Selective Oxidation of Carbon Monoxide and Ethene Mixture on Zeolite NaA Membranes Coated Catalysts

Zhong, Yijun; 浙江工业大学化学工程与材料科学学院, 绿色化学合成技术国家重点实验室培育基地; 浙江师范大学物理化学研究所, 浙江省固体表面反应化学重点实验室; Xu, Xianzhu; Li, Jiang; Zhu, Weidong; Ma, Chao

doi:10.3866/pku.whxb20081023

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“…Taking advantage of the molecular sieving ability of zeolite membrane shell, better selectivity and superior reusability of the catalysts can be achieved. 6,7 For example, MFI-type zeolite capsule catalysts were prepared for adjusting the products distribution of Fischer-Tropsch synthesis as well as realizing the combination of sequential reactions from syngas (CO/H2) to methanol and then to dimethyl ether. [8][9][10][11][12] There are two main methods to synthesize zeolite membrane on the supports: in-situ hydrothermal synthesis and secondary growth on seeded supports.…”

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confidence: 99%

Synthesis of MFI-Type Zeolite Membrane Encapsulated Activated Carbon Particles Using a Modified Seeded Method

Jin¹,

浙江大学化学工程与生物工程学系²,

Cheng³

et al. 2013

Acta Physico-Chimica Sinica

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Zeolite membranes with their advantageous separation and catalytic properties can be coated on traditional catalysts to achieve highly effective perfermance. It is difficult to coat zeolite membranes onto activated carbon (AC) particles, a commonly used catalyst support, because of the hydrophobic and rough surfaces of AC. To overcome these shortcomings, a boehmite gel modified seeded method was developed to synthesize MFI-type zeolite membrane encapsulated AC particles. By using the spray-coating process, the boehmite sol precursor was introduced in a gel layer on the AC surface to provide a smooth surface for seed dispersion and a binder for seed fixation. The obtained seed layer was dense and firm even without calcination. After 6 h rotary hydrothermal synthesis, continuous zeolite membrane encapsulated AC particles were obtained. The synthetic membrane type and the composite material morphologies were elucidated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results indicate that MFI-type zeolite membrane has a thickness of 5 μm. For comparison, on AC particles without boehmite gel modification, no continuous membrane forms. Our boehmite gel modified seeded strategy provides an efficient way to prepare zeolite membranes on different inert supports.

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