Al2O3-Flower Anchoring Pd Catalyst for Acetylene Selective Hydrogenation: A Compartmentalizing Strategy Promotes Metal Dispersion and Maintains Stability

• Published in: Catalysis letters 2024-08, Vol.154 (8), p.4320-4331
• Main Authors: Zhou, Tianqing, Yao, Peng, Gao, Hui, Lei, Haotian, Zhou, Huanwen, Shi, Jiangong, Liao, Xiaoyuan
• Format: Article
• Language: English
• Subjects: acetylene; Catalysis; Chemistry; Chemistry and Materials Science; ethylene; hydrogenation; industrial applications; Industrial Chemistry/Chemical Engineering; mass transfer; nanocatalysts; Organometallic Chemistry; Physical Chemistry; thermal stability
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-024-04693-z

It is highly desired that performance of Pd catalysts is improved by the design and preparation of homogeneously dispersed and stablized in many industrial catalytic processes and still a big challenge. Herein, small-sized Pd over Al 2 O 3 -flower (f-Al 2 O 3 ) via compartmentalization strategy is successfully prepared. Ultrafine Pd phases are highly dispersed and thermally stabilized by flower-liked architectures, which not only efficiently suppress Pd aggregation at reaction conditions, but also promote mass transport and reactants access to active sites easily. The catalysts exhibit a stable acetylene conversion of 93% with ethylene selectivity of 94% within a single running of 60 days (60 ℃, GHSV 4500 h −1 ) without introducing any promoter, and high TOF value (0.4 S −1 ) are achieved as well. This work provides a facile strategy of improving the activity and thermal stability of Al 2 O 3 -supported nano-catalysts in industrial application. Graphical Abstract