n-Butane has higher value-added applications than isobutane in the petrochemical process. To improve the catalytic performance of isobutane isomerization catalysts, catalysts of mordenite- and alumina-supported platinum were prepared. The intimacy between metal and acid sites and platinum content was investigated. The effect of reaction conditions on the catalytic performance of the catalyst was analyzed by response surface methodology. The characterization results of X-ray diffraction (XRD) patterns, specific surface area, and transmission electron microscope (TEM) confirmed high dispersion of platinum on the catalysts. The results of temperature-programmed desorption of ammonia (NH₃-TPD) indicated that more acid sites existed on millimetre scale and centimetre scale catalysts than on Pt-HM/Al₂O₃ and Pt-Al₂O₃/HM, which led to low selectivity of n-butane. The best yield of n-butane was attained on microscale samples, as the larger diffusion distance inhibited the cracking reaction. The dispersion of reaction products indicated that the increase of platinum content slightly increased the selectivity of n-butane. Compared with Pt-HM/Al₂O₃, Pt-Al₂O₃/HM showed high stability due to fewer carbon deposits in the catalytic reaction process. The optimal reaction condition in isobutane isomerization was T = 413.4°C, liquid hourly space velocity (LHSV) = 5.31 h⁻¹, and P = 2.57 MPa.

中文翻译：

---

丝光沸石和氧化铝负载铂的双功能催化剂用于异丁烷加氢异构化为正丁烷

正丁烷在石油化工过程中具有比异丁烷更高的附加值应用。为了提高异丁烷异构化催化剂的催化性能，制备了丝光沸石和氧化铝负载的铂催化剂。研究了金属和酸性位点以及铂含量之间的密切关系。采用响应面法分析反应条件对催化剂催化性能的影响。X 射线衍射 (XRD) 图案、比表面积和透射电子显微镜 (TEM) 的表征结果证实了铂在催化剂上的高度分散。氨程序升温脱附 (NH ₃ -TPD) 的结果表明，与 Pt-HM/Al 相比，在毫米级和厘米级催化剂上存在更多的酸位。₂ O ₃和Pt-Al ₂ O ₃ /HM，导致正丁烷选择性低。正丁烷的最佳产率在微型样品上获得，因为较大的扩散距离抑制了裂解反应。反应产物的分散表明铂含量的增加略微提高了正丁烷的选择性。与Pt-HM/Al ₂ O ₃相比，Pt-Al ₂ O ₃ /HM在催化反应过程中积碳少，稳定性高。异丁烷异构化的最佳反应条件为 T = 413.4°C, 液时空速 (LHSV) = 5.31 h^-1，且 P = 2.57 MPa。