美国密歇根大学Suljo Linic团队开发了热力学限定下的丙烷脱氢稳定选择性催化剂。相关研究成果发表在2021年7月9日出版的《科学》。

通过无氧化丙烷脱氢（PDH）有意（“on-purpose”）生产丙烯对于满足日益增长的全球丙烯需求具有巨大的前景。为了获得稳定的性能，传统的氧化铝负载铂基催化剂需要过量的锡和氢气稀释；然而，这降低了丙烯的单程转化率，从而降低了催化剂的生产率。

研究人员报道了二氧化硅负载铂锡（Pt1Sn1）纳米颗粒（<2纳米直径）可以在热力学限制的转化水平下作为PDH催化剂，对丙烯具有极好的稳定性和选择性（>99%）。前驱体中铂和锡的原子混合在还原和催化操作过程中得以保持。这些纳米颗粒与二氧化硅载体的良性相互作用，不会导致Pt-Sn偏析和在传统催化剂载体上可能发生的氧化锡相的形成。

附：英文原文

Title: Stable and selective catalysts for propane dehydrogenation operating at thermodynamic limit

Author: Ali Hussain Motagamwala, Rawan Almallahi, James Wortman, Valentina Omoze Igenegbai, Suljo Linic

Issue&Volume: 2021/07/09

Abstract: Intentional (“on-purpose”) propylene production through nonoxidative propane dehydrogenation (PDH) holds great promise for meeting the increasing global demand for propylene. For stable performance, traditional alumina-supported platinum-based catalysts require excess tin and feed dilution with hydrogen; however, this reduces per-pass propylene conversion and thus lowers catalyst productivity. We report that silica-supported platinum-tin (Pt1Sn1) nanoparticles (<2 nanometers in diameter) can operate as a PDH catalyst at thermodynamically limited conversion levels, with excellent stability and selectivity to propylene (>99%). Atomic mixing of Pt and Sn in the precursor is preserved upon reduction and during catalytic operation. The benign interaction of these nanoparticles with the silicon dioxide support does not lead to Pt-Sn segregation and formation of a tin oxide phase that can occur over traditional catalyst supports.

DOI: 10.1126/science.abg7894

Source: https://science.sciencemag.org/content/373/6551/217