Role of ZrO2 in Cu/ZnO/ZrO2 catalysts prepared from the precipitated Cu/Zn/Zr precursors

被引：33

作者：

Jeong, Cheonwoo ^{[1
]}

Suh, Young-Woong ^{[1
]}

机构：

[1] Hanyang Univ, Dept Chem Engn, Seoul 133791, South Korea

来源：

CATALYSIS TODAY | 2016年 / 265卷

基金：

新加坡国家研究基金会;

关键词：

Cu/ZnO/ZrO2; Precursor structure; Amorphous zirconia; Specific copper surface area; Support; METHANOL-SYNTHESIS; CU-ZNO/ZRO2; CATALYSTS; COPPER; HYDROGENATION; DEACTIVATION; CHEMISTRY; DEFECTS; SITES;

D O I：

10.1016/j.cattod.2015.07.053

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In Cu/Zn/Zr precursors prepared by coprecipitation, Zr ions showed no effect on a substitution level of Cu2+ by Zn2+ in the zincian malachite (zM) and were not incorporated into zM lattice upon precipitation and subsequent ageing. As hydroxyl-rich Zr aggregates were precipitated independent of mixed Cu/Zn precipitates, they served as a barrier to formation of larger Cu/Zn particles during precipitation and transformation into Cu/Zn needles during ageing. After calcination of Cu/Zn/Zr precursors with higher Zr contents, smaller CuO/ZnO particles were produced in between which amorphous ZrO2 was situated. Upon reduction of CuO/ZnO/ZrO2 with more Zr, this type of ZrO2 resulted in formation of smaller Cu-0 particles yielding the higher Cu dispersion. However, the specific copper surface area and catalytic activity of the reduced Cu/ZnO/ZrO2 exhibited a volcano-type relationship with the Zr/( Cu + Zn) ratio. This could be a combined result between the lower amount of total Cu and the higher Cu dispersion. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：254 / 263

页数：10

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