Amorphous TiO2 and SiO2 Modified Alumina as Catalyst Support for Hydroprocessing of Maya Crude Oil Heavy Fractions

1998 ◽  
Vol 549 ◽  
Author(s):  
E. Lopez-Salinas ◽  
T. Itoh ◽  
E. Morales ◽  
S. Rivera ◽  
B. Medellin ◽  
...  
Keyword(s):  
Pore Size ◽  
Catalyst Support ◽  
Catalyst Supports ◽  
Commercial Catalyst ◽  
Commercial Alumina ◽  
Amorphous Tio2 ◽  
Heavy Fractions ◽  
Ph Swing ◽  
Vacuum Distillation Residue ◽  
Volume Decrease

AbstractA series of aluminas modified with 3-15 wt% S102 (AMASAs) and 2-9 wt% TiO2 (AMATAs) were prepared by a deposition and/or coprecipitation methods. The pore size distribution was varied by means of a pH-swing procedure where alternating pH acid-alkaline values generated 100-200 Å pores, particularly in the AMASAs case. However, the incorporation of TiO 2 in the AMATAs even after the pH-swing procedure results in a pore size and volume decrease- The degree of TiO 2 reduction is much higher in AMATAs obtained by deposition than those obtained by coprecipitation. The use of AMASAs as catalyst supports of 2.4 wt% Ni and 8.8 wt% Mo in the hydroconversion of a vacuum distillation residue brings about 1.5 times higher conversion to lighter fractions in comparison with a commercial alumina-based catalyst. AMATA-based catalyst shows similar activity and selectivity to the commercial catalyst. However, the presence of TiO2 (6 wt%) considerably increases the N and V removal, and decreases the formation of sediments.

scholarly journals Investigation of Salt and precipitating agent effect on the specific surface area and compressive strength of alumina catalyst support

2017 ◽  
Vol 19 (3) ◽  
pp. 35-40 ◽  
Author(s):  
Mostafa Mahmoudian ◽  
Alireza Hemmati ◽  
Hasan Hashemabadi ◽  
Ahad Ghaemi ◽  
Shahrokh Shahhosseini
Keyword(s):  
Compressive Strength ◽  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sol Gel ◽  
Catalyst Support ◽  
Catalyst Supports ◽  
Chloride Salt ◽  
Alumina Catalyst

Abstract Nowadays, catalyst supports are extensively used to decrease the costs and increase the contact surface area in chemical reactions. Specific surface area, compressive strength, pore volume and pore size are some of the most important characteristics of a catalyst support. In this work, Sol-gel and peptization methods were applied to produce alumina catalyst support. Also the roles of aluminum salts and precipitating agents on the specific surface area and compressive strength of alumina catalyst support were investigated. In addition, various additives and common methods in the increasing surface area, compressive strength and adjusting the porosity and pore size are used in this study. The results show that using caustic soda as precipitating agent and aluminum chloride salt yields catalyst supports with the best compressive strength. Also, using aluminum nitrate and ammonia as precipitating agent produced alumina catalyst support with the highest specific surface area.

scholarly journals Impact of bitumen composition on empirical properties

2018 ◽  
Vol 196 ◽  
pp. 04038
Author(s):  
Eva Remišová ◽  
Michal Holý
Keyword(s):  
Crude Oil ◽  
Sulfur Content ◽  
Vacuum Distillation ◽  
Petroleum Products ◽  
The Other ◽  
Distillation Residue ◽  
Heavy Fractions ◽  
Further Development ◽  
Vacuum Distillation Residue

In recent years, there has been a further development of refining technology, which make it possible to better use of crude oil, which also has a major impact on the quality of bitumen. Most European refineries, of course, are processing, for reasons of the resale of petroleum products, especially petroleums suitable for the recovery of light and middle fractions. Therefore, light petroleums are required, with low yields of heavy fractions, which are highly economically and in dispositions efficient for processors on the petroleum market. Emphasis is placed on the sulfur content, the paraffin content is no longer the most important aspect. Less important from the perspective of the refinery is the content and the ratio of asphaltenes and maltenes. There is no doubt that we will have to change our view on petroleum products. Their availability will continue to decline, their price, on the other hand, is likely to grow in relation to falling supplies of resources. Therefore, the view of the bitumen must be changed. The most common way of production of PG bitumen is vacuum distillation, which is carried out in such a way that the vacuum distillation residue satisfies it´s properties bitumen requirements for the relevant penetration.

