Carbon monoxide oxidation by atmospheric oxygen on catalysts prepared by pyrolysis of transition metal β-diketonates on the synthetic foam ceramics
摘要:
The results of development of new catalytic systems for the carbon monoxide oxidation to dioxide are systematized. The catalysts were produced by gas-phase thermal decomposition of the transition metal acetylacetonates on the synthetic foam ceramics. The kinetic and activation parameters of the oxidation on the catalysts were studied and their relative activity was explored. The activity of catalysts at the oxidation with air oxygen were found to depend on the nature of the deposited metal and the carrier. A synergistic effect in the bimetallic copper catalysts was revealed.
Zirconium pivalate is synthesized using an original procedure starting from hydrous zirconium oxochloride. The volatility of zirconium pivalate is characterized for the first time in the range from 130 to 210 degrees C using mass spectrometry: the enthalpies of sublimation and the vapor pressure are determined as functions of temperature. Experiments are carried out to compare the thermal stabilities of zirconium pivalate and zirconium acetylacetonate. The property of zirconium pivalate to serve as the precursor for MOCVD of zirconia films is shown.
nominal composition BaZr0.9Y0.1O3, a ceramic protonconductor, was subject to impedance spectroscopy for temperatures 300 K 1.2 GPa. The grain boundary activation energy is around a factor two times as that of the bulk, and it reaches a maximum at 1.25 - 1.5 GPa, and then decrease as the pressure increases, indicating higher protonmobility in the grain boundaries at higher pressure. Since this effect
Solution-based deposition of buffer and superconductor layers offers routes to a low-cost YBCO coated conductor technology for high temperature superconductor tapes. In this work we explore the possibility of the preparation procedure of BaZrO 3 buffer and YBCO layers on SrTiO 3 (STO) single crystal substrates by metal-organic decomposition. BaZrO 3 buffer layers have been processed on single crystal substrates
Large‐Pore Mesoporous CeO
<sub>2</sub>
–ZrO
<sub>2</sub>
Solid Solutions with In‐Pore Confined Pt Nanoparticles for Enhanced CO Oxidation
作者:Xuanyu Yang、Xiaowei Cheng、Junhao Ma、Yidong Zou、Wei Luo、Yonghui Deng
DOI:10.1002/smll.201903058
日期:2019.9
vacancies in the Ce0.8 Zr0.2 O2 framework. The simulated catalytic evaluations of CO oxidation combined with various characterizations reveal that the intrinsic high surface oxygen mobility and well-interconnected pore structure of the mesoporous Pt/Ce0.8 Zr0.2 O2catalyst are responsible for the remarkable catalytic efficiency. Additionally, compared with mesoporous Pt/Cex Zr1- x O2 -s with small pore size
Conductivite ionique des solutions solides Ag1+xZr2−xMx(PO4)3 AVEC MIII=Sc,Fe
作者:J Angenault、J.C Couturier、M Quarton
DOI:10.1016/0025-5408(89)90040-8
日期:1989.7
silver ion conductors, the solid solutions Ag/sub1+chi/Zr/sub 2-chi/M/sub chi/(PO/sub 4/)/sub3/ (M = Sc,Fe) have been prepared by direct synthesis. A Nasicon related phase has been obtained. Variations of ionic conductivity and activationenergy appear essentially correlated with geometrical factors. The fast Ag/sup +/ ion transport in the Nasicon phase results from its large polarizability.