Intermediate-crystallization promoted catalytic activity of titanosilicate zeolites

2018 ◽  
Vol 6 (18) ◽  
pp. 8757-8762 ◽  
Author(s):  
Risheng Bai ◽  
Qiming Sun ◽  
Yue Song ◽  
Ning Wang ◽  
Tianjun Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxidative Desulfurization ◽  
Zeolite Catalysts ◽  
Crystallization Time ◽  
Seeding Method

Crystallization time-modulated catalytic activity for oxidative desulfurization has been demonstrated over titanosilicate zeolite catalysts prepared by a seeding method.

The effect of crystallization time on structure, microstructure, and catalytic activity of zeolite-A synthesized from rice husk silica and food-grade aluminum foil

2021 ◽  
Vol 148 ◽  
pp. 106050
Author(s):  
Wasinton Simanjuntak ◽  
Kamisah D. Pandiangan ◽  
Zipora Sembiring ◽  
Agustina Simanjuntak ◽  
Sutopo Hadi
Keyword(s):  
Catalytic Activity ◽  
Rice Husk ◽  
Aluminum Foil ◽  
Crystallization Time ◽  
Zeolite A ◽  
Food Grade ◽  
Rice Husk Silica

The catalytic activity of microporous and mesoporous NiCoBeta zeolite catalysts in Fischer–Tropsch synthesis

2021 ◽  
Vol 47 (1) ◽  
pp. 397-418
Author(s):  
Karolina A. Chalupka ◽  
Renata Sadek ◽  
Lukasz Szkudlarek ◽  
Pawel Mierczynski ◽  
Waldemar Maniukiewicz ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Tropsch Synthesis ◽  
Zeolite Catalysts ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals A diffusion anisotropy descriptor links morphology effects of H-ZSM-5 zeolites to their catalytic cracking performance

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Xiaoliang Liu ◽  
Jing Shi ◽  
Guang Yang ◽  
Jian Zhou ◽  
Chuanming Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Cracking ◽  
Catalytic Performance ◽  
Zeolite Catalysts ◽  
Time Resolved ◽  
Cracking Performance ◽  
Morphology Effect ◽  
Ft Ir ◽  
The Difference ◽  
Dynamics Simulations

AbstractZeolite morphology is crucial in determining their catalytic activity, selectivity and stability, but quantitative descriptors of such a morphology effect are challenging to define. Here we introduce a descriptor that accounts for the morphology effect in the catalytic performances of H-ZSM-5 zeolite for C4 olefin catalytic cracking. A series of H-ZSM-5 zeolites with similar sheet-like morphology but different c-axis lengths were synthesized. We found that the catalytic activity and stability is improved in samples with longer c-axis. Combining time-resolved in-situ FT-IR spectroscopy with molecular dynamics simulations, we show that the difference in catalytic performance can be attributed to the anisotropy of the intracrystalline diffusive propensity of the olefins in different channels. Our descriptor offers mechanistic insight for the design of highly effective zeolite catalysts for olefin cracking.

Effect of Preparation Methods of HPW/SiO2 Mesoporous Composites on its Catalytic Performance in Fuel Oils Desulfurization

2010 ◽  
Vol 148-149 ◽  
pp. 924-928
Author(s):  
Xue Min Yan ◽  
Yuan Zhu Mi
Keyword(s):  
Catalytic Activity ◽  
Self Assembly ◽  
Electrostatic Force ◽  
Oxidative Desulfurization ◽  
Strong Acid ◽  
Catalytic Performance ◽  
Synthesis Mechanism ◽  
Base Interaction ◽  
Preparation Methods ◽  
Oh Groups

Two kinds of mesoporous HPW/SiO2 composites, which have been synthesized respectively by the amino-functionalized (AF) method and evaporation-induced self-assembly (EISA) method, have been used as catalysts in the oxidative desulfurization process of dibenzothiophene(DBT). The catalytic performance results show that the catalyst synthesized by EISA method holds higher catalytic activity than that synthesized by the AF method. The difference of catalytic activity can be attributed to the different synthesis mechanism of two kinds of composites. In the AF method, the bonding force between HPW and SiO2 is strong acid-base interaction, which damages the Keggin structure. Whereas in the EISA process, electrostatic force and hydrogen bonds between W=O groups and Si-OH groups are main bonding forces. The hydrogen bond holds the electron-withdrawing effect, which increases the activity of nonbonding W=O groups in HPW and then results in the enhancement of the catalytic activity.

scholarly journals Understanding the Catalytic Activity of Microporous and Mesoporous Zeolites in Cracking by Experiments and Simulations

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1114
Author(s):  
Shih-Cheng Li ◽  
Yen-Chun Lin ◽  
Yi-Pei Li
Keyword(s):  
Catalytic Activity ◽  
Active Site ◽  
Petrochemical Industry ◽  
Molecular Level ◽  
Shape Selectivity ◽  
Zeolite Catalysts ◽  
Hydrocarbon Cracking ◽  
Mesoporous Zeolites ◽  
Secondary Reactions ◽  
Pros And Cons

Porous zeolite catalysts have been widely used in the industry for the conversion of fuel-range molecules for decades. They have the advantages of higher surface area, better hydrothermal stability, and superior shape selectivity, which make them ideal catalysts for hydrocarbon cracking in the petrochemical industry. However, the catalytic activity and selectivity of zeolites for hydrocarbon cracking are significantly affected by the zeolite topology and composition. The aim of this review is to survey recent investigations on hydrocarbon cracking and secondary reactions in micro- and mesoporous zeolites, with the emphasis on the studies of the effects of different porous environments and active site structures on alkane adsorption and activation at the molecular level. The pros and cons of different computational methods used for zeolite simulations are also discussed in this review.

Deep Oxidative Desulfurization of Dibenzothiophene by Functional Tungsten-Containing Mesoporoussilica from Polyoxometalate-Based Salts

2014 ◽  
Vol 636 ◽  
pp. 93-96
Author(s):  
Ming Zhang ◽  
Wen Shuai Zhu ◽  
Meng Li ◽  
Yan An Li ◽  
Suhang Xun ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Organic Solvents ◽  
Room Temperature ◽  
Oxidative Desulfurization ◽  
Catalytic Performance ◽  
Sulfur Compounds ◽  
High Dispersion ◽  
One Pot ◽  
Tungsten Species

Tungsten-containing functional mesoporousW-SiO2 have been successfully synthesized by an one-pot and facile room-temperature procedure. These materials presented a high dispersion of tungsten species and excellent catalytic activity on the removal of sulfur compounds without any organic solvents as extractants. The catalytic performance on sulfur compounds was investigated in detail. After recycling for 8 times, the removal of the oxidation desulfurization system could still reach 92.0%.

Insights into the catalytic activity of Ru/NaY catalysts for efficient H2 production through aqueous phase reforming

2020 ◽  
Vol 4 (2) ◽  
pp. 678-690 ◽  
Author(s):  
Pranjal Gogoi ◽  
Atul S. Nagpure ◽  
Prabu Kandasamy ◽  
C. V. V. Satyanarayana ◽  
Thirumalaiswamy Raja
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Aqueous Phase ◽  
H2 Production ◽  
Zeolite Catalysts ◽  
Nay Zeolite ◽  
Ruthenium Nanoparticles ◽  
Exchange Method ◽  
Aqueous Phase Reforming ◽  
Ion Exchange Method

Ruthenium nanoparticles supported on NaY zeolite catalysts were synthesized by a simple ion exchange method.

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