Catalyst Deactivation and Regeneration Studies as a Probe to Improve the Catalytic Properties of Supported Solid Acid Catalysts

理查德·D·冈萨雷斯教授的建议是，通过增加活性和抗结焦的硫酸盐物种的浓度，最大限度地提高用于正丁烷异构化的硫酸化氧化锆催化剂的性能。通过溶胶-凝胶法和二氧化硅共沉积或在高比表面积二氧化硅载体上沉积溶胶-凝胶法氧化锆，然后进行热处理和硫酸盐化，制备了硫酸化氧化锆。将使用几种技术来将合成和处理过程与活性硫酸盐物种的分数和催化性能联系起来。它们包括：反应的失活曲线，SO2和CO2的热重-红外光谱(TG-IR)，特别是600℃下的SO2，用TG-IR测定焦炭沉积，用吸附的吡啶的IR测定Broensted/Lewis酸度比。这项研究的意义是基于对用于烷烃活化的固体酸催化剂的持续需求，该催化剂将取代对环境有风险的液态酸催化剂。

Professor Richard D. Gonzalez' proposal is to maximize the performance of sulfated zirconia catalysts for n-butane isomerization by increasing the concentration of sulfate species that are active and resistant to coking. The sulfated zirconia will be prepared by co-deposition of sol-gel zirconia and silica or deposition of sol-gel zirconia on high-surface area silica support, followed by thermal treatment and sulfation. Several techniques will be used to relate the synthesis and treatment procedure to the fraction of active sulfate species and the catalytic performance. They include: deactivation profiles from the reaction, thermogravimetry-infrared spectroscopy (TG-IR) of SO2 and CO2 evolution, in particular SO2 at 600 C, coke deposition measured with TG-IR, and Broensted to Lewis acidity ratio determined by IR of adsorbed pyridine. The study's significance is based on the ongoing need for solid acid catalysts for alkane activation that would replace the environmentally risky liquid acid catalysts.