浙江大学肖丰收团队报道了脱铝β沸石逆转Ostwald粗化，制备耐用的铜纳米粒子催化剂。相关研究成果于2023年12月21日发表在国际顶尖学术期刊《科学》。

铜纳米粒子基催化剂已在工业中得到广泛应用，但在化学气氛中，纳米粒子往往会烧结成较大的纳米粒子，这对催化剂的性能不利。

该文中，研究人员使用脱铝的β沸石来支撑Cu纳米颗粒（Cu/Beta-deAl），并表明这些颗粒在200°C的甲醇蒸汽中变得更小，从~5.6nm减少到~2.4nm，这与一般的烧结现象相反。发现了一种反向Ostwald粗化过程，其中被甲醇激活的可迁移铜位点被硅醇巢捕获，巢中的铜物种充当形成小纳米颗粒的新成核位点。这一特性扭转了一般的烧结通道，在工业上为用负载的铜纳米颗粒进行草酸二甲酯加氢时产生了强大的催化剂。

附：英文原文

Title: Dealuminated Beta zeolite reverses Ostwald ripening for durable copper nanoparticle catalysts

Author: Lujie Liu, Jiaye Lu, Yahui Yang, Wolfgang Ruettinger, Xinhua Gao, Ming Wang, Hao Lou, Zhandong Wang, Yifeng Liu, Xin Tao, Lina Li, Yong Wang, Hangjie Li, Hang Zhou, Chengtao Wang, Qingsong Luo, Huixin Wu, Kaidi Zhang, Jiabi Ma, Xiaoming Cao, Liang Wang, Feng-Shou Xiao

Issue&Volume: 2023-12-21

Abstract: Copper nanoparticle-based catalysts have been extensively applied in industry, but the nanoparticles tend to sinter into larger ones in the chemical atmospheres, which is detrimental to catalyst performance. Herein we used dealuminated Beta zeolite to support Cu nanoparticles (Cu/Beta-deAl) and showed that these particles become smaller in methanol vapor at 200°C, decreasing from ~5.6 to ~2.4 nanometers, which is opposite to the general sintering phenomenon. A reverse Ostwald ripening process was discovered, where migratable copper sites activated by methanol were trapped by silanol nests, and the copper species in the nests acted as new nucleation sites for forming small nanoparticles. This feature reversed the general sintering channel, resulting in robust catalysts for dimethyl oxalate hydrogenation performed with supported copper nanoparticles in industry.

DOI: adj1962

Source: https://www.science.org/doi/10.1126/science.adj1962