Kojima Takayuki, Kameoka Satoshi, Tsai An-Pang
Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Sendai 980-8578, Japan.
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan.
ACS Omega. 2019 Dec 13;4(26):21666-21674. doi: 10.1021/acsomega.9b01837. eCollection 2019 Dec 24.
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 (XYZ), 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. CoTiAl and NiTiAl alloys exhibited relatively high H production rates because of the formation of fine particles via the selective oxidation of Ti. XMnZ alloys exhibited high CO 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.
金属间化合物因其独特的催化性能而在催化领域引起了研究关注。最近，一类被称为赫斯勒合金（XYZ）的金属间化合物作为新型催化剂受到了研究。在本研究中，考察了14种X = Fe、Co、Ni或Cu；Y = Ti、Mn或Fe；Z = Al、Si、Ga、Ge或Sn的赫斯勒合金对甲醇蒸汽重整的催化性能。CoTiAl和NiTiAl合金由于通过Ti的选择性氧化形成细颗粒而表现出相对较高的氢气生成速率。XMnZ合金由于反应过程中形成的MnO催化的水煤气变换反应而表现出高CO选择性。大多数合金的晶相、表面微观结构和表面组成因反应而发生变化，细颗粒的形成可能有助于观察催化活性。通过根据目标反应选择合适的元素组合，赫斯勒合金作为催化剂前体可能是有益的。
