INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Jawad Ahmad Jrar,Tao Sunle,Muhammad Bilal,Faheem K. Butt,Alauddin,Muhammad Faizan,Imed Boukhris,Xiaozhi Wang,Yongcai Zhang,Jianhua Hou
Photocatalytic water splitting and CO 2 reduction offer renewable pathways for generating green fuels. Nevertheless, traditional photocatalysts are often limited by rapid electron-hole recombination. To address this difficulty, we devised a one-step thermal calcination method that concurrently doped graphitic carbon nitride (g-C 3 N 4 ) with aluminum and generates Al 2 O 3 in situ, an Al-doped g-C 3 N 4 heterojunction. Upon excitation by visible light, photo-excited electrons in Al-doped g-C 3 N 4 transfer to the surface Al 2 O 3 nano domains, which act as an electron sink due to their defective and reduced bandgap structure, and holes remain on g-C 3 N 4 . The effective charge separation is facilitated by interfacial band bending and the consequent internal electric field at the heterojunction that collectively inhibits electron-hole recombination and extends charge-carrier lifetimes for redox processes. The Al-doped g-C 3 N 4 /Al 2 O 3 catalyst attains a hydrogen evolution rate 9.4 times greater and a CO 2 reduction rate 6.5 folds greater than pristine CN when exposed to visible-light illumination. The improvement in performance highlights the capability of our single-step designed photocatalyst for solar-driven hydrogen production and CO 2 -to-fuel conversion, supporting the goal of carbon-neutral fuels and the progress of renewable green energy solutions.
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高影响因子
RSC Advances
·
2026
·Vol. 16
·期 32
·29502-29514
·
IF 6.1
Shuman Gao,Xinxin Wang,Shaolei Gao,Mohammad Fahda,Dongyue Wang,Haijun Yu,Zijian You,Xiuning Liu,Liang Qi,Feng Shao,Peng Lu,Valentin Valtchev
JZO zeolite, the first stable aluminosilicate extra-large-pore zeolite, bridges the long-standing gap between microporous and mesoporous zeolites, offering highly accessible pore systems that are beneficial for molecular diffusion, active-site accessibility, and the processing of bulky molecules. However, the control of zeolite framework composition is limited, precluding its use in processes that require different acidic and ion-exchange properties. Here, JZO zeolites with tunable framework Si/Al ratios of ca. 15, 30, and 50 were successfully synthesized through precise adjustment of synthesis parameters, thereby broadening the synthesis window of this intriguing zeolite. A series of JZO zeolites was synthesized via a combination of the seed-assisted and the “deficient fluoride” methods. The crystallization kinetics of JZO was prominently boosted compared to the seed-free and fluoride-free counterpart systems, thanks to the accelerated formation of primary building units of JZO. Comprehensive characterization methods were employed to unveil the concerted role of seeds and fluoride ions. Dimethoxymethane carbonylation to methyl methoxyacetate reaction, a promising alternative route for producing degradable plastic monomers, was evaluated over JZO zeolites, and high activity (ca. 58%) and selectivity (ca. 84%) were achieved in JZO zeolite with Si/Al = 30 obtained by seed-assisted approach over a time-on-stream (TOS) test of 50 h. The product distribution could be rationally controlled by adjusting zeolite compositions. This work expands the viability of JZO zeolite synthesis and lays the foundation for practical applications.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Bing Liu,Hong Yang,Jinbin Xu,Minxue Deng,Yongbo Xiong,Sihui Wu,Zhanwang Li,Yuncong Xu,Mingyue Wang,Wenfeng Han
