Heterogeneous catalyst engineering ⇒ from stable and deactivation resistant to viable technical catalyst

Problem statement

Advances in heterogeneous catalyst “structure” are driven to improve their “function” or performance, i.e., activity, selectivity, and stability. Cooperative research is required to understand the structure and function relationships: developing new synthesis protocols for heterogeneous catalysts with unique surface properties, defined porosity, identification and understanding of catalytically active sites, reaction mechanisms, and finally, prediction and analysis of the processes using various computational tools.

Our group focuses on developing new catalyst formulations using innovative synthesis routes for various important heterogeneous catalysts. That includes thermal, electro, and bio-electro catalysis.

The active phase cannot be used directly in its final application or reactor for various reasons, including poor mechanical resistance, heat or mass transport, and fluidization features. We must mix the active phase with other ingredients in a matrix of binder and filler, while we shape it into a technical catalyst. We investigate new synthetic protocols for technical catalysis using spray drying and fluidized beds to cover the whole range of sizes. At the same time, we incorporate additional (unconventional) ingredients such as SiC to improve some features even further.

Goals

  • Technical catalyst I ⇒ spray drying and extrusion
  • Technical catalyst II ⇒ spray fluidized bed reactor
  • Technical catalyst III ⇒ electrospinning
  • Zeolite catalysts ⇒ with defined structure/porosity
  • Multi-metal (high entropy) alloy catalysts
  • MXene catalysts ⇒ single and multi-dimensional
  • Perovskite catalysts
  • Metal-organic framework (MOFs) catalysts
  • Supported metal/metal-oxide catalysts
  • Aerogel catalyst

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Related Publications

Effect of the Support Acidity on the Aromatic Ring-Opening of Pyrolysis Gasoline over Pt/HZSM-5. Catalysts

by Castaño, Gutierrez, Villanueva, Pawelec, Arandes
Catal. Today Year: 2009

Abstract

In this paper we evaluate the effect of the acidity of the support (HZSM-5) and the nature of the interaction between the active phases of the bifunctional Pt/HZSM-5 catalyst on the aromatic ring-opening of pyrolysis gasoline under hydrocracking conditions. The catalysts were characterized by N2 adsorption–desorption isotherms, CO chemisorption, pyridine FTIR, NH3 adsorption-DSC and NH3 TPD. The catalyst screening in the pyrolysis gasoline hydrocracking demonstrated that: (i) the conversion of pyrolysis gasoline is linearly dependent on support acidity. At low acidities values the main mechanisms of ring-opening is through hydrogenolysis and thus, the less acidic catalyst shows higher conversion than expected; (ii) the synergysm between the metal and acid-sites is enhanced when using a bifunctional catalyst instead of a hybrid one, due to the increase in H2 spill-over efficiency. However, in terms of activity, the most acid catalyst (hybrid) shows the highest aromatic conversion, in correspondence with (i).

Keywords

W2C HCE HPC