The Effect of Zn on Offretite Zeolite Properties. Acidic Characterizations and NH<sub>3</sub>-TPD Desorption Models

Aponte, Yira; Lasa, Hugo de

doi:10.1021/acs.iecr.6b04474

Cited by 22 publications

(13 citation statements)

References 57 publications

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“…From the NH 3 -TPD curve of Nafion 117 membrane shown in Figure 2a, it can be seen that the two desorption peaks, ascribed to the physical adsorption (170 °C) and chemical adsorption (270 °C) of ammonia on Nafion membrane, respectively, can be observed obviously. [12] This result meant that the Nafion membrane exhibited strong adsorption capacity for ammonia, attributed to a lot of Brønsted acid sites in the membrane. The FTIR spectra of original Nafion 117 membrane and Nafion 117 membrane treated by soaking in ammonia-containing electrolyte are presented in Figure 2b.…”

Section: Electrocatalytic N 2 Reductionmentioning

confidence: 99%

“…The NH 3 temperature‐programmed desorption (NH 3 ‐TPD), Fourier transform infrared (FTIR) spectrum, and elemental analysis were employed to investigate the adsorption behavior of ammonia onto Nafion membrane. From the NH 3 ‐TPD curve of Nafion 117 membrane shown in Figure a, it can be seen that the two desorption peaks, ascribed to the physical adsorption (170 °C) and chemical adsorption (270 °C) of ammonia on Nafion membrane, respectively, can be observed obviously . This result meant that the Nafion membrane exhibited strong adsorption capacity for ammonia, attributed to a lot of Brønsted acid sites in the membrane.…”

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confidence: 92%

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Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N₂ Reduction?

Ren

Tan

et al. 2019

Small Methods

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The electrocatalytic N2 reduction reaction (ENRR) to ammonia has attracted much attention due to the mild operating conditions, in which the Nafion membrane is generally adopted to separate the ammonia from the anode products. However, it has been mentioned that the Nafion membrane allows ammonia to pass through and traps the ammonia to some extent, but powerful confirmation experiments and effective solutions are still lacking. Herein, it is experimentally confirmed that the use of the Nafion membrane in the ENRR is inappropriate, based on the results that the ammonia can pass through the membrane, be adsorbed on the membrane, and interact with the membrane. This causes a measurement error and accelerates the membrane degradation process, which is unfavorable for ammonia quantification and the long‐term stability operation of the ENRR in practical application. Also, for the first time, a more accurate method to evaluate the activity of the ENRR electrocatalyst using a salt bridge to replace the Nafion membrane is presented.

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Section: Electrocatalytic N 2 Reductionmentioning

confidence: 99%

mentioning

confidence: 92%

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N₂ Reduction?

Ren

Tan

et al. 2019

Small Methods

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“…According to previous studies, 30,31 the peaks produced at temperatures above 400 C are generally attributed to the desorption of NH 3 from strong Brönsted and Lewis sites, while the low-temperature peaks can be attributed (a) desorption of weakly adsorbed NH 3 at weak acid sites or non-acidic sites, (b) weak acid Brönsted and Lewis sites, and (c) formation of NH 4+ (NH 3 ) n groups. 30 During calcination, Ni/SBA-15 and Ni/Al-SBA-15 were quickly increase, 32 and this led to higher strong acid sites and a shi of NH 3 -TPD peaks toward higher temperatures.…”

Section: )mentioning

confidence: 99%

Evaluation of hydrodeoxygenation reactivity of pyrolysis bio-oil with various Ni-based catalysts for improvement of fuel properties

Choi

et al. 2017

RSC Adv.

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“…of methods, involving Fourier transform infrared spectroscopy (FT-IR), [85,86] ammonia temperature-programmed desorption (NH -TPD), [85,87] solid-state nuclear magnetic resonance (ssNMR), [88] chemical titration, and adsorption microcalorimetry, [89] which substantially determine the adsorption strength of probe molecules on zeolite.…”

Section: The Confinement Effect On Catalyst Acid Strengthmentioning

confidence: 99%

Recent Advances in Catalytic Confinement Effect within Micro/Meso‐Porous Crystalline Materials

Dai

Zhang

2021

Small

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Among them, great efforts have been made to elucidate the correlations between the reaction performance and the specific physical properties of the catalyst. During this period, some secondary concepts were introduced and widely discussed such as strong metal-support interaction (SMSI), [8][9][10][11][12] hydrogen spillover, [13,14] and the confinement effect, [15][16][17][18] etc.The "confinement effect" is a vital factor affecting the reaction, focusing prominently on porous materials. It mainly includes the physical constraint effect, [19,20] the electronic effect, [21] and the molecular enrichment effect. [22][23][24] The confinement effect was introduced for the first time on zeolite catalysts by constructing a spherical confined model to estimate van der Waals adsorption energies. [25] Since then, some other zeolites, [18,26] carbon nanotubes (CNTs), [27][28][29][30] and metal-organic frameworks [31,32] (MOFs) have been stepwisely involved in this specific topic to explain the correlation between the properties of a specific local environment and the reaction activity. The most prominent feature in confinement effect is the separation of catalyst on substrate molecules based on the size of the molecules, which is also called the physical constraint effect. The catalytic performance depends on a great extent on the precise match between the size/shape of confined space and substrate, while the other effects exist in confined space due to the nature of catalysts. The structural, physical, and chemical properties of zeolites, CNTs, and MOFs are summarized in Table 1. Albeit they all have some characteristics such as well crystallinity, high surface area, and uniform pores/channels, they differ in many significant aspects as discussed below.The confinement effect in the solid acid-base catalytic system has been substantially described and summarized by Iglesia [33][34][35][36][37][38] and Lercher et al. [39,40] Zeolite, as the most representative crystalline solid acid catalyst with periodically designed pore structure, has been widely applied in both fundamental and applied catalytic research. It exhibits diverse frameworks and tunable pore structures, [41,42] and features exceptional chemical and thermal stability, as well as unique Lewis and Brønsted acid sites. [43] Iglesia et al. suggested that the confined location of Brønsted acid sites in zeolites played an essential role in the catalytic consequences. [23] Furthermore, through extensive works, using zeolite as a host, they concluded

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The Effect of Zn on Offretite Zeolite Properties. Acidic Characterizations and NH₃-TPD Desorption Models

Cited by 22 publications

References 57 publications

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N₂ Reduction?

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N₂ Reduction?

Evaluation of hydrodeoxygenation reactivity of pyrolysis bio-oil with various Ni-based catalysts for improvement of fuel properties

Recent Advances in Catalytic Confinement Effect within Micro/Meso‐Porous Crystalline Materials

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The Effect of Zn on Offretite Zeolite Properties. Acidic Characterizations and NH3-TPD Desorption Models

Cited by 22 publications

References 57 publications

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N2 Reduction?

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N2 Reduction?

Evaluation of hydrodeoxygenation reactivity of pyrolysis bio-oil with various Ni-based catalysts for improvement of fuel properties

Recent Advances in Catalytic Confinement Effect within Micro/Meso‐Porous Crystalline Materials

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The Effect of Zn on Offretite Zeolite Properties. Acidic Characterizations and NH₃-TPD Desorption Models

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N₂ Reduction?

Is It Appropriate to Use the Nafion Membrane in Electrocatalytic N₂ Reduction?