Ultraviolet Raman Spectroscopy: Cracking the Bottleneck of Catalyst Technology

The new materials, as the basis and precursor of high-tech, have a wide range of applications and are the most important and most promising areas for the 21st century. The development of new materials is inseparable from the use of catalysts. Dalian Institute of Chemical Technology has gathered science and technology research team more than ten years of wisdom and hard work, studied the catalytic material UV Raman spectroscopy technology, cracked a number of key technical problems of catalytic materials, in order to break through the urgent needs of the national construction, leading the future development of key materials and technologies Provides important technical support. This achievement also won the 2011 National Natural Science Second Prize.

Academician Li Can, a leader in the research of ultra-violet Raman spectroscopy of catalytic materials, told reporters that precious metals play an important role in many fields as an irreplaceable catalyst in chemical reactions. However, scarce resources are expensive, which is undoubtedly a difficult problem in catalyst manufacturing. Ultraviolet Raman spectroscopy is the golden key to solving this problem. Ultraviolet Raman spectroscopy is a non-invasive, high-sensitivity measurement technique with a wide range of applications in the fields of physics, chemistry, biology, mineralogy, materials science, archaeology, and quality control of industrial products. A powerful tool for configuration, material composition identification, and structural analysis.

Ultraviolet Raman spectroscopy cracked the development bottleneck of catalytic materials in the world, solved the key scientific problems of catalytic materials, and achieved four breakthroughs. One is the use of ultraviolet resonance Raman spectroscopy to solve the structural identification problems of the framework metal active centers in a series of important molecular sieve materials. A novel characterization method for the identification of the active centers of transition metal heteroatoms in microporous and mesoporous molecular sieves was established. Not only can precious metals be saved significantly, but the monolithic relatively homogeneous catalytic environment is expected to achieve high selectivity in chemical reactions and reduce the occurrence of by-products. To achieve true green catalysis.

The second is UV Raman spectroscopy to study the surface phase structure of metal oxide catalytic materials. It is found that the surface and bulk phases of metal oxides often have different phase structures. The surface and bulk phase transitions during phase formation are not synchronous. In the research of solar photocatalytic materials, it is found that the surface phase structure and photocatalytic activity are directly related, and the concept of “surface heterogeneous and heterojunction enhanced photocatalytic activity” is proposed.

The third is the development of in-situ UV Raman spectroscopy in the synthesis of hydrothermal catalytic materials. Observed the molecular fragments in the early stage of molecular sieve synthesis and the microporous structure formed by the interaction between the template agent and the molecular fragments. The important intermediates for the initial formation of molecular sieves were proposed. The body determines the mechanism of the final molecular sieve structure. Their research has developed new methods for characterizing catalytic materials, discovered important conversion processes for the synthesis of catalytic materials, and intermediate species in active centers, and proposed a mechanism for the synthesis of catalytic materials.

The fourth is to obtain a heterogeneous chiral catalyst that is comparable to homogeneous asymmetric catalysis. The catalyst is one of a large class of compounds - chiral compounds, and chiral drugs are very important branches of chiral compounds. Chiral drugs refer to single enantiomeric compounds that possess the chemical structure of levorotatory or dextrorotatory enantiomers and include optically pure drugs, optically pure agrochemicals, and other optically pure products and intermediates. Using “chiral” technology, one can effectively eliminate components that are ineffective or have toxic side effects in the drug to produce pure chiral drugs with a single directional structure, so that the drug components are more pure and the efficacy is faster in treating diseases. Shorter course of treatment. The research on chiral drugs has now become one of the new directions for international new drug research. In the international pharmaceutical industry, chiral technology has been widely applied to the development of new drugs in the fields of digestive diseases, cardiovascular diseases, and cancer.

Academician Li Can told reporters that in 1998 they successfully developed China's first ultraviolet Raman spectrometer with independent intellectual property rights, which solved the long-standing fluorescence interference problem in the field of international Raman spectroscopy, and applied it to catalysis at the earliest time in the world. Material science research. By 2004, the research team successfully developed the ultraviolet-visible full-band resonance Raman spectroscopy, which made China's catalytic characterization research in Raman spectroscopy ahead of the world. In 2008, the research team and Zhuo Li Hanguang Instrument Co., Ltd. began to industrialize the UV Raman spectrometer. In 2010, it completed the development of a deep-UV Raman spectrometer for a major national equipment development project, and obtained the world's first deep ultraviolet Raman spectrum with an excitation wavelength as low as 177 nm.

Academician Li Can proudly told reporters that in the past 10 years, UV Raman spectroscopy has shown tremendous advantages in many fields such as chemistry, physics and life sciences, becoming an important molecular spectroscopy technology. The leading position of UV Raman spectroscopy research in China has greatly promoted China's international cooperation research in this field. Dahua Institute has achieved technical cooperation with more than ten domestic and foreign research institutions. In the future, the promotion and application of UV Raman spectrometer technology in a number of research institutes will surely promote the healthy and rapid development of seven strategic emerging industries such as new energy, energy conservation and environmental protection, electric vehicles, and new materials in China, and will certainly allow more new ones. Materials, fine chemical industry benefit.