在Pt催化循环脱过程中依赖反应剂的火山趋势:轨道杂交导向的活跃地点的设计
Yongxiao Tuo1, Jingying Qu2, Huailu Sun2
1State Key Laboratory of Heavy Oil Processing, College of New Energy, China University of Petroleum (East China), 66 West Changjiang Road, Qingdao, Shandong, China.
我们在催化脱中发现了反应剂特异性火山关系,由-协调号 (CNPt-Pt) 控制. 这一发现使得能够优化催化剂设计,以高效地生产气.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
背景情况:
- 催化剂设计往往缺乏用于将分子结构连接到最佳活性站点配置的通用描述符.
- 反应特异性优化阻碍了其在催化中的广泛应用.
研究的目的:
- 发现催化脱的通用描述符.
- 为了建立一个由-协调号 (CNPt-Pt) 控制的反应剂依赖火山关系.
- 为高效释放气设计一种高度活跃和稳定的催化剂.
主要方法:
- 使用可调整的Pt/MgAl2O4系统来系统地改变CNPt-Pt.
- 研究了CNPt-Pt,轨道杂交和各种碳化合物的脱催化活性之间的关系.
- 作为描述符,引入了芳香产品的最低未占用分子轨道 (LUMO) 能量.
主要成果:
- 分别确定了环素,甲基环素和脱素的最佳CNPt-Pt值 (~2.5,~4.7,~7.0).
- 建立了一个以轨道杂交为导向的机制,平衡C-H激活和产物脱吸.
- 在最佳CNPt-Pt时,证明了LUMO能量和Pt d频段中心之间的强有力的线性相关性.
结论:
- 芳香产品的最低未占用分子轨道 (LUMO) 能量作为调整脱催化中的电子相互作用的通用描述符.
- 优化的Pt/MgAl2O4催化剂具有2-3倍的活性,在300°C下稳定超过100小时.
- 开发了一个强大的战略,用于合理的现场工程和在脱反应中有效释放气.
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