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Wang M, Li W, Wang S, Shi Z. Lattice Oxygen Lability of La-Hexaaluminates Substituted by Different Metals and Their Effects on the Thermal Stability of Supported Nano-Ir Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:285-294. [PMID: 36538497 DOI: 10.1021/acs.langmuir.2c02486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Oxide supports with high lattice oxygen lability can stabilize the supported nanoparticles at high temperatures. The lattice oxygen lability of lanthanum hexaaluminates (LHAs) substituted with other metals (such as Mg and Fe) as well as their effects on the thermal stability of supported Ir particles were investigated via CO chemisorption, hydrogen temperature-programmed reduction (H2-TPR), oxygen temperature-programmed desorption (O2-TPD), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma (ICP), and scanning electron microscopy/transmission electron microscopy (SEM/TEM) techniques. The H2-TPR results showed that the lattice oxygen lability of lanthanum iron hexaaluminate (LFA) was much higher than that of lanthanum magnesium hexaaluminate (LMA). This variation could be attributed to the difference in the reducibility of Fe/Mg atoms and their substitution sites in the crystallographic lattice. Under the reductive condition, the H2-TPR presented that the amount of reducible lattice oxygen of LFA supported by metallic Ir decreased significantly, implying the existence of the migration of lattice oxygen and formation of oxygen vacancies, as revealed by O2-TPD and XPS results. After thermal aging at 1200 °C, the amount of residual Ir in LFA was about 4 times that of LMA, as shown in the ICP results. The mean size and dispersion of Ir particles in LFA were better than those in LMA, as revealed by the SEM/TEM results, showing the superior thermal stability of the Ir particles in LFA support. Hence, this study concludes that the lattice oxygen lability plays an important role in improving the thermal stability of the Ir@LHAs at high temperatures. Based on characterization results, a model was proposed to explain the interaction between Ir and LHAs and its effect on the thermal stability of the Ir particles.
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Affiliation(s)
- Mengyu Wang
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha410073, P.R. China
| | - Wei Li
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha410073, P.R. China
| | - Song Wang
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha410073, P.R. China
| | - Zhihong Shi
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha410073, P.R. China
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Liu B, Nakagawa Y, Li C, Yabushita M, Tomishige K. Selective C–O Hydrogenolysis of Terminal C–OH Bond in 1,2-Diols over Rutile-Titania-Supported Iridium-Iron Catalysts. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Ben Liu
- Department of Applied Chemistry, School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - Yoshinao Nakagawa
- Department of Applied Chemistry, School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
- Research Center for Rare Metal and Green Innovation, Tohoku University, 468-1, Aoba, Aramaki, Aoba-ku, Sendai 980-0845, Japan
| | - Congcong Li
- Department of Applied Chemistry, School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - Mizuho Yabushita
- Department of Applied Chemistry, School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
- Research Center for Rare Metal and Green Innovation, Tohoku University, 468-1, Aoba, Aramaki, Aoba-ku, Sendai 980-0845, Japan
| | - Keiichi Tomishige
- Department of Applied Chemistry, School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
- Research Center for Rare Metal and Green Innovation, Tohoku University, 468-1, Aoba, Aramaki, Aoba-ku, Sendai 980-0845, Japan
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
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Layered double hydroxide-like Mg 3 Al 1−x Fe x materials as supports for Ir catalysts: Promotional effects of Fe doping in selective hydrogenation of cinnamaldehyde. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(18)63042-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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UV Light-Assisted Synthesis of Highly Efficient Pd-Based Catalyst over NiO for Hydrogenation of o-Chloronitrobenzene. NANOMATERIALS 2018; 8:nano8040240. [PMID: 29662004 PMCID: PMC5923570 DOI: 10.3390/nano8040240] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 04/06/2018] [Accepted: 04/07/2018] [Indexed: 11/28/2022]
Abstract
Supported Pd-based catalyst over active nickel oxide (NiO) was repared using the impregnation method companying with UV-light irradiation. Moreover, the catalytic performance of the obtained Pd-based catalysts was evaluated towards the hydrogenation of o-chloronitrobenzene (o-CNB). Observations indicate that the as-prepared UV-irradiated Pd/NiO catalyst with a mole fraction 0.2% (0.2%Pd/NiO) has higher activity and selectivity in the o-CNB hydrogenation. Especially, UV-light irradiation played a positive role in the improvement of catalytic activity of 0.2%Pd/NiO catalyst, exhibiting an excess 11-fold activity superiority in contrast with non-UV-irradiated 0.2%Pd/NiO catalyst. In addition, it was investigated that effects of varied factors (i.e., reaction time, temperature, o-CNB/Pd ratio, Pd loading, hydrogen pressure) on the selective hydrogenation of ο-CNB catalyzed by UV-irradiated 0.2%Pd/NiO catalyst. Under the reaction conditions of 60 °C, 0.5 h, 1 MPa H2 pressure, 100% conversion of o-CNB, and 81.1% o-CAN selectivity were obtained, even at high molar ratio (8000:1) of o-CNB to Pd.
