JOURNAL OF POROUS MATERIALS
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2020
·Vol. 27
·期 5
·1455-1466
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IF 2.183
Yuan Zhishuai,Cheng Yuchun,Ma Shoutao,Jiang Zhen,Zhou Yisi,Wang Yingjun,Zhang Wei,Suo Yanhua
A new method called Instant Exactness Synthesis (IES), which was applied to prepare SAPO-11 molecular sieve, was introduced innovatively. The metal–acid bifunctional Ni/SAPO-11-IES catalyst with a Ni content of 4% was prepared by the impregnation method. Ni/SAPO-11-H catalyst was prepared as a comparative sample through the traditional hydrothermal method. In addition, the growth mechanism was used to explain the excellent performance of catalyst prepared by IES method in detail. The structure of Ni/SAPO-11-IES was confirmed via XRD and TEM characterization. The pore structure of the molecular sieve was determined by nitrogen adsorption and desorption. 29 Si MAS NMR measurement was used to illustrate multiple silicon environment which supported the excellent acidity in NH 3 -TPD measurement. Furthermore, the favourable dispersibility of Ni species was proved by the mapping of the elements and EDS. Benefiting from the superior performance of materials, Ni/SAPO-11-IES catalyst exhibited a higher catalytic performance for n-heptane hydroisomerization with n-heptane conversion of 82% and isoheptane selectivity of 86%, respectively, compared with other catalysts in the same system. The study also provides new ideas for the preparation of molecular sieve materials.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Xiaofeng Liu,Ruiji Wang,Fayou Tian,Hao Ren,Jinglin Wang,Yan Lin,Zhongtao Li,Mingbo Wu
Development of electrocatalytic reduction of carbonyl compounds for carbon‑carbon (C C) coupling represents an effective pathway to achieve sustainable synthesis of multi‑carbon chemicals. The hydrogen evolution reaction (HER) is considered the most significant competitive process, which could be suppressed by weakening the adsorption of protons on interface or by making protons in the electrolyte inactive through the use of certain additives. However, increasing the coverage of protons and carbonyl molecules are necessary to facilitate the generation of hydrogenation intermediates during C C coupling. To reconcile this contradiction, a Ni-based catalyst for electrocatalytic coupling of formaldehyde has been developed, decorated with phosphate groups around Ni sits. The following enhancement could be achieved: 1) Ni sites enhance the adsorption of formaldehyde on catalyst surface and promote their electroreduction; 2) Phosphate groups near the Ni sites can act as protons affinity sites to prevent their self-coupling. As the result, the adsorbed HCHO and hydrogen can be balanced to facile the formation of intermediate *CH 2 OH during C C coupling. Consequently, the PD-Ni/C@CP catalyst exhibits outstanding performance in the continuous preparation of ethylene glycol, with a production rate of 22 mmol/(L·min) and a Faradaic efficiency exceeding 90%, highlighting its potential for the efficient and sustainable synthesis of other high-value chemicals.
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Journal of Materials Chemistry A
·
2026
·
IF 9.2
Niming Zheng,Jiaxin Yang,Xu Guo,Yun Li,Han Gao,Hongtao Guan,Yang Zhang
Achieving tunable, high-performance electrical and electromagnetic properties in polymer-based composites remains challenging due to insufficient understanding of the relation between particle structure, surface conduction, and internal tunneling in segregated networks. Here, a multi-scale strategy is presented to elucidate and optimize the electrical conduction mechanisms in nickel-coated polyethylene terephthalate (PET@Ni) composite films with segregated network systems. Composite films with controlled particle size and tailored Ni shell thickness were fabricated via electroless plating and sequential hot pressing. The conductive network architecture governed transport behaviors. Surface conduction dominated in thin films, while interparticle tunneling dominated in thick configurations. A multi-level theoretical model was developed. Relaxation dynamics and quantum mechanical corrections based on density functional theory were incorporated. The proposed model describes the observed conductivity behaviors with high accuracy (R² > 0.98). Finite element simulations further confirmed the spatially heterogeneous current densities and electric field intensities. Microcapacitive behavior was enhanced in films with smaller particles due to increased Ni shell connectivity. Dual-layer structures provided additional tunability. Secondary Ni plating boosted electromagnetic interference (EMI) shielding up to 63.77 dB. A robust structure-property framework was established. These results offer new design principles for scalable, multifunctional polymer-based composites in advanced electronics, EMI shielding, and next-generation sensing systems.