Stabilizing metastable active centers under harsh reaction conditions represents a significant challenge in heterogeneous catalysis. The F-Al-O species exhibits excellent catalytic activity for the gas-phase dehydrofluorination of potent greenhouse gas hydrofluorocarbons (HFCs) to produce hydrofluoroolefins (HFOs). However, this species is prone to transform into the F-Al-F configuration via excessive fluorination, subsequently leading to catalyst deactivation because of coke deposition. To address this issue, we present a viable strategy for stabilizing the metastable active centers. Al 2 O 3 doped with boron (B), phosphorus (P), and sulfur (S) was synthesized via the sol-gel method. Results demonstrate that in the dehydrofluorination of HFC-245fa, the phosphorus-doped Al 2 O 3 catalyst (P-Al 2 O 3 ) outperforms its boron- and sulfur-doped counterparts, achieving a conversion of 87% compared to 68% and 49%, respectively. The incorporation of P significantly alters the coordination environment of Al 3 + within the Al 2 O 3 lattice, forming O-Al-O-P bonding configurations. During the subsequent dehydrofluorination reaction, these structures undergo fluorination to yield HF-resistant F-Al-O-P species. This process effectively impedes the deep fluorination of Al 2 O 3 into AlF 3 , thereby stabilizing the metastable F-Al-O active centers. Furthermore, this anti-fluorination mechanism significantly suppresses catalyst coking and prevents pore structure collapse. In the dehydrofluorination of HFC-245fa to HFO-1234ze, the P-Al 2 O 3 catalyst achieved a high conversion of 87%, representing an approximately threefold enhancement over conventional Al 2 O 3 , and no significant deactivation trend was observed after 500 h of reaction. This work provides a fundamental understanding of stabilizing metastable active centers and paves a practical pathway for designing robust catalysts for reactions under corrosive atmospheres.
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CATALYSIS TODAY
·
2020
·
IF 5.825
Jinfeng Han,Caixia Liu,Qingling Liu,Shuangchun Lu,Yalian Bi,Xiaohan Wang,Mingyu Guo,Chunfeng Song,Na Ji,Xuebin Lu,Degang Ma,Zhenguo Li
Novel Al-rich OFF-CHA twin-crystal zeolite was synthesized by one-pot hydrothermal method, and applied in ammonia-selective catalytic reduction (NH 3 -SCR) after copper ion exchange. Results indicated that Cu content in Cu-OFF-CHA played a significant role in NH 3 -SCR reaction. The insufficiency of copper activity sites and the formation of CuOx were the main reasons affecting low and high temperature SCR activity of catalyst, respectively. Cu 3.1 -OFF-CHA, with the optimal copper content, demonstrated over 90 % NOx conversion and exhibited excellent N 2 selectivity in the range from 160 to 550 ℃. Further research verified that the SCR activity of Cu 3.1 -OFF-CHA maintained above 80 % in the temperature range from 180–450 °C after hydrothermal treatment 16 h. The reason might be that Cu 2+ in Cu-OFF-CHA was migrated from CHA to OFF sites after hydrothermal treatment, and Cu 2+ in OFF sites on Cu-OFF-CHA was more stable, resulting in less conversion of the active site to CuOx clusters. Cu-OFF-CHA has the potential to be applied in SCR after-treatment systems of diesel exhaust due to the excellent SCR activity and hydrothermal stability.
研究领域:
催化化学
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环境化学
·
材料科学
·
化学工程
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高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 45
·e202203721
·
IF 2.307
Weihua Yu,Jianhua Kuang,Qingqing Hu,Zhonghua Wang,Yunwen Liao,Zhengjun Cheng
Graphical A new ratio fluorescent probe (RF-probe) based on the mixing of red-emitting D-penicillamine (DPA) stabilized copper nanoclusters (DPA-CuNCs) with pyridoxal 5’-phosphate (PLP) was designed for sensitive and selective determination of Al 3+ . The excess accumulation of nonessential Al 3+ in the human body can cause serious health problems, thus there is significant interest in the detection of Al 3+ . A new ratio fluorescent probe (RF-probe) based on the mixing of red-emitting D-penicillamine (DPA) stabilized copper nanoclusters (DPA-CuNCs) with pyridoxal 5’-phosphate (PLP) was designed for sensitive and selective determination of Al 3+ . The −CHO group of PLP is expected to form an imine linkage with the free −NH 2 group available of the DPA on the surface of DPA-CuNCs. The content of Al 3+ could be mensurated by the as-prepared RF-probe with a linear response in the range of 1.33–46.67 μmol ⋅ L −1 , and corresponding limit of detection (LOD) was calculated to be 0.33 μmol ⋅ L −1 . Moreover, the RF-probe was successfully extended to the assay of Al 3+ in aluminum carbonate chewing tablets, baking powder, pond water and drink water with satisfactory results compared to the standard atomic absorption spectroscopy (AAS).
