Improved AlPO-18 membranes for light gas separation

Wang, Bin; Hu, Na; Wang, Huamei; Zheng, Yu-Jun; Zhou, Rongfei

doi:10.1039/c5ta01260k

Cited by 69 publications

(40 citation statements)

References 31 publications

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“…Inorganic membranes have good hydrothermal stability, mechanical strength, and chemical resistance, which are promising candidates for gas separation [8]. Recently, zeolite membranes, such as zeolite T, DDR, MFI, CHA, and metal-organic framework (MOF) membranes have gained much attention for natural gas purification [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. …”

Section: Introductionmentioning

confidence: 99%

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

et al. 2018

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Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO2/Al2O3 ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO2 and CH4) of the high silica SSZ-13 zeolite membrane was decreased with the SiO2/Al2O3 ratio in the precursor synthesis gel, while the ideal CO2/CH4 selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H2O/SiO2 and RNOH/SiO2 ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes were studied in detail. Medium H2O/SiO2 and RNOH/SiO2 ratios in the initial synthesis gel were crucial to prepare the good CO2 perm-selective SSZ-13 zeolite membrane. When the molar composition of precursor synthesis gel, crystallization temperature and time were 1.0 SiO2: 0.1 Na2O: 0.1 TMAdaOH: 80 H2O, 160 °C and 48 h, CO2 permeance and ideal CO2/CH4 selectivity of the SSZ-13 zeolite membrane were 0.98 × 10−7 mol/(m2·s·Pa) and 47 at 25 °C and 0.4 MPa. In addition, the SiO2/Al2O3 ratio of the corresponding SSZ-13 zeolite was 410 by X-ray fluorescence spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

et al. 2018

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“…46 The adsorption isotherms at 140 kPa which corresponded to the transmembrane pressure used during the separation experiments showed CH 4 uptakes of 12 and 15 cm 3 /g at 298 K and 278 K, respectively, and N 2 uptakes of 4.5 and 10 cm 3 /g, respectively, (Fig. 6).…”

Section: Membrane Separation Mechanisms a Carbon Molecular Sievmentioning

confidence: 97%

“…44 Later reports by Zhou group confirmed the molecular sieving properties of AlPO-18 membranes for CO 2 /CH 4 , CO 2 /N 2 , and H 2 /CH 4 binary gas mixtures. 45,46 Inspired by the molecular sieving ability of AlPO-18 membranes for these binary gas mixtures, our group recently reported the separation performance of this AlPO for N 2 /CH 4 mixtures. 47 These AlPO-18 membranes were grown via secondary seeded growth on alumina porous tubes.…”

Section: Alumino Phosphate Membranes For N 2 /Ch 4 Separationmentioning

confidence: 99%

Molecular sieve membranes for N₂/CH₄separation

Carreón

2017

J. Mater. Res.

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Natural gas consumption has grown from 5.0 trillion cubic feet (TCF) in 1949 to 27.0 TCF in 2014 and is expected to be ;31.6 TCF in 2040. This large demand requires an effective technology to purify natural gas. Nitrogen is a significant impurity in natural gas and has to be removed since it decreases the natural gas energy content. The benchmark technology to remove nitrogen from natural gas is cryogenic distillation, which is costly and energy intensive. Membrane technology could play a key role in making this separation less energy intensive and therefore economically feasible. Molecular sieve membranes are ideal candidates to remove natural gas impurities because of their exceptional size-exclusion properties, high thermal and chemical resistance. In this review, the state of the art of molecular sieve membranes for N 2 /CH 4 separation, separation mechanisms involved, and future directions of these emerging membranes for natural gas purification are critically discussed. I. NATURAL GAS GENERALITIESThe United States is the world's largest producer of natural gas.1 As of 2015, the United States produces 28.8 trillion cubic feet (TCF) of natural gas per year.2 The United States natural gas production has been increasing every year since 2010, 3 and this increase in production can, in part, be contributed to the increasing use of fracking and other technologies that release previously untapped natural gases in shale.3 According to US Energy Information Administration, the natural gas consumption is expected to rise to 31.6 TCF in 2040. 4 Processing of natural gas is by far the largest industrial gas separation application. 5 Every year close to 100 trillion standard cubic feet of natural gas are used worldwide. This large demand requires an effective technology to process and purify natural gas.Natural gas consists primarily of methane, higher alkanes, carbon dioxide, nitrogen, and hydrogen sulfide as shown in Table I. In particular CO 2 and N 2 decrease the heat value of the natural gas. Therefore, it is highly desirable to remove CO 2 and N 2 from natural gas to improve its heat content, and to avoid the erosion of pipelines from CO 2 in the presence of moisture.Approximately 14% of US natural gas contains .4% N 2 .5 However, most pipeline standards require that natural gas contains less than 4% inert gases. N 2 dilutes the heating value of the gas, resulting in lower British thermal units. In the process of purification, it is highly desirable to maintain the gas at high pressure when explored to save recompression costs. In this respect, it is necessary to develop efficient processes to remove N 2 from natural gas. II. NATURAL GAS NITROGEN REJECTION TECHNOLOGIESNitrogen rejection is a challenging technical separation because of the similar molecular size of N 2 (;0.36 nm) His research focuses on molecular gas separations, heterogeneous catalysis, and gas storage, and aims at tackling relevant societal issues related to energy and environment, including carbon dioxide capture and utilization, biomass convers...

