Cobalt‐Based Catalyst Supported on Different Morphologies of Alumina for Non‐oxidative Propane Dehydrogenation: Effect of Metal Support Interaction and Lewis Acidic Sites

Abstract

Developing an economically viable and eco-friendly catalyst is essential for the dehydrogenation reaction. In this context, cobalt-based catalysts supported on different morphologies of γ-Al 2 O 3 , nano-sheet (Al 2 O 3 À NS), nano-fiber (Al 2 O 3 À NF) and nanoplate (Al 2 O 3 À NP) were synthesized using wetness impregnation method and tested for non-oxidative propane dehydrogenation reaction. Metal support interaction and Lewis acidic center play a crucial role in propane dehydrogenation reaction; therefore this study focuses on investigating the role of these parameters on the catalytic activity for cobalt-based catalysts. A higher metal support interaction was observed in Co/Al 2 O 3 À NS as compared to Co/Al 2 O 3 À NF and Co/Al 2 O 3 À NP. The presence of tetrahedral coordinated Co + 2 in Co/Al 2 O 3 À NS leads to higher selectivity towards propylene. The formation of metallic cobalt from Co 3 O 4 precursor present in Co/Al 2 O 3 À NP promoted side reactions to form lower hydrocarbons and carbon, which caused catalyst deactivation. In-situ DRIFTS analysis revealed the interaction of propane and propylene gases with the catalyst, which was an important revelation to find the source of carbon deposition.

PtZn intermetallic nanoalloy encapsulated in silicalite‐1 for propane dehydrogenation

“…Propylene is one of the most important feedstocks in the global economy for the production of various chemicals and fuels 1–4 . The worldwide increasing demand of propylene together with the increasing availability of propane from clean energy source as shale gas has spurred interest in on‐purpose production of propylene via direct dehydrogenation 5–9 . Pt‐based catalysts are widely used in industrial propane dehydrogenation (PDH) processes because of their superior activation of paraffinic CH bonds and low activity to CC cleavage 10–12 .…”

Porous Silica Coated Ceria as a Switch in Tandem Oxidative Dehydrogenation and Dry Reforming of Ethane with CO2

“…CO 2 TPD was carried out to study the adsorption/desorption of CO 2 on different catalysts, the desorption curves in Figure 6 showed that all samples contained two overlapped peaks from100 to 200, and from 200 to 600 °C, which could be attributed to the adsorption of CO 2 on weak (peak 1) and medium (peak 2) basic sites, [22a,34] respectively. The quantified results in Table S3 showed the gradually decreasing trends of CO 2 uptake as the SiO 2 content increased whatever for weak or medium basic sites.…”

High‐Density Lewis Acid Sites in Porous Single‐Crystalline Monoliths to Enhance Propane Dehydrogenation at Reduced Temperatures

“…However, operation with non‐noble‐metal catalyst like VO X /Al 2 O 3 and VO X /ZrO 2 leads to a conversion below ≈25 % and a propene selectivity below ≈90 % even at ≈600 °C, while it suffers from serious coke deposition and conversion drop in dozens of minutes [14–17] . For non‐noble metal catalyst, the lack of catalytic activity gives rise to a limited propane conversion at reduced temperatures while the complicated functional groups at surfaces distract the main reaction to generate by‐products including methane, ethane and coke [18] . The high density of weak Lewis acid sites on the surface of catalyst is beneficial for the propane dehydrogenation reaction and could suppress the cracking reaction to avoid carbon deposition [16, 19, 20] …”