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高影响因子
Defence Technology
·
2022
·
IF 4.035
Xiaogang Guo,Taotao Liang,Junfeng Guo,Huisheng Huang,Shuying Kong,Jianwei Shi,Binfang Yuan,Qi Sun
For solving the dilemma of the short exothermic life-span of WO 3 based metastable interstitial composites (MICs) with extensive application prospect, this paper has firstly designed the promising anti-wetting Al/WO 3 MICs via electrophoresis assembly of nano-Al and WO 3 particles fabricated by hydrothermal synthesis method, followed by the subsequent fluorination treatment. A combination of X ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR) techniques were utilized in order to characterize the crystal structure, microstructure, and elemental composition distribution of target films after different natural exposure tests. The product with uniform distribution and high purity possesses a high contact angle of ∼170° and a minute sliding angle of ∼1°, and displays the outstanding anti-wetting property using droplets with different surface tensions. It also shows great moisture stability in high relative-humidity circumstances after one year of the natural exposure experiment. Notably, the heat output of a fresh sample can reach up to 2.3 kJ/g and retain 96% after the whole exposure test, showing outstanding thermo-stability for at least one year. This work further proposed the mechanism of anti-wetting Al/WO 3 MICs considering the variation tendency of their DSC curve, providing a valuable theoretical reference for designing other self-protected MICs with a long exothermic life-span applied in wide fields of national defense, military industry, etc.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yingshu Liu,Haiyang Tao,Xiong Yang,Xiaoyong Wu,Jinjuan Li,Chuanzhao Zhang,Ralph T. Yang,Ziyi Li
Adsorption is a promising technology for capturing nitrogen oxides (NO x ) from humid flue gases , for which as the preferred NO x adsorbent, zeolite with an appropriate silica to alumina (Si/Al) ratio provides the key step for success in practical applications. In this work, the effects of Si/Al ratio, temperature, relative humidity (RH), and feed gas (NO x -H 2 O(g)–CO 2 –O 2 -N 2 ) compositions on NO x sorption behavior on HZSM-5 zeolites were systematically investigated, based on a series of characterizations, fixed-bed adsorption and temperature programmed desorption (TPD) tests. The low-silica HZSM-5(25) showed the best performance (326.6 μmol/g and 39.2 μmol/g at dry and 90%RH) as compared to others with higher Si/Al ratios at each RH, in which the roll-up effect was positively correlated with the Si/Al ratios and humidity. O 2 enhanced NO x adsorption and reached an optimal adsorption capacity at the concentration of 14%, while CO 2 had little effect on NO x adsorption. The decrease in temperature increased NO x adsorption capacity on HZSM-5(25), benefitting from NO 2 physisorption as well as satisfactory NO oxidation within the active adsorbent structure. The facile thermal desorption of NO x and significant NO–NO 2 conversion on HZSM-5(25) was exhibited by bimodal TPD peaks at 343–353K and 533–543K respective for NO and NO 2 , in contrast to those on Silicalite-1. A potential “water-resistant” strategy via the enhancement of NO x adsorption competitiveness was revealed, providing a theoretical guideline for NO x adsorbent screening in industrial applications.
