Titanium dioxide was synthesized using improved method involving sonication and acid activation with comparison of activity with the catalyst synthesized using conventional approach. Studies related to effect of sonication time (5 to 25 min) on the catalyst particle size revealed that sonication drastically reduced the particle size. The catalysts were also characterized by SEM, XRD, FTIR, TGA and TPD methods. The catalyst efficacy was evaluated for isomerization of alpha pinene and the results revealed that 586 nm as the particle size of catalyst obtained using sonochemical synthesis was optimum to achieve maximum conversion of alpha pinene with good selectivity towards bicyclic monoterpenes. At optimized conditions of 0.6% catalyst loading, 586 nm as particle size of catalyst and 40 min of reaction time, alpha pinene was completely isomerized with high selectivity towards bicyclic monoterpenes (camphene, tricyclene and carene). Catalyst reusability study established that the reactivated catalyst showed excellent stability and reusability up to 8 cycles. Overall an improved process for catalyst synthesis based on ultrasound with successful subsequent use in the isomerization reaction has been demonstrated in the current work. The role of ultrasound was clearly established in terms of reduction in particle size and increased number of acidic sites that drive excellent catalytic performance.

使用改进的方法合成二氧化钛，包括超声处理和酸活化，并与使用传统方法合成的催化剂进行活性比较。与超声处理时间（5 到 25 分钟）对催化剂粒度影响相关的研究表明，超声处理显着减小了粒度。还通过SEM、XRD、FTIR、TGA和TPD方法对催化剂进行了表征。评估了α蒎烯异构化的催化剂功效，结果表明，586 nm 作为使用声化学合成获得的催化剂的粒径是最佳的，以实现 α 蒎烯的最大转化率，并具有对双环单萜的良好选择性。在催化剂负载量为 0.6%、催化剂粒径为 586 nm、反应时间为 40 min 的优化条件下，α蒎烯完全异构化，对双环单萜（莰烯、三环烯和蒎烯）具有高选择性。催化剂可重复使用性研究表明，再活化的催化剂表现出优异的稳定性和可重复使用性，最多可重复使用 8 次。总体而言，目前的工作已经证明了一种改进的基于超声波的催化剂合成方法，并成功地随后用于异构化反应。超声波的作用在颗粒尺寸的减小和酸性位点数量的增加方面得到了明确的证实，这些酸性位点驱动了出色的催化性能。总体而言，目前的工作已经证明了一种改进的基于超声波的催化剂合成方法，随后成功地用于异构化反应。超声波的作用在颗粒尺寸的减小和酸性位点数量的增加方面得到了明确的证实，这些酸性位点驱动了出色的催化性能。总体而言，目前的工作已经证明了一种改进的基于超声波的催化剂合成方法，随后成功地用于异构化反应。超声波的作用在颗粒尺寸的减小和酸性位点数量的增加方面得到了明确的证实，这些酸性位点驱动了出色的催化性能。