scholarly journals The Investigation of Reducing PAHs Emission from Coal Pyrolysis by Gaseous Catalytic Cracking

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Yulong Wang ◽  
Ruifang Zhao ◽  
Chun Zhang ◽  
Guanlong Li ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Cracking ◽  
Catalytic Effect ◽  
Catalyst Particle ◽  
Particle Sizes ◽  
Coal Pyrolysis ◽  
Gaseous Products ◽  
Cracking Process

The catalytic cracking method of PAHs for the pyrolysis gaseous products is proposed to control their pollution to the environment. In this study, the Py-GC-MS is used to investigate in situ the catalytic effect of CaO and Fe2O3on the 16 PAHs from Pingshuo coal pyrolysis under different catalytic temperatures and catalyst particle sizes. The results demonstrate that Fe2O3is effective than that of CaO for catalytic cracking of 16 PAHs and that their catalytic temperature corresponding to the maximum PAHs cracking rates is different. The PAHs cracking rate is up to 60.59% for Fe2O3at 600°C and is 52.88% at 700°C for CaO. The catalytic temperature and particle size of the catalysts have a significant effect on PAHs cracking rate and CaO will lose the capability of decreasing 16 PAHs when the temperature is higher than 900°C. The possible cracking process of 16 PAHs is deduced by elaborately analyzing the cracking effect of the two catalysts on 16 different species of PAHs.

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al 2 O 3 Catalysts

2020 ◽  
Vol 5 (16) ◽  
pp. 4905-4912 ◽  
Author(s):  
Siqian Cao ◽  
Dechao Wang ◽  
Mingyi Wang ◽  
Jialong Zhu ◽  
Lijun Jin ◽  
...  
Keyword(s):  
Catalytic Cracking ◽  
Coal Pyrolysis ◽  
Pyrolysis Tar

scholarly journals Effect of Particle Size on the HDS Activity of Molybdenum Sulfide

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Carola Contreras ◽  
Fernanda Isquierdo ◽  
Pedro Pereira-Almao ◽  
Carlos E. Scott
Keyword(s):  
Particle Size ◽  
Heavy Oil ◽  
Molybdenum Sulfide ◽  
Vacuum Gas Oil ◽  
Particle Sizes ◽  
Heavy Oils ◽  
Gas Oil ◽  
Oil Reserves ◽  
Effect Of Particle Size

More than half of the total world oil reserves are heavy oil, extra heavy oil, and bitumen; however their catalytic conversion to more valuable products is challenging. The use of submicronic particles or nanoparticles of catalysts suspended in the feedstock may be a viable alternative to the conversion of heavy oils at refinery level or downhole (in situ upgrading). In the present work, molybdenum sulfide (MoS2) particles with varying diameters (10000–10 nm) were prepared using polyvinylpyrrolidone as capping agent. The prepared particles were characterized by DLS, TEM, XRD, and XPS and tested in the hydrodesulfurization (HDS) of a vacuum gas oil (VGO). A correlation between particle size and activity is presented. It was found that particles with diameters around 13 nm show double the HDS activity compared with the material with micrometric particle sizes (diameter ≈ 10,000 nm).

An Experimental Study on the Effects of Abrasive Particle Sizes on Polishing Phenomena

2006 ◽  
Vol 505-507 ◽  
pp. 301-306
Author(s):  
Yeau Ren Jeng ◽  
Pay Yau Huang
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Theoretical Model ◽  
Test Bench ◽  
Abrasive Particle ◽  
Theoretical Data ◽  
Measurement Technology ◽  
Particle Sizes ◽  
Polishing Process

The effects of abrasive particle size on polishing phenomena during wafer planarization are investigated using a high precision polishing process test bench with in-situ measurement technology. The present experimental results are found to be comported with the experimental and theoretical data published previously. The current experimental outcomes can help to understand the polishing mechanism and develop the relating theoretical model.

Study on in Situ Sulfur Removal from Gasoline in Fluid Catalytic Cracking Process

2012 ◽  
Vol 26 (6) ◽  
pp. 3201-3211 ◽  
Author(s):  
Yaoshun Wen ◽  
Gang Wang ◽  
Chunming Xu ◽  
Jinsen Gao
Keyword(s):  
Catalytic Cracking ◽  
Sulfur Removal ◽  
Fluid Catalytic Cracking ◽  
Cracking Process

scholarly journals Upgrading Crude Biodiesel dari Minyak Goreng Bekas menggunakan Katalis H-Zeolit

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Isalmi Aziz ◽  
Muhammad Akbar Tafdila ◽  
Siti Nurbayti ◽  
Lisa Adhani ◽  
Wahyu Permata
Keyword(s):  
Particle Size ◽  
Reaction Temperature ◽  
Octane Number ◽  
Catalytic Cracking ◽  
Catalyst Concentration ◽  
Catalyst Particle ◽  
Gasoline Fraction ◽  
Optimum Conditions ◽  
Used Cooking Oil ◽  
Catalyst Particle Size

