Photo–thermo Catalytic Oxidation over a TiO₂‐WO₃‐Supported Platinum Catalyst

Abstract

Photo–thermo catalysis, which integrates photocatalysis on semiconductors with thermocatalysis on supported nonplasmonic metals, has emerged as an attractive approach to improve catalytic performance. However, an understanding of the mechanisms in operation is missing from both the thermo‐ and photocatalytic perspectives. Deep insights into photo–thermo catalysis are achieved via the catalytic oxidation of propane (C3H8) over a Pt/TiO2‐WO3 catalyst that severely suffers from oxygen poisoning at high O2/C3H8 ratios. After introducing UV/Vis light, the reaction temperature required to achieve 70 % conversion of C3H8 lowers to a record‐breaking 90 °C from 324 °C and the apparent activation energy drops from 130 kJ mol−1 to 11 kJ mol−1. Furthermore, the reaction order of O2 is −1.4 in dark but reverses to 0.1 under light, thereby suppressing oxygen poisoning of the Pt catalyst. An underlying mechanism is proposed based on direct evidence of the in‐situ‐captured reaction intermediates.

Atomically Dispersed Ru-Decorated TiO 2 Nanosheets for Thermally Assisted Solar-Driven Nitrogen Oxidation into Nitric Oxide

“…The obvious photoresponsive phenomenon for NO production proved that the reaction was driven by photon illumination (Figure 2c). 31 With the increase of temperature from 25 °C to 150 °C (Figure S9), an obvious decay of photoluminescence intensity was observed in Ru SAs/TiO 2 , indicating the reduced electron-hole recombination at higher temperature. Moreover, the NO-TPD profile (Figure S10) showed that NO on Ru SAs/TiO 2 desorbed at 110 and 246 °C.…”

Photo-/thermal synergies in heterogeneous catalysis: Towards low-temperature (solar-driven) processing for sustainable energy and chemicals

“…Although here it is viewed in a specific context and illustrated by examples based on the advantageous coupling of renewable solar (hydrogen) and biomass (oxygenates, CO2) resources, the new phenomenology is clearly fundamental in origin and provides the basis of a new paradigm in applied catalysis. From a broader perspective, equally impressive reports from applications in other fields, e.g., environmental chemistry [205,206], fuel combustion [207], syngas production [208] or coupled solar PV/hydrogen generation [209], have appeared even during the drafting of this review.…”

Bimetallic-Derived Catalysts and Their Application in Simultaneous Upgrading of CO2 and Ethane

“…In this situation, electron spin resonance spectroscopy is an appropriate approach to explore the evolution of these transient oxygen species, due to its extreme sensitivity to paramagnetic features. 142,143 At a steady state, the type and chemical state of oxygen species under reaction conditions can be elucidated by performing AP-XPS measurements of the O 1s feature. To gain a deeper understanding of the variations in oxygen reactivity due to electronic, geometric, and kinetic modifications at a specific orbital level, the total density of state (DOS) is usually calculated and projected to the surface atoms of interest (e.g., O and neighboring metals) using DFT calculations.…”