The control of pore size in alumina catalyst supports: A review

1986 ◽  
Vol 21 (2) ◽  
pp. 215-238 ◽  
Author(s):  
D.L. Trimm ◽  
A. Stanislaus
Keyword(s):  
Pore Size ◽  
Catalyst Supports ◽  
Alumina Catalyst

scholarly journals Highly porous hydroxyapatite derived from cuttlefish bone as tio2 catalyst support

2018 ◽  
Vol 12 (2) ◽  
pp. 136-142 ◽  
Author(s):  
Dajana Milovac ◽  
Ivna Weigand ◽  
Marin Kovacic ◽  
Marica Ivankovic ◽  
Hrvoje Ivankovic
Keyword(s):  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Catalyst Support ◽  
Vacuum Impregnation ◽  
Porous Hydroxyapatite ◽  
Tio2 Catalyst ◽  
Bet Method ◽  
Highly Porous

Highly porous hydroxyapatite (Ca10(PO4)6(OH)2, HAp) catalyst support was prepared through hydrothermal transformation of aragonitic cuttlefish bone (Sepia Officinalis, L., Adriatic Sea) at 200?C, preserving the natural well interconnected porous structure. To deposit the TiO2 catalyst on the pore walls of the HAp support two methods were used: i) vacuum impregnation of the support with the suspension of a commercial TiO2 nanopowder in isopropanol and ii) in situ synthesis of TiO2 on the support by sol-gel technique. XRD analysis and FTIR spectroscopy were used to determine the phase composition of the material. The morphology and microstructure of the composite samples were studied by scanning electron microscopy (SEM). The presence of TiO2 particles on the HAp surface was determined by SEM/EDX analysis. To determine the specific surface area and pore size, Brunauer-Emmett-Teller (BET) method was used. The results of the BET method showed the increased specific surface area and pore size reduction after impregnation of TiO2 into the HAp carrier. The photocatalytic activity of HAp/TiO2 samples was studied in a batch reactor with an annular UV-A lamp using salicylic acid as a model water pollutant. The results indicated the suitability of prepared HAp supported TiO2 catalysts for photocatalytic applications.

Comparative Studies of Cellular Permeable Solids as Catalyst Supports

2008 ◽  
Vol 135 ◽  
pp. 150-153
Author(s):  
Oleg Smorygo ◽  
A. Leonov ◽  
Z.R. Ismagilov ◽  
Chang Kyu Rhee
Keyword(s):  
Pore Structure ◽  
Comparative Studies ◽  
Catalyst Support ◽  
Ceramic Foam ◽  
Operational Performance ◽  
Catalyst Supports ◽  
Straight Channel ◽  
Foam Structure

Metallic and ceramic foam catalyst supports and catalysts were manufactured. Comparative studies of the foam-structure catalyst supports and straight-channel catalysts supports were performed. Affect of the catalyst support pore structure upon the catalyst operational performance was analyzed.

Solid - Phase Synthesis of Carbon Nanoparticles and their Application to Direct Methanol Fuel Cell

2007 ◽  
Vol 539-543 ◽  
pp. 1356-1360
Author(s):  
Jing Mei Shen ◽  
Gui Qin Lv ◽  
Ning Zhang ◽  
Sheng Sheng Zhang ◽  
Xiao Hong Kang ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
Direct Methanol Fuel Cell ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Catalyst Support ◽  
Catalyst Supports ◽  
Simple Method ◽  
Phase Synthesis ◽  
Direct Methanol ◽  
Methanol Fuel Cell

Carbon nanoparticles were prepared by simple method. TEM image shows that the particle size is several nanometers. Furthermore, the specific surface area of the material is reached for 425.8 m2/g. It is much larger than that of carbonVulcan-XC72, which they is widely used as catalyst supports for DMFC electrodes. Carbon nanoparticles is a kind of promising material used for catalyst support in DMFC.

