Methanol Steam Reforming on Bimetallic Catalysts Based on In and Nb Doped Titania or Zirconia: A Support Effect

Abstract

Methanol steam reforming (MSR) is considered an effective method for hydrogen storage and to generate high-quality hydrogen for fuel cells. In this work, a comprehensive investigation of the methanol steam reforming process using a bimetallic Pt–Rh and Cu–Ni based on different oxide supports is presented. Highly dispersed titania and zirconia doped with indium and niobium ions were synthesized by sol–gel method. The effect of the nature and quantity of the dopant cation (In, Nb) on the catalytic performance of titania supported metal catalysts was investigated. The conclusions obtained show a significant effect of both the metal alloy and the oxide support nature on the activity and selectivity of the methanol steam reforming process. Pt–Rh alloy catalyst shows higher hydrogen yield, but its selectivity in the MSR process is lower than for the catalysts containing the Cu0.8-Ni0.2 alloy. Heterovalent indium doping of titania leads to the catalytic activity increase. It was suggested that this is due to the defects formation in the oxygen TiO2 sublattice. On the contrary, the use of niobium oxide as a dopant decreases the catalyst activity in the methanol steam reforming process but leads to the selectivity increase in the studied process.

Methanol Steam Reforming in the Traditional and Membrane Reactors over Pt-Rh/TiO2-In2O3 Catalyst Using Surface-Treated Pd-Cu Foil Membranes

“…The catalyst (Pt-Rh/TiO 2 -In 2 O 3 ) was prepared by sequential reduction of metal precursors (hexachloroplatinic acid and rhodium III chloride) at room temperature in the liquid phase using 0.5 M NaBH 4 as a reducing agent [10].…”

Modulating the active phase in perovskite LaCoO3 with B-site doping of Cu for efficient methanol reforming to produce hydrogen

“…2 The majority of research on methanol steam reforming has centered around using active metal catalysts, especially copper-based and noble metal-based catalysts. [3][4][5][6] Cu-based catalysts have received wide attention because of low cost and high H 2 selectivity. [7][8][9][10] However, the migration deactivation of copper-based catalysts at high temperature is a key issue in catalyst research.…”

Efficient methanol steam reforming over ZnCeZrOx: the unique role of cerium

“…The formation of a mixed metal oxide with Ce is an efficient method to generate Ov because ceria oxide with excellent redox properties (Ce 4+ /Ce 3+ ) enables easy oxygen exchange through oxygen vacancies, which not only improves the structure stability of the catalysts but also avoids carbon accumulation. 34–38…”

“…The formation of a mixed metal oxide with Ce is an efficient method to generate Ov because ceria oxide with excellent redox properties (Ce 4+ /Ce 3+ ) enables easy oxygen exchange through oxygen vacancies, which not only improves the structure stability of the catalysts but also avoids carbon accumulation. [34][35][36][37][38] Herein, we report the preparation of ternary ZnCeZrO x catalysts for SRM and the effects of Ce doping on the performance and durability of these catalysts. The results show that the Ce-doped ZnCeZrO x is more active and stable than ZnZrO x in SRM, which is mainly attributed to the high stability of its solid solution structure, its high H 2 O activation activity and less surface carbon deposition.…”