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
De Xia,Hao Wang,Ben Li,Bing Lu,Yong Wang,Shanjun Mao
This study presents a novel Rh 7 Ni 1 P 4 /SiO 2 catalyst that significantly improves the hydroformylation of olefins, achieving a turnover frequency of 3433h −1 . By incorporating nickel (Ni) and phosphorus (P) into rhodium (Rh), the electronic structure of Rh was effectively modified, enhancing olefin adsorption and reducing CO binding energy. This dual modulation boosts catalytic performance by shifting the rate-determining step from CO insertion to acyl hydrogenation, thereby accelerating the reaction rate. Experimental results, supported by density functional theory (DFT) calculations, reveal that the Rh 7 Ni 1 P 4 /SiO 2 catalyst reduces Rh-CO interactions, minimizes rhodium leaching, and exhibits excellent stability over multiple cycles. This research advances the design of robust and efficient catalysts for industrial hydroformylation processes.
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Applied Materials Today
·
2026
·
IF 7
Jiesai Ma,Junhua Zhao,Qin Hu,Ruo Wang,Shen Wang,Yangjun Mao,Xiaohong Tao,Hexin Wang,Jiawen Hong,Qingqing Xu,Xiangsheng Xu
Metal-organic frameworks (MOFs) are promising electrochromic materials owing to their rapid response and multicolor switching capabilities. However, their performance in thin-film configurations is often limited by slow switching speeds and insufficient optical contrast. In this study, a conjugated biphenyl-based ligand, 4,4′-dihydroxy-3,3′-biphenyldicarboxylic acid (DHBDC), was employed to synthesize Co/Ni MOF films directly on fluorine-doped tin oxide (FTO) substrates via a one-pot solvothermal method. The introduction of Co 2+ and the Ni/Co molar ratio are identified as decisive factors for steering the mesoscopic architecture, enabling precise tuning from agglomerated particles to a well-aligned nanorod arrays. The film fabricated with an equimolar (1:1) Ni/Co ratio at 150 °C delivers optimal performance, exhibiting a high optical contrast of 84% at 900 nm with rapid coloration/bleaching times of 2.9 s and 7.0 s, respectively, alongside good stability over 1000 cycles. Electrochemical analysis confirms that this optimal morphology yields the highest charge transport kinetics and Li + diffusion coefficient. This work provides a viable strategy and fundamental insights for developing high-performance MOF-based electrochromic materials.
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Solar RRL
·
2026
·Vol. 10
·期 2
·e202500917
·
IF 4.7
Lu Peng,Qiang Li,Siting Shao,Meng Zhang,Hongpeng Jia
The escalating CO 2 concentration and energy demand necessitate efficient CO 2 conversion strategies. Photothermal catalytic CO 2 methanation is a promising strategy, yet its efficiency is hindered by the inherent stability of CO 2 and the rapid recombination of photogenerated charge carriers. Among non-noble metal catalysts, Ni-based catalyst is a promising candidate for CO 2 methanation, with sintering and agglomeration remaining to be addressed. Herein, NiMn/TiO 2 bimetallic catalysts with varying Ni/Mn ratios were synthesized to overcome these issues. Characterization results demonstrate that Mn incorporation enhances CO 2 adsorption capacity by increasing oxygen vacancies and significantly improves the separation efficiency of photogenerated carriers. Furthermore, Mn doping optimizes the electronic structure of the catalyst, narrowing its bandgap for improved light absorption. But the catalytic performance is highly dependent on the Ni/Mn ratio. The synergistic effect of Ni and Mn can be maximized when the Ni/Mn ratio is 1:1, which is specifically manifested as the best catalytic activity. Excessive Mn loading covers active Ni sites and impedes electron transfer, thereby degrading activity. Therefore, this work highlights the importance of Mn as a promoter in designing efficient non-noble metal catalysts for photothermal CO 2 conversion.
