Diffusion Coefficients of Carbon Dioxide Within Type 13x Zeolite Particles

Kamiuto, Kouichi; Goubaru, Asami; Ermalina,

doi:10.1080/00986440500193970

Cited by 23 publications

(15 citation statements)

References 4 publications

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“…Between 293 and 298 K, the activation energies based on the Cahn electrobalance analysis of CO 2 diffusion in CaX as well as the gravimetric analysis of CO 2 diffusion into zeolite 5A are approximately 16 and 30 kJ mol −1 , respectively (Ahn et al 2004;Kamiuto and Goubaru 2006). These values compare well with the FRT-ZLC predicted measurements of 17 and 22 kJ mol −1 for zeolites F.CP914 and ZSM 280 at similar temperatures.…”

Section: Methodssupporting

confidence: 72%

Flux Response Technology (FRT) Applied in Zero Length Column Diffusivity and Adsorption Measurements

Sasegbon

Hellgardt

2015

Transp Porous Med

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The adaptation of flux response technology (FRT) as a novel in situ perturbation technique in gas sorption measurements continues to yield consistent results with literature values. Earlier studies have successfully reported on the FRT-zero length column method of studying propane diffusivity within an alumina/CeZrOx washcoat as a function of temperature (Maguire et al. in Chem Eng Sci 87:224-233, 2013; Sasegbon and Hellgardt in Adsorption, 2012). This study details FRT's ability in quantifying and analysing the dynamic process of carbon dioxide (CO 2 ) adsorption on zeolites with varying Si/Al ratios as well as measurements of CO 2 diffusion coefficients without the need for running separate experiments. This is made possible because FRT measures miniscule changes in transient flows in the order of 10 −2 µl/min for gaseous processes involving a change in volume (dV /dt). These changes are measured directly by a very sensitive differential pressure transducer in a pneumatic system analogous to an electrical Wheatstone bridge assembly, whereby gas molecules replace electrons and capillaries function as resistors.

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Section: Methodssupporting

confidence: 72%

Flux Response Technology (FRT) Applied in Zero Length Column Diffusivity and Adsorption Measurements

Sasegbon

Hellgardt

2015

Transp Porous Med

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“…The distinction in the desorption activation energy of different conditions, in which different gases are used as the carrier gas after the adsorption stage, is due to the different adsorption status of CO 2 . When CO 2 is used as the carrier gas (written as condition 1), the value of E ranges from 12.15 to 14.12 kJ mol −1 and is comparable to the estimated activation energy calculated by Kamiuto et al. (2006) (11.7 kJ mol −1 ), which is frequently used in the characterization of the mass transfer rate of the adsorbate on the open surface of the adsorbent.…”

Section: Resultssupporting

confidence: 54%

Desorption characteristics and kinetic parameters determination of molecular sieve by thermogravimetric analysis/differential thermogravimetric analysis technique

Guo

Zhang

Liu

2018

Adsorption Science & Technology

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The kinetics of the thermal desorption of CO 2 adsorbed on zeolite 13X were obtained using a differential thermogravimetric analyser under two different carrier gas conditions. The varying heating rates were set as 8, 12, 16, and 20 K min À1, respectively. The desorption activation energy of the physisorption sites for this experiment evaluated by an integral method without prediction of the reaction order ranged from 12.15 to 14.12 kJ mol À1 (CO 2 as the carrier gas) and 43.32 to 50.42 kJ mol À1 (Ar as the carrier gas), respectively. The desorption activation energy of the chemisorption sites ranged from 57.95 to 58.53 kJ mol À1 (CO 2 as the carrier gas) and 74.02 to 79.92 kJ mol À1 (Ar as the carrier gas), respectively.

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“…Such combined processes were introduced in the literature with the Gemini process developed by Air Products and Chemicals Inc. [21,33,38]. The Gemini process is an adsorption process with two trains of in total 8 or 9 columns, that are interconnected during part of the cycle, but undergo a completely different sequence of steps for regeneration.…”

Section: Introductionmentioning

confidence: 99%

Adsorption for efficient low carbon hydrogen production: part 1—adsorption equilibrium and breakthrough studies for H2/CO2/CH4 on zeolite 13X

Streb

Mazzotti

2021

Adsorption

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Reforming of fossil fuels coupled with carbon capture and storage has the potential to produce low-carbon H2 at large scale and low cost. Adsorption is a potentially promising technology for two key separation tasks in this process: H2 purification and CO2 capture. In this work, we present equilibrium adsorption data of H2 and CH4 on zeolite 13X, in addition to the already established CO2 isotherms. Further, we carry out binary (CO2–CH4) and ternary (H2–CO2–CH4) breakthrough experiments at various pressures and temperatures to estimate transport parameters, assess the predictive capacity of our 1D column model, and compare different multi-component adsorption models. CO2 adsorbs strongly on zeolite 13X, CH4 adsorbs less, and H2 adsorbs very little. Thus, H2 breaks through first, CH4 second (first in the binary breakthrough experiments) and CO2 last. Linear driving force (LDF) mass transfer coefficients are estimated based on a single breakthrough experiment and mass transfer is found to be fast for H2, slower for CH4, and slowest for CO2. The LDF parameters can be used in a predictive manner for breakthrough experiments at varying pressures, temperatures, flows, and, though with lower accuracy, even compositions. Heat transfer inside the column is described well with a literature correlation, thus yielding an excellent agreement between simulated and measured column temperatures. Ideal and real adsorbed solution theories (IAST and RAST, respectively) both model the observed breakthrough composition profiles well, whereas extended isotherms are inferior for predicting the competitive behavior between CH4 and CO2 adsorption. This study provides the groundwork necessary for full cyclic experiments and their simulation.

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Diffusion Coefficients of Carbon Dioxide Within Type 13x Zeolite Particles

Cited by 23 publications

References 4 publications

Flux Response Technology (FRT) Applied in Zero Length Column Diffusivity and Adsorption Measurements

Flux Response Technology (FRT) Applied in Zero Length Column Diffusivity and Adsorption Measurements

Desorption characteristics and kinetic parameters determination of molecular sieve by thermogravimetric analysis/differential thermogravimetric analysis technique

Adsorption for efficient low carbon hydrogen production: part 1—adsorption equilibrium and breakthrough studies for H2/CO2/CH4 on zeolite 13X

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