Bimetallic catalysts have attracted increasing attention in propane dehydrogenation (PDH) due to the synergistic effect of metal species and considerably improved catalytic performance, but they often suffer from severe sintering and poor stability. Here, well-dispersed and ultrasmall PtZn bimetallic nanoclusters encapsulated in silicalite-1 (S-1) zeolites (named PtZn@S-1) are prepared via a facile in situ synthesis strategy. It is indicated that the PtZn bimetallic nanoclusters with ultrasmall size are homogeneously dispersed within the channels of S-1 zeolites. The 0.3Pt0.5Zn@S-1 catalyst shows excellent catalytic performance in PDH with a propane conversion of 45.3% and a propylene selectivity of >99%, and no visible sintering of PtZn bimetallic nanoclusters is observed in the long-term PDH reaction at 550 °C. The excellent catalytic properties and high stability of the ultrasmall bimetallic nanoclusters confined in zeolites create new prospects for PDH.

由于金属种类的协同作用和显着改善的催化性能，双金属催化剂在丙烷脱氢（PDH）中引起了越来越多的关注，但是它们经常遭受严重的烧结和较差的稳定性。在这里，通过简便的原位合成策略制备了包裹在silicalite-1（S-1）沸石（命名为PtZn @ S-1）中的分散良好的超小PtZn双金属纳米簇。结果表明，超小尺寸的PtZn双金属纳米团簇均匀地分散在S-1沸石的通道内。0.3Pt0.5Zn@S-1催化剂在PDH中表现出出色的催化性能，丙烷转化率为45.3％，丙烯选择性> 99％，并且在PDH的长期PDH反应中未观察到PtZn双金属纳米团簇的可见烧结。 550℃。