FUEL
·
2022
·
IF 8.035
Zhuojie Zhong,Junxuan Li,Minyin Jian,Riyang Shu,Zhipeng Tian,Chao Wang,Ying Chen,Ning Shi,Yanxue Wu
Hydrodeoxygenation (HDO) reaction is a necessary refinery process for lignin-derived phenolic compounds to be used as high quality liquid fuels. Catalyst morphology makes a big difference on the HDO performance through changing the properties of metal site and acid site, while the catalytic mechanism is still not very clear. In this work, four kinds of Ru/TiO 2 catalysts with different morphology were prepared by photochemical method and all of them achieved a high Ru metal dispersion. A series of catalyst characterizations were carried out, including XRD, BET, SEM, TEM, H 2 -TPD and NH 3 -TPD, in order to explore the crystal structure, surface property, Ru metal dispersion, hydrogen adsorption capacity as well as acid properties. Results showed that Ru/TNP catalyst possessed a large surface area, an abundance of medium strength acid sites and a good hydrogen adsorption capacity. The HDO performances on lignin-derived phenolic compounds were also compared, in which Ru/TNP catalyst presented the best HDO performance. The guaiacol conversion and the selectivity of cyclohexane product were both close to 100 % at 250 °C under 1 MPa hydrogen pressure. Moreover, the content of hydrocarbons increased from 11.1 % to 60.8 % in the lignin-oil upgrading process.
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
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Qian Ji,YaFei Hou,ShiXin Wei,Yang Liu,Peng Du,LaiHui Luo,Wei Ping Li
TiO2 nanoarray (TNA) is usually used to improve the energy storage performance of the polymer composite; however, owing to the paradox between polarization and breakdown strength, the discharged energy density of TNA-based composite is always restricted. In this study, a novel bilayer composite with excellent energy storage performance has been designed and fabricated by combining aligned TNA and random TiO2 nanowires (TO NWs) with poly(vinylidene fluoride) (PVDF) matrix. Interestingly, a superior discharged energy density of 16.13 J/cm3 was obtained in the (5 vol % TO NWs/TNA)–PVDF composite, which is 2.0 times higher than that of pure PVDF matrix (8.23 J/cm3) due to the simultaneously improved polarization and breakdown strength. Additionally, the corresponding energy efficiency remains high (77.37%) owing to the nonferroelectric characteristics of the TO fillers and the suppressed leakage current density. Considering the excellent and sharply incremental discharged energy density and superior energy efficiency of the (5 vol % TO NWs/TNA)–PVDF composite, this demonstrated work provides a method to obtain high discharged energy density and energy efficiency simultaneously.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 15
·155402
·
IF 2.9
Wei Zhang,Xing Zhang,Lina Zhang,Jinwen Ma,Xiaotong Yin,Yuxin Tian,Chuang Wang,Qiushi Wang
A novel 3D hierarchical TiO2/CaIn2S4/C3N4 arrays with dual heterojunctions photoanode is constructed by stepwise deposition of CaIn2S4 nanosheets and ultrathin C3N4 onto the well-aligned TiO2 nanorods arrays. Integrating the merit of the superior ability of CaIn2S4 and C3N4 to harvest visible light, dual type-Ⅱ heterojunction band structure and one-dimensional ordered nanostructures, the TiO2/CaIn2S4/C3N4 photoanode exhibits simultaneous significant improvements in visible-light harvesting, charge separation and electron transfer capability. At 1.23 V (versus reversible hydrogen electrode) under AM 1.5 G irradiation, the TiO2/CaIn2S475/C3N4 photoanode exhibits a photocurrent density of 4.5 mA cm−2, which is 5.2 and 51.1-fold higher than that of TiO2/CaIn2S475 and pristine TiO2 photoanode, respectively. Moreover, the applied bias photo-to-current efficiency (ABPE) of the TiO2/CaIn2S475/C3N4 photoanode reaches 3.5% at 0.36 V (versus reversible hydrogen electrode). These results are helpful for fabricating more efficient heterostructure photoelectrodes.
