Chemoselective Hydrogenation of Cinnamaldehyde over Tailored Oxygen Vacancy Rich Pd@ZrO2 Catalyst

2021 ◽  
Author(s):  
Komal N. Patil ◽  
Divya Prasad ◽  
Jayesh T. Bhanushali ◽  
Bhalchandra Kakade ◽  
Arvind H. Jadhav ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Selective Hydrogenation ◽  
Oxygen Vacancies ◽  
Synthesis Method ◽  
Chemoselective Hydrogenation ◽  
Zro2 Catalyst ◽  
Industrial Relevance

Selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde is captivating due to its industrial relevance. Herein, two-step synthesis method was adopted to develop oxygen vacancies in Pd@ZrO2 catalysts. The oxygen vacancies were...

scholarly journals A Highly Active Au/In2O3-ZrO2 Catalyst for Selective Hydrogenation of CO2 to Methanol

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1360
Author(s):  
Zhe Lu ◽  
Kaihang Sun ◽  
Jing Wang ◽  
Zhitao Zhang ◽  
Changjun Liu
Keyword(s):  
Solid Solution ◽  
Selective Hydrogenation ◽  
Solution Structure ◽  
Oxygen Vacancies ◽  
Co2 Adsorption ◽  
Gold Catalyst ◽  
Co2 Hydrogenation ◽  
Highly Active ◽  
Zro2 Catalyst ◽  
Space Time Yield

A novel gold catalyst supported by In2O3-ZrO2 with a solid solution structure shows a methanol selectivity of 70.1% and a methanol space–time yield (STY) of 0.59 gMeOH h−1 gcat−1 for CO2 hydrogenation to methanol at 573 K and 5 MPa. The ZrO2 stabilizes the structure of In2O3, increases oxygen vacancies, and enhances CO2 adsorption, causing the improved activity.

In situ synthesis of Cl-doped Bi2O2CO3 and its enhancement of photocatalytic activity by inducing generation of oxygen vacancies

2020 ◽  
Vol 7 (16) ◽  
pp. 2969-2978
Author(s):  
Jie-hao Li ◽  
Jie Ren ◽  
Ying Liu ◽  
Hui-ying Mu ◽  
Rui-hong Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ionic Liquids ◽  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
In Situ Synthesis ◽  
Photocatalytic Mechanism

Cl-Doped Bi2O2CO3 is prepared using ionic liquids as dopants and the oxygen-vacancy-induced photocatalytic mechanism is revealed.

A hierarchical oxygen vacancy-rich WO3 with “nanowire-array-on-nanosheet-array” structure for highly efficient oxygen evolution reaction

2019 ◽  
Vol 7 (12) ◽  
pp. 6730-6739 ◽  
Author(s):  
Jinxiang Diao ◽  
Wenyu Yuan ◽  
Yu Qiu ◽  
Laifei Cheng ◽  
Xiaohui Guo
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Evolution Reaction ◽  
Oxygen Vacancies ◽  
State Of The Art ◽  
Nanowire Array ◽  
Nanowire Arrays ◽  
Nanosheet Array ◽  
Nanosheet Arrays ◽  
Array Structure ◽  
First Time

Hierarchical vertical WO3 nanowire arrays on vertical WO3 nanosheet arrays with rich oxygen vacancies were synthesized via a simple and facile method, and the outstanding OER performance which is superior to that of most reported state-of-the-art catalysts was reported for the first time.

Highly dispersed rhodium atoms supported on defect-rich Co(OH)2 for chemoselective hydrogenation of nitroarenes

2021 ◽  
Author(s):  
Huan Fu ◽  
Huan Zhang ◽  
Guichun Yang ◽  
Jun Liu ◽  
Junyuan Xu ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Chemoselective Hydrogenation ◽  
Highly Dispersed

The 0.54%(Pt, Rh, Pd or Ru)/Co(OH)2, 1.23%Rh/Co(OH)2 catalysts were successfully synthesized by simple hydrothermal and precipitation methods for nitroarenes selective hydrogenation, it was found that 0.54%Rh/Co(OH)2 outperformed other catalysts, for...

