Catalysts
·
2020
·Vol. 10
·期 3
·312
·
IF 3.52
Zhiwen Xi,Zhe Hong,Fangtao Huang,Zhirong Zhu,Wenzhi Jia,Junhui Li
A series of Pt/WOx-ZrO2-TiO2catalysts with different Ti/Zr molar ratios was prepared by an evaporation induced self-assembly method, and used to efficient hydrogenolysis of glycerol to 1-PO and 1,3-PDO. BET, XRD, Raman, TEM, XPS and Py-IR were employed to characterize the physicochemical properties of the catalysts. The structural and acidic properties of the catalysts were affected by the Ti/Zr ratio of the support ZrO2-TiO2. Two new crystalline phases of ZrTiO4and Ti2ZrO6and the amount of acid sites were detected in the Pt/WOx-ZrO2-TiO2catalysts. 1-PO is dominant in all products of glycerol hydrogenolysis over the supported Pt-WOx catalysts, which is attributed to more Lewis acid sites on the catalyst surface. The Pt/WOx-ZrO2-TiO2catalyst with a Ti/Zr ratio of 7/3 showed the highest 1,3-PDO yield (25.3%) and 1-PO yield (42.3%), due to its more acid sites including Brønsted and Lewis, and higher concentration of surface Pt0.Keywords:hydrogenolysis of glycerol;1,3-propanediol;1-propanediol;Pt-WOx;ZrO2-TiO2
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 8
·2101603
·
IF 4.122
Jianhong Dong,Yongshuai Xie,Lixin Liu,Zhezhe Deng,Wei Liu,Luyi Zhu,Xinqiang Wang,Dong Xu,Guanghui Zhang
Low density, heat-resistant sponge-like fiber assembly materials are considered as promising high-temperature insulation materials. However, the poor structural stability, infrared radiation heat transfer, and complex preparation process limit its further application. Herein, a facile method to create ultralow-density ZrO 2 –TiO 2 fiber sponges by the electrospinning method followed by heat treatment is presented. The layered structure sponges treated at 1200 °C have a low density of 9.5 mg cm −3 . Moreover, the sponges possess high compressibility and good compression resistance over a wide temperature range from −196 to 1200 °C. In addition, the sponges exhibit low thermal conductivity of 27 mW m −1 K −1 , robust fire resistance, and high near-infrared reflectance, making them an ideal alternative for high-temperature thermal insulation materials.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 1
·124-137
·
IF 2.482
Xi Zhiwen,Jia Wenzhi,Zhu Zhirong
Abstract Two series of WO 3 –ZrO 2 and WO 3 –ZrO 2 –TiO 2 composite oxides were prepared via an Evaporation Induced Self Assembly (EISA) method and applied for the hydrogenolysis of glycerol after loading with Pt. Several techniques like XRD, BET, Raman spectroscopy, NH 3 -TPD, Py-IR, TEM and XPS were adopted to characterize the physicochemical properties of the as-synthesized catalysts. The structure and catalytic activities of these catalysts were significantly affected by the calcination temperature of the composite oxides. The introduction of TiO 2 into Pt/WO 3 –ZrO 2 could inhibit the drastic decrease in catalytic performance due to the formation of inactive crystalline WO 3 under high calcination temperature of 800 ℃. A maximum activity was obtained on the Pt/WO 3 –ZrO 2 –TiO 2 catalyst when the calcination temperature was 600 ℃, which gave 73.8% glycerol conversion and 25.4% 1,3-propanediol yield. While the Pt/WO 3 –ZrO 2 catalyst only exhibited 53.4% glycerol conversion and 20.2% 1,3-propanediol yield. The enhanced activity of Pt/WO 3 –ZrO 2 –TiO 2 was ascribed to the improved acidity originating from (i) higher acidic properties of WO x species when linked to Ti with larger electronegativity other than Zr and (ii) new acid centers caused by heteroatoms linkage as the combination of ZrO 2 and TiO 2 . The effects of Pt loading amount and reaction temperatures were also investigated. Graphic Abstract
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 7
·e7133
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IF 3.9
Xiaoyi Shi,Yujie Guo,Zhihao Li,Meng He,Zhengdong Zhu,Xu Sun,Hui Sun,Maofeng Zhang,Jianhua Li,Youju Huang
Rapid identification and analysis of pesticide residue on real-world sample by a portable platform is of growing interest for monitoring food safety and safeguarding human health. Herein, we developed a robust surface-enhanced Raman spectroscopy (SERS) sensor based on ZrO 2 @TiO 2 /Ag substrate for the analysis of pesticide residues. The synergetic effects of the metal organic framework (MOF)-derived porous ZrO 2 @TiO 2 heterostructure induced charge transfer enhancement and the electromagnetic enhancement from the plasmonic silver nanoparticles (AgNPs) hotspot generate significant SERS enhancement signal. The SERS substrate exhibits superior long-term stability and signal homogeneity for SERS quantitative analysis. The platform has the capability to detect not only model molecule of 4-ATP but also pesticides of triazophos and fonofos at the extremely low concentration of 10 −8 M. Moreover, we simulate the quantitative detection of pesticide residue on real objects by spraying pesticides on dendrobium and chrysanthemum leaves, followed by transferring to the SERS platform to perform analysis. The nearly linear fitting curve with a wide concentration range suggests the superior qualitative detection capability. Remarkably, two components and three components of the pesticides are readily identified in a rapid way. The approach provides the rapid analysis, low-cost device, and portable and quantitative pesticide identification and offers a clear path to multicomponent analysis at a trace level.
