Complete and Rapid Conversion of Hydrazine Monohydrate to Hydrogen over Supported Ni–Pt Nanoparticles on Mesoporous Ceria for Chemical Hydrogen Storage

Abstract

The development of active, selective, and robust catalysts is a key issue in promoting the practical application of hydrazine monohydrate (N2 H4 ⋅H2 O) as a viable hydrogen carrier. Herein, the synthesis of a supported Ni-Pt bimetallic nanocatalyst on mesoporous ceria by a one-pot evaporation-induced self-assembly method is reported. The catalyst exhibits exceptionally high catalytic activity, 100 % selectivity, and satisfactory stability in promoting H2 generation from an alkaline solution of N2 H4 ⋅H2 O at moderate temperatures. For example, the Ni60 Pt40 /CeO2 catalyst enabled complete decomposition of N2 H4 ⋅H2 O to generate H2 at a rate of 293 h(-1) at 30 °C in the presence of 2 M NaOH, which compares favorably with the reported N2 H4 ⋅H2 O decomposition catalysts. Phase/structural analysis by XRD, TEM, and Auger electron spectroscopy was conducted to gain insight into the excellent catalytic performance of the Ni-Pt/CeO2 catalyst.

Tuning the Surface Composition of Ni/meso‐CeO2 with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

“…In this regard, the deposition of noble metals onto the surface of a non‐noble metal through the galvanic replacement reaction provides a viable means for enhancing the atom efficiency of noble metals . In addition, the immobilization of catalyst nanoparticles on a mesoporous support enables enhanced access of reactants to the active sites, thereby implying improved activity …”

“…It was found that alloying Ni with noble metals, such as Pt, Ir, Rh, or Pd, resulted in remarkable improvement to the catalytic activity and H 2 selectivity . In particular, immobilized Ni−Pt or Ni−Ir alloy nanoparticles on alkaline metal oxides (e.g., CeO 2 , La 2 O 3 ) enabled the complete decomposition of N 2 H 4 ⋅ H 2 O at mild temperatures with 100 % H 2 selectivity . Generally, however, the catalytic performance of state‐of‐the‐art N 2 H 4 ⋅ H 2 O decomposition catalysts is still far from that required for practical H 2 ‐source applications.…”

“…In the past decade, significant progresses has been made in developing active and selective catalysts for promoting H 2 generation from N 2 H 4 ⋅ H 2 O. It was found that alloying Ni with noble metals, such as Pt, Ir, Rh, or Pd, resulted in remarkable improvement to the catalytic activity and H 2 selectivity . In particular, immobilized Ni−Pt or Ni−Ir alloy nanoparticles on alkaline metal oxides (e.g., CeO 2 , La 2 O 3 ) enabled the complete decomposition of N 2 H 4 ⋅ H 2 O at mild temperatures with 100 % H 2 selectivity .…”

Pt-Ni Nanoalloys for H2 Generation from Hydrous Hydrazine

“…Based on the previously reported literature, we found that most of the papers were based on the dehydrogenation of hydrous hydrazine on different supports supported with different proportions of Ni-Pt bimetallic catalysts [58][59][60]. The noble metal Pt has high reduction potential and stability, so it is easier to prepare new structures [61].…”

Nanopore‐Supported Metal Nanocatalysts for Efficient Hydrogen Generation from Liquid‐Phase Chemical Hydrogen Storage Materials

“…Besides MOFs and porous carbon materials, some other porous materials, such as mesoporous alumina, [209,213] mesoporous ceria, [210] mesoporous silica, [174,214] and titanate nanotubes [212] were also used as supports to immobilize metal NPs for the H 2 generation from hydrous hydrazine. Moreover, to improve the catalytic activity, the multicomponent composites were used as supports to immobilize metal NPs for the H 2 production.…”