在SBA-15上支持的in situ碳改性Pt催化剂上,在0°C下对乙烯进行有效的催化氧化
Qian Zhao1, Yang Gu1, Heyun Fu1
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
新的碳改性催化剂 (Pt/CSBA-15) 在低温下有效氧化乙烯 (C2H4). 这通过提高催化剂性能和疏水性来增强水果和蔬菜的保存.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 乙烯 (C2H4) 氧化对于延长水果和蔬菜的保质期至关重要.
- 开发高效,稳定的低温乙烯氧化催化剂仍然是一个重大挑战.
研究的目的:
- 设计和合成一种新型的碳改性催化剂,支持SBA-15 (Pt/CSBA-15),用于高效的乙烯氧化.
- 调查 *in situ* 碳修饰对催化剂结构,性能和疏水性的影响.
主要方法:
- 合成Pt/CSBA-15催化剂使用易于固相研磨-透-惰性大气化方法.
- 使用分析催化剂结构,Pt粒子大小和表面特性的技术进行表征.
- 对低温 (0°C) 乙烯氧化催化性能的评估.
主要成果:
- 在SBA-15孔内*in situ*形成的薄碳层成功分散了Pt纳米粒子,导致与未经修改的催化剂相比,粒子大小更小.
- 由于碳物种,PT/CSBA-15催化剂表现出增强的疏水性.
- 3Pt/CSBA-15和5Pt/CSBA-15在0°C下7小时以上实现了100%的乙烯转化,3Pt/CSBA-15在20小时后显示了81.5%的转化和71.6%的CO2产量.
结论:
- 开发的单步方法有效控制Pt颗粒大小,并增强催化剂的疏水性.
- Pt/CSBA-15催化剂在低温乙烯氧化中表现出卓越的性能,这归因于小Pt颗粒上增强的O2吸附和疏水碳层抑制的H2O吸附.
- 这种方法为设计用于乙烯氧化应用的简单,高效的疏水催化剂提供了一个有前途的策略.
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