研究领域:
分析化学
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食品安全
✓ 已验证
产品关联
DOI
高影响因子
Journal of Natural Gas Chemistry
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2012
·
IF 1.348
Lincai Peng,Junping Zhuang,Lu Lin
Effects of Zr/Ti molar ratio in SO 2− 4 /ZrO 2 -TiO 2 solid acid catalyst calcined at different temperatures on its surface properties and catalytic activity were thoroughly investigated in this paper. The physicochemical characteristics of prepared samples were determined by N2 adsorptiondesorption, XRD, NH3-TPD and XPS techniques, respectively. It was found that the crystallization temperature of the samples increased after the combination of ZrO 2 and TiO 2 ; and phase transformations from the anatase to the rutile of TiO 2 species and the tetragonal to the monoclinic of ZrO 2 species were effectively suppressed at higher temperature. The sample with a Zr/Ti molar ratio of 3/1 calcined at 450 °C showed the highest surface area and the most acid sites among all the tested samples. The acid site densities of samples were relatively closed to each other if they were calcined at the same temperature, however, decreased with the calcination temperature. The result indicates that the sulfur content in samples is a crucial factor to control the acid site density. Calcining the sample at 650 °C and higher temperatures resulted in a significant desorption of sulfate ion on the samples. The synthesized samples were evaluated as a potential catalyst for glucose conversion under the near-critical methanol conditions (200 °C/4 MPa). The results suggested that the relatively weaker acid sites of the catalyst were more favorable for the accumulation of methyl glucosides, while the moderate acid sites were responsible for the formation of methyl levulinate. The catalytic activity for methyl levulinate production almost increases linearly with the catalyst acid site density. The catalyst deactivation is due to the loss of sulfate ion and the two catalysts with Zr/Ti molar ratios of 3/1 and 1/3 could effectively alleviate the deactivation caused by sulfate solution in the reaction medium and can be reused after calcination with the reuse rate of over 90% in terms of the methyl levulinate selectivity.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2016
·
IF 2.75
Chen-Hao Ji,Shuang-Mei Xue,Zhen-Liang Xu,Xiao-Hua Ma
In this work, a novel hollow fiber catalytic packing (HFCP) was fabricated of ZrO 2 (shell)/TiO 2 (core) (TZ) solid superacid nanoparticles , perfluorinated sulfonic acid resin (PFSA) and polyethersulfone (PES) via wet-spinning method. TZ was a homemade binary solid superacid nanoparticles with core–shell structure using superfine titania (5 nm) as the core and mesoporous tetragonal phase zirconia as the shell. It was synthesized through the hydrolysis of zirconium oxychloride in the presence of titania nanoparticles and cetyltrimethylammonium bromide (CTAB) hexagonal crystals covered on the titania core and followed by calcination and acidification. HFCPs demonstrated well catalytic performance in the esterification test of ethanol and acetic acid due to the superacid sites on the surface of TZ and PFSA polymer chain. And the superacid sites on the PFSA polymer chain could be sufficiently exposed by the embedding of the nanoparticles. At the same time, HFCPs also showed ultrahigh recovery which was more than 99.5% in 6 runs because of the well integrality benefited from the wet-spinning method. The specific surface area (SSA) and pore size distribution were analyzed by N 2 adsorption–desorption, the result showed that the SSA of HFCPs decreased with the increasing of the PFSA additive amount. The SSA of the HFCP with the best catalytic performance could be up to 90.60 m 2 /g, in which the PFSA weight proportion was 13%. The XRD pattern and HRTEM image showed the HFCPs i.e. the zirconia shell of TZ formed uniform tetragonal phase. Other characterizations such as FT-IR, XPS, SEM and TEM were utilized to determine the chemical composition and morphology of the HFCPs and TZ, the results showed the novel catalytic packing was a suitable catalyst for the acid catalyzed reactions.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Mingming Fan,Zhikun Si,Wenjuan Sun,Pingbo Zhang
