Silica-supported, narrowly distributed, subnanometric Pt–Zn particles from single sites with high propane dehydrogenation performance

Abstract

Silica-supported subnanometric PtZn particles, prepared via surface organometallic chemistry, are highly productive and selective for propane dehydrogenation.

Design of PtZn nanoalloy catalysts for propane dehydrogenation through interface tailoring via atomic layer deposition

“…Many different strategies such as impregnation, 14 ion exchange, 41 and a single source precursor approach using bimetallic metalorganic precursors 51 were investigated to form PtZn nanoalloy particles on different supports. Impregnation and ion exchange techniques typically lead to inhomogeneous deposition of Pt and Zn on the support.…”

“…The single source precursor approach yields precisely formed PtZn nanoalloy particles. 51 However, the single source precursor approach already requires immense efforts when a scale-up to the range of 10 to 25 g of catalyst is considered.…”

Heterogeneous alkane dehydrogenation catalysts investigated via a surface organometallic chemistry approach

“…6 This broad class of catalysts, of general structure PtM/M 0 O x , have been widely studied as model systems for the Oleflex catalyst. [106][107][108][109][110][111][112] In spite of the complexity of these systems and the presence of multiple metal species, SOMC has also been used to study supported metal nanoparticles as models for the Oleflex system. Building upon pioneering work on the Pt-Sn system by Yermakov in the late 1970's, 113,114 SOMC research in the 1980's and 1990's focused on modifying supported metal nanoparticles and generating alloys for alkane dehydrogenation through the selective grafting of organometallic compounds on the surface hydrides present at the surface of platinum particles.…”

Stepwise construction of silica-supported tantalum/iridium heteropolymetallic catalysts using surface organometallic chemistry

“…This strategy has only been explored in very rare instances [13][14][15][16][17][18] and is different from sequential co-grafting or co-impregnation methods in which both metal sites are orthogonally attached to the support, independently of one another, and are typically converted to supported alloys or nanoparticles after thermal treatment. [19][20][21][22][23][24][25][26][27][28][ [29][30][31][32] The purpose of this article is to compare both routes (A and B) in the case of a tantalum-iridium system. We demonstrate that, although homogeneously distributed heterometallic species are formed using both approaches, the nature of the obtained surface species, and therefore the catalytic performances of these materials, are affected by the chosen synthetic methodology.…”