Catalytic Properties of Heusler Alloys for Steam Reforming of Methanol

Abstract

Intermetallic compounds have attracted research attention in catalysis because of their unique catalytic properties. Recently, a group of intermetallic compounds, referred to as Heusler alloys (X2YZ), has been investigated as new catalysts. In this study, catalytic properties of 14 Heusler alloys with X = Fe, Co, Ni, or Cu; Y = Ti, Mn, or Fe; Z = Al, Si, Ga, Ge, or Sn for the steam reforming of methanol were examined. Co2TiAl and Ni2TiAl alloys exhibited relatively high H2 production rates because of the formation of fine particles via the selective oxidation of Ti. X2MnZ alloys exhibited high CO2 selectivity because of a water-gas shift reaction catalyzed by using MnO that was formed during the reaction. Crystal phases, surface microstructures, and surface compositions of most alloys were changed because of the reaction, and the formation of fine particles possibly assisted in the observation of catalytic activity. Heusler alloys can be beneficial as catalyst precursors by the selection of appropriate elemental sets depending on target reactions.

Synthesis of Co2FeGe Heusler alloy nanoparticles and catalysis for selective hydrogenation of propyne

“…This intermetallic group is popular as magnetic, thermoelectric, shape memory and topological materials while we have opened its new function as catalysts. [10][11][12][13][14] For selective hydrogenation of alkynes, Co 2 FeGe Heusler alloy showed intrinsically high alkene selectivity; that is, it selectively hydrogenated alkynes but hardly hydrogenated alkenes even for hydrogenation of alkene reactants without alkynes. 11 In addition, the systematic control of catalytic properties by elemental substitution (Co 2 Mn x Fe 1Àx -Ga y Ge 1Ày ) was demonstrated.…”

High catalytic performance of Al–Pd–(Ru, Fe) icosahedral approximants for acetylene semi-hydrogenation

“…Intermetallic compounds (IMCs) exhibit a wide range of attractive functions and characteristics that are not attainable in ordinary elemental metals, such as a shape memory effect, 1 superconductivity. 2 and hydrogen absorption 3 They also possess excellent properties for hydrogenation catalysis, such as those demonstrated in Heusler alloys, 4,5 Zintl phases, 6 and hydrogen absorbing alloys. 3,7,8 Quasicrystals 9 are complex IMCs with aperiodic structures that oen exhibit ve-fold symmetry.…”

Properties of Bulk In‐Pt Intermetallic Compounds in Methanol Steam Reforming

“…The altered electronic structure and geometric effects of these materials result in changed and often beneficial catalytic properties compared to their parent metals [4] . Among the most intensively studied reactions with intermetallic compounds as catalytic materials is methanol steam reforming [MSR, Equation (1)] [5–14] . One of the major concerns in this reaction is suppressing CO formation via methanol decomposition [MD, Eq.…”

“…[4] Among the most intensively studied reactions with intermetallic compounds as catalytic materials is methanol steam reforming [MSR, Equation (1)]. [5][6][7][8][9][10][11][12][13][14] One of the major concerns in this reaction is suppressing CO formation via methanol decomposition [MD, Eq. ( 2)] or the reverse water gas shift reaction [rWGSR, Eq.…”