Effect of Divalent Tin on the SnSAPO-5 Molecular Sieve and Its Modulation to Alumina Support To Form a Highly Efficient NiW Catalyst for Deep Hydrodesulfurization of 4,6-Dimethyldibenzothiophene

Abstract

The SnSAPO-5 molecular sieve containing divalent tin in the framework was successfully synthesized and analyzed by XRD, XPS, XRF, N 2 -asdorption desorption isotherms, NH 3 -TPD, Py-IR, and 27 Al and 31 P NMR. The results show that the trivalent aluminum is substituted by divalent tin in the framework of SnSAPO-5, generating a P((4−n)Al,nSn) (n = 1− 4) environment, which increases the number of Lewis and Brønsted acid sites. The five catalysts (NiW/SAPA, NiW/SnSAPA, NiW/APA, NiW/SnAPA, and NiW/EPA) with the same content of active metals were obtained by the incipient wetness coimpregnation method. The catalyst NiW/SnSAPA with higher k HDS and TOF exhibited a much higher HDS rate of 4,6dimethyldibenzothiophene (4,6-DMDBT) (85%) at 280 °C, while the HDS rates over the other catalysts are less than 40% (24%, 34%, 37%, and 29%, respectively), which is attributed to the catalyst NiW/SnSAPA possessing more suitable acidic sites, a higher sulfidation degree of W species, and a higher stacking number of WS 2 slabs. Futhermore, the catalyst NiW/SnSAPA has a much higher HDS rate (85%) for 4,6-DMDBT and exhibits a much higher performance of deep hydrodesulfurization in comparison to the catalyst NiW/EPA prepared with an industrial support (29%) at 280 °C. This finding has great practical significance for the development of ultradeep HDS industrial catalysts.

Atomic layer deposition of nano-scale molybdenum sulfide within a metal–organic framework for highly efficient hydrodesulfurization

“…S4, ESI †). 38 The pore structure of the synthesized AIM-60 was analyzed using a nitrogen physical adsorption and desorption isotherm. As shown in Fig.…”

“…For comparison, MoS 2 /g-Al 2 O 3 was also prepared by the incipient wetness coimpregnation method, according to the previous literature. 38 Typically, ammonium molybdate (50.8 mg) was added to deionized water (6.50 mL) and stirred until it was dissolved. g-Al 2 O 3 (5.00 g) was quickly added into the above solution, evenly stirred, sealed with plastic wrap, and sonicated for 15 min.…”

Selective Hydrogenation of Methyl Palmitate to Cetyl Alcohol via Ternary Synergistic Catalysis of Ni, Oxygen Vacancies, and Lewis Acid Sites under Mild Reaction Conditions

“…To confirm the interaction between the unsaturated V n + cations and the carbonyl group in fatty aldehydes, we conducted an in situ pyridine-IR experiment to probe the acidity of the catalyst with preadsorbed octanal. The spectra of fresh untreated Ni-VO x /SiO 2 featured peaks centered at 1450 and 1540 cm –1 and corresponded to Lewis and Brønsted acid sites, respectively (Figure A). , Notably, no desorption was observed until 150 °C, which suggests the strong interaction between pyridine and the V n + cations in Ni-VO x /SiO 2 . In contrast, after octanal preadsorption, most of the pyridine was completely desorbed at 150 °C (Figure B), which suggested that the abovementioned interaction was much weaker.…”

Hierarchical Hybrid Supports and Synthesis Strategies for Hydrodesulfurization of Recalcitrance Organosulfur Compounds

“…Sun et al [71] reported the use of Sn-modified-SAPO-5 mixed with alumina over NiW catalyst for HDS of 4,6-DMDBT with improved performance towards ultradeep activity (see Figure 5). In this study, a series of support composition matrices were prepared to reveal the synergy effect of Sn in the modified SAPO and SAPO-like molecular sieves support.…”

“…Sun et al [71] . reported the use of Sn‐modified‐SAPO‐5 mixed with alumina over NiW catalyst for HDS of 4,6‐DMDBT with improved performance towards ultradeep activity (see Figure 5).…”