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高分散SnO/TiO催化剂的制备及其催化多元醇酯的性能

Preparation of highly dispersed SnO/TiO catalysts and their performances in catalyzing polyol ester.

作者信息

Su Huaigang, Zhao Qin, Jiang Cheng, Wang Yanan, Niu Yongfang, Li Xuelian, Lou Wenjing, Qi Yanxing, Wang Xiaobo

机构信息

State Key Laboratory of Solid Lubrication, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, CAS Lanzhou 730000 China

University of Chinese Academy of Sciences Beijing 100049 China.

出版信息

RSC Adv. 2023 Mar 17;13(13):8934-8941. doi: 10.1039/d2ra07334j. eCollection 2023 Mar 14.

DOI:10.1039/d2ra07334j
PMID:36936835
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10021077/
Abstract

A series of stannous oxide supported on rutile titanium dioxide (SnO/TiO) were prepared by a conventional incipient wetness impregnation method, and their performance as catalysts for fatty acid esterification reactions was investigated. The effects of Sn precursors (SnCl·2HO or SnCO), loading amounts (5-15%), and treating ambiences (air and N) were explored. The optimized 10% SnO/TiO-Cl with SnCl·2HO as the Sn precursor and thermal treatment in N showed the best esterification performance. Specifically, 10% SnO/TiO-Cl catalyzed the esterification process of trimethylolpropane and -octanoic acid with a conversion of 99.6% over 5 h at 160 °C, and 10% SnO/TiO-Cl was efficient for six catalytic cycles. Based on the results of X-ray diffraction (XRD), Raman spectra, high-resolution transmission electron microscopy (HRTEM), infrared spectra of pyridine adsorption (Py-IR), and ammonia temperature programmed desorption (NH-TPD), the improved catalytic performance is supposed to be attributable to the high dispersion of the Sn species on 10% SnO/TiO-Cl as the moderate Lewis acid sites.

摘要

采用传统的初湿浸渍法制备了一系列负载在金红石型二氧化钛上的氧化亚锡（SnO/TiO），并研究了它们作为脂肪酸酯化反应催化剂的性能。探讨了锡前驱体（SnCl·2HO或SnCO）、负载量（5-15%）和处理气氛（空气和氮气）的影响。以SnCl·2HO作为锡前驱体并在氮气中进行热处理的优化后的10% SnO/TiO-Cl表现出最佳的酯化性能。具体而言，10% SnO/TiO-Cl在160℃下催化三羟甲基丙烷和辛酸的酯化过程，5小时内转化率达到99.6%，并且10% SnO/TiO-Cl在六个催化循环中都很高效。基于X射线衍射（XRD）、拉曼光谱、高分辨率透射电子显微镜（HRTEM）、吡啶吸附红外光谱（Py-IR）和氨程序升温脱附（NH-TPD）的结果，认为催化性能的提高归因于10% SnO/TiO-Cl上锡物种的高度分散以及适度的路易斯酸位点。

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