FUEL
·
2025
·
IF 7.5
Jie Wang,Quanxing Zheng,Hongliang Lu,Jianqiang Fan,Xiaohua Deng,Wenjing Song,Pengfei Ma,Weikun Lai
Selective aqueous hydrogenolysis of cellulose to valuable ketones and alcohols is attractive for biomass utilization. This work developed a TiO 2 layer coated MoO 3 nanorod supported Ni catalyst for the hydrogenolysis of cellulose to ketones and alcohols, which achieved a maximum hexacarbon keto-alcohols yield of 71.2 % with a complete cellulose conversion at 220 °C and 3 MPa H 2 . The interaction of Ni and TiO 2 -MoO 3 oxides provided effective channels for hydrogen transfer, thereby boosting the reduction of MoO 3 to form MoO 2 species. More Lewis acid sites were created which facilitated the isomerization of glucose and retro -aldol condensation of fructose. The cleavage of C O bonds in hydroxyl-containing intermediates thus promoted their selective hydrogenolysis to form ketones and alcohols. Particularly, Ni TiO 2 /MoO 3 catalyst demonstrated excellent reusability due to the protective coating of TiO 2 layer and could be widely used in selective hydrogenolysis of various oxygen containing compounds.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2022
·
IF 8.321
Yutong Shen,Jun Xiao,Qijing Wu,Jingting Su,Li Zhu
To improve the conversion efficiency and reduce the CO 2 emissions associated with the reforming of biomass tar to syngas, photothermal catalysts were prepared in this study through various impregnation methods. Photothermocatalytic CO 2 reforming (PTCR) of benzene as a tar model compound, was conducted using the prepared Ni/TiO 2 -Al 2 O 3 catalysts. The results show that the introduction of TiO 2 facilitates the conversion of NiO to Ni during the photothermal reaction, while the photocatalysis of TiO 2 significantly enhances the photothermocatalytic activity of the Ni/Al 2 O 3 catalysts at low temperatures. Moreover, the methodology for catalyst preparation involving the loading of NiO before TiO 2 is also beneficial to catalyst performance. However, when the mass ratio of TiO 2 to Al 2 O 3 exceeds 1, the specific surface area, pore volume, and structural stability of the catalysts are reduced. The results of PTCR experiment show the following optimal Ni/TiO 2 -Al 2 O 3 catalyst preparation parameters: 25% NiO content and a TiO 2 /Al 2 O 3 ratio of 3:7; 450 °C calcination temperature and a nitrogen atmosphere. The maximum benzene conversion achieved through PTCR with the 0.25Ni/0.3Ti0.7Al(M2) catalyst is 88.2%. However, a large amount of coke is deposited onto the spent catalyst surface, contributing significantly to catalyst deactivation.
研究领域:
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 9
·955
·
IF 4.501
Beilei Cui,Hua Wang,Qingfeng Ge,Xinli Zhu
A series of rutile TiO2-supported Ni catalysts with varying Ni sizes were prepared and reduced at 650 °C to explore the effect of Ni size on the strong metal–support interactions (SMSI) and its consequences on the hydrodeoxygenation (HDO) of m-cresol at 350 °C and atmospheric pressure. When the Ni size increases from 4 to 29.1 nm, the SMSI becomes stronger, e.g., the thickness of the TiOxoverlayer and the coverage extent of TiOxon the Ni particle surface increase. Direct deoxygenation to toluene is the dominant pathway on Ni/TiO2catalysts with varying Ni loadings, with almost no CH4being formed. These results indicate that the TiOxoverlayer significantly alters the property of Ni. That is, the C-C hydrogenolysis activity on bare Ni is completely inhibited due to SMSI, while the deoxygenation activity is improved at the Ni-TiOxinterfacial perimeter sites. Meanwhile, the turnover frequency of HDO on small Ni particles of 4 nm is > 2 times higher than that on large Ni particles of 29.1 nm, indicating that the small Ni particle with moderate SMSI appears to be optimal for the direct deoxygenation of m-cresol to toluene. The results suggest HDO activity may be enhanced by tuning the metal particle size and SMSI degree.Keywords:Ni/TiO2;rutile;strong metal-support interactions;m-cresol;hydrodeoxygenation
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Energy Material Advances
·
2025
·
IF 15.9
Xueke Wang,Yixuan Li,Jessica Nginyo,Daniela Iracelma Difuma Luis,Dong Cao,Zhiyong Deng,Weijie Cai
