Manipulating the mesostructure of silicoaluminophosphate SAPO-11 <i>via</i> tumbling-assisted, oriented assembly crystallization: a pathway to enhance selectivity in hydroisomerization

Jin, Dongliang; Li, Liyuan; Ye, Guanghua; Ding, Hongxin; Zhao, Xiaoling; Zhu, Kake; Coppens, MO

doi:10.1039/c8cy01483c

Cited by 31 publications

(15 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As listed in Table 4, the products were mainly C3 and C4 at a ratio around 1.00 (molar ratio), indicating that most cracking reactions occurred in the middle position of n-heptane with lower bond energy. It was generally agreed that small CP was created from mono-iC7 or multi-iC7 by b-scission, 42,55 and the C4 components in the CP were almost i-butane (iC4) (more than 99%) in previous reports such as Pt/ZSM-5 (22 times lower than parent Pt/ZSM-22) and Pt/ZSM-48 with 10 MR pore structures (Table S7, ESI †). However, it was noticeable that the n-butane (nC4) possessed a considerable proportion of the total C4 component of CP in the reaction process over parent and PZH catalysts.…”

Section: Resultsmentioning

confidence: 60%

“…Herein, x in the Si(xAl) referred to the number of Al atoms in the neighbouring sites of the Si-O bond. 41,42 The peak at approximately À102 ppm corresponded to (SiO) 3 -Si-OH sites on the external zeolite surface. 43 Moreover, two new peak signals were observed in the Z-0.7 support at a 29 Si chemical shift of around À95 and À90 ppm, which is often ascribed to Si(2Al) and Si(3Al).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Kai

Wang

et al. 2022

New J. Chem.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Kai

Wang

et al. 2022

New J. Chem.

View full text Add to dashboard Cite

show abstract

“…Py-IR was used to analyze the variations in Brønsted (B) acid sites and Lewis (L) acid sites in the Ni-modified SAPO-11 molecular sieves to determine the acidity of the different SAPO-11 samples ( Jin et al, 2018 ). Figure 5 shows the Py-IR spectra of the Ni-modified SAPO-11 samples generated using various procedures.…”

Section: Resultsmentioning

confidence: 99%

Hydroisomerization of n-Hexadecane Over Nickel-Modified SAPO-11 Molecular Sieve-Supported NiWS Catalysts: Effects of Modification Methods

et al. 2022

View full text Add to dashboard Cite

The complexation-excessive impregnation modification method, which was original in this study, and the ion-exchange method and the in situ modification method were used to synthesize Ni-modified SAPO-11 molecular sieves. With the Ni-modified SAPO-11 samples as support, the corresponding NiWS-supported catalysts for the hydroisomerization of n-hexadecane were prepared. The effects of Ni-modification on SAPO-11 characteristics and the active phase were studied. The structure, morphology, and acidity of SAPO-11, as well as the interaction between active metals and support, the morphology, dispersibility, and stacking number of the active phase, were all changed by Ni-modification methods. The complexation-excessive impregnation modification method deleted a portion of Al from SAPO-11 molecular sieves while simultaneously integrating Ni into the skeletal structure of the surface layer of SAPO-11 molecular sieves, considerably enhancing the acidity of SAPO-11 molecular sieves. Furthermore, during dealumination, ethylenediaminetetraacetic acid generated more mesoporous structures and increased the mesoporous volume of SAPO-11 molecular sieves. Because the complexation-excessive impregnation modification method increased the amount of Ni in the surface framework of the SAPO-11 molecular sieve, it has weakened the interaction between the active phase and the support, improved the properties of the active phase, and greatly improved the hydroisomerization performance of NiW/NiSAPO-11. The yield of i-hexadecane of NiW/NiSAPO-11 increased by 39.3% when compared to NiW/NiSAPO-11. It presented a realistic approach for increasing the acidity of SAPO-11, reducing the interaction between active metals and support, and improving the active phase stacking problem.

show abstract

“…44 Further, in the case of Ni(Pz)-E-PVP, relatively high uptake of N 2 at P/P o close to 1.0 is observed due to capillary effects attributable to the existence of the large void as a result of the lamellar assembly of nanorods offering lamellar channels/pores. 45 So, the porosity in Ni(Pz)-E-PVP mainly originates from the micropores within the nanorods as well as the wide pores due to the lamellar channels between the nanorod assembly. The pore size distribution curves shown in Figure 4b reveal the micropore peaks centered at 0.435, 0.518, 0.507, 0.502, and 0.896 nm for Ni(Pz)-E-PVP, Ni(Pz)-E-SDS, Ni(Pz)-E-CTAB, Ni(Pz)-E, and Ni(Pz)-M, respectively.…”

Section: Resultsmentioning

confidence: 99%

Promoting the Oxygen Evolution Reaction via Morphological Manipulation of a Lamellar Nanorod-Assembled Ni(II)-Pyrazolate Superstructure

Farid

Mao

Ren

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Nanoscale pyrazolate-based coordination polymers (CPs) are becoming increasingly popular as electrocatalysts owing to their customizable compositions and structures. However, using them for oxygen evolution reaction (OER) is highly challenging due to their unsatisfactory catalytic efficiency and relatively low stability. Herein, a simple one-step solvothermal process was employed for the fabrication of polycrystalline nickel-pyrazolate [Ni(Pz)] with an unusual lamellar nanorod-assembled microsphere morphology for the first time using ethanol as a green organic solvent via controlling other physical parameters. Meanwhile, the Ni(Pz) structure and morphology are investigated to derive its formation process following the different monomeric feed ratios relying on the metal/ligand interactions of CP. Shaping the Ni(Pz) electrocatalyst in well-oriented lamellar nanorod-assembled microspheres brings the advantage of porosity and high specific surface area, which expedites mass/charge transport and contact with the electrolyte as well as creates less tortuous pathways for charge distribution, thus improving the charge homogeneity. These high-class structural features and polycrystalline nature of Ni(Pz)-E-PVP facilitate amazing catalytic OER activity with a low overpotential of 290 mV at 10 mA cm–2 and a Tafel slope of only 94 mV dec–1 beyond the yardstick material (i.e., RuO2) in alkaline solution. A suite of measurements, entailing X-ray photoelectron spectroscopy and density functional theory calculations, suggest that the rich Ni–N4 moieties in Ni(Pz)-E-PVP are central species providing adsorption sites for OER intermediates. This facile protocol is prophesied to commence the imminent development of noble metal-free, effective, and low-priced electrocatalysts for OER.

show abstract

Manipulating the mesostructure of silicoaluminophosphate SAPO-11 via tumbling-assisted, oriented assembly crystallization: a pathway to enhance selectivity in hydroisomerization

Abstract: A house-of-cards architecture of silicoaluminophosphate was fabricated to enhance selectivity for hydroisomerization.

Cited by 31 publications

References 93 publications

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Hydroisomerization of n-Hexadecane Over Nickel-Modified SAPO-11 Molecular Sieve-Supported NiWS Catalysts: Effects of Modification Methods

Promoting the Oxygen Evolution Reaction via Morphological Manipulation of a Lamellar Nanorod-Assembled Ni(II)-Pyrazolate Superstructure

Contact Info

Product

Resources

About