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ChemCatChem
·
2026
·Vol. 18
·期 2
·e01717
·
IF 3.9
Yimeng Li,Shiji Guo,Ruchao Yin,Jinlong Huang,Ying Kan,Yufei Lan,Hong Zhang,Hailian Tang,Guoyi Bai
The hydrogenation of dioctyl phthalate (DOP) to dioctyl 1,2-cyclohexanedicarboxylate represents an effective pathway for the production of environmentally friendly plasticizers. However, due to the intrinsic stability of the aromatic ring, the development of efficient and stable non-noble metal catalysts remains a key challenge. In this work, an efficient and stable La-modified MCM-41-supported Ni catalyst (Ni/La-M) was developed. The effects of different La introduction methods on the structural and catalytic properties of the catalyst were systematically investigated. The Ni/La-M catalyst, prepared via a two-step hydrothermal method, achieved 99% DOP conversion under mild conditions (140 °C, 2 MPa H 2 , 1 h) and retained over 90% activity after nine cycles. Characterization results revealed that La incorporation significantly enhanced the interaction between Ni and the support, effectively suppressed Ni particle sintering, and increased the fraction of exposed active sites. Compared with other La-introduction methods, the “La-first, Ni-second” strategy exhibited superior activity retention and cycling stability. This approach provides a new design strategy concept for constructing high-performance non-noble metal catalysts in a controllable manner. Graphical La was introduced during MCM-41 synthesis to build a La-modified support, enhancing Ni–support interaction, dispersing Ni species, and increasing catalyst acidity. This strategy improves catalytic activity for dioctyl phthalate hydrogenation to dioctyl 1,2-cyclohexanedicarboxylate and suppresses Ni sintering and leaching, providing mechanistic insight for designing stable green hydrogenation catalysts.
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ChemCatChem
·
2026
·Vol. 18
·期 1
·e01678
·
IF 3.9
Zien Bao,Xiaohong Ren,Xiaoxin Wang,Zeming Rong
This study focuses on the catalytic transformation of a lignin model compound, 4-propylguaiacol, without external hydrogen. The reaction using a Ni/MgO catalyst and water as the solvent, conducted at 220°C under 5 bar N 2 for 2 h, achieved 97.8% conversion and 94.8% selectivity toward phenolic products. During the reaction, the methoxy group in 4-propylguaiacol is cleaved from the aromatic ring at Ni active sites and subsequently reacts with hydrogen radicals generated from water dissociation to form methanol. The methanol then undergoes aqueous-phase reforming, providing additional in-situ hydrogen to drive the hydrodeoxygenation process. The Ni/MgO catalyst showed good recyclability over three consecutive cycles, with only a slight decline in activity. Furthermore, this catalyst was applied to the depolymerization of real lignin, and the effects of reaction parameters on product yield were investigated. Among the tested conditions, a maximum monomer yield of 76.7 wt% was obtained at 280°C under 5 bar N 2 for 6 h. Graphical This work presents a sustainable strategy for producing phenolic monomers from lignin-derived compounds using non-noble metal catalysts without external hydrogen.
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JOURNAL OF POROUS MATERIALS
·
2026
·
IF 3.2
Guo Hanxu,Fu Sen,Yuan Hong
Hierarchical zeolites can provide multidimensional spatial networks, thereby holding significant potential as catalysts for BTX production from biomass pyrolysis. In this study, nano-ZSM-5 zeolite (Z X-X ) with a hierarchical pore structure was synthesized using glycine as a growth inhibitor. Due to the exceptional ability of Ni to cleave C–C and C–H bonds, Ni modification was performed on the Z 30-0.2 catalyst. The effects of glycine and Ni loading on the morphology and pore structure of the zeolites were systematically investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N 2 adsorption–desorption. The results demonstrated that the particle size of 10 wt% Ni-Z 30-0.2 zeolite ranged from 200 to 300 nm, with a BET surface area of 314 m 2 /g and abundant mesopores. The NH 3 -TPD results showed that the acid amount of 10 wt% Ni-Z 30-0.2 was 0.72 mmol/g. The prepared zeolite was employed in a fixed-bed reactor to catalyze the pyrolysis of oleic acid for the production of benzene, toluene, and xylene (BTX). The introduction of metal Ni significantly enhanced the BTX yield. At 500 ℃, the average BTX yield achieved with the 10 wt% Ni-Z 30-0.2 catalyst was 19.4 wt%, which was higher than that of the zeolite without Ni loading.
