Modified Activated Carbon for Gas Phase Synthesis of Dimethyl Carbonate

2011 ◽  
Vol 142 ◽  
pp. 221-224 ◽  
Author(s):  
Rui Li
Keyword(s):  
Activated Carbon ◽  
Pore Size ◽  
Copper Catalyst ◽  
Catalyst Activity ◽  
Methanol Conversion ◽  
Active Components ◽  
Modified Activated Carbon ◽  
Catalyst Carrier ◽  
Space Time Yield ◽  
Increased Activity

Study of activated carbon (AC) activator modified type, bore temperature, the ratio of the response activity. Optimized modified conditions: activator of CuCl2, a temperature of 800 °C, the AC activator ratio of 1:1. AC carrier prepared by reaming modified copper catalyst activity than the non-reaming significantly increased activity in the evaluation of typical conditions, the methanol conversion rate of 34.6%, DMC selectivity was 96.4%, DMC space-time yield was 221.1g / (kgcat • h). CuCl2 activation of AC in the pore distribution of modified ratio of 98%, mainly between the 2 ~ 3nm. Pore ​​structure of the catalyst carrier has a significant effect on the activity, a larger proportion of the pore size distribution and pore size of about 2.5 nm in the AC carrier is conducive to the dispersion of active components and oxidative carbonylation catalytic activity increased.

Modified bamboo-based activated carbon as the catalyst carrier for the gas phase synthesis of vinyl acetate from acetylene and acetic acid

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiuling Guo ◽  
Jihai Duan ◽  
Chaojie Li ◽  
Zisheng Zhang ◽  
Weiwen Wang
Keyword(s):  
Acetic Acid ◽  
Activated Carbon ◽  
Thermal Treatment ◽  
Pore Size ◽  
Gas Phase ◽  
Vinyl Acetate ◽  
Active Components ◽  
Phase Synthesis ◽  
Catalyst Carrier ◽  
Gas Phase Synthesis

Abstract As a significant component of catalyst system, catalyst carrier can impact on coating amount of active component, and in turn catalytic activity. In this work, study of bamboo-based activated carbon as the catalyst carrier for gas phase synthesis of vinyl acetate from acetylene and acetic acid was carried out. Characterization and experimental results showed that bamboo-based activated carbon possessed the conditions and potential of being a catalyst carrier and characterized a greater advantage in structure and properties after modification. After ultrasonic treatment, it was found that the mesoporous distribution of activated carbon increased, which promoted the adsorption to zinc acetate and resulted in 23% increase in productivity of catalyst. Simultaneously, it had a different effect on surface area and pore-size distribution of activated carbon by thermal treatment at high temperatures in N2 and CO2 atmosphere. The productivity of catalyst with bamboo-based activated carbon as catalyst carrier after thermal treatment in N2 and CO2 can be increased by 14 and 20%, respectively. Furthermore, based on the influence of pore size on adsorption and reaction of active components, the necessity of expanding pores of carbon was explained in this paper, which pointed out the direction of activated carbon modification.

Nitrogen Ligands on Gas-Phase Oxidation Carbonylation of Dimethyl Carbonate

2011 ◽  
Vol 366 ◽  
pp. 347-351
Author(s):  
Rui Li
Keyword(s):  
Dimethyl Carbonate ◽  
Copper Catalyst ◽  
Methanol Conversion ◽  
Nitrogen Ligand ◽  
Catalytic Activities ◽  
Nitrogen Ligands ◽  
Gas Phase Oxidation ◽  
Space Time Yield ◽  
The Stability ◽  
Supported Copper Catalyst

The effects of nitrogen ligands as pyridine, methylpyridine, 2, 2'-bipyridine and ethylenediamine on the activity and stability of the CBAC supported copper catalyst were investigated. The catalytic activities prepared by nitrogen ligand pretreatment descended compared with the unpretreated support catalysts. This probably related to the disfavored effect of the coordination on the catalysts at the gas-solid reaction manner. The catalysts made by pyridine pretreatment and pore modified supports were superior to the catalysts of unmodified CBAC. Methanol conversion, DMC selectivity and the space-time-yield of DMC of the catalysts by HCl, pyridine pretreatment and pore modification were 28.3%, 97.3% and 165.3 g/(kg•h), respectively. Activity test of 30h showed that pyridine pretreatment can prevent the loss of the active component and enhance the stability of the catalysts.

Adsorption of several acid dyes from aqueous solution using activated carbon derived from teak sawdust: effect of surface acidity

2018 ◽  
Vol 6 (1) ◽  
pp. 530
Author(s):  
Suryadi Ismadji
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Pore Size ◽  
Surface Acidity ◽  
Dye Adsorption ◽  
Langmuir Equation ◽  
Acid Dyes ◽  
Modified Activated Carbon ◽  
Adsorption Data ◽  
Acid Blue

