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Effect of copper precursors on the catalytic performance of Cu-ZSM-5 catalysts in n2o decomposition

Chinese Journal of Chemical Engineering 2018年第5期26卷 1051-1058页

作者： Tao Meng nan Ren Zhen Ma School of Chemical and Environmental Engineering Shanghai Institute of Technology Shanghai 201418 China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP^3) Department of Environmental Science and Engineering Fudan University Shanghai 200433 China Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of Chemistry Fudan University Shanghai 200433 China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China

Five Cu-ZSM-5 catalysts were obtained by treating na-ZSM-5 （Si/Al ratio = 15） with aqueous solutions of differ- ent Cu precursors （CuCl2, Cu（no3）2, CuSo4, Cu（CH3Coo）2, and ammoniacal copper （II） complex ion）. After being pretreated in flowing He at 500 ℃ to form active Cu＋, these catalysts exhibited quite different activities in cata- lytic decomposition of n2o. CZM-AC（II）（prepared by ammoniacal copper （II） complex ion） with 9.4 wt% Cu con- tent was the most active among these Cu-ZSM-5 catalysts, achieving almost complete n2I conversion at 400 ℃. CZM-CA （prepared using Cu（ CH3Coo）2 as the Cu precursor） with 2.8 wt% Cu content was the second most active catalyst among these Cu-ZSM-5 catalysts, achieving almost complete n2I conversion at 425 ℃. CZM-CC, CZM- Cn, and CZM-CS prepared by using CuCl2, Cu（no3）2, or CuSo4 as the Cu precursor with similar Cu contents （≈1.7 wt%） were the least active among these Cu-ZSM-5 catalysts, achieving ca. 90% n2o conversion at 500 ℃. XRD, ICP, SEM, TEM, EDX-mapping, and Co-IR experiments were conducted to characterize relevant samples. The superior activity of CZM-AC（II） can be attributed to the high contents of total Cu＋ and dimeric Cu＋ among these samples. The influence of co-fed o2 or H2o on the catalytic performance of typical samples was also studied.

关键词： Copper precursor Cu-ZSM-5 n2o decomposition Catalysis Catalyst Zeolite

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Rh2o3/hexagonal CePo4 nanocatalysts for n2o decomposition

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Frontiers of Chemical Science and Engineering 2017年第4期11卷 586-593页

作者： Huan Liu Zhen Ma Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP3) Department of Environmental Science & Engineering Fudan University Shanghai 200433 China

Hexagonal CePo4 nanorods were prepared by a precipitation method and hexagonal CePo4 nanowires were prepared by hydrothermal synthesis at 150 ℃. Rh （no3）3 was then used as a precursor for the impregnation of Rh203 onto these CePo4 materials. The Rh203 supported on the CePo4 nanowires was much more active for the catalytic decomposition of n20 than the Rhzo3 supported on CePo4 nanorods. The stability of both catalysts as a function of time on stream was studied and the influence of the co-feed （Co2, o2, H20 or o2/H20） on the n20 decomposition was also investigated. The samples were characterized by n2 adsorption-desorption, induc- tively coupled plasma optical emission spectroscopy, X- ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, hydrogen temperature-pro- grammed reduction, oxygen temperature-programmed desorption, and Co2 temperature-programmed desorption in order to correlate the physicochemical and catalytic properties.

关键词： Rh2o3 CePo4 n2o decomposition

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Rh_2o_3/mesoporous Mo_x-Al_2o_3(M = Mn,Fe,Co,ni,Cu,Ba)catalysts:Synthesis,characterization,and catalytic applications

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Chinese Journal of Catalysis 2016年第1期37卷 73-82页

作者：刘欢林毅马臻复旦大学环境科学与工程系上海市大气颗粒物污染与防治重点实验室上海200433

Recently,a one-pot self-assembly method was proposed for the synthesis of mesoporous Al2o3 and Mox-Al2o3 composite ***,few attempts have been made to use mesoporous Mox-Al2o3 composites to support metal oxides for *** the present work,mesoporous Mox-Al2o3（M = Mn,Fe,Co,ni,Cu,Ba）materials were prepared by a one-pot self-assembly method using Pluronic P123 as a structure-directing *** obtained mesoporous materials were loaded with Rh2o3 nanoparticles via impregnation with Rh（no3）3 followed by calcination in air at 500°*** resulting catalysts were characterized by X-ray diffraction,n2 adsorption-desorption measurements,transmission electron microscopy,inductively coupled plasma optical emission spectrometry,X-ray photoelectron spectroscopy,and their catalytic activity and stability for Co oxidation and n2o decomposition were *** Rh2o3 nanoparticles were found to be on the order of1 nm in size and were highly dispersed on the high surface area mesoporous Mox-Al2o3 supports.A number of the Rh2o3/mesoporous Mox-Al2o3 catalysts exhibited higher catalytic activity than the Rh2o3/mesoporous Al2o3 prepared for comparison.

关键词： one-pot synthesis Mesoporous alumina Metal oxide Co oxidation n2o decomposition

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