Catalytic Performance of NiMoS Supported on (Zr)SBA-15 for Hydrodesulfurization of Diesel: Insight into a One-Step Calcination and Reduction Strategy during Sulfidation

2019 ◽  
Vol 33 (4) ◽  
pp. 3047-3056 ◽  
Author(s):  
Saheed A. Ganiyu ◽  
Khalid Alhooshani
Author(s):  
Youlin Li ◽  
Yu Hu ◽  
Wenqiao You ◽  
Guangming Zhou ◽  
Guilong Peng

Abstract Activated carbon/CuO (AC/CuO) composites was prepared through a facile one-step hydrothermal method and used as a bifunctional material for adsorption and catalysis degradation of bisphenol A (BPA). The composite was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray powder diffraction (XRD). The obtained AC/CuO exhibited excellent adsorption and catalytic performance. The maximum adsorption capacity of BPA on the AC/CuO was 319.03 mg/g according to the Langmuir fitting. At an initial BPA concentration of 20 mg/L, the BPA degradation efficiencies were maintained above 96% for 15 min by using 20 mg/L AC/CuO and 2 mM peroxymonosulfate (PMS). Moreover, the relationship between adsorption and catalytic degradation was also investigated. The results indicated that the pre-adsorption disfavored the degradation reaction. This work not only provides a novel preparation method for AC/CuO catalyst, but also gives a deeper insight into the mechanisms between adsorption and catalytic degradation.


Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 488
Author(s):  
Katarzyna Stawicka ◽  
Maciej Trejda ◽  
Maria Ziolek

Niobium containing SBA-15 was prepared by two methods: impregnation with different amounts of ammonium niobate(V) oxalate (Nb-15/SBA-15 and Nb-25/SBA-15 containing 15 wt.% and 25 wt.% of Nb, respectively) and mixing of mesoporous silica with Nb2O5 followed by heating at 500 °C (Nb2O5/SBA-15). The use of these two procedures allowed obtaining materials with different textural/surface properties determined by N2 adsorption/desorption isotherms, XRD, UV-Vis, pyridine, and NO adsorption combined with FTIR spectroscopy. Nb2O5/SBA-15 contained exclusively crystalline Nb2O5 on the SBA-15 surface, whereas the materials prepared by impregnation had both metal oxide and niobium incorporated into the silica matrix. The niobium species localized in silica framework generated Brønsted (BAS) and Lewis (LAS) acid sites. The inclusion of niobium into SBA-15 skeleton was crucial for the achievement of high catalytic performance. The strongest BAS were on Nb-25/SBA-15, whereas the highest concentration of BAS and LAS was on Nb-15/SBA-15 surface. Nb2O5/SBA-15 material possessed only weak LAS and BAS. The presence of the strongest BAS (Nb-25/SBA-15) resulted in the highest dehydration activity, whereas a high concentration of BAS was unfavorable. Silylation of niobium catalysts prepared by impregnation reduced the number of acidic sites and significantly increased acrolein yield and selectivity (from ca. 43% selectivity for Nb-25/SBA-15 to ca. 61% for silylated sample). This was accompanied by a considerable decrease in coke formation (from 47% selectivity for Nb-25/SBA-15 to 27% for silylated material).


2021 ◽  
Vol 616 ◽  
pp. 118081
Author(s):  
Pavlo I. Kyriienko ◽  
Olga V. Larina ◽  
Dmytro Yu. Balakin ◽  
Anatolii O. Stetsuk ◽  
Yurii M. Nychiporuk ◽  
...  

1998 ◽  
Vol 15 (5) ◽  
pp. 505-509
Author(s):  
Tian-Cun Xiao ◽  
Hai-Tao Wang ◽  
Yu-Li Lu ◽  
Li-Dun An ◽  
Hong-Li Wang

Author(s):  
Diana Lawryshyn

Ukrainian folk music has been embedded into much of the classical music we hear. Mykola Leontovych and Peter Wilhousky are credited for the ever-famous piece Carol of the Bells, an arrangement of a Ukrainian Epiphany carol called Shchedryk (Щедрик). Despite the applicability of Ukrainian folk-inspired music in our society, people are generally unaware of its origin. In fact, researcher Yakov Soroker provides evidence of Ukrainian folk inspiration in various classical pieces being misclassified as Russian, Polish, and/or Hungarian. Ukrainian classical music, for many reasons pertaining to its unstable history, is not well known outside Ukraine and, therefore, is rarely discussed. This has limited potential insights it might bring to those who have interest in its place in Western music. My research explores the influence that Ukrainian folk traditions have had on contemporary classical music. My research has come from gathering and sifting through historical literature about the origins of classical, Ukrainian classical, Ukrainian folk, and other folk music works. I have also listened to selected works and examined the critiques of experts to form conclusions about how composers today have been influenced, knowingly or otherwise, by Ukrainian folk music. Going one step further, in order to provide a deeper, practical insight into the creative process of composers who have been influenced by Ukrainian folk music, I have composed a piece of my own influenced by Ukrainian folklore. 


RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 4984-4992 ◽  
Author(s):  
Xian Zhang ◽  
Yaxin Li ◽  
Guiying Li ◽  
Changwei Hu

The loading of iron and the formation of activated carbon were combined to one step and the thus-obtained Fe/activated carbon showed good catalytic performance for phenol hydroxylation.


RSC Advances ◽  
2015 ◽  
Vol 5 (29) ◽  
pp. 23080-23085 ◽  
Author(s):  
Peigen Zhang ◽  
Jian Zhang ◽  
Anjian Xie ◽  
Shikuo Li ◽  
Jiming Song ◽  
...  

A one step method has been developed for the fabrication of hierarchical flower-like bismuth tungstate (Bi2WO6) hollow spheres via a solvothermal process.


2018 ◽  
Vol 25 (19) ◽  
pp. 18424-18433 ◽  
Author(s):  
Jun Zhang ◽  
Yu Tian ◽  
Linlin Yin ◽  
Jie Zhang ◽  
Jörg E. Drewes

2021 ◽  
Author(s):  
He-qiang Chang ◽  
Guo-Hua Zhang ◽  
Kuo-Chih Chou

Abstract In order to evaluate the effect of precursors and synthesis strategies on catalytic ability of Mo2C in the hydrogen evolution reaction (HER), four kinds of Mo2C were synthesized using two kinds of MoO3 by two strategies. Compared with the one-step direct carbonization strategy, Mo2C with a large special surface area and a better performance could be synthesized by the two-step strategy composed of a nitridation reaction and a carbonization reaction. Additionally, the as-prepared porous Mo2C nanobelts (NBs) exhibit good electrocatalytic performance with a small overpotential of 165 mV (0.5 M H2SO4) and 124 mV (1 M KOH) at 10 mA cm-2, as well as a Tafel slope of 58 mV dec-1 (0.5 M H2SO4) and 59 mV dec-1 (1 M KOH). The excellent catalytic activity is ascribed to the nano crystallites and porous structure. What’s more, the belt structure also facilitates the charge transport in the materials during the electrocatalytic HER process. Therefore, the two-step strategy provides a new insight into the structural design with superior performance for electrocatalytic HER.


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