Promotion on light olefins production through modulating the reaction pathways for n -pentane catalytic cracking over ZSM-5 based catalysts

Effect of Type of Matrix on Formation of Aromatics by Cracking and Dehydrocyclization of <i>n</i>-Pentane Using ZnZSM-5 Metal Oxide Hierarchical Composite Catalysts

“…Zn ions are reported to promote the dehydrogenation of butenes and propene in pentane reforming, and coupling of the butadiene or allylic species formed may produce aromatics 3) . Transition metals such as Pt may also promote dehydrogenation to produce olefins 44) and aromatization of smaller alkanes such as propane would proceed through initial dehydrogenation 8),9) . Addition of Zn may promote the dehydrogenation of butenes to butadiene.…”

“…Other zeolites than ZSM-5 could also promote aromatization of alkanes, but through a different mechanism from that of ZSM-5 and very few examples are known 39)-42) . Acidic sites like ZnH or ZnOH 43), 44) or protonic acid sites 45) may be active for the aromatization or isomerization of alkanes by hydrogen transfer on Zn/HZSM-5. However, the effects of the components and structure of catalysts on the activity and selectivity remain unknown.…”

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

“…[1,2] In addition, the derivatives of light olefins have been widely used for the production of plastics, rubbers, cosmetics, as well as automobile parts. [3,4] Traditionally, the light olefins are mainly produced by the thermal cracking process. [5] However, there are some drawbacks, such as high reaction temperature, broad product distribution, and high emission of greenhouse gases (e. g., CO 2 , CH 4 ).…”

“…The global demand of light olefins, such as ethylene, propylene, and butylene is growing significantly, as they are one of the most important raw materials in petrochemical industries for the production of various polymers ranging from polyethylene, polypropylene to ethylene oxide and acrylic acid . In addition, the derivatives of light olefins have been widely used for the production of plastics, rubbers, cosmetics, as well as automobile parts . Traditionally, the light olefins are mainly produced by the thermal cracking process .…”

Kinetics and reactor modeling of the conversion of n-pentane using HZSM-5 catalysts with different Si/Al ratios

“…These catalytic cracking and aromatization processes are usually carried out over HZSM-5 zeolite (MFI structure) catalysts, 10 where the presence of Al in its framework gives the zeolite Brønsted acidity, which has been found crucial for the selective conversion of n-pentane into olefins. [11][12][13] These olefins can also form aromatic compounds through oligomerization and cyclization-aromatization pathways in the zeolite acid sites. [13][14][15] Remarkable yields of BTX aromatics have recently been reported using Zn-and Ga-modified ZSM-5, 8,9 as well as the important role of the framework and extraframework Al sites in aromatization reactions.…”