slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
2013-04-20 PowerPoint Presentation
Download Presentation
2013-04-20

Loading in 2 Seconds...

play fullscreen
1 / 23

2013-04-20 - PowerPoint PPT Presentation


  • 115 Views
  • Uploaded on

天津大学化工学院. 碳载体孔容结构和钴颗粒尺寸对钴基催化剂费托性能的 影响. 学科专业:化学工艺 报告学生:付廷俊 指导教师:李振花 研究员. 2013-04-20. 主要内容. 1. 研究背景. 2. 实验方法与实验装置. 3. 实验结果及讨论. 4. 结 论. 1.1 催化剂微观结构与费托反应活性的相互关系. The FT activity of supported cobalt catalyst. The area of the exposed metallic cobalt atoms.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '2013-04-20' - ariana-dyer


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

天津大学化工学院

碳载体孔容结构和钴颗粒尺寸对钴基催化剂费托性能的影响

学科专业:化学工艺

报告学生:付廷俊

指导教师:李振花 研究员

2013-04-20

slide2

主要内容

1. 研究背景

2. 实验方法与实验装置

3. 实验结果及讨论

4. 结 论

slide3

1.1 催化剂微观结构与费托反应活性的相互关系

The FT activity of

supported cobalt catalyst

The area of the exposed

metallic cobalt atoms

Pore diameter of support

Cobalt dispersion

and reducibility

Textual properties of

supports

slide4

1.2 钴基催化剂载体种类对费托反应的影响

Conventional support materials:

Titania,alumina , silica and zirconia.

Canyield cobalt species with high dispersion.

But highly dispersed cobalt species could be reduced only at elevated temperatures (exceeding 1000K).

Textural properties

New support materials:

CNTs, Cs CNF

Can allow great metal dispersion.

Highly dispersed cobalt species could be reduced at lower.

?

slide5

主要内容

1. 研究背景

2. 实验方法与实验装置

3. 实验结果及讨论

4. 结 论

slide6

催化剂

等体积浸渍

静置

干燥

还原

热焙烧

2.1 催化剂的制备

载体:CNTs8、 CNTs20 、 CNTs60、AC

前驱体:Co(NO3)26H2O

:Co/CNTs8

:Co/ CNTs20

:Co/ CNTs60

: Co/AC

slide7

2.2表征方法

  • 氮气物理吸附(BET)
  • 程序升温脱附(TPD)
  • 程序升温还原(TPR)
  • X射线衍射(XRD)
  • 透射电镜(TEM)
slide8

2.3 F-T合成反应评价装置

170C

 4C

Instu-reduced condition:

H2 100 ml/min,400 C10 h

Reaction conditions:

P= 2.0 MPa,T = 230 C,H2/CO = 2,WHSV=6750 /5400mL/(h.g)

8

slide9

主要内容

1. 研究背景

2. 实验方法与实验装置

3. 实验结果及讨论

4. 结 论

slide10

3.1催化剂及载体的氮吸附脱附表征

Table 1 Textual properties of carbon supports and as prepared catalysts obtainedby N2 adsorption–desorption.

Tianjin University

slide11

3.2 载体的石墨化程度

Fig. 1. XRD patterns of carbon materials

slide12

3.3催化剂的XRD及TEM表征

Fig.2. XRD patterns and TEM images of as-prepared catalysts .

Tianjin University

slide13

3.4 还原后催化剂的微观形貌 -- TEM

a

b

c

d

Fig.3. TEM images of the different catalysts after reduction followed by a passivation treatment. a:Co/AC, b:Co/CNTs8, c:Co/CNTs20, d:Co/CNTS60

Tianjin University

slide14

3.5催化剂微观结构的定量计算

Table 2 Cobalt particle size and dispersion measured from TEM, XRD and H2chemisorption.

.I determined by the molar volume correction of corresponding Co3O4 size of unreduced catalysts using the equation d(Co) = 0.75d(Co3O4).

II Assuming H2/Co =2.

Tianjin University

slide15

3.6 催化剂的氢还原性能

Table 3 Quantitative analysis of the H2-TPR profiles of the as-prepared catalysts

Tianjin University

slide16

3.7 费托合成反应性能

Table 4 The F-T Synthesis results of the different carbon supported Co catalysts

  • a mainly for C2-C4 products
slide17

3.8费托合成反应烯烷比与C5+的关系

Fig.4. Relation between the C2-C4olefin/paraffin ratio and

the C5+ selectivity on different catalysts.

Tianjin University

slide18

3.9 费托合成反应TOF的影响因素

Fig.5. Relation between the TOF and the pore size on different catalysts.

Tianjin University

slide19

3.10 费托合成反应TOF的影响因素

Fig.6. Relation between the TOF and cobalt size on different catalysts.

Tianjin University

slide20

3.11 费托合成催化剂分散度的影响因素

Fig.7. Relation between the cobalt dispersion and cobalt size on different catalysts.

Tianjin University

slide21

主要内容

1. 研究背景

2. 实验方法与实验装置

3. 实验结果及讨论

4. 下一步计划

slide22

4. 下一步计划

1. 整理实验数据,看文献。

2. 继续开展管外钴落位调控及自还原的相关实验。

Tianjin University

slide23

谢谢大家!

期待各位专家提出宝贵意见和建议