Synthesis of fluorinated ZSM-5 catalysts: fluoride effect on structure properties and coke resistance in n-hexane catalytic cracking
Source abstract
Abstract
ZSM-5 zeolite performed better than several typical zeolites in the catalytic cracking process to produce light olefins, but this catalyst also has disadvantages such as fast deactivation due to high strong acid sites and low mesopore in the structure of ZSM-5. To overcome these problems and optimize the amount of mesopores and acidic sites, the hierarchical ZSM-5 zeolites were obtained with chemical treatment with an NH4F aqueous solution. In this investigation, the NH4F concentration, treatment duration, and temperature of reaction ZSM-5 with NH4F were optimized. In the following, the XRD, NH3-TPD, ATR-FTIR, FE-SEM, EDX Dot-Mapping, BET, AAS, and TGA analyses were used to determine the physicochemical properties of the treated zeolites. Then the catalytic cracking and investigation of the prepared catalyst performance were done in a fixed-bed microreactor system. Based on the results, the X sample, with the minimum strong to weak acidic site ratio (0.12) and the highest hierarchical factor (0.217), had the maximum light olefin production yield of 56.97% and propylene to ethylene ratio of 3.96, which is a significant improvement compared to its parent zeolite.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Zeolite Catalysis and Synthesis · Metal-Organic Frameworks: Synthesis and Applications · Catalysis and Oxidation Reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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