Supplementary information

Impact of Precursor Sequence of Addition for One-pot Synthesis of Cr-MCM-41 catalyst nanoparticles to enhance ethane Oxidative

Dehydrogenation with Carbon dioxide

Abdulrhman S. Al-Awadi1, Ahmed Mohamed El-Toni2,3,* Mansour Alhoshan1, Aslam Khan2,

Joselito P. Labis2, Ahmed Al-Fatesh1, Ahmed E. Abasaeed1, Saeed M. Al-Zahrani1

1Chemical Engineering Department, King Saud University, Riyadh 11451, Saudi Arabia

2 King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia

3Central Metallurgical Research and Development Institute, CMRDI, Helwan 11421, Cairo,

Egypt

* Corresponding author: aamohammad@ksu.edu.sa

Fig. S1: Schematic diagram of the catalytic experimental setup

Table S1: pH variation through one-pot Synthesis steps of 8wt%Cr/MCM-41 using different precursor sequence of addition

Synthesis SteppH Value

MCM-41

MCM41-TEOS then Cr

MCM41-Cr then TEOS

Step I

H2O+NH4OH+HTMAL solution

10.95 10.94 10.95

Step II

TESO or Cr additionTEOS addition Cr addition

One hour later 9.64 9.60 9.37

Step III

Cr or TEOS additionCr addition TEOS addition

One more hour later - 8.85 8.87