Direct and Selective Synthesis of Hydrogen Peroxide over Palladium–Tellurium Catalysts at Ambient Pressure

Abstract

Highly selective hydrogen peroxide (H O ) synthesis directly from H and O is a strongly desired reaction for green processes. Herein a highly efficient palladium-tellurium (Pd-Te/TiO ) catalyst with a selectivity of nearly 100 % toward H O under mild conditions (283 K, 0.1 MPa, and a semi-batch continuous flow reactor) is reported. The size of Pd particles was remarkably reduced from 2.1 nm to 1.4 nm with the addition of Te. The Te-modified Pd surface could significantly weaken the dissociative activation of O , leading to the non-dissociative hydrogenation of O . Density functional theory calculations illuminated the critical role of Te in the selective hydrogenation of O , in that the active sites composed of Pd and Te could significantly restrain side reactions. This work has made significant progress on the development of high-selectivity catalysts for the direct synthesis of H O at ambient pressure.

Looking for the “Dream Catalyst” for Hydrogen Peroxide Production from Hydrogen and Oxygen

“…Almost 100% selectivity toward H 2 O 2 was reported for a Pd-Te catalyst supported on titania with the Pd/Te atomic ratio of 100:1 [86]. By DFT calculations, the role of Te in restraining side reactions was suggested.…”

Recent Advances in the Direct Synthesis of H2O2

“…Further studies have investigated the beneficial role of Zn, Ag, Te, Sb and Ni as secondary metals that are able to enhance catalytic selectivity through enhanced stabilization of O 2 − , as a result of a reduction in the amount of contiguous Pd ensemble sites and an enhancement in the number of isolated Pd sites favourable for H 2 O 2 formation. Table highlights the enhancement in catalytic selectivity towards H 2 O 2 that can be achieved through modification of Pd by secondary non‐precious metals.…”

Solar‐Driven Production of Hydrogen Peroxide from Water and Dioxygen

“…[60][61][62] Thus, extensive efforts have been devoted to achieve direct synthesis of H 2 O 2 from H 2 and O 2 using variousc atalysts, enabling efficient and on-site H 2 O 2 production, which not only significantly reduces the cost for H 2 O 2 synthesis, transport, storage, and handling, but also facilitates the subsequento xidationr eactions. [60][61][62][63][64][65][66][67][68][69][70] However,agas mixture of H 2 andO 2 has potentiale xplosion risk. It is highly desired to produce H 2 O 2 from H 2 Oa nd O 2 without using H 2 .…”