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高影响因子
FUEL
·
2022
·
IF 8.035
Min Zhong,Pengju Yang,Bo Hou,Ming Xia,Jungang Wang
The main requirement for Co-based catalysts in Fischer-Tropsch synthesis (FTS) is to efficiently convert syngas (H 2 +CO) into long-chain hydrocarbons (C 5+ ). Since the formation of long-chain hydrocarbons (C 5+ ) is thermodynamically favored at low temperatures, it is desirable to develop efficient catalytic systems that can allow working at a relatively low reaction temperature. Herein, the Al 2 O 3 /Al composite has been used as support for the Co-based catalysts. The catalytic performance of Co/Al 2 O 3 /Al catalysts in FTS can be regulated by varying the Al 2 O 3 -layer thickness. With the thickening of Al 2 O 3 -layer, the catalytic activity and selectivity toward C 5+ hydrocarbons over Co/Al 2 O 3 /Al decrease markedly, although the number of accessible Co 0 sites increases obviously. This Al 2 O 3 -thickness-dependent FTS performance can be attributed to a variation of the proportion of active species Co-AlO x -Al and less active species Co-Al 2 O 3 . On the basis of the above finding, a highly active catalyst (Co/Al-0) has been developed using commercial Al metal powers as support, which will enable the FTS process to work at a fairly low reaction temperature (below 185 °C) and maintain excellent catalytic activity. This study provides a practical but low-cost method to modulate the electronic properties of metal catalysts by using available metal powders.
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高影响因子
APPLIED ENERGY
·
2022
·
IF 11.446
Xianyao Yan,Yingjie Li,Chaoying Sun,Chunxiao Zhang,Liguo Yang,Xiaoxu Fan,Leizhe Chu
The sorption-enhanced steam gasification of biomass (SESGB) using CaO-based materials is considered as a promising method for H 2 production. Ca-Al-Ce material has been reported as a good bi-functional material in SESGB process. Red mud is a solid waste in aluminium industry with large yield, which is rich in Fe 2 O 3 . In this work, a red mud-doped Ca-Al-Ce bi-functional material was prepared by wet-mechanical mixing method for H 2 production from SESGB. The CO 2 capture, H 2 production, and tar reduction performances during SESGB process using the red mud-doped Ca-Al-Ce bi-functional material were studied. The results show that the optimum addition amount of red mud in the bi-functional material is 5 wt%. After 20 SESGB cycles, the H 2 concentration using the red mud-doped Ca-Al-Ce material achieves 65.1 vol%, which is 82.4% higher than that using Ca-Al-Ce material. Besides, with the addition of red mud in the bi-functional material, the tar, residue char yields and CO 2 concentration decrease by 25.2%, 8.6% and 52.2%, respectively. Fe 2 O 3 in the red mud reacts with CaO to form Ca 2 Fe 2 O 5 in the 1st cycle, and Ca 2 Fe 2 O 5 is stable during 20 cycles, which is beneficial for the generation of oxygen vacancy. The oxidation states of Fe species in the material increase with the number of SESGB cycles, thus the catalytic effects on water gas shift reaction and tar reduction are promoted. The red mud addition is the key factor that results in high H 2 production, CO 2 capture and tar reduction performances, so the red mud-doped Ca-Al-Ce material appears promising for SESGB.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junjie Lu,Dong Wang,Keqiang Zhang,Suwen Li,Bin Zhang,Xueqin Zhang,Lu Zhang,Wenqing Wang,Ying Li,Rujie He
To obtain both plasticity and toughness of the material at the same time, various manufacturing techniques of ceramic-metal composites and structures have been studied. In this work, a bio-inspired Al 2 O 3 ceramic scaffold with Gyroid structure was designed and prepared by stereolithographic (SL) additive manufacturing , then the Al 2 O 3 /Al ceramic-metal hybrid structure was prepared by infiltrating molten Al into the Al 2 O 3 ceramic structure. The performances of the Al 2 O 3 ceramic scaffold and the Al 2 O 3 /Al ceramic-metal hybrid structure were compared and analyzed by a quasi-static compression experiment. The quasi-static compressive strength of the pristine Al 2 O 3 scaffold was 14.36 MPa, while that of the Al 2 O 3 /Al ceramic-metal hybrid structure was up to 89.06 MPa. Moreover, the plasticity of the Al 2 O 3 /Al ceramic-metal hybrid structure was much higher than that of the Al 2 O 3 scaffold. During compression, the Al 2 O 3 /Al ceramic-metal hybrid structure had excellent energy absorption, reaching up to 2569.16 KJ/m³, 15 times that of the Al 2 O 3 scaffold. Therefore, this method can obtain materials with excellent ductility and toughness.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 1
