The production of alkane chains from methanol on HY zeolite studied by 13C n.m.r. techniques

1982 ◽  
pp. 1185 ◽  
Author(s):  
Takeshi Kotanigawa ◽  
Katsuyoshi Shimikawa ◽  
Tadashi Yoshida
Keyword(s):  
Hy Zeolite

scholarly journals Plastic waste to fuels by hydrocracking at mild conditions

2021 ◽  
Vol 7 (17) ◽  
pp. eabf8283
Author(s):  
Sibao Liu ◽  
Pavel A. Kots ◽  
Brandon C. Vance ◽  
Andrew Danielson ◽  
Dionisios G. Vlachos
Keyword(s):  
Direct Method ◽  
Acid Sites ◽  
Liquid Fuels ◽  
High Yield ◽  
Tandem Catalysis ◽  
Hy Zeolite ◽  
Environmental Threat ◽  
Single Use ◽  
Initial Activation ◽  
A Direct Method

Single-use plastics impose an enormous environmental threat, but their recycling, especially of polyolefins, has been proven challenging. We report a direct method to selectively convert polyolefins to branched, liquid fuels including diesel, jet, and gasoline-range hydrocarbons, with high yield up to 85% over Pt/WO3/ZrO2 and HY zeolite in hydrogen at temperatures as low as 225°C. The process proceeds via tandem catalysis with initial activation of the polymer primarily over Pt, with subsequent cracking over the acid sites of WO3/ZrO2 and HY zeolite, isomerization over WO3/ZrO2 sites, and hydrogenation of olefin intermediates over Pt. The process can be tuned to convert different common plastic wastes, including low- and high-density polyethylene, polypropylene, polystyrene, everyday polyethylene bottles and bags, and composite plastics to desirable fuels and light lubricants.

Effect of space velocity on the hydrocracking of Light Cycle Oil over a Pt–Pd/HY zeolite catalyst

2012 ◽  
Vol 95 ◽  
pp. 8-15 ◽  
Author(s):  
Alazne Gutiérrez ◽  
José M. Arandes ◽  
Pedro Castaño ◽  
Martin Olazar ◽  
Astrid Barona ◽  
...  
Keyword(s):  
Zeolite Catalyst ◽  
Space Velocity ◽  
Light Cycle ◽  
Hy Zeolite ◽  
Light Cycle Oil ◽  
Cycle Oil

Zeolite-catalyzed acylation of heterocyclic compounds — VI. One-step synthesis of 3-(benzofuran-2-carbonyl)pentane-2,4-dione from 2-acetylbenzofuran over HY-zeolite

Tetrahedron ◽  
1998 ◽  
Vol 54 (49) ◽  
pp. 14757-14766 ◽  
Author(s):  
F. Richard ◽  
H. Carreyre ◽  
J.M. Coustard ◽  
C. Bachmann ◽  
G. Perot
Keyword(s):  
Heterocyclic Compounds ◽  
Hy Zeolite ◽  
One Step

Effect of Dilution on 2-Methylpentane Cracking over HY Zeolite

1993 ◽  
Vol 142 (2) ◽  
pp. 499-511 ◽  
Author(s):  
Y.X. Zhao ◽  
B.W. Wojciechowski
Keyword(s):  
Hy Zeolite

scholarly journals Effects of feed properties in spray drying formulation of prototype industrial cracking catalysts

2021 ◽  
Vol 63 (6) ◽  
pp. 41-44
Author(s):  
Duc Hoan Truong ◽  
◽  
Thuy Phuong Ngo- ◽  
Duc Manh Dinh ◽  
Thanh Tung Dang ◽  
...  
Keyword(s):  
Particle Size ◽  
Surface Area ◽  
Spray Drying ◽  
Ph Value ◽  
Catalyst Particle ◽  
Active Phase ◽  
Solid Content ◽  
Medium Ph ◽  
Hy Zeolite ◽  
Cracking Catalysts