Oxygen vacancy induced electron traps in tungsten doped Bi2MoO6 for enhanced photocatalytic performance

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chang Sun ◽  
Zitong Zhao ◽  
Hougang Fan ◽  
Yanli Chen ◽  
Xiaoyan Liu ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Recombination Rate ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Electron Trap ◽  
Electron Traps

As the concentration of the W dopant increased in the Bi2Mo1−xWxO6 nanosheets, the density of the oxygen vacancies became higher, which served as electron trap centers to lower the recombination rate and enhance the photocatalytic performance.

Engineering the geometric and electronic structure of Ru via Ru-TiO2 interaction for enhanced selective hydrogenation

2022 ◽  
Author(s):  
Jian-guo Wang ◽  
Qiang Zhou ◽  
Zijiang Zhao ◽  
Zihao Yao ◽  
Zhongzhe Wei ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Chemical Reactions ◽  
Selective Hydrogenation ◽  
Oxygen Vacancies ◽  
Reduction Method ◽  
Support Interaction ◽  
Important Chemical ◽  
Metal Support Interaction ◽  
Metal Support

Modulation of the metal-support interaction plays a key role in many important chemical reactions. Here, by adjusting the reduction method of the catalyst and introducing oxygen vacancies in TiO2 to...

Oxygen vacancy migration in CSZ using density functional theory

2008 ◽  
Vol 1122 ◽  
Author(s):  
Byeong-Eon Lee ◽  
Dae-Hee Kim ◽  
Yeong-Cheol Kim
Keyword(s):  
Density Functional Theory ◽  
Oxygen Vacancy ◽  
Density Functional ◽  
Oxygen Vacancies ◽  
Nearest Neighbor ◽  
Functional Theory ◽  
The Third ◽  
Vacancy Migration ◽  
Neighbor Site ◽  
Formation Energies

AbstractWe studied oxygen migration in calcia-stabilized cubic zirconia (CSZ) using density functional theory. A Ca atom was substituted for a Zr atom in a 2×2×2 ZrO2 cubic supercell, and an oxygen vacancy was produced to satisfy the charge neutrality condition. We found that the formation energies of an oxygen vacancy, as a function of its location with respect to the Ca atom, were varied. The relative formation energies of the oxygen vacancies located at the first-, second-, third-, and fourth-nearest-neighbors were 0.0, −0.07, 0.19, and 0.19 eV, respectively. Therefore, the oxygen vacancy located at the second-nearest-neighbor site of the Ca atom was the most favorable, the oxygen vacancy located at the first-nearest-neighbor site was the second most favorable, and the oxygen vacancies at the third- and fourth-nearest-neighbor sites were the least favorable. We also calculated the energy barriers for the oxygen vacancy migration between oxygen sites. The energy barriers between the first and the second nearest sites, the second and third nearest sites, and the third and fourth nearest sites were 0.11, 0.46, and 0.23 eV, respectively. Therefore, the oxygen vacancies favored the first- and second-nearest-neighbor oxygen sites when they drifted under an electric field.

The Effect of Oxygen Vacancies on the Dielectric Responses of BaTiO3 Based Ceramics in the Ultra-Wide Frequency Range

2011 ◽  
Vol 485 ◽  
pp. 15-18 ◽  
Author(s):  
Youn Kyu Choi ◽  
Takuya Hoshina ◽  
Hiroaki Takeda ◽  
Jong Min Oh ◽  
Takaaki Tsurumi
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
Wide Frequency Range ◽  
Annealing Conditions ◽  
Mass Fractions ◽  
Xrd Patterns ◽  
Effect Of Oxygen ◽  
Lattice Hardening ◽  
Dipole Polarization ◽  
Ionic Polarization

