Phosphines Supported on Sulfated Zirconia

绝大多数化学品在制造过程中至少有一步是使用固体催化剂制备的。然而，这些反应的效率往往比理论上可能的要低。实现更有效催化反应的一个策略是在固体表面产生具有更多反应位点的材料。在这个项目中，加州大学河滨分校的马修·p·康利博士正在研究实现这一长期挑战的方法。解决这个问题的关键是更好地理解固体表面和这些催化反应位点之间的化学相互作用。康利博士参与了与本研究相关的外展活动，以促进未被充分代表的少数民族参与科学、技术、工程和数学（STEM）学科。康利博士邀请当地高中和社区大学的学生到他的实验室进行暑期实习，将他们介绍给大学的研究环境，鼓励他们进入STEM职业道路。在化学部化学催化项目的资助下，加州大学河滨分校的Matthew P. Conley博士正在研究新的材料平台，以生成定义良好的多相催化剂。这项工作的重点是膦（R3P）与Brønsted酸性氧化物（如硫酸氧化锆）的反应，在氧化物表面产生明确的磷位点。R3P中的取代基影响磷化氢与硫酸氧化锆表面的结合强度，这与该材料表面位置的Brønsted酸度有关。根据接枝反应中有机金属配合物的性质和磷位点上取代基的不同，磷位点与有机金属配合物反应形成明确的催化位点，使乙烯聚合或低聚。上述反应的监测使用光谱技术，如傅里叶变换红外（FT-IR）和固态核磁共振（NMR）。康利博士通过将未被充分代表的少数民族学生带入实验室，参与推广STEM领域，以支持该项目的更广泛影响。来自化学催化项目的资金使康利博士能够为当地高中学生和当地社区大学学生提供暑期实习机会，这些学生来自主要为西班牙裔人口服务的机构。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

A vast majority of chemicals are prepared using solid catalysts in at least one step of the manufacturing process. However, these reactions are often less efficient than theoretically possible. One strategy to achieve more efficient catalytic reactions would be to generate materials with higher amounts of reaction sites on the solid surface. In this project, Dr. Matthew P. Conley of the University of California, Riverside is researching methods to realize this long-standing challenge. A key to solving this problem is a better understanding of the chemical interactions between the solid surface and these catalytically-reactive sites. Dr. Conley is involved in outreach activities related to this research to promote the engagement of underrepresented minorities in science, technology, engineering, and mathematics (STEM) disciplines. Dr. Conley is hosting students from local high schools and community colleges in his laboratory for summer internships to introduce them to the university research environment, which encourages them to enter STEM career paths. With funding from the Chemical Catalysis Program of the Chemistry Division, Dr. Matthew P. Conley of the University of California, Riverside is researching new material platforms to generate well-defined heterogeneous catalysts. This work focuses on the reaction of phosphines (R3P) with Brønsted acidic oxides, such as sulfated zirconium oxide, to generate well-defined phosphonium sites on the oxide surface. The substituents in R3P impact how strongly the phosphine binds to the sulfated zirconium oxide surface, which relates to the Brønsted acidity of surface sites on this material. The phosphonium sites react with organometallic complexes to form well-defined catalytic sites that polymerize or oligomerize ethylene, depending on the nature of the organometallic complex in the grafting reaction and the substituents on the phosphonium site. The above reactions are monitored using spectroscopic techniques, such as Fourier Transformed Infrared (FT-IR) and solid-state Nuclear Magnetic Resonance (NMR). Dr. Conley is involved in promoting STEM fields though outreach activities by bringing underrepresented minority students into the lab, in support of the broader impacts of this project. Funding from this Chemical Catalysis program enables Dr. Conley to provide summer internships to local high school students and local community college students from institutions serving predominately Hispanic populations.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.