This paper studied the effects of feed properties in spray drying formulation of prototype industrial cracking catalysts at the laboratory scale. The results showed that the pH of the drying feed mainly affected the active phase HY zeolite. At a high pH value, a strongly alkaline medium (pH 14), the HY zeolite structure was completely destroyed, resulting in the cracking catalyst with a low surface area. Hence, the pH of the drying feed should be adjusted to a low value, preferably a slightly acidic medium (pH 3). The solid content mainly affected the particle size of the cracking catalyst. As increasing the solid content in the drying feed, the particle size of the cracking catalysts increased and reached the maximum average value at about 40 μm which corresponded to the solid content of 15 wt.%. At a higher solid content (20 wt.%), the catalyst particle size and surface area tended to decrease. Thus, the solid content of 15 wt.% was considered to be optimal.

scholarly journals Synthesis and Characterization of Functionalize HY Zeolite With Sulfunic Acid, A Micro-meso Structure as an Efficient Reusable Catalyst in Organic Transformations

2021 ◽  
Author(s):  
Mojgan Zendehdel ◽  
Fatemeh Tavakoli
Keyword(s):  
Reaction Times ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Organic Transformations ◽  
Hy Zeolite ◽  
New Class ◽  
Solvent Free Condition ◽  
Result Show ◽  
High Yields

Abstract A new class of catalyst has been prepared with sulfunic acid functionalized HY zeolite (HY-N-SO3H) and characterized by FESEM, TEM, FTIR, TGA, XRD and BET. The result show that the catalyst has the micro-meso structure without ordering in the mesophase. Then, two sets of organic reaction were examined to consider of catalytic activity. The micro-meso structure HY-N-SO3H was used as an acidic catalyst to synthesis of coumarins via Pechmann reaction and facile transformation of amines to formamides under solvent free condition. This catalyst was compared with NaY-N-SO3H and MCM-N-SO3H and pure porous material to consider of the effect of acidity and kind and size of porous in the catalyst. The significant advantages of HY-N-SO3H respect to other catalyst are short reaction times, high yields, pure products, mild conditions and easy workup. In addition, we report an original and environmentally friendly solvent-free procedures which reusability of catalyst makes this method nearly green and environmental friendly.

scholarly journals Stabilitas Zeolit HY Hidrofobik terhadap Uji Hot Liquid Water (HLW)

2021 ◽  
Vol 10 (2) ◽  
pp. 58-62
Author(s):  
Yuni Susanti ◽  
Yeni Variyana
Keyword(s):  
Liquid Water ◽  
Raw Materials ◽  
Sodium Aluminate ◽  
Zeolite Catalysts ◽  
Wave Number ◽  
Physical Test ◽  
Hy Zeolite ◽  
Ftir Spectrometer ◽  
Two Phases ◽  
The Stability

Initially, zeolite catalysts cannot be used for reactions involving hot liquid water, so it is necessary to modify the zeolite to be stable under these conditions. The synthesis of HY and hydrophobic zeolites aimed to determine the stability of zeolite in hot liquid water (HLW). The stability of zeolite in HLW is related to zeolite hydrophobicity. In this study, the main raw materials for the synthesis of HY zeolite were sodium aluminate (NaAlO2) and Ludox HS-40 by calcining the product at 350 oC for 1 hour. Furthermore, increasing the hydrophobicity of HY zeolite was carried out by modifying the external zeolite surface using organosilanes (aminopropyltriethoxysilane). The stability of two zeolites in HLW was set at 200 oC. Zeolite analysis used physical test and Fourier Transform-Infra Red (FTIR) Spectrometer. The results of the zeolite distribution in two phases confirmed that HY zeolite was completely dispersed in the water phase, while the zeolite one was dispersed in the organic phase. Moreover, the IR spectra of HY zeolite showed that the wide peak detection at wave number 720 cm-1 for beginning to disappear. This means that the HLW condition could be damaged to the d6r unit. Another result was shown by hydrophobic zeolite spectra with a stable peak for 72 hours. This indicates that the hydrophobic zeolite has thermal stability in HLW so that it can be used in chemical reaction catalytic applications that use on phase.

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