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“…For the AlPO‐18 membrane (Figure a), the CO 2 permeance gradually decreased and the separation factor was significantly reduced from 1200 to 200 with the increasing operation temperature. This phenomenon was consistent with reports that CO 2 molecules were adsorbed onto the framework and reduced permeation, whereas CH 4 molecules continuously penetrated, because CO 2 has a higher heat of adsorption than CH 4 . As a result, the CO 2 permeance and CO 2 /CH 4 separation factor kept decreasing at high separation temperatures.…”

Section: Figurementioning

confidence: 99%

“…[11,12] These small-pore zeolitic materials are appropriate candidates for the selective separation of CO 2 from gas mixtures. The established procedure to grow these aluminophosphate membranes on porous substrates involves immersion of the substrate coated with the seed particles in as ynthesis gel containing aluminumi sopropoxide (AIP), H 3 PO 4 ,tetraethylammoniumh ydroxide( TEAOH), and deionized double-distilled water (DDW)i nt he case of AlPO-18 [13][14][15][16][17][18] or AIP,H 3 PO 4 ,L udox (commercial colloidal silica), TEAOH, dipropylamine (DPA), and DDW in the case of SAPO-34. [19][20][21][22][23][24][25][26][27][28] The hydrothermal reactionw as carried out under the conditions outlined in the Methods section in the Supporting Information.…”

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confidence: 99%

Gelless Secondary Growth of Zeolitic Aluminophosphate Membranes on Porous Supports with High Performance in CO₂/CH₄ Separation

Nguyen

et al. 2020

ChemSusChem

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Zeolitic aluminophosphate, a three‐dimensional microporous material, with an average pore size of 0.38 nm is good candidate for molecular sieve application in CO2 gas separation. The separation of CO2/CH4 gas mixtures for precombustion processes is desirable from the standpoint of both environmental concerns and energy efficiency. This study concerns an environmentally friendly method to synthesize zeolitic aluminophosphate thin films on various configurations and low‐cost kaolin porous substrates with high performance in the separation of CO2/CH4 mixtures. The membranes are prepared by a gelless seed growth method that uses lower amounts of chemicals, forms no liquid gel, chemical waste, or byproducts and generates no washing water. The obtained membranes show very high selectivity for CO2 with a CO2/CH4 separation factor above 1000 in the separation of CO2/CH4 gas mixtures.

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Improved AlPO-18 membranes for light gas separation

Cited by 69 publications

References 31 publications

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Molecular sieve membranes for N₂/CH₄separation

Gelless Secondary Growth of Zeolitic Aluminophosphate Membranes on Porous Supports with High Performance in CO₂/CH₄ Separation

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Improved AlPO-18 membranes for light gas separation

Cited by 69 publications

References 31 publications

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Molecular sieve membranes for N2/CH4separation

Gelless Secondary Growth of Zeolitic Aluminophosphate Membranes on Porous Supports with High Performance in CO2/CH4 Separation

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Product

Resources

About

Molecular sieve membranes for N₂/CH₄separation

Gelless Secondary Growth of Zeolitic Aluminophosphate Membranes on Porous Supports with High Performance in CO₂/CH₄ Separation