High H2O2 Utilization Promotes Selective Oxidation of Methane to Methanol at Low Temperature

Abstract

Selective oxidation of methane to methanol has been often considered as a "holy grail" reaction in catalysis. Herein, we systematically investigate the effect of solution pH and Pd-to-Au ratio of AuPd x colloid on the catalytic performance of methane oxidation. It is revealed that these two parameters can determine the amount of H 2 O 2 participated in the reaction, which is linearly related to the productivity of oxygenates. A high catalytic performance in methane activation requires a high utilization of H 2 O 2 to generate more •OH. The optimal pH is 3.0 and the optimal Pd-to-Au ratio is between 0.1 to 0.7.

Highly Dispersed Vanadia Anchored on Protonated g-C3N4 as an Efficient and Selective Catalyst for the Hydroxylation of Benzene into Phenol

“…The catalytic performance of the catalysts was tested in direct hydroxylation of benzene to phenol using H 2 O 2 as the oxidant. According to the literature, H 2 O 2 was relatively stable in weak acidity conditions [ 48 ]. To this end, a mixture of acetonitrile and acetic acid was used as a solvent.…”

Methane Oxidation to Methanol

“…The Au:Pd ratio has also been shown to affect H 2 O 2 utilization and in turn catalytic activity toward methane oxidation. , It should be noted that the activity of such colloidal AuPd nanoparticles has been found to compare favorably to both methane monooxygenase (MMO) and Fe-Cu/ZSM-5 catalysts, although in the case of MMO molecular oxygen is utilized as the terminal oxidant with clear advantages over H 2 O 2 . Agarwal et al .…”

Understanding (photo)electrocatalysis for the conversion of methane to valuable chemicals through partial oxidation processes

“…), and (iii) bimetallic materials ( e.g. Pd@Pt core–shell nanoparticles, 103 Au–Pd alloys, 104 AuPd x colloids, 105 etc. ) have been investigated for the partial oxidation of CH 4 .…”