Junfei Weng

6 Questions 9 Answers 0 Followers

Questions related from Junfei Weng

How many H2 reduction peak exists in Co3O4?

Hi, I'm working on Co3O4 catalysts now. When I do H2-TPR to determine the reducibility of Co3O4, I could observe two peaks, one at ~350C, and the other one at ~405C. However, I could not fit the...

16 April 2021 3,658 8 View

Is the kinetic energy of CO oxidation influenced by CO and O2 concentration?

If the CO and O2 concentration change, how will the kinetic energy of CO oxidation be influenced? Case 1: 3000ppm CO + 10% O2; Case 2: 3000ppm CO + 0.2% O2; Case 3: 2% CO + 10% O2

05 March 2021 4,419 4 View

How to estimate the equivalent deactivation of catalysts aged at different Temperature & Duration?

The catalytic performance is deactivated by aging. Is there a method to estimate the equivalent deactivation under different aging conditions? For example, what is the estimated duration for...

15 January 2021 3,712 7 View

Will humidity affect the signal of CO, CO2, HCs and NOx detected in FTIR?

I'm using FTIR to monitor the adsorption and oxidation of hydrocarbon and NOx on my samples under humidity condition. CO, CO2, HCs and NOx are monitored. Will steam affect the FTIR results? Do I...

12 December 2019 9,165 2 View

I try to grow ZSM-5 film, but lots of powders exist on the surface, instead of forming a film. What are those powders?

I try to grown ZSM-5 film on the substrate. However, instead of forming a film, lots of powders exist on the surface in different size and shape, as shown in the attached figures. I think the...

30 August 2019 1,950 0 View

For 27Al-NMR on self-prepared ZSM-5, why there were two broad peak at 10-40 and 40-60 ppm?

I synthesized some ZSM-5 in my lab and did 27Al-NMR on it. From the literature, generally there was a peak at 55 ppm and 0 ppm to tell framework Al or not. But in my results, although there was a...

23 July 2019 1,140 3 View