研究领域:
材料科学
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光催化
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能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganics
·
2022
·Vol. 10
·期 3
·29
·
IF 3.149
Van Thi Thanh Ho,Dung Hung Chau,Khang Quang Bui,Ngan Thi Thanh Nguyen,Thi Kim Ngan Tran,Long Giang Bach,Son Nguyen Truong
TiO2-based photocatalysts still have some limitations such as large bandgap and low surface area, leading to low efficiency in the photocatalytic degradation of VOCs and limiting it to use in sunlight. Here we report that the nanostructured Ir-doped TiO2as an efficient photocatalyst generates an excellent risk-reduction material of gaseous toluene. We have succeeded in developing a nanostructured Ir-dopedTiO2and initially found that excellent efficient photocatalytic VOC decomposition can be achieved in our materials The nanostructured Ir-dopedTiO2was synthesized by a one pot, low temperature hydrothermal process with different ratios of Ir doped into theTiO2. It exhibited a high surface area, uniformly spherical morphology of 10–15 nm. Its activity for the photocatalytic degradation of gaseous toluene exhibited up to 97.5% under UV light. This enhancement could be explained by iridium doping which created a high concentration oxygen vacancy and changed the recombination rate of the photogenerated charge carriers. More generally, our study indicates a strategic way to develop the novel nanostructured material for numerous applications.Keywords:photocatalysts;Ir-doped TiO2;VOCs;toluene
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 24
·22297-22311
·
IF 2.22
Guan Yiyin,Liu Wenjie,Zuo Shixiang,Yuan Kun,Wu Fengqin,Ji Jinjin,Yao Chao
In this paper, rutile phase titanium oxide/Sb-SnO 2 /anatase phase titanium oxide (TiO 2 (R)/C-TiO 2 (A)) heterostructured nanocomposites were prepared by a sol–gel method and a hydrothermal method. By optimizing the mass ratio between TiO 2 (R) and C-TiO 2 (A), the rod-ball heterostructures of TiO 2 (R)/C-TiO 2 (A) were formed and exhibited enhanced simulated sunlight-driven photocatalytic desulfurization performance. According to the results, the desulfurization rate of TiO 2 (R)/C-TiO 2 (A) was 93.98% after 60 min, which is higher than C-TiO 2 (A) and TiO 2 (R)/TiO 2 (A). In addition, the photocatalytic recyclability test indicated that after three times the reuse of TiO 2 (R)/C-TiO 2 (A) could still reach 85.98%. The enhanced photocatalytic performance could be attributed to the double Z-scheme heterojunction in the TiO 2 (R)/C-TiO 2 (A) and the uniformly structure of rod array, which resulted in the higher separation efficiency of electrons and holes. Furthermore, the results of photocatalytic active radical species trapping experiments showed that the main substances in the photocatalytic reaction are ∙O 2 − and h + . This paper also established the double Z-scheme heterojunction reaction mechanism.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 16
·期 8
·10770-10778
·
IF 9.9
Guan Renquan,Cheng Xueying,Chen Yunning,Wu Zhengkai,Zhao Zhao,Shang Qingkun,Sun Yingnan,Sun Zaicheng
Ammonia is an important chemical raw material and non-carbon-based fuel. Photocatalytic ammonia production technology as a mild alternative to the traditional Harbor–Bosch route is carried out at the air, liquid, and solid three-phase interface. Promoting the activation of N 2 , depressing hydrogen evolution reaction (HER), and increasing the local N 2 concentration around the catalyst surface are critical factors in achieving high conversion efficiency. In this paper, we proposed that defective TiO 2 is surface-modified by alkyl acids with different carbon chain lengths (C 2 , C 5 , C 8 , C 11 , and C 14 ) to tune the catalyst surface properties. The defect sites greatly promote N 2 adsorption and activation. The wettability of the catalyst can be regulated from hydrophilic to hydrophobic by the length of the alkyl chain. The hydrophobic surface enhances the N 2 adsorption and increases the local N 2 concentration due to its aerophile. Meanwhile, it depresses the proton adsorption and HER. Overall, the nitrogen reduction reaction (NRR) is greatly promoted. Among the series of samples, they present a systematic change and have a maximal NRR performance for n-octanoic acid-defective TiO 2 (C 8 -Vo-TiO 2 ; Vo = oxygen vacancy). The rate of ammonia production can be as high as 392 µmol·g −1 h −1 . This work provides a new strategy for efficient ammonia synthesis at the three-phase interface using photocatalyst technology.
研究领域:
光催化
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材料科学
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化学工程
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环境科学
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表面化学
✓ 已验证
DOI
高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 10
·e202200324
·
IF 3.82
Hualun Li,Tian Chen,Wei Wang,Guandao Gao,Zhenda Lu
Graphical Developing an effective material to recover lithium from salt-lake brines or used batteries is highly demanded. We report a reduced TiO 2 nanomaterial with numerous lithium vacancies by lithiothermic reaction, exhibiting a high Li-ion adsorption capacity of 26 mg/g from solution. Considering the growing lithium demand and the potential shortage of lithium resource, developing an effective material to recover lithium from salt-lake brines or used batteries is highly needed. Here, we report a reduced TiO 2 nanomaterial (LiTiO 2 ) with numerous lithium vacancies by lithiothermic reaction, which exhibited high adsorption capacity of 26 mg/g from lithium-ion solution.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 4
·1295-1302
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IF 2.6
