Effect of the Pt Precursor and Loading on the Structural Parameters and Catalytic Properties of Pt/Al2O3

被引：23

作者：

Borges, Lais R. ^{[1
]}

Lopez-Castillo, Alejandro ^{[2
]}

Meira, Debora M. ^{[1
]}

Gallo, Jean Marcel R. ^{[2
]}

Zanchet, Daniela ^{[3
]}

Bueno, Jose Maria C. ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Chem Engn, Rod Washington Luis S-N,Km 235,POB 676, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Chem, Rod Washington Luis S-N,Km 235,POB 676, BR-13565905 Sao Carlos, SP, Brazil

[3] Univ Estadual Campinas, Inst Chem, Rod Washington Luis S-N,Km 235,POB 676, BR-13565905 Sao Carlos, SP, Brazil

来源：

CHEMCATCHEM | 2019年 / 11卷 / 13期

基金：

巴西圣保罗研究基金会;

关键词：

Water gas shift reaction; Pt-alumina catalysts; Pt-0; sites; oxygen density; heterogeneous catalysis; SUPPORTED METAL-CATALYSTS; GAS SHIFT REACTION; INFRARED-SPECTROSCOPY; GAMMA-ALUMINA; PLATINUM NANOPARTICLES; PARTICLE MORPHOLOGY; SIZE DEPENDENCE; CO ADSORPTION; FT-IR; WATER;

D O I：

10.1002/cctc.201900092

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of promoters and additives on the electronic properties and structural properties of Pt catalysts still need to be understood. The present work investigates the effects of the Pt loading and the use of chloride additive on the structural properties of Pt/Al2O3 and its catalytic activity towards the WGS reaction. The presence of Cl affected the morphology and oxygen coverage of the Pt nanoparticles. However, these parameters did not affect the surface electronic properties, due to a compensation effect between the size of the Pt-0 core and oxygen coordinated on the shell (NPt-O). Despite the structural differences, the catalytic activity for the WGS reaction was similar for the chloride-free sample and the catalyst containing chloride. The effect of the Pt loading was also studied, with the "apparent" catalytic activity per site of Pt (TOF) decreasing with increasing metal loading. Increasing the Pt loading led to an increase of the low-coordination Pt-0 sites at the surface of the NPs, resulting in stronger Pt-CO integration and consequent poisoning of the active sites.

引用

页码：3064 / 3074

页数：11

共 75 条

[1] ELECTRONIC-STRUCTURE CALCULATIONS ON WORKSTATION COMPUTERS - THE PROGRAM SYSTEM TURBOMOLE [J].