Reducing the greenhouse gas CO2 in the atmosphere and converting it into high-value-added syngas is regarded as a competitive strategy in line with green and sustainable development. Herein, a series of M/TiO2 (M = Cu, Co, Ni) catalysts were developed for photothermal CO2 reduction with bioethanol, and the synergistic mechanism between photocatalysis and thermocatalysis was deeply investigated. Systematic characteristics and photothermal ethanol dry reforming (EDR) testing results revealed the relevancy between catalytic behavior and microstructure properties of TiO2-supported catalysts. Notably, the Ni/TiO2 catalyst displayed superior catalytic behavior than Cu/TiO2 and Co/TiO2 counterparts, which mainly attributed to their abundant oxygen vacancies and stronger Ni–TiO2 interaction. In addition, both the narrower band gap and higher light absorption ability directly promoted the Ni/TiO2 catalyst possessing outstanding ethanol conversion (94.5%) and controllable H2/CO ratio (0.65) at 450 °C. Furthermore, the relatively less activation energy also determined that the Ni/TiO2 sample possessed the fastest kinetic progression in the EDR process. Therefore, the Ni/TiO2 catalyst exhibited the better photothermal catalytic activity compared with other 2 samples. We anticipate that photothermal synergy would offer good technical guidance to promote the conversion and utilization of greenhouse gas CO2 under relatively low temperature environment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Wenjia Wang,Youtong Xu,Xiaoxiao Wang,Bokun Zhang,Wenying Tian,Jinglai Zhang
Hydrothermal liquefaction (HTL) of microalgae Nannochloropsis (NAS) over various transition metal M/TiO 2 (M = Fe, Co, Ni, Mo, and Mn) was investigated. Ni/TiO 2 was the most effective catalyst to improve the yield and quality of biocrude and the liquefaction conversion. Ni/TiO 2 was characterized by XRD, XRF, and XPS. The research of Effect of reaction temperature on HTL of NAS over Ni/TiO 2 suggested that 300 °C led to a maximum biocrude yield of 48.23% and the highest liquefaction conversion of 89.28%. Adding Ni/TiO 2 catalyst reduced the viscosity and provided more light-fraction in biocrude while brought a slight increase in total acid number (TAN). Gas chromatography-mass spectrometry (GC-MS) analysis demonstrated that adding Ni/TiO 2 considerably changed the composition of biocrude and the possible pathways were discussed. Reproduction test showed the Ni/TiO 2 has an excellent reproduction ability in HTL of NAS.
研究领域:
能源生物学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2023
·
IF 8.8
Li Wu-Lin,Zhang Qing-Qing,Dong Lin,Zhang Wen-Jun,Lin Li-Li,Chen Zu-Peng
Photocatalytic reductive amination of biomass-derived aldehydes is a desirable way to selectively upgrade biomass into value-added nitrogen-containing chemicals under mild conditions. However, it is challenging to produce imines in high selectivity because of the undesirable side reactions caused by the activity of functional groups. Here, we demonstrate the highly reactive and selective production of imines from biomass derived aldehydes via the photocatalytic reductive amination, using a defective TiO 2 supported nickel catalyst. The employment of methanol as the hydrogen donor and ammonia solution as the nitrogen source avoids the use of high-pressure H 2 and expensive amines, rendering the current catalytic process safe, economical, and environmentally friendly. In depth investigations attribute the improved separation and transfer of photogenerated charge carriers to the presence of oxygen vacancies and decorated Ni nanoparticles, thereby accelerating the production of imines from benzaldehyde amination (conversion, 95.8%; selectivity, 95.2%). Furthermore, the developed system could be easily translated to the photocatalytic conversions of various biomass derived aldehydes, which provided an example of a cost-effective and sustainable approach for the valorization of biomass derived feedstocks. Graphic abstract
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Jianhui Liu,Ruizhe Li,Yuan Li,Lina Guo,Zhengyang Xue,Hong Yuan,Shuxin Ouyang
The crystal phase of titanium dioxide (TiO2) has a significant influence on the physicochemical properties and catalytic activities of supported metal catalysts. Herein, we synthesized two catalysts consisting of metallic nickel dispersed on anatase- and rutile-phase TiO2 (a-TiO2 and r-TiO2) supports with a simple impregnation-reduction method and assessed their photothermocatalytic activity for CO hydrogenation. The Ni-loaded r-TiO2 (Ni-r-TiO2) catalyst achieved a CO conversion of 23.3% at a photothermal temperature of 180 °C, which was 5.7 times that of the Ni-loaded a-TiO2 (Ni-a-TiO2) catalyst; meanwhile, the Ni-r-TiO2 catalyst achieved an increased C2+ hydrocarbon selectivity of 73.0% compared with that of the Ni-a-TiO2 catalyst (50.1%). CO-temperature-programmed desorption (CO-TPD), CO pulse experiments, and apparent activation energies of CO revealed the improved CO adsorption and activation abilities of the Ni-r-TiO2 catalyst. In situ diffuse reflectance infrared Fourier transform spectra (in situ DRIFTS) disclosed that the Ni-r-TiO2 catalyst followed direct CO dissociation, which led to the formation of more CH2* intermediates, subsequently yielding C2+ hydrocarbons. This work provides insights into the support design for the preferential formation of value-added chemicals.
