SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ye Li,Yong Wang,Honghao Bai,Shishuai Li,Xiaomin Li,Xiaoqing Wang,Libo Li,Jinping Li,Jiangfeng Yang
The economically efficient separation of ethane (C 2 H 6 )/ethylene (C 2 H 4 ) presents challenges in the petrochemical industry, and the use of traditional adsorbents zeolite provides a reliable guarantee for maintaining the economic viability of adsorption separation technology. In this study, we investigate the impact of different silica-alumina ratios (SiO 2 /Al 2 O 3 = 40, 500, and 1500) of high silica zeolites ZSM-11 on the C 2 H 6 /C 2 H 4 separation performance to develop efficient C 2 H 6 selective adsorbents. The results show that the C 2 H 6 adsorption capacity and C 2 H 6 /C 2 H 4 selectivity of ZSM-11 increase as the silica-alumina ratios increases. The pure silica zeolite (ZSM-11(1500)) exhibits the highest adsorption capacity for C 2 H 6 (59.19 cm 3 /g) and the highest selectivity for C 2 H 6 /C 2 H 4 (2.04), which were superior to ultra-high silica sample (ZSM-11(500)) (55.06 cm 3 /g and 1.62, respectively) and high silica sample (ZSM-11(40)) (47.28 cm 3 /g and 1.23, respectively), at 273 K and 1 bar. The mixed gas breakthrough experiments results show that pure silica sample has outstanding C 2 H 6 /C 2 H 4 separation ability. The PSA simulation calculated data demonstrating promising potential for industrial applications. Importantly, this separation performance remains unaffected even in the presence of H 2 O.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2016
·Vol. 2016
·期 9
·1364-1368
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IF 2.686
Yeqing Wang,Chenqi Zhu,Jing Qiu,Fan Jiang,Xiangju Meng,Xiong Wang,Chi Lei,Yinying Jin,Shuxiang Pan,Feng-Shou Xiao
Graphical A high-silica aluminosilicate zeolite with a TON structure designated as ZJM-4 was successfully synthesized in the absence of any organic templates and zeolite seeds. This route has efficient silica utilization, and the zeolite product has a stable tetrahedral aluminum species. A high-silica zeolite with a TON structure designated as ZJM-4 was successfully synthesized in the absence of any organic templates and zeolite seeds. Many factors such as the SiO 2 /K 2 O ratio, Si/Al ratio, SiO 2 /H 2 O in the starting aluminosilicate gels, crystallization temperature, and crystallization time strongly influence the formation of the ZJM-4 zeolite. Interestingly, this synthesis shows very efficient silica utilization in the starting gels (>80 %). Catalytic tests on the isomerization of m -xylene to p -xylene show that the ZJM-4 catalyst has high selectivity to p -xylene (ca. 80 %), which could be potentially important for industrial applications for the ZJM-4 zeolite as a candidate catalyst in the future.
研究领域:
材料化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
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2018
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IF 4.667
Chaoqun Bian,Fang Chen,Ling Zhang,Weiping Zhang,Xiangju Meng,Stefan Maurer,Daniel Dai,Andrei-Nicolae Parvulescu,Ulrich Müller,Feng-Shou Xiao
High silica chabazite zeolite (CHA) is very important for selective catalytic reduction of NOx with ammonia (NH 3 -SCR), but its synthesis is time-consuming under conventional hydrothermal conditions (160 °C for 90–120 h). Herein, we report a novel strategy for highly efficient synthesis of CHA zeolite by means of fast crystallization at high temperatures in the absence of water solvent (240 °C for 1.5 h). X-ray diffraction, N 2 -adsorption isotherms, inductively coupled plasma, scanning electron microscopy, 29 Si and 27 Al MAS NMR, as well as thermogravimetry-differential thermal analysis suggest that the samples have high quality. This concept significantly enhances the space-time yields (STY) for CHA zeolite prepared from high-temperature synthesis in the absence of water solvent (almost two orders of magnitude higher than those of conventional hydrothermal synthesis). Moreover, compared with hydrothermal synthesis, the samples obtained from fast crystallization at higher temperatures (Si/Al = 12, 2.0% Cu loading) shows enhanced catalytic performance at 350–550 °C in NH 3 -SCR.
研究领域:
材料化学
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催化化学
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无机合成
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环境化学
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能源化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2020
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IF 6.146
Huimin Luan,Chi Lei,Ye Ma,Qinming Wu,Longfeng Zhu,Hao Xu,Shichao Han,Qiuyan Zhu,Xiaolong Liu,Xiangju Meng,Feng-Shou Xiao
In this work, we show for the first time that high-silica zeolites (MFI, TON, MTT, and *MRE) could be synthesized from a combined strategy of both zeolite seeding and alcohol filling in the absence of organic structure-directing agents (OSDAs). High-silica ZSM-5 zeolites with Si/Al ratios ranging from 38 to 240 (TF-Al-ZSM-5) could be synthesized via this route. The key to the success of this technique was the employment of an aluminosilicate precursor with a fully 4-coordinated aluminum species as the initial source, wherein the rearrangement and condensation of the silicate species, rather than the aluminate species, occurred during zeolite crystallization. In addition, heteroatoms, such as Fe and B, could be incorporated into the zeolite frameworks. Catalytic tests for the methanol-to-propylene (MTP) reaction exhibited good catalytic performance for TF-Al-ZSM-5, which was comparable to that of the aluminosilicate ZSM-5 zeolite synthesized with OSDAs. Hence, this method offers viable opportunities for the industrial production and catalytic application of high-silica zeolites in the future.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）