catalytic activity (conversion yield reaching up to 100%) and selectivity (>99%) for the tandem reductive transformation of in excess of sixteen types of nitroaromatics to aromatic amines. Density functional theory (DFT) calculations suggest that the construction of the CoNi alloy optimized the electronic structure with respect to the pure component, promoting its activity for AB hydrolysis and nitroaromatics hydrogenation. Finally, the catalyst could be easily recycled using a magnet due to the magnetic properties of the Co0.67Ni0.33 alloy.
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PubMed
高影响因子
DESALINATION
·
2019
·
IF 6.035
Indah Prihatiningtyas,Gebrehiwet Abrham Gebreslase,Bart Van der Bruggen
In this study, nanocomposite membranes were prepared by incorporating alumina (Al 2 O 3 ) nanoparticles into cellulose triacetate (CTA) membranes in order to enhance the performance of pervaporative desalination . The resulting membranes were characterized by SEM, TGA , water contact angle, water uptake , tensile strength , and FTIR. The desalination performance was investigated as a function of Al 2 O 3 loading, feed temperature (ranging from 40 to 70 °C) and feed concentration (varying from 0 g/L to 90 g/L NaCl). Pervaporation (PV) experiments showed that incorporating 2% Al 2 O 3 into a CTA membrane increased the water flux by 204% compared to pristine CTA (from 2.2 kg m −2 h −1 to 6.7 kg m −2 h −1 ) for a 30 g/L NaCl feed solution at 70 °C, while the salt rejection remained above 99.8%. Moreover, when the CTA-2% Al 2 O 3 nanocomposite membrane was tested with a 90 g/L feed solution, only 25% flux reduction without sacrificing the salt rejection. Furthermore, different feed concentration affected the activation energy of water molecules to diffuse through pristine CTA and CTA/Al 2 O 3 nanocomposite membrane. However, the nanocomposite membrane has a lower apparent activation energy even at high NaCl concentrations, compared to the pristine CTA. This suggests that the developed CTA/Al 2 O 3 nanocomposite membrane is suitable for desalting hypersaline water.
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高影响因子
ENERGY & FUELS
·
2018
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IF 3.024
Tingting Huang,Jingyao Chang,Shuisen He,Chenglong Wen,Yu Fan
This paper proposes a novel one-step hydrothermal polyoxometalate (POM) dispersion method for synthesizing NiMo/Al2O3 hydrodesulfurization (HDS) catalysts with high Ni/Mo atomic ratios. The proposed method disperses Mo12O30(μ2-OH)10H2[Ni(H2O)3]4 on the surface of Al2O3 under a hydrothermal environment, which promotes the formation of highly dispersed MoS2 slabs with increased stacking. The proximity between Ni and Mo in POM improves the decoration of MoS2 slabs by Ni, and the high Ni/Mo ratio of POM synthesized by the one-step method ensures that the corresponding catalyst possesses a high concentration of active NiMoS phases. The as-prepared POM-based NiMo/Al2O3 catalyst possesses much better activity in 4,6-dimethyldibenzothiophene HDS than its counterparts synthesized via the traditional incipient wetness impregnation method.
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高影响因子
危险品化学品经营许可证（带存储）