The adsorption of acid blue 9, acid blue 74 and acid orange 51 from aqueous solution using activated carbon derived from teak sawdust was studied in terms of dye molecular size, pore size and surface acidity of activated carbon. The experimental adsorption data were correlated with Langmuir equation. It was found that Langmuir equation could describe the adsorption data well with R2 higher than 0.95. The surface acidity of activated carbon plays a key role in dye adsorption on modified activated carbon. The interaction between the oxygen-free Lewis basic sites and the free electrons of the dye molecule were the main adsorption mechanism in the adsorption process on modified activated carbon. The adsorption capacities of activated carbon on the adsorption of acid dyes decreased in the order unmodified > modified at 100 oC > modified at 150 oC.Keywords: Activated Carbon, Adsorption, Pore Size, Surface Acidity AbstrakAdsorpsi zat warna acid blue 9, acid blue 74, dan orange 51 dari larutan dengan menggunakan karbon aktif yang terbuat dari serbuk gergaji kayu jati dipelajari sebagai fungsi ukuran molekul zat warna, ukuran pori, dan sifat asampermukaan karbon aktif. Data percobaan adsorpsi kemudian dikorelasikan dengan menggunakan persamaan Langmuir. Dari hasil percobaan yang diperoleh dapat dilihat bahwa persamaan Langmuir dapat menggambarkan data adsorpsi isotermal dengan baik dengan R<sup>o</sup> lebih besar dari 0,95. Sifat asam permukaan memegang peranan yang sangat penting pada proses adsorpsi zat warna pada proses adsorpsi zat warna pada karbon aktif yang telah dimodifikasi. Interaksi antara bagian oxygen-free Lewis yang bersifat basa dan elektron-elektron bebas dari molekul zat warna merupakan mekanisme adsorpsi utama pada proses adsorpsi dengan menggunakan karbon aktif yang telah dimodifikasi. Kemampuan adsorpsi karbon aktif terhadap zat warna yang bersifat asam menurun dengan tingkatan karbon aktif tidak dimodifikasi > modifikasi 100 <sup>o</sup>C > modifikasi pada 100 <sup>o</sup>C > modifikasi pada 150 <sup>o</sup>C.Kata kunci: Adsorpsi, karbon aktif, sifat asam permukaan, ukuran pori

REMOVAL OF ARSENATE (V) BY SURFACTANT-MODIFIED ACTIVATED CARBON

2012 ◽  
Vol 11 (8) ◽  
pp. 1433-1438 ◽  
Author(s):  
Jinren Ni ◽  
Guangzhi Zhang ◽  
Hao Hu ◽  
Weiling Sun ◽  
Bin Zhao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Modified Activated Carbon

Trimethylchlorosilane modified activated carbon for the adsorption of VOCs at high humidity

2021 ◽  
pp. 118659
Author(s):  
Zhirui Li ◽  
Yuqi Jin ◽  
Tong Chen ◽  
Feng Tang ◽  
Jie Cai ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Humidity ◽  
Modified Activated Carbon

scholarly journals Iron-modified activated carbon derived from agro-waste for enhanced dye removal from aqueous solutions

Heliyon ◽  
2021 ◽  
pp. e07191
Author(s):  
Fateme Barjasteh-Askari ◽  
Mojtaba Davoudi ◽  
Maryam Dolatabadi ◽  
Saeid Ahmadzadeh
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Dye Removal ◽  
Modified Activated Carbon

Synthesis and characterization of biomass-derived surface-modified activated carbon for enhanced CO2 adsorption

2021 ◽  
Vol 46 ◽  
pp. 101476
Author(s):  
Azeem Sarwar ◽  
Majid Ali ◽  
Asif Hussain Khoja ◽  
Azra Nawar ◽  
Adeel Waqas ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Co2 Adsorption ◽  
Synthesis And Characterization ◽  
Modified Activated Carbon ◽  
Surface Modified

scholarly journals Development of Formaldehyde Adsorption using Modified Activated Carbon – A Review

2012 ◽  
Vol 1 (3) ◽  
pp. 75 ◽  
Author(s):  
W.D.P Rengga ◽  
M. Sudibandriyo ◽  
M Nasikin
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Chemical Activation ◽  
High Energy ◽  
Hydrogen Gas ◽  
Agricultural Product ◽  
Adsorption Method ◽  
Modified Activated Carbon ◽  
Nano Size ◽  
Formaldehyde Adsorption

Gas storage is a technology developed with an adsorptive storage method, in which gases are stored as adsorbed components on the certain adsorbent. Formaldehyde is one of the major indoor gaseous pollutants. Depending on its concentration, formaldehyde may cause minor disorder symptoms to a serious injury. Some of the successful applications of technology for the removal of formaldehyde have been reported. However, this paper presents an overview of several studies on the elimination of formaldehyde that has been done by adsorption method because of its simplicity. The adsorption method does not require high energy and the adsorbent used can be obtained from inexpensive materials. Most researchers used activated carbon as an adsorbent for removal of formaldehyde because of its high adsorption capacity. Activated carbons can be produced from many materials such as coals, woods, or agricultural waste. Some of them were prepared by specific activation methods to improve the surface area. Some researchers also used modified activated carbon by adding specific additive to improve its performance in attracting formaldehyde molecules. Proposed modification methods on activation and additive impregnated carbon are thus discussed in this paper for future development and improvement of formaldehyde adsorption on activated carbon. Specifically, a waste agricultural product is chosen for activated carbon raw material because it is renewable and gives an added value to the materials. The study indicates that the performance of the adsorption of formaldehyde might be improved by using modified activated carbon. Bamboo seems to be the most appropriate raw materials to produce activated carbon combined with applying chemical activation method and addition of metal oxidative catalysts such as Cu or Ag in nano size particles. Bamboo activated carbon can be developed in addition to the capture of formaldehyde as well as the storage of adsorptive hydrogen gas that supports renewable energy. Keywords: adsorption; bamboo; formaldehyde; modified activated carbon; nano size particles

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