Preparation of hierarchical structure of Y zeolite with ultrasonic-assisted alkaline treatment method used in catalytic cracking of middle distillate cut: The effect of irradiation time

2018 ◽  
Vol 176 ◽  
pp. 283-295 ◽  
Author(s):  
Shima Oruji ◽  
Reza Khoshbin ◽  
Ramin Karimzadeh
Keyword(s):  
Hierarchical Structure ◽  
Catalytic Cracking ◽  
Irradiation Time ◽  
Treatment Method ◽  
Alkaline Treatment ◽  
Y Zeolite ◽  
Middle Distillate ◽  
Ultrasonic Assisted

scholarly journals Lignin and Cellulose Extraction from Vietnam’s Rice Straw Using Ultrasound-Assisted Alkaline Treatment Method

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Ngo Dinh Vu ◽  
Hang Thi Tran ◽  
Nhi Dinh Bui ◽  
Cuong Duc Vu ◽  
Hung Viet Nguyen
Keyword(s):  
Rice Straw ◽  
Ultrasonic Irradiation ◽  
Extraction Method ◽  
Treatment Method ◽  
Alkaline Treatment ◽  
Lignin Extraction ◽  
Ultrasonic Assisted ◽  
Ft Ir ◽  
Ultrasound Assisted ◽  
Modern Analytical

The process of cellulose and lignin extraction from Vietnam’s rice straw without paraffin pretreatment was proposed to improve economic efficiency and reduce environmental pollution. Treatment of the rice straw with ultrasonic irradiation for 30 min increased yields of lignin separation from 72.8% to 84.7%. In addition, the extraction time was reduced from 2.5 h to 1.5 h when combined with ultrasonic irradiation for the same extraction yields. Results from modern analytical methods of FT-IR, SEM, EDX, TG-DTA, and GC-MS indicated that lignin obtained by ultrasound-assisted alkaline treatment method had a high purity and showed a higher molecular weight than that of lignin extracted from rice straw without ultrasonic irradiation. The lignin and cellulose which were extracted from rice straw showed higher thermal stability with 5% degradation at a temperature of over 230°C. The ultrasonic-assisted alkaline extraction method was recommended for lignin and cellulose extraction from Vietnam’s rice straw.

An analytical microscopic study of metals in fluidized catalytic cracking catalyst

1986 ◽  
Vol 44 ◽  
pp. 854-855
Author(s):  
Clifford S. Rainey
Keyword(s):  
Electron Microscopy ◽  
Spatial Distribution ◽  
Catalytic Cracking ◽  
Catalyst Deactivation ◽  
Coke Formation ◽  
Acid Sites ◽  
Y Zeolite ◽  
Fcc Catalyst ◽  
Fluidized Catalytic Cracking ◽  
High Regeneration

The spatial distribution of V and Ni deposited within fluidized catalytic cracking (FCC) catalyst is studied because these metals contribute to catalyst deactivation. Y zeolite in FCC microspheres are high SiO2 aluminosilicates with molecular-sized channels that contain a mixture of lanthanoids. They must withstand high regeneration temperatures and retain acid sites needed for cracking of hydrocarbons, a process essential for efficient gasoline production. Zeolite in combination with V to form vanadates, or less diffusion in the channels due to coke formation, may deactivate catalyst. Other factors such as metal "skins", microsphere sintering, and attrition may also be involved. SEM of FCC fracture surfaces, AEM of Y zeolite, and electron microscopy of this work are developed to better understand and minimize catalyst deactivation.

scholarly journals Green and Efficient PEG-Based Ultrasonic-Assisted Extraction of Polysaccharides from Tree Peony Pods and the Evaluation of Their Antioxidant Activity In Vitro

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaonan Zhang ◽  
Qingfeng Ban ◽  
Xibo Wang ◽  
Zhongjiang Wang
Keyword(s):  
Galacturonic Acid ◽  
Antioxidant Activities ◽  
Irradiation Time ◽  
Ultrasound Irradiation ◽  
Molar Ratio ◽  
Precolumn Derivatization ◽  
Tree Peony ◽  
Assisted Extraction ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction

