Fabrication of NiZn bimetallic oxides catalysts supported on carbon black waste for catalytic pyrolysis of fatty acid

Catalytic deoxygenation of stearic acid into olefins over Pt catalysts supported on MOF-derived metal oxides

“…At 550 °C, all MOF precursors have been completely decomposed into their respective metal oxides. 45 The removal of organic linkers resulted in an increase in the specific surface area of Ce-BTC (21.1 m 2 g −1 ) into CeO 2 (59.5 m 2 g −1 ), as tabulated in Table S1 † 35 . However, the specific surface area of UIO-66 (1456 m 2 g −1 ) was found to decrease after calcination into ZrO 2 (6.1 m 2 g −1 ).…”

“…Meanwhile, as tabulated in Table S1,† the specific surface area of Ce-BTC, UIO-66, and MIL-88B(Fe) was determined to be 21.1, 1456, and 42.7 m 2 g −1 , respectively. Upon high-temperature calcination, the organic linkers in the MOF precursors were removed, leading to a decrease in mass, 45 as determined by TGA as shown in Fig. S2 †.…”

“…This shows that longer carbon chain substrates are easier to convert and deoxygenate. 45 Meanwhile, when unsaturated fatty acids such as C 16 H 30 O 2 (C 16 = ) and C 18 H 34 O 2 (C 18 = ) were catalyzed with Pt/CeO 2 , it was found that the presence of double bonds in fatty acids significantly increased aromatic products compared to fatty acids with saturated carbon chains, from 28% (C 16 ) to 40% (C 16 = ) and 26% (C 18 ) to 60% (C 18 = ), respectively. Therefore, based on these results, it is concluded that, in addition to the type of catalyst, reaction temperature, and fatty acid substrate amount, the type of fatty acid substrate, in terms of both carbon chain length and degree of carbon saturation, will affect the selectivity of the products via deoxygenation of fatty acid.…”

Graphene-Encapsulated Transition Metal@N/C Catalysts for Catalytic Copyrolysis of Biomass and Waste Plastics: Production of Linear α-Olefins and Aromatics

“…65 Previous studies have shown that the Ni(II) site helps in the easy desorption of olefin and prevents secondary reactions, thus increasing the selectivity of useful olefin fractions. 65,66 The 25:75 feed mix generated relatively more compositions of 1-heptene (3.49%), 1-decene (2.18%), and 1-nonene (1.99%) among the C4−C10 olefins, while the HDPE feed alone generated comparatively more contents of 1-hexene (2.47%) and 1-octene (1.46%). For the C11−C20 olefins, the individual HDPE pyrolysis yielded more relative proportion of 1-nonadecene (14.1%) and 1-pentadecene (2.58%), while the 75:25 feed mixes copyrolysis yielded more of 1-tridecene (2.52%) and 1-tetradecene (1.91%).…”

“…Notably, the metal/metal oxide Lewis sites also improved the dehydrogenation and dehydrocyclization of alkane and olefins for aromatization reactions. 19,55,65,66,71 The Lewis acidic metallic centers advanced the formation of other alkylated MAHs at high temperatures at the expense of other aromatic and olefin formations. 72 The formation of PAHs during catalytic copyrolysis was attributed to the strong adsorption sites from the nitrogen doping, which helped further condensation of MAHs and induced the formation of PAHs.…”