Co-promoted MoS₂/Al₂O₃ is the industrial-widely used catalyst for hydrogen production by water-gas shift (WGS) reaction under sulfur-containing condition. Despite of the intensive physicochemical characterizations, the intrinsic activities of Co-promoted and unprompted sites on this catalyst are still unreported, mainly owning to the lack of quantification method of catalytic sulfide sites. With low temperature CO adsorption followed by IR spectroscopy, a distinguish technique developed by our group, this short communication reports the temperature-dependent TOFs (turnover frequencies) of these two sites, and reveals that Co-promoted site is intrinsically much more active than unprompted site at low temperatures, while these two sites are catalytically comparable at higher reaction temperatures. The catalytically different performances are related to the different apparent activation energies of WGS reaction on these two sites. This work fills in the long-standing gaps in hydrogen production by WGS reaction over sulfided CoMo/Al₂O₃ catalyst.

共同促进的MoS ₂ / Al ₂ O ₃是在含硫条件下通过水煤气变换（WGS）反应生产氢的工业上广泛使用的催化剂。尽管进行了深入的理化表征，但仍未报告该催化剂上共促进和未促进位点的固有活性，这主要归因于缺乏催化硫化物位点的定量方法。我们小组开发了一种独特的技术，在低温CO吸附之后进行IR光谱分析，这种简短的交流报道了这两个位置的温度依赖性TOF（转换频率），并揭示了共促进位点本质上比未提示的位点要活跃得多。在低温下，这两个位点在较高的反应温度下具有催化可比性。催化上不同的性能与这两个位置上WGS反应的不同表观活化能有关。这项工作填补了硫化CoMo / Al上WGS反应制氢的长期空白₂ O ₃催化剂。