The effect of oxygen vacancies and their migrations on the dielectric responses of BaTiO3 (BT) ceramics and (Ba, Ca)(Ti, Zr)O3 (BCTZ) ceramics was studied using wideband dielectric spectroscopy. Both dipole and ionic polarization of BT ceramics after annealing in a reducing atmosphere markedly decreased. To elucidate the decrease of dipole and ionic polarization, we observed the domain width and the crystal structure of BT ceramics annealed in different PO2. The mass fractions of constituted phases in 90o domain were calculated using the refinement of XRD patterns to explain the degradation of ionic polarization by oxygen vacancies. From the results above, we judged that the decrease of dipole polarization was due to the domain wall clamping by oxygen vacancies, while that of ionic polarization was attributable to the lattice hardening by the incorporation of oxygen vacancies into the BT lattice. In the case of BCTZ ceramics, dipole polarization showed the same way as BT ceramics with annealing conditions but the ionic polarization was independent of PO2 in annealing because of anti-reducing behavior of BCTZ ceramics. On the basis of the effect of oxygen vacancy in BT ceramics and BCTZ ceramics, we could clarify the oxygen vacancy migration in BCTZ ceramics under high direct-current voltage (DCV).

scholarly journals Effects on Microstructure and Ionic Conductivity of the Co-Doping with Strontium and Samarium of Ceria with Constant Oxygen Vacancy Concentration

Solids ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 341-370
Author(s):  
Toby Sherwood ◽  
Richard T. Baker
Keyword(s):  
Oxygen Vacancy ◽  
Grain Boundary ◽  
Vacancy Concentration ◽  
Synthesis Method ◽  
Ionic Conductivities ◽  
Solubility Limit ◽  
Material Structure ◽  
Oxygen Vacancy Concentration ◽  
Co Doping ◽  
Phase Pure

Partially substituted cerias are attractive materials for use as electrolytes in intermediate-temperature solid oxide fuel cells (SOFCs). Ceria doped with Sm or Gd has been found to have high ionic conductivities. However, there is interest in whether doping with multiple elements could lead to materials with higher ionic conductivities. The present study looks at the effects of co-doping Sr and Sm in ceria. A compositional series, Ce0.8+xSm0.2−2xSrxO2−δ (with x = 0–0.08), designed to have a constant oxygen vacancy concentration, was successfully prepared using the citrate–nitrate complexation method. A solubility limit of ~5 cation% Sr was found to impact material structure and conductivity. For phase-pure materials, with increasing Sr content, sinterability increased slightly and intrinsic conductivity decreased roughly linearly. The grain boundaries of phase-pure materials showed only a very small blocking effect, linked to the high-purity synthesis method employed, while at high %Sr, they became more blocking due to the presence of a SrCeO3 impurity. Grain capacitances were found to be 50–60 pF and grain boundary capacitances, 5–50 nF. The variation in the bulk capacitance with Sr content was small, and the variation in grain boundary capacitance could be explained by the variation in grain size. Slight deviations at high %Sr were attributed to the SrCeO3 impurity. In summary, in the absence of deleterious effects due to poor microstructure or impurities, such as Si, there is no improvement in conductivity on co-doping with Sr and Sm.

scholarly journals Enhancing the photocatalytic hydrogen production activity of BiVO4 [110] facets using oxygen vacancies

RSC Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 540-545
Author(s):  
Jing Pan ◽  
Xiaoxue Ma ◽  
Wannian Zhang ◽  
Jingguo Hu
Keyword(s):  
Hydrogen Production ◽  
Oxygen Vacancy ◽  
Electric Field ◽  
Oxygen Vacancies ◽  
Internal Electric Field ◽  
Photocatalytic Hydrogen Production ◽  
Production Activity

An oxygen-vacancy-induced internal electric field enhances the photocatalytic hydrogen production activity of a BiVO4 [110] facet.

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