Synthesis of Ga-modified ZSM-48 with improved hydroisomerization performance of n-dodecane,Reaction Chemistry & Engineering

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Synthesis of Ga-modified ZSM-48 with improved hydroisomerization performance of n-dodecane
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2023-06-19 , DOI: 10.1039/d3re00278k
Wei Zhang ₁ , Haipeng Zhang ₁ , Mengxi Ma ₁ , Shuzhen Wang ₁ , Jiangnan Xiang ₁ , Yan Wang ₁ , Weijiong Dai ₁ , Binbin Fan ₁ , Jiajun Zheng ₁ , Ruifeng Li ₁

Affiliation

A series of Ga-modified ZSM-48 zeolites (GaZSM-48) with nanoparticle-assembled morphology were synthesized by applying the dynamic hydrothermal method. XRD, XPS, FT-IR and ⁷¹Ga NMR results verify that Ga species are introduced into the ZSM-48 molecular sieve framework. The acid amount and the acid strength are reduced by Ga modification, especially for Brønsted acid. The n-dodecane hydroisomerization performances of Pt-supported ZSM-48 and GaZSM-48 are investigated. The results show that the Pt/GaZSM-48-x has higher isomer selectivity compared with the original ZSM-48. Pt/GaZSM-48-1 provides the best iso-dodecane yield of 76%. The ratio of mono-methyl isomers (MOB) and multi-methyl isomers (MUB) of Pt/GaZSM-48-1 is 1.58 at 340 °C, which is 3 times higher than that of the original ZSM-48. The zero-length column (ZLC) method is adopted to study the diffusivity, and the results show that the diffusion resistance is reduced by the Ga modification, and the TOF of the Ga-modified ZSM-48 catalyst is about 1.21–2.73 times that of the original ZSM-48 catalyst.

中文翻译：

提高正十二烷加氢异构化性能的Ga修饰ZSM-48的合成

采用动态水热法合成了一系列具有纳米颗粒组装形貌的Ga改性ZSM-48沸石（GaZSM-48）。XRD、XPS、FT-IR 和⁷¹ Ga NMR 结果验证了 Ga 物种被引入到 ZSM-48 分子筛骨架中。Ga改性降低了酸量和酸强度，特别是对于布朗斯台德酸。研究了Pt负载ZSM-48和GaZSM-48的正十二烷加氢异构化性能。结果表明，Pt/GaZSM-48- x与原ZSM-48相比，具有更高的异构体选择性。Pt/GaZSM-48-1 提供最佳的异十二烷产率，可达 76%。Pt/GaZSM-48-1在340℃时单甲基异构体（MOB）与多甲基异构体（MUB）的比率为1.58，比原始ZSM-48高3倍。采用零长柱（ZLC）法研究扩散系数，结果表明Ga修饰降低了扩散阻力，Ga修饰的ZSM-48催化剂的TOF约为其1.21~2.73倍。原始 ZSM-48 催化剂。

更新日期：2023-06-19

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