沉积-沉淀法和沉积-还原法制备Nb2O5负载的金纳米粒子及其催化CO氧化活性

doi:10.1016/S1872-2067(16)62508-1

催化学报 ›› 2016, Vol. 37 ›› Issue (10): 1694-1701.DOI: 10.1016/S1872-2067(16)62508-1

沉积-沉淀法和沉积-还原法制备Nb₂O₅负载的金纳米粒子及其催化CO氧化活性

Toru Murayama, Masatake Haruta

首都大学东京金化学研究中心, 东京192-0397, 日本

收稿日期:2016-05-19 修回日期:2016-06-30 出版日期:2016-10-21 发布日期:2016-10-22
通讯作者: Toru Murayama

Preparation of gold nanoparticles supported on Nb₂O₅ by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation

Toru Murayama, Masatake Haruta

Research Center for Gold Chemistry, Tokyo Metropolitan University, F203-1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan

Received:2016-05-19 Revised:2016-06-30 Online:2016-10-21 Published:2016-10-22
Contact: Toru Murayama

摘要/Abstract

摘要：

采用不同的沉积法制备了氧化铌（Nb₂O₅）负载的金纳米粒子催化剂，即沉积-沉淀（DP）法、尿素辅助的DP法、沉积-还原（DR）法和一步法制备了1 wt% Au/Nb₂O₅催化剂.在众多类型Nb₂O₅（包括商业Nb₂O₅）中，采用水热法制备的层间型Nb₂O₅（Nb₂O₅（HT））最适合用作载体.结果表明，较大比表面积的Nb₂O₅（HT）使得金以纳米颗粒形式分散于其上.在优化的条件下，以DP和DR法沉积于Nb₂O₅（HT）上的金纳米粒子平均粒径为5 nm.采用DR法制备的Au/Nb₂O₅（HT）催化剂上CO转化率为50%时的温度为73℃.不沉积金的条件下，即使在250℃，Nb₂O₅（HT）对CO氧化反应也没有催化活性.因此，金的沉积对活性的促进作用非常明显.该简易Au/Nb₂O₅催化剂将金催化剂的类型扩展到酸性载体，这将增加新的应用.

关键词: 金纳米粒子, 氧化铌, 固体酸, CO氧化, 多相催化剂

Abstract:

Nanoparticulate gold catalysts supported on niobium oxides (Nb₂O₅) were prepared by different deposition methods. The deposition precipitation (DP) method, DP method with urea, deposition reduction (DR) method and one-pot method were used to prepare a 1 wt% Au/Nb₂O₅ catalyst. Layered-type Nb₂O₅ synthesized by a hydrothermal method (Nb₂O₅(HT)) was the most suitable as a support among various types of Nb₂O₅ including commercially available Nb₂O₅ samples. It appeared that the large BET surface area of Nb₂O₅(HT) enabled the dispersion of gold as nanoparticles (NPs). Gold NPs with a mean diameter of about 5 nm were deposited by both the DP method and DR method on Nb₂O₅(HT) under an optimized condition. The temperature for 50% CO conversion for Au/Nb₂O₅(HT) prepared by the DR method was 73℃. Without deposition of gold, Nb₂O₅(HT) showed no catalytic activity for CO oxidation even at 250℃. Therefore, the enhancement of the activity by deposition of gold was remarkable. This simple Au/Nb₂O₅ catalyst will expand the types of gold catalysts to acidic supports, giving rise to new applications.

Key words: Gold nanoparticulate, Niobium oxide, Solid acid, CO oxidation, Heterogeneous catalyst

Toru Murayama, Masatake Haruta. 沉积-沉淀法和沉积-还原法制备Nb₂O₅负载的金纳米粒子及其催化CO氧化活性[J]. 催化学报, 2016, 37(10): 1694-1701.

Toru Murayama, Masatake Haruta. Preparation of gold nanoparticles supported on Nb₂O₅ by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation[J]. Chinese Journal of Catalysis, 2016, 37(10): 1694-1701.

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沉积-沉淀法和沉积-还原法制备Nb₂O₅负载的金纳米粒子及其催化CO氧化活性

Preparation of gold nanoparticles supported on Nb₂O₅ by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation

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