We adopted and developed an ultrasonic-assisted extraction method to obtain polysaccharides from tree peony pods using polyethylene glycol (PEG) as the solvent. The technological parameters have been designed as a single factor to enhance the tree peony pod polysaccharide extraction yield. Specific conditions (ultrasound irradiation power, 250 W; ultrasound irradiation time, 30 min; reaction temperature 50°C; liquid-solid ratio, 25 mL/g; and concentration of PEG, 0.2 g/mL) generated an experimental yield of 14.14%  ± 0.44%. Subsequently, the monosaccharide composition of the tree peony pod polysaccharides was determined by HPLC using a 1-phenyl-3-methyl-5-pyrazolone precolumn derivatization method. The results indicated that tree peony pod polysaccharides contained mannoses, rhamnose, glucuronic acid, galacturonic acid, glucose, galactose, arabinose, and fucose with a molar ratio of 1.44 : 2.87 : 0.32 : 18.99 : 3.99 : 10.21 : 0.96 : 1.85 : 0.21. The tree peony pod polysaccharides obtained are mainly galacturonic acid and galactose, which are acidic polysaccharides. Finally, the antioxidant activities (DPPH and FRAP) of the tree peony pod polysaccharides were assessed, and the compounds exhibited moderate antioxidant activities.

A new composite consisting of Y zeolite and ZrO2 for fluid catalytic cracking reaction

2020 ◽  
Vol 200 ◽  
pp. 108317
Author(s):  
Wanrong Liu ◽  
Xinmei Liu ◽  
Yu Gu ◽  
Yuxiang Liu ◽  
Zhumo Yu ◽  
...  
Keyword(s):  
Catalytic Cracking ◽  
Fluid Catalytic Cracking ◽  
Y Zeolite ◽  
Cracking Reaction ◽  
Catalytic Cracking Reaction

Preparation and Properties of Granular Cold-Water-Soluble Maize Starch by Ultrasonic-Assisted Alcoholic-Alkaline Treatment

2018 ◽  
Vol 70 (11-12) ◽  
pp. 1700354 ◽  
Author(s):  
Yali Yu ◽  
Yao Wang ◽  
Ying Wang ◽  
Dingbo Lin ◽  
Xinxin Li ◽  
...  
Keyword(s):  
Cold Water ◽  
Alkaline Treatment ◽  
Water Soluble ◽  
Maize Starch ◽  
Ultrasonic Assisted

Preparation of Y Zeolite-Based Catalysts and their Catalytic Cracking Performances of Venezuelan Heavy Oil

2012 ◽  
Vol 608-609 ◽  
pp. 1407-1412
Author(s):  
Peng Hui Zeng ◽  
Bao Jian Shen ◽  
Sheng Fu Ji ◽  
Yun Liang ◽  
Xiang Hai Meng
Keyword(s):  
Pore Structure ◽  
Heavy Oil ◽  
Catalytic Cracking ◽  
Product Distribution ◽  
Pore Distribution ◽  
Oil Yield ◽  
Y Zeolite ◽  
Acidic Properties ◽  
Cracking Performance ◽  
Adsorption Desorption

Five kinds of modified Y zeolite-based fluid catalytic cracking (FCC) catalysts were prepared. The N2 adsorption desorption and NH3 temperature-programmed-desorption (NH3-TPD) were used to investigate the pore structure and acidic properties of the catalysts. The effects of pore structure and acidic properties of catalysts on the catalytic cracking performance of Venezuelan heavy oil were carried out using an advanced cracking evaluation unit. The results of N2 adsorption desorption and NH3-TPD show that CAT-A and CAT-B catalysts with rundle pore distribution have a similar pore sizes and acidSubscript textSubscript textic properties. The catalytic cracking results show that the acidic properties and the pore distribution of the catalysts have obvious effects on the conversion and product distribution. The light oil yield and total liquid oil yield can reach 58.75wt% and 73.83 wt%, respectively, under reaction temperature of 520°C.

Perlite templated Y zeolite assembly and its potential as an efficient catalytic cracking catalyst

2017 ◽  
Vol 243 ◽  
pp. 130-134 ◽  
Author(s):  
Wennian Wang ◽  
Shanshan Kong ◽  
Xiaoxiao Zhou ◽  
Delin Yuan ◽  
Hao Li ◽  
...  
Keyword(s):  
Catalytic Cracking ◽  
Y Zeolite
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