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Small
·
2022
·Vol. 19
·期 8
·2206071
·
IF 15.153
Fangqing Wang,Ying Li,Rui Zhang,Hui Liu,Yangyang Zhang,Xuerong Zheng,Jun Zhang,Cong Chen,Shijian Zheng,Huolin L. Xin
Atomically dispersed nitrogen-coordinated 3d transition-metal site on carbon support (M-NC) are promising alternatives to Pt group metal-based catalysts toward oxygen reduction reaction (ORR). However, despite the excellent activities of most of M-NC catalysts, such as Fe-NC, Co-NC et al., their durability is far from satisfactory due to Fenton reaction. Herein, this work reports a novel Si-doped Ni-NC catalyst (Ni-SiNC) that possesses high activity and excellent stability. X-ray absorption fine structure and aberration-corrected transmission electron microscopy uncover that the single-atom Ni site is coordinated with one Si atom and three N atoms, constructing Ni-Si 1 N 3 moiety. The Ni-SiNC catalyst exhibits a half-wave potential (E 1/2 ) of 0.866 V versus RHE, with a distinguished long-term durability in alkaline media of only 10 mV negative shift in E 1/2 after 35 000 cycles, which is also validated in Zn-air battery. Density functional theory calculations reveal that the Ni-Si 1 N 3 moiety facilitates ORR kinetics through optimizing the adsorption of intermediates.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yudi Wang,Jialong Duan,Yuanyuan Zhao,Xiya Yang,Qunwei Tang
Developing efficient and cost-effective counter electrodes (CEs) to catalyze triiodide reduction reaction is a persistent objective for high-performance dye-sensitized solar cells (DSSCs). One promising solution is to design electron-enriched electrode materials by combining conductive polymers with alloys. In this work, ternary hybrid PtM@polyaniline (M = Ni, FeNi) CEs are synthesized by one-step replacement reaction and in-situ polymerization reaction. When assembling into liquid-junction DSSCs, the power conversion efficiencies of 8.52% and 8.39% for the devices tailored with PtNi@polyaniline and PtFeNi@polyaniline CEs can be obtained. The experimental results demonstrate that the enhanced photovoltaic performances are mainly attributed to matching work function and high electrocatalytic activity of these well-designed hybrid CEs. Arising from the competitive reactions between transition metal and I 2 /I 3 − species, the dissolution reaction of Pt in liquid electrolyte is restricted and therefore the long-term stability of corresponding devices are significantly enhanced.
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CATALYSIS TODAY
·
2018
·
IF 4.667
Dawang Chu,Chen Zhao
The effective and selective conversion of cellulose to valuable fuels and chemicals is highly attractive. In this paper, we prepared a catalyst with the adjacent surface Cu° and oxygen-deficient WO x (2 < x < 3) species by reduction of CuWO 4 precursor, and such catalyst coupled with Ni/activated carbon (AC) attained high yield (71 wt%) and good cycling performances in catalyzing one-step hydrothermal conversion of cellulose to ethylene glycol (EG), highly superior to the performances on physically mixed Ni/C, Cu/C and WO 3 . The increased Cu doping amounts led to a higher ratio of the lower valence state W (V or IV) to the high valence W(VI) as indicated by XPS, XRD, and TPR-H 2 analyses. The oxygen vacancies on the hydrogen-reduced CuWO 4 sample dramatically increased, probably due to the benefits from the substantial dissociated H• on the neighboring Cu° center. The EG yields from cellulose are shown to be proportional to the concentrations of oxygen vacancies on WO x , which catalyzes the important elementary retro-aldol step reaction via adsorbing C 6 sugar intermediates in a specific way. It is inferred that Cu introduction is mainly used to create more oxygen vacancies on the WO x surface that helps adsorbing oxygenates, while Ni fast hydrogenates of hydroxyacetaldehyde to EG and avoids coking, constructing a multi-functional synergistic catalytic process from converting of cellulose to EG in the high-temperature water
研究领域:
催化化学
·
生物质转化
·
绿色化学
·
材料化学
·
能源化学
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