The heterostructural Bi₄Ti₃O₁₂-SrTiO₃ (or BIT-STO) platelets with various STO contents (i.e., 40, 65, and 100%) were synthesized by the topochemical conversion of well-defined BIT platelets via the alkaline hydrothermal treatment. The surface properties of synthesized BIT-STO platelets were characterized, and probed by the temperature-programmed surface reaction of isopropanol (IPA). It is found that all BIT-STO catalysts are highly selective in IPA dehydrogenation (to yield acetone) as opposed to IPA dehydration (to yield propene). With the increase in STO content, the desorption temperature of acetone from the BIT-STO surface gradually decreases, suggestive of an improved IPA dehydrogenation activity. The BIT-derived STO exhibits much higher activity and selectivity in IPA dehydrogenation in comparison to the hydrothermally-synthesized STO and commercial STO, which is attributed to the desirable (1 0 0) facet with abundant surface defects formed during the topochemical conversion. In-situ infrared spectroscopy indicates that upon IPA adsorption, the BIT-derived STO shows a higher proportion of bridged isopropoxide (IPO) presents on the surface than the reference STO samples. It is proposed that the abundant oxygen vacancies present on the surface of BIT-derived STO could facilitate the bridged adsorption of IPO intermediate that favors further decomposition into acetone, thus promoting the selective IPA dehydrogenation.

具有不同 STO 含量（即40、65 和 100%）的异质结构 Bi ₄ Ti ₃ O ₁₂ -SrTiO _{3 （或 BIT-STO）片晶是}通过定义明确的 BIT 片晶的拓扑化学转化合成的碱性水热处理。对合成的 BIT-STO 血小板的表面特性进行了表征，并通过异丙醇 (IPA) 的程序升温表面反应进行了探测。结果发现，与 IPA 脱水（产生丙烯）相反，所有 BIT-STO 催化剂在 IPA 脱氢（产生丙酮）中均具有高选择性。随着 STO 含量的增加，丙酮从 BIT-STO 表面的解吸温度逐渐降低，表明 IPA 脱氢活性提高。与水热合成的 STO 和商业 STO 相比，BIT 衍生的 STO 在 IPA 脱氢中表现出更高的活性和选择性，这归因于理想的 (1  0 0) 表面化学转化过程中形成大量表面缺陷的小平面。原位红外光谱表明，在 IPA 吸附后，BIT 衍生的 STO 显示出比参考 STO 样品更高比例的桥接异丙醇 (IPO)。有人提出，BIT 衍生的 STO 表面存在的丰富氧空位可以促进 IPO 中间体的桥接吸附，有利于进一步分解成丙酮，从而促进选择性 IPA 脱氢。

具有不同 STO 含量（即40、65 和 100%）的异质结构 Bi ₄ Ti ₃ O ₁₂ -SrTiO _{3 （或 BIT-STO）片晶是}通过定义明确的 BIT 片晶的拓扑化学转化合成的碱性水热处理。对合成的 BIT-STO 血小板的表面特性进行了表征，并通过异丙醇 (IPA) 的程序升温表面反应进行了探测。结果发现，与 IPA 脱水（产生丙烯）相反，所有 BIT-STO 催化剂在 IPA 脱氢（产生丙酮）中均具有高选择性。随着 STO 含量的增加，丙酮从 BIT-STO 表面的解吸温度逐渐降低，表明 IPA 脱氢活性提高。与水热合成的 STO 和商业 STO 相比，BIT 衍生的 STO 在 IPA 脱氢中表现出更高的活性和选择性，这归因于理想的 (1  0 0) 表面化学转化过程中形成大量表面缺陷的小平面。原位红外光谱表明，在 IPA 吸附后，BIT 衍生的 STO 显示出比参考 STO 样品更高比例的桥接异丙醇 (IPO)。有人提出，BIT 衍生的 STO 表面存在的丰富氧空位可以促进 IPO 中间体的桥接吸附，有利于进一步分解成丙酮，从而促进选择性 IPA 脱氢。