A fast organic template-free, ZSM-11 seed-assisted synthesis of ZSM-5 with good performance in methanol-to-olefin

Yu, Qingjun; Meng, Xianglong; Liu, Jianwei; Li, Chunyi; Cui, Qiukai

doi:10.1016/j.micromeso.2013.07.034

Cited by 58 publications

(28 citation statements)

References 45 publications

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“…2, the positions of the most significant X-ray diffraction lines for the ZSM-5 synthesized in supercritical water in single and two steps are in accordance with the obtained here from conventional low temperature hydrothermal method (LTH) and previous reports [35][36][37][38][39] confirming that the product consists The crystallinity and morphology of the present product was examined by field emission scanning electron micrograph (FE-SEM) and transmission electron microscopy and (TEM). Fig.…”

Section: Catalyst Preparationsupporting

confidence: 90%

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The role of supercritical water on the rapid formation of ZSM-5 nanocatalyst

Hosseinpour

Amiri

Ahmadi

et al. 2016

The Journal of Supercritical Fluids

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Section: Catalyst Preparationsupporting

confidence: 90%

“…These templates, e.g. TPAOH, are used as structure directing and charge balancing agents inducing the formation of some special framework structures by packing into the cages and channels of zeolites [36]. However, organic template methods have clear disadvantages like toxic and expensive.…”

Section: Properties Of Synthesized Powders As a Shown Inmentioning

confidence: 99%

The role of supercritical water on the rapid formation of ZSM-5 nanocatalyst

Hosseinpour

Amiri

Ahmadi

et al. 2016

The Journal of Supercritical Fluids

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“…The SDA presence can be identified through the feeble H-C stretching sorption wavelength at about 2850-2950 cm −1 (Figure 6b). The absorption intensity at~3653 and 3765 cm −1 is dedicated to the Al-O-H-Si and Si-O-H vibration [67]. The combination of the obtained results with BET, PSD, DLS, FTIR, and XRD characterizations patterns shows that Beta with TPAOH as SDA is a support with mono sized crystals and moderate pores.…”

Section: Ft-ir Spectroscopymentioning

confidence: 74%

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

2017

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Abstract:In this research, a mono-sized Beta zeolite support synthesized by the solvothermal method was used in the selective acetylene to ethylene hydrogenation reaction with minimum coke build up on the catalyst surface. Tetrapropylammonium hydroxide (TPAOH), tetrapropylammonium bromide (TPABr), n-butylamine, and morpholine were used as structure direct agents (SDA) in the support to obtain various shapes. The characterization results show that although the Si/(Al + SDA) ratio has no effect on the phase purity of support, it has a remarkable effect on porosity, crystal size, shape, and structure of micropores. After comparing characterization results, the developed support, based on TPAOH, was selected and modified by different metals (Ce, Ir, Ag, and Pd) using the incipient wetness co-impregnation method. Since there is an interaction between selectivity and conversion, the optimum metal content in the synthesized catalysts and reaction condition were determined to achieve the desired acetylene conversion and ethylene selectivity. The physicochemical transformation of the developed optimum catalysts was determined using different techniques. Based on the characterization and cata-test results, the catalyst which contains 0.29% Ir and 0.08% Pd presents a better performance and higher stability compared to the other catalysts due to the moderate size and mono layer dispersion of the metals on the support. The experimental results show that acetylene conversion and ethylene selectivity approach 97% and 92% at 55 • C, respectively.

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“…3,7 Using organic templates when synthesizing zeolites can cause problems, including high production costs, poisoning, air pollution and coke deposition on the catalyst after incomplete decomposition of the organic material. Consequently, many researchers have studied the synthesis of ZSM-5 without using templates, obtainig satisfactory results by varying the Si/Al ratio, 7 utilizing a hydrothermal synthesis with agitation, 8,9 comparing the syntheses under various templates, 4 using a two-step process that separates the nucleation step for crystallization, 3 using sulfuric acid, 10 using amorphous carbon and silica sources such as the rice hulls, 11 using a sol-gel method, 12 adding ZSM-11 seeds with a shorter crystallization time or using several sources of silicon, 13 aluminum and alkali metal cations. 14 Recently, a synthetic route for template-free ZSM-5, which was developed by Yu et al, involved inserting ZSM-11 seeds and decreasing the reaction time from 36 h to 12-16 h because the external surface area provided by the seeds accelerated the nucleation rate.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the small ZSM-5 crystals could be used to achieve high selectivity for C 2 -C 4 olefins in the methanol to olefins (MTO) reaction. 13 ZSM-5 has been used as a FCC catalyst since its discovery; however this material has only recently been applied for the pyrolysis of petroleum residues. According to Siddiqui et al, the cracking of Arab Heavy atmospheric residue is affected by the type of catalyst; ZSM-5 disfavors the formation of aromatic carbon and protons in asphaltene while selectively forming linear, low molecular weight hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Use of a Low-Cost Template-Free ZSM-5 for Atmospheric Petroleum Residue Pyrolysis

et al. 2016

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To understand the physicochemical properties and catalytic activity during the pyrolysis of atmospheric petroleum residue, a templatefree ZSM-5 zeolite was synthesized using a direct method without additional seeds or an organic structure director and compared with conventionally synthesized ZSM-5. The crystallinities of the two zeolites were evaluated by XRD and FTIR and were quite similar; however, structural analyses using SEM and argon physisorption revealed that the zeolites diverged in particle diameter and in the external surface area of the micropores. The synthesis procedure without a template incorporated additional aluminum into the crystalline network, according to ICP-AES and TPD NH 3 experiments. The catalytic pyrolysis performed over the template-free ZSM-5 generated results comparable to those for pyrolysis performed over the conventional ZSM-5 according to its hydrocarbon distribution. The selectivity to aromatics compounds was exactly the same for both ZSM-5 zeolites, and these values stand out compared to thermal pyrolysis. The template-free ZSM-5 produced 20% of light hydrocarbons (C 4 -C 6 ), where such compounds are olefins and paraffins of great interest to the petrochemical industry. Therefore, template-free ZSM-5 is promising for industrial use due to its lowered synthesis time, low-cost and significant distribution to light hydrocarbons.

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A fast organic template-free, ZSM-11 seed-assisted synthesis of ZSM-5 with good performance in methanol-to-olefin

Cited by 58 publications

References 45 publications

The role of supercritical water on the rapid formation of ZSM-5 nanocatalyst

The role of supercritical water on the rapid formation of ZSM-5 nanocatalyst

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

Use of a Low-Cost Template-Free ZSM-5 for Atmospheric Petroleum Residue Pyrolysis

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