Wang Xu,Xu Gen,Zhou Zhiwei,Qin Xiaojuan,Su Yuansha,Zhang Xianbin,Wu Wenliang
New Cu 2 O@TiO 2 core-shell microspheres were successfully prepared for the first time in this paper. The XRD, N 2 adsorption-desorption, SEM, TEM, EDX and XPS characterizations were utilized to investigate the physical and chemical properties. The liquid phase oxidation of naphthalene was also carried out to test their catalytic performance. The characterization results indicating that the Cu 2 O microspheres were firstly formed by hydrothermal treatment and the rutile TiO 2 coating on the surface would be formed by the hydrolysis of tetrabutyl titanate. The Cu 2 O@TiO 2 - 5.0 catalyst with the molar ratio of copper to titanium species as high as 5.0 has the largest surface area and maximum pore volume resulting from the integrated microspheres with rougher surface thickness of about 6.3 nm, and it showed higher catalytic performance in the liquid phase oxidation of naphthalene. Naphthalene conversion of 43.2%, 1, 4-naphthoquinone selectivity of 26.7% and phthalic anhydride selectivity of 53.4% can be obtained, and it only slightly decreased even after repeated use for 5 times. The method would provide a valuable theoretic reference for the hindrance of Cu 2 O rapid deactivation and the industrial application of the naphthalene oxidation to produce high valuable chemicals.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yang Li,Zhaojian Zeng,Yuanming Zhang,Yong Chen,Wenjing Wang,Xiaoming Xu,Mengyang Du,Zhaosheng Li,Zhigang Zou
Photothermal catalytic reduction of CO2 is a powerful way to promote carbon neutralization goals. However, there are few reports on the deactivation of the photothermal CO2 reduction reaction. Here, we observed an interesting deactivation phenomenon of photothermal CO2 conversion over TiO2–xHx (black TiO2). Despite the presence of a reducing atmosphere of H2, the oxygen vacancy concentration of TiO2–xHx is reduced, resulting in the deactivation of photothermal CO2 reduction. After Ni is modified onto TiO2–xHx, Ni can activate H2 to form Hs, and the oxygen vacancy concentration of Ni/TiO2–xHx may be maintained, thus solving the deactivation problem in photothermal CO2 hydrogenation.
研究领域:
化学工程
·
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 3
·1245-1254
·
IF 2.8
Wang Kunjie,Han Sha,Liang Lei,Li Hongxia,Niu Xiaohui,Zhang Deyi,Fan Haiyan,Liu Xiaoyu
A ternary composite material containing TiO 2 , Bi 2 WO 6 , and carbon quantum dots (CQDs) was synthesized in this work. Herein, CQDs were derived from olive leaves using reflux method, and TiO 2 was loaded through hydrothermal treatment. The as-prepared composite (Bi 2 WO 6 /CQDs/TiO 2 ) showed excellent photocatalytic properties. The structure, morphology, and chemical composition of Bi 2 WO 6 /CQDs/TiO 2 were characterized using XRD, SEM, TEM, and XPS. The photocatalytic performance of the composites showed it depends on the loading rate of CQDs. The highest degradation rate of RhB (92%) was achieved at 0.5% for CQDs. UV–vis DRS, photocurrent, and PL analysis results showed that, compared to Bi 2 WO 6 and CQDs/TiO 2 binary composite, the ternary composite Bi 2 WO 6 /CQDs/TiO 2 -0.5 exhibited better visible light response, higher photogenerated carrier separation efficiency, and consequently superior photocatalytic degradation performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Weiyu Song,Kuichao Yu,Xiangyang Ji,Bowen Liu,Zhi Li,Yanjun Chen,Jian Liu
Low-cost, environmentally friendly, and highly efficient catalysts are urgently needed for the direct propane dehydrogenation (PDH) to propylene. Studies have shown that defective TiO2 obtained by in situ reduction shows excellent catalytic PDH performance. Doping metals in the lattice of TiO2 is a plausible method for tuning the vacancy content and electronic property. In this paper, doping with fifth period transition metals was screened using a computational method, followed by experimental synthesis to further improve the PDH activity of TiO2-based catalysts. The TiO2 (101) surface with doping metals was first studied to determine the positive effect on the vacancy formation. Then, the two disputed reaction paths, that is, the concerted and stepwise path, were compared extensively on all of the doping models. Step one is found to be more preferable for all. The microkinetic modeling was employed to obtain the turnover frequency (TOF), based on which the linear relationship is found for TOF and binding energy of dissociated H2 or co-adsorption energy of 2-propyl&H. The abovementioned screening process shows Ru-doped TiO2, which shows the highest PDH activity and is justified by experimental results.
研究领域:
催化
·
材料科学
·
化学工程
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Zhun Zhou,Xiaozhong Li,Jinjun Li,Zhixiong You
In the present study, CO 2 methanation with Ru nanoparticles loaded onto three TiO 2 nanocrystal supports (TiO 2 anatase with both exposed (001) facets and oxygen vacancies , TiO 2 anatase with exposed (001) facets and general TiO 2 anatase) was demonstrated. The three samples were denoted as Ar700-R, 700-R and Ana-R, respectively. XRD results confirmed that Ar700-R and 700-R sample exposed (001) facets, XPS and EPR results demonstrated the presence of oxygen vacancies on the surface of Ar700-R. In tests of CO 2 methanation activity, Ar700-R showed the highest CO 2 conversion efficiency of 75% and CH 4 formation rate of 18.84 μmol•g −1 •s −1 (GHSV = was 21600 ml•h −1 •g −1 ) at 400 °C. The enhanced CO 2 methanation activity of Ar700-R was attributed to the co-activity achieved by exposing (001) facets and oxygen vacancies on the surfaces of TiO 2 nanocrystal supports.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）