Crude biodiesel hasil transesterifikasi minyak goreng bekas dapat ditingkatkan kualitasnya melalui proses catalytic cracking menggunakan zeolit alam. Penelitian ini bertujuan untuk menentukan kondisi optimum proses catalytic cracking dan sifat fisika dan kimia biofuel yang dihasilkan. Reaksi dijalankan dalam reaktor dengan memvariasikan waktu (1, 2 dan 3 jam), konsentrasi katalis (3, 5 dan 7 %), ukuran partikel katalis (180, 250 dan 630μm) dan suhu reaksi (325, 350 dan 375°C). Kondisi optimum proses catalytic cracking crude biodiesel didapatkan pada : waktu  3 jam, konsentrasi katalis 7%, ukuran partikel katalis 180 μm dan suhu reaksi 375°C. Biofuel yang dihasilkan mengandung 6,26% fraksi bensin(C5-C11); 17,6% kerosin (C12-C15), 47,73% biodiesel (C16-C20) dan asam lemak 28,4%. Analisis sifat fisik menunjukan densitas 0,9631g/mL, titik tuang 12°C, titik nyala  49°C dan angka oktan 72,6. Kata kunci: catalytic cracking, crude biodiesel, angka oktan, biofuel. Crude biodiesel from transesterification of used cooking oil can be improved in quality through catalytic cracking using natural zeolite. This study aims to determine the optimum conditions for catalytic cracking and the physical and chemical properties of biofuels produced. The reaction was carried out in the reactor by varying the time (1, 2 and 3 hours), catalyst concentration (3, 5 and 7%), catalyst particle size (180, 250 and 630 μm) and reaction temperature (325, 350 and 375°C) . The optimum conditions for the catalytic cracking crude biodiesel process were obtained at: 3 hours, 7% catalyst concentration, catalyst particle size 180 μm and reaction temperature 375 ° C. The resulting biofuel contains 6.26% gasoline fraction (C5-C11); 17.6% kerosene (C12-C15), 47.73% biodiesel (C16-C20) and fatty acids 28.4%. Physical properties analysis showed density of 0.9631g/mL, pour point 12°C, flash point 49°C and octane number 72.6. Keywords: Catalytic cracking, crude biodiesel, octane number, biofuel. 

Transformation of paraffin and olefin hydrocarbons on the modified on the zeolite-containing cracking catalyst

2020 ◽  
Vol 20 (1) ◽  
pp. 61-66
Author(s):  
A. A. Kasimov ◽  
Kh. B. Pirieva ◽  
S. A. Jamalova ◽  
S. M. Hajizade ◽  
Z. R. Ismailova ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Cracking ◽  
Catalyst Particle ◽  
Catalyst Particle Size ◽  
Liquid Products ◽  
Cracking Gases ◽  
High Octane

As a catalyst for studying the conversion of hydrocarbons contained in catalytic cracking gases, a modified Ni, Co, Cr industrial OMNIKAT-210P zeolite-containing catalyst was used. The purpose of the research is to obtain a high-octane component of gasoline. The deposition of metals was carried out on nano-sized particles of a zeolite-containing catalyst. Particle size was at the level of (5÷10)·10–9 m. The particle size allows you to evenly apply the metals Ni, Cr, Co on the surface of the nanoparticles. Then the particles are molded in the form of balls with a size of 2–3 mm and subjected to drying (120 °С) and calcining 450–500 °С. The yield of liquid products is at the level of 48.3–30.3 % of the mass.

Particle Size Effect on the Corona Resistant Properties of PI/TiO2 Composite Films

2014 ◽  
Vol 981 ◽  
pp. 914-917
Author(s):  
Guang You Li ◽  
Jing Hua Yin ◽  
Lei Yao ◽  
Xing Zhao
Keyword(s):  
Particle Size ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Particle Size Effect ◽  
Interface Layer ◽  
Nanocomposite Films ◽  
Particle Sizes ◽  
Small Particles ◽  
The Matrix

Polyimide-based (PI) nanocomposites possess excellent electrical and thermal performance, widely used in inverter motor. In the paper using different particle sizes made polyimide/titania (PI/TiO2) nanocomposite films in situ polymerization, including 20nm A series and 50nm B series. The results shows that A series have a larger specific surface, combination of the film and matrix is closer without affecting the imidization of PI, and there is a clear interface layer and the structure is more stable. According to the time of corona-resistant A Series films is significantly longer than B Series films, especially the A series films with 15% of which corona-resistant time is 15h, five times than the pure PI. By both SAXS and XRD particle size in the matrix can be calculated, proving small particles can be better combination of the matrix of PI, increasing the number of traps, more effectively cutting off charge corrosion and making corona resistance greater performance.

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