Two types of efficient and novel sulfonated ZrO 2 -TiO 2 nanorods solid acid catalysts, designed as ZrO 2 -TiO 2 -SO 3 H nanorods and ZrO 2 -TiO 2 @SO 4 2− nanorods, were prepared for the production of biodiesel by esterification of palmitic acid. The ZrO 2 -TiO 2 nanorods were used as carrier and sulfonated by two different methods: post-gifting method and impregnation method. These catalysts were characterized by FT-IR, Pyridine-FT-IR SEM, TEM, EDS, BET, TGA and XRD to study their properties. The results indicated that the morphologies of ZrO 2 -TiO 2 nanocomposites were unique nanorods. The two catalysts had high content of sulfate groups, which were demonstrated by the weight ratio of S/(Zr + Ti) and obvious peaks of Brønsted acid sites. As the results, ZrO 2 -TiO 2 -SO 3 H and ZrO 2 -TiO 2 @SO 4 2− revealed strong catalytic activities in the esterification of palmitic acid. Although ZrO 2 -TiO 2 @SO 4 2− nanorods (acidity = 3.4 mmol/g) appealed stronger catalytic activity than ZrO 2 -TiO 2 -SO 3 H nanorods (acidity = 1.9 mmol/g) due to its higher acidities, ZrO 2 -TiO 2 -SO 3 H nanorods exhibited higher reusability, and the yield of biodiesel was more than 85% after 5 successive uses, which indicated that the method of sulfonation can deeply affect properties of catalysts.
✓ 已验证
DOI
高影响因子
WEAR
·
2024
·
IF 5.3
Zhihui Zhang,Jianxin Deng,Yang Lu,Jiaxing Wu,Ran Wang,Yichen Bao
In this paper, the electrojet mask in-situ forming technology was used to prepare (CF x ) n /CaF 2 -ZrO 2 /TiO 2 composite films with different ZrO 2 /TiO 2 texture distributions, to improve the adhesion properties and tribological performance of (CF x ) n /CaF 2 lubricant films. The microstructure, mechanical properties, and reciprocating wear characteristics between the composite films and 304 stainless steel counterparts were studied. The results showed that the textured hard film significantly improved the adhesion strength of the soft film and the tribological properties of the composite film. The composite film sample B had the lowest friction coefficient (∼0.100) and a lower film wear rate of ∼2.85 × 10 −7 mm 3 N −1 mm −1 , and also showed good self-lubricating properties in the high-temperature wear process. Sample C had a lower friction coefficient of ∼0.107 and the lowest film wear rate of ∼2.75 × 10 −7 mm 3 N −1 mm −1 . Compared with untextured composite film sample DC, sample B showed a 21.3 % reduction in friction coefficient, while sample C showed a 54.8 % decrease in film wear rate. This was because the surface texturing treatment of hard films enhanced the storage and flow of lubricant particles, and maintained a stable self-lubricating film during reciprocating wear. Moreover, (CF x ) n and CaF 2 have a synergistic effect in a wide temperature range of 25 °C–600 °C.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2025
·
IF 5.3
Yaoyi Hu,Xiqiang Yuan,Zhengquan Zhang,Yu Zhang,Han Ma,Yunfei He,Shaoyun Shan,Tianding Hu
Natural borneol has enormous medicinal value (like clearing heat, detoxifying, relieving pain, and other effects) but has a low yield and high price. Compared with the natural extraction method to obtain borneol, a synthetic method has significant advantages such as high yield, environmental protection, and high economic benefits. In the synthesis method, the catalyst is the most key factor. In this study, two catalysts (SO 4 2- /ZrO 2 -TiO 2 and Al 2 (SO 4 ) 3 /ZrO 2 -TiO 2 ) with high catalytic performance and high positive selectivity were synthesized by impregnation method to synthesize borneol from α-pinene. The optimum synthesis conditions of SO 4 2- /ZrO 2 -TiO 2 were as follows: n(Zr): n(Ti) = 3: 1, sulfuric acid concentration 2 mol/L, calcination temperature 550 °C, the yield of borneol was 68.14 %. Based on the preparation of catalyst SO 4 2- /ZrO 2 -TiO 2 , the optimum synthesis conditions of Al 2 (SO 4 ) 3 /ZrO 2 -TiO 2 were as follows: the concentration of aluminum sulfate was 0.4 mol/L, the calcination temperature was 600 °C, and the yield of borneol was 74.58%, Compared with the highest yield of 59.89% reported in the existing literature, the performance is improved by 13.96%. In addition, the mechanism of the esterification and saponification reaction of borneol has been in the blank stage. We used the density functional theory (DFT) to explore the reaction mechanism.