研究领域:
催化化学
·
材料科学
·
光热化学
·
多相催化
·
可持续能源转化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Meng Wang,Panpan Zhou,Tong Feng,Zhi Song,Qingguo Ren,Huidong Gu,Xueqing Shi,Qitu Zhang,Lixi Wang
Benefiting from its large specific surface area, abundant defects and functional groups, two-dimensional (2D) laminated Ti 3 C 2 T x MXene is a kind of electromagnetic wave (EMW) absorber with great potential. However, the impedance mismatch caused by the excessive conductivity, inappropriate permittivity and lack of magnetic loss seriously hinders the application of MXene to EMW absorption. Herein, multidimensional hierarchical Ni/TiO 2 /C nanocomposites composed of three-dimensional (3D) hydrangea-like Ni/C microspheres and well-arranged 2D carbon sheets embedded with TiO 2 nanoparticles were successfully fabricated from a Ni-based trimellitic acid framework (Ni-BTC) and Ti 3 C 2 T x MXene via facile in-situ solvothermal assembly and annealing processes. As expected, excellent EMW absorption properties were obtained only by changing the annealing temperature. The minimum reflection loss ( RL min ) value of -45.6 dB and the effective absorption bandwidth (EAB) of 3.40 GHz (14.6–18.0 GHz) with a layer thickness of only 1.5 mm is obtained by annealing the sample at 700 °C. The outstanding ternary multilayer structure and the optimization of magnetoelectric synergy in impedance matching jointly create its remarkable EMW absorption performance. This work is expected to provide a simple and effective method to design MXene-based EMW absorbing materials possessing high absorption intensity, light weight, wide EAB and thin thickness.
研究领域:
材料科学
·
电磁材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 1
·211
·
IF 5.3
Juanjuan Zhou,Wenying Zhou,Mengxue Yuan,Xinbo Dong,Jiebing Zhang,Xuejiao Zhang,Yanqing Zhang,Xiaolong Chen,Yanrong Chen,Xiangrong Liu
An insulating shell on the surface of conductive particles is vital for restraining the dielectric loss and leakage current of polymer composites. So as to inhibit the enormous loss and conductivity of pristine nickel (Ni)/poly(vinylidene fluoride)(PVDF) composites but still harvest a high dielectric permittivity (εr) when filler loading approaches or exceeds the percolation threshold (fc), pristine Ni particles were covered by a layer of titanium dioxide (TiO2) shell via a sol–gel approach, and then they were composited with PVDF. The impacts of the TiO2coating on the dielectric performances of the Ni/PVDF composites were explored as a function of the filler concentration, the shell thickness and frequency. In addition, the dielectric performances were fitted using the Havriliak–Negami (H–N) equation in order to further understand the TiO2shell’s effect on polarization mechanism in the composites. The Ni@TiO2/PVDF composites exhibit highεrand enhanced breakdown strength (Eb) but remarkably suppressed loss and conductivity when compared with pristine Ni/PVDF because the TiO2shell can efficiently stop the direct contact between Ni particles thereby suppressing the long–range electron transportation. Further, the dielectric performances can be effectively tuned through finely adjusting the TiO2shell’ thickness. The resulting Ni@TiO2/PVDF composites with highεrandEbbut low loss show appealing applications in microelectronics and electrical fields.Keywords:dielectric properties;metal;core–shell structure;polymer composites
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 23
·8983-8988
·
IF 8.262
Yu Liu,Xuehui Gao,Zhanglian Hong,Weidong Shi
Uniform nitrogen-doped C/Ni/TiO2 hollow spindles were successfully prepared with Ni nanoparticles encapsulated into the hollow N-doped TiO2/C matrix. This intriguing architecture not only exhibits favorable conductivity, but also provides a large quantity of accessible active sites for lithium ion insertion, thus contributing to superior lithium storage properties.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2024
·Vol. 15
·期 3
·2402295
·
IF 24.4
Songshan Zhu,Shimin Ma,Di Song,Sufang He,Yunzhu Wang,Jichang Lu,Tianhao Ai,Yongming Luo
The regulation and stabilization of strong metal-support interactions (SMSI) in high temperature hydrogen-rich reaction condition remains a huge challenge due to its structural sensitivity. Herein, tunable SMSI is constructed and stabilized on TiO 2 supported Ni catalysts by TiO 2 crystal phase engineering strategy, and then a SMSI-degree-depended ethanol stream reforming (ESR) performance is demonstrated. Rutile supported Ni exhibited a weakened SMSI with 48.6% coverage, exposing more metallic Ni and Ni-TiO 2 perimeter interface sites, and displayed exceptional H 2 yield of 4.7 mol H2 /mol ethanol and an ultra-long stability of 420 h without deactivation at 500 °C. The low reaction energy and high resistance to carbon deposition (0.9 mg c /g cat ·h) and Ni 0 sintering on Ni/r-TiO 2 catalyst explained its excellent catalytic performance. Furthermore, the effect of well-defined SMSI structures on the reaction pathway and deactivation mechanism of the ESR is clarified. This work provides a precedent for the tailor and application of SMSI in high temperature hydrogen-rich reaction conditions.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）