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A Novel Synthesis of Gold Nanoparticles Supported on Hybrid Polymer/Metal Oxide as Catalysts for p-Chloronitrobenzene Hydrogenation. J CHEM-NY 2017. [DOI: 10.1155/2017/7941853] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
This contribution reports a novel preparation of gold nanoparticles on polymer/metal oxide hybrid materials (Au/P[VBTACl]-M metal: Al, Ti or Zr) and their use as heterogeneous catalysts in liquid phase hydrogenation of p-chloronitrobenzene. The support was prepared by in situ radical polymerization/sol gel process of (4-vinyl-benzyl)trimethylammonium chloride and 3-(trimethoxysilyl)propyl methacrylate in conjunction with metal-alkoxides as metal oxide precursors. The supported catalyst was prepared by an ion exchange process using chloroauric acid (HAuCl4) as gold precursor. The support provided the appropriate environment to induce the spontaneous reduction and deposition of gold nanoparticles. The hybrid material was characterized. TEM and DRUV-vis results indicated that the gold forms spherical metallic nanoparticles and that their mean diameter increases in the sequence, Au/P[VBTACl]-Zr > Au/P[VBTACl]-Al > Au/P[VBTACl]-Ti. The reactivity of the Au catalysts toward the p-CNB hydrogenation reaction is attributed to the different particle size distributions of gold nanoparticles in the hybrid supports. The kinetic pseudo-first-order constant values for the catalysts in the hydrogenation reaction increases in the order, Au/P[VBTACl]-Al > Au/P[VBTACl]-Zr > Au/P[VBTACl]-Ti. The selectivity for all the catalytic systems was greater than 99% toward the chloroaniline target product. Finally the catalyst supported on the hybrid with Al as metal oxide could be reused at least four times without loss in activity or selectivity for the hydrogenation of p-CNB in ethanol as solvent.
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Yu W, Lou LL, Li S, Ma T, Ouyang L, Feng L, Liu S. Highly efficient and durable platinum nanocatalysts stabilized by thiol-terminated poly(N-isopropyl acrylomide) for selective hydrogenation of halonitrobenzene to haloaniline. RSC Adv 2017. [DOI: 10.1039/c6ra24773c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thermosensitive polymer PNIPAM-SH stabilized Pt nanocatalyst was firstly applied in the selective hydrogenation of halonitrobenzenes to haloanilines and exhibited notably high and steady selectivity as well as high durability.
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Affiliation(s)
- Wenjun Yu
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
| | - Lan-Lan Lou
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
| | - Shanshan Li
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
| | - Tianyuan Ma
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
| | - Lezi Ouyang
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
| | - Li Feng
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
| | - Shuangxi Liu
- Institute of New Catalytic Materials Science and Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- School of Materials Science and Engineering
- Nankai University
- Tianjin 300350
- China
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8
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Iihama S, Furukawa S, Komatsu T. Efficient Catalytic System for Chemoselective Hydrogenation of Halonitrobenzene to Haloaniline Using PtZn Intermetallic Compound. ACS Catal 2015. [DOI: 10.1021/acscatal.5b02464] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sho Iihama
- Department of Chemistry,
Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan, 185-8551
| | - Shinya Furukawa
- Department of Chemistry,
Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan, 185-8551
| | - Takayuki Komatsu
- Department of Chemistry,
Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan, 185-8551
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