研究领域:
有机化学
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催化化学
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药物化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Haoguang Wang,Bo Huang,Xinrui Miao,Wenli Deng
Since most superamphiphobic coatings contain fluorinated materials, finding eco-friendly alternatives is essential. In recent years, researchers have focused on integrating eco-friendly photocatalytic materials into superhydrophobic coatings to degrade organic pollutants effectively. We successfully designed a porous ZrO 2 @TiO 2 (porous ZT) photocatalyst using a combination of the solvothermal, sol–gel, and calcination methods. Porous ZT was modified with polydimethylsiloxane (PDMS) to create a kind of ZrO 2 @TiO 2 @PDMS (porous ZTP) suspension. The ZTP suspension was then sprayed onto various substrates and heated at 400 °C for 2 min to produce a porous ZrO 2 @TiO 2 @PDMS (porous H-ZTP) composite coating. The porous H-ZTP coating demonstrates extremely low surface energy (2.37 mN/m), allowing it to prevent contamination from various liquids encountered in daily life while exhibiting outstanding superhydrophobic properties (WCA > 160°, SA < 2°). Additionally, it can decompose organic substance (RhB) under light irradiation, showcasing effective physical and chemical self-cleaning abilities. After exposure to ultraviolet light, the coating can decompose oleic acid and restore its initial superhydrophobic state. Further investigation into the mechanism of photocatalytic degradation reveals that the unique heterojunction structure of the porous ZT significantly enhances its photocatalytic activity. The porous H-ZTP applied to stainless steel mesh shows excellent flux (40,000 L·h −1 m −2 ) and efficiency (99 %) for oil–water separation. This research is significant for developing and applying self-cleaning coatings that combine physical superhydrophobic and chemical photocatalytic properties.
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 79
·50027-50034
·
IF 3.108
Huizhen Wang,Wenzhi Li,Jindong Wang,Hou-min Chang,Hasan Jameel,Qi Zhang,Song Li,Lele Jin
The solid, super, acid catalyst S2O82−/ZrO2–TiO2–SiO2, which has both a strong Brønsted acid and Lewis acid, was prepared and applied in lignin depolymerization. The results indicate that S2O82−/ZrO2–TiO2–SiO2 is an effective catalyst for lignin depolymerisation since the liquid product was almost completely dissolved in ethyl acetate, indicating that it was comprised of mostly oligomeric lignin degradation products. The effect of hydrogenation co-catalysts (Pd/C, Pt/C and Ru/C, Rh/C) were also studied and found to improve the yield of aromatic compounds and the petroleum ether soluble fraction, which are mostly monomeric and dimeric products. The resulting yields of aromatic compounds and petroleum ether soluble products were 14.8% and 46%, respectively, when S2O82−/ZrO2–TiO2–SiO2 and Pt/C mixed catalyst was used at 310 °C for 24 hours. These results show that the use of a combination Brønsted and Lewis acid catalyst in combination with a hydrogenation catalyst (S2O82−/ZrO2–TiO2–SiO2 together with a noble metal catalyst) opens a practical route for efficient lignin depolymerization.
研究领域:
化学工程
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催化材料
·
可再生资源转化
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Zhihui Zhang,Jianxin Deng,Shiyao Rong,Junyan Wang,Yichen Bao
To further enhance the lubrication performance of composite coatings, this study employed an electrospray masking in-situ forming technology to fabricate textured (CF x ) n /CaF 2 /C-ZrO 2 /TiO 2 composite coatings. Their microstructures, mechanical properties, and reciprocating wear behaviors were investigated. Results showed that this technique could directly create high-quality chessboard microtextures during coating fabrication, integrating multiple materials on a single surface. Compared to non-textured LT samples, the CBM samples demonstrated enhanced coating-substrate adhesion strength (132 N, increased by 11 %), low friction coefficient (~0.09, reduced by 18.2 %) and wear rate (~1.86 × 10 −7 mm 3 ·N −1 ·mm −1 , reduced by 42.4 %) at 25 °C, and excellent self-lubricating performance across 200–600 °C. Mechanism analysis revealed that the chessboard structure exhibited a synergistic effect with the coating materials.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）