Julián Sánchez

12 Questions 14 Answers 0 Followers

Questions related from Julián Sánchez

Change in the surface area after modification?

Hello, dear Scientists I would like to know why in some cases, if you impregnate metal in a support (in different percentages, e.g.: 1%, 2%, 4%) the surface area of the final material do not...

10 October 2019 7,540 5 View

Coordination of ketones to iron?

Hello everyone, I would like to know if someone have a reference or a possible explanation about if ketones (2-propanone or ethyl acetate) could coordinate to iron (metal or cation)? Since...

09 September 2019 1,381 4 View

I have a error in gaussian G09 :( I need help? transition state?

Hi dear scientists! I am trying to find a transition state using QST2 and rob3ylp 6-31g(d,p)... Nevertheless, in all cases my run fails.. The next paragraph appear in my file.log: "Old...

02 February 2019 2,027 7 View

How can I explain that after incorporation of metal over surface of mesoporous materials, the acidity increase with a lower amount of metal....????

Hi dear Scientists! :) I was impregnating Fe or Cu over different mesoporous materials, and after TPDA analysis I concluding that when I decrease the percentage of metal over surface of...

11 November 2018 1,302 5 View

About acidity analysis with pyridine. ?

Hi everyone, I just have a problem to determine the amount in mili o micro moles of pyridine adsorbed in a material. I only have results of area of pyridine from company that they did the...

07 July 2018 9,228 1 View

What is the difference between intermediate and intermediary?

Hi everybody! I have a partner in the laboratory that don't believe me (Miguel at Antioquia University- Colombia) about what is the difference between intermediate and intermediary? Is it...

04 April 2018 3,492 3 View

About acidity of MCM-41 and SBA-15?

Hi scientists! I have a question related with the acidity of MCM-41 and SBA-15. I know that both supports present a low acidity (that could be verified by TPD of ammonia). But, I would like to...

04 April 2018 6,516 0 View

How to choose the best model in a experimental design? Box-Behken design vs central-composite design?

Hi Scientists!! I am trying to choose the best model in a experimental arrangement of four factors and three levels. I don't know what model is more correct? I chose Box-Behken but I am thinking...

10 October 2017 1,210 11 View

What is more stable: Ortho or para hydrogen?

I was reading about this interesting topic and I don't understand what could be the more stable kind of hydrogen. This could influence the storage of hydrogen? Thanks a lot, Julián S.

09 September 2017 4,730 2 View

How to explain the second step in the reaction mechanism of alpha pinene epoxide with ethanol and temperature?

Hi, I'm trying to explain the formation of the final compound in the reaction of alpha pinene epoxide with ethanol, a very interesting topic in the formation of add-value chemical substances. I...

08 August 2017 10,097 4 View

How to work catalysts and solid phase using Gaussian?

Hi everybody, Actually, I am simulating some process using Gaussian G09, specifically some molecules adsorbed over silica. But, I don't know how to explain if Gaussian works in gas-phase, what...

03 March 2017 9,219 4 View

How to write input file to run transition state in gaussian (QST2) I presented some problems?

Hi everybody, I have a problem with my input file to run a transition state in gaussian (G09). When I try to run my file, the output file present this problem " ***** Convergence failure in GTrans...

12 December 2016 7,936 2 View