Electron Microscopy of Porous Materials—The Structure of a Commercial Alumina Catalyst Support

1971 ◽  
Vol 29 ◽  
pp. 154-155
Author(s):  
D. Faulkner ◽  
N. H. Sagert ◽  
E. E. Sexton ◽  
R. C. Styles
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Catalyst Support ◽  
Chemical Properties ◽  
Carbon Substrate ◽  
High Porosity ◽  
Transmission Electron Micrograph ◽  
Electron Micrograph ◽  
Direct Technique

Many practical catalysts consist of a metal supported on a stable material. The activity of such a system depends not only on the chemical properties of the metal and support, but also on certain physical properties of the support such as surface area, pore volume and pore size distribution. Indirect information on the pore structure of the support material can be obtained from low-temperature nitrogen adsorption experiments, but a more direct technique for obtaining this information is to examine the material in the electron microscope.The material chosen for this study was a high porosity alumina obtained from Englehard. The pore size distribution as supplied by the manufacturer indicated 0.24 cc of pores/g in the range 0-100Å, and 0.16 cc/g > 100Å. Figure 1 is a scanning electron micrograph of the surface of the material. Although no great detail can be resolved, the surface is obviously uneven, and gives the impression of being somewhat fibrous in texture. Figure 2 is a transmission electron micrograph of the same material. This sample was prepared by crushing the material and dispersing the particles on a carbon substrate.

A Study on SCR Catalyst Support

2013 ◽  
Vol 726-731 ◽  
pp. 17-20 ◽  
Author(s):  
Ruo Han Li ◽  
Song Zhou ◽  
Cai Ling Li ◽  
Zhi Yu Wang ◽  
Yuan Qing Zhu
Keyword(s):  
Activated Carbon ◽  
Flue Gas ◽  
Supported Catalysts ◽  
Active Material ◽  
Catalyst Support ◽  
Activated Carbon Fiber ◽  
Catalyst Supports ◽  
Scr Catalyst ◽  
Activity Test ◽  
Scr System

NOx is one of the most serious atmosphere pollutants, and how to control and remove NOx is the hot research in the environmental field all over the world. SCR is considered as one of the most effective denitration methods at present. In SCR technology, catalyst is the core of the SCR system, and the performance of SCR catalyst mainly depends on the active component and catalyst support. Catalyst support can not only affect the choice of the active material and the catalyst promoter, but also affect the flue gas denitration efficiency. This paper mainly introduces four kinds of SCR catalyst supports: TiO2, Al2O3, activated carbon and activated carbon fiber and ZSM-5 zeolite. The performance of the four types of catalyst supports are compared, and SCR activity test of Mn-Ce supported and V2O5 supported on different catalyst supports are conducted respectively. Finally, for Mn-Ce supported and V2O5 supported catalysts, this paper puts forward that TiO2 is the most widely used and effective catalyst support.

scholarly journals Co/SBA-15 modified with TMB in the degradation of phenol

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
H. Pérez Vidal ◽  
M. A. Lunagómez ◽  
J.G. Pacheco ◽  
J.G. Torres Torres ◽  
D. De la Cruz Romero ◽  
...  
Keyword(s):  
Pore Size ◽  
Mesoporous Material ◽  
Catalyst Support ◽  
Physicochemical Characterization ◽  
Specific Area ◽  
Hexagonal Structure ◽  
Ordered Mesoporous ◽  
Typical Morphology ◽  
Ordered Mesoporous Material ◽  
High Specific Area

Mesoporous materials like SBA-15 offer excellent properties such as catalyst support adsorbent due to its textural characteristics and their surface chemistry. The main objective of this study was to support cobalt (20 % w) in the type ordered mesoporous material SBA-15 and expand the pore size with the introduction of a "blowing agent", such as 1,3,5-trimethylbenzene (TMB), to be evaluated in the degradation of phenol. By its physicochemical characterization, it was confirmed that this is an ordered mesoporous material with two-dimensional hexagonal structure (p6mm) with high specific area, narrow pore distribution and typical morphology of this material. The pore size of SBA-15 has been extended to 19 nm by the addition of cosolvent organic molecules (TMB) and the particle size of cobalt decreased from 18.8 nm in SBA-15 to 6.4 nm on average by supporting it in SBA-15 modified with TMB; this property seems to confer the material be more selective in the conversion of CO2, which is the reason why it has greater activity for the degradation of phenol.

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