摘要
研究揭示了PtSn双金属催化剂在丙烷脱氢(PDH)中的高效活性与稳定性机制。分子筛限域策略(S-1孔径0.55 nm)抑制PtSn颗粒烧结(<2 nm)并减少积碳(质量分数2.5%)。优化n(Pt)∶n(Sn)=1∶1.5时,丙烷转化率达45.3%,丙烯选择性>99%。CO_(2)共进料通过逆水煤气反应动态清碳,使催化剂连续运行1 440 min活性衰减<1%。XPS与DFT证实Sn向Pt转移电子,降低脱氢能垒(0.95 eV)。β-Mo_(2)C耦合增强抗硫性(硫中毒衰减<10%)。
This study reveals the efficient activity and stability mechanism of PtSn bimetallic catalyst in propane dehydrogenation(PDH).Molecular sieve confinement strategy(S-1 pore size 0.55 nm)suppresses PtSn particle sintering(<2 nm)and reduces carbon deposition(mass fraction 2.5%).When optimizing n(Pt):n(Sn)=1:1.5,the propane conversion rate reaches 45.3%and the propylene selectivity is>99%.CO_(2) co feed is dynamically decarbonized through reverse water gas reaction,resulting in a catalyst activity decay of less than 1%after continuous operation for 1440 minutes.XPS and DFT confirmed that Sn transfers electrons to Pt,reducing the dehydrogenation energy barrier(0.95 eV).β-Mo_(2)C coupling enhances sulfur resistance(sulfur poisoning attenuation<10%).
作者
安怀清
邹国军
赵朋伟
An Huaiqing;Zou Guojun;Zhao Pengwei(Chemistry and Chemical Engineering of Guangdong Laboratory,Chaozhou Guangdong 521000,China)
出处
《山西化工》
2025年第8期1-2,18,共3页
Shanxi Chemical Industry
基金
2022年汕头市科技局规划项目(STKJ202209080)。
关键词
丙烷脱氢
PtSn双金属催化剂
积碳抑制
propane dehydrogenation
PtSn bimetallic catalyst
carbon deposition inhibition