·513-526
·
IF 4.186
Bingheng Sun,Benxue Jiang,Jintai Fan,Le Zhang,Long Zhang
Red-emitting color-convertors have attracted considerable attention for promising applications in solid-state lighting (SSL) to improve color rendition. However, the current nitride and fluoride phosphor powders have encountered several challenges, such as high cost, narrow emission bands, and insufficient stability during operation, which limit the development of high-power full-spectrum SSL. In this study, thermally robust Gd 3 (Al,Ga) 5 O 12 :Mn (GAGG:Mn) solid-solution ceramics (SSCs) with dual wavelength red-emission bands were prepared via an oxygen solid-state sintering reaction. The doped Mn ions occupied octahedral Al 3+ and Ga 3+ sites to generate Mn 4+ luminescent centers with pronounced deep-red emissions peaking at 698 nm ( 2 E → 4 A 2 ), and Mn 2+ luminescent centers with broad red emissions at 628 nm ( 4 T 1 → 6 A 1 ). Because the cationic radius matching effect induced the regulation of valence state of Mn, the photoluminescence of the GAGG:Mn SSCs can be tailored by the substitution of Al 3+ with Ga 3+ . Moreover, the Mn 3+ also existed in the GAGG lattice host, and their concentration decreased with increasing Ga 3+ contents owing to the mismatch of ionic radius between Mn 3+ and Ga 3+ ions. With the optimization of Al/Ga ratio and concentration of Mn ions, a broad emission band ranging from 550 to 800 nm (bandwidth = 250 nm) was achieved from Gd 3 Al 3 Ga 2 O 12 :0.3%Mn SSCs upon 465-nm excitation. Moreover, the GAGG:Mn SSC has over 17-fold enhanced thermal conductivity compared with the corresponding phosphor powder. This paper opens a door of regulating the valence state of luminescence centers with cation substitution and the application of oxide red-emitting color-convertors.
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高影响因子
Advanced Electronic Materials
·
2022
·Vol. 8
·期 11
·2200577
·
IF 7.633
Nan Xin,Guihua Tang,Yifei Li,Hao Shen,Yinan Nie,Min Zhang,Xin Zhao
Single crystal tin selenide (SnSe) has a recorded high thermoelectric figure of merit (ZT) value of 2.6 at 923 K, but it is easy to form mechanical cracks and difficult to apply in thermoelectric conversion devices. Polycrystalline SnSe has better mechanical properties but inferior ZT values, which needs further optimization for applications. This work aims at enhancing the thermoelectric performance of polycrystalline SnSe through synergistic optimization of sliver (Ag) and aluminum (Al) co-doping with the hydrogen reduction. The effects of Ag and Al doping on electronic transport properties are systematically investigated by density functional theory calculation and experimental measurement. Compared with pristine SnSe, Ag doping can effectively increase the hole concentration to 1.58 × 10 19 cm −3 and improve the conductivity. Results also indicate that using Al dopant may slightly decrease the hole concentration but reduce the thermal excitation temperature, and introduce point defects reducing the lattice thermal conductivity through scattering phonons. In addition, the hydrogen reduction of sample powders before synthesis can effectively remove Sn oxides and reduce lattice thermal conductivity. At last, a state-of-the-art maximum ZT value of 1.69 at 823 K is obtained in Ag 0.01 Al 0.01 Sn 0.98 Se. This study provides a theoretical basis and technical guidance for designing high-performance